Step Down Switching Regulator  
High Voltage Step-Down Switching Regulator
Part No. Features VIN(Range)(V) VFB(V) IQ(mA) ISTBY(uA) Package
IOUT(A) η()
P1593* 1.0A 200KHz, PWM Step-down Switching Regulator with Soft start 4.5V~26V 0.75V 3.5mA 2uA SOT-25 SOP-8
1.2A Up to 85%
P1595 1.5A 200KHz, PWM Step-down Switching Regulator

* Output Voltage In Adjustable Output Version.
* Short Circuit Protect
* On/Off Shutdown Control Input.
* Voltage Mode Non-Synchronous Pulse Width Modulation (PWM)
Control.
4.5V~24V 0.75V 4.0mA 2uA SOT-89-5
1.5A Up to 85%
P1596 1.5A 150KHz, PWM Step-down Switching Regulator

* Voltage mode non-synchronous PWM control
* Thermal-shutdown and current-limit protection
* Low power standby mode
* Internal current and thermal limit
* Built-in switching transistor on chip
4.5V~22V 1.23V(Adj)
2.5V,3.3V,
5.0V,12.0V(Fixed)
5.0mA 70uA TO-220B TO-220-5 TO-263-5 HSOP-8
1.5A Up to 90%
P1586* 1.5A 1.25MHz, PWM Step-down Switching Regulator 3V~25V 1.2V 1.0mA 6uA HSOP-8  MSOP-8
1.5A Up to 90%
P3576 2.0A 50KHz, PWM Step-down Switching Regulator

* Low power standby mode
* Internal current and thermal limit
* Built-in Switching Transistor On Chip.
4.5V to 40V 1.23V(Adj)
1.5V,3.3V,
5.0V,12V(Fixed)
4.0mA 100uA SOP-8
2.0A Up to 90%
P1690 0.4A 150KHz, PWM Step-down Switching Regulator

* High efficiency up to 85%
* Maximum Duty Cycle 100%
* Built in OTP
* Built in SCP
* Built in OCP
5V~65V 1.25V 5mA 200uA SOP-8
0.4A Up to 85%
P1696 2.0A 200KHz, PWM Step-down Switching Regulator

*Low power standby mode
*Internal OCP and OTP
4.5V~24V 1.23V(Adj)
2.5V,3.3V,
5.0V,12.0V(Fixed)
5.0mA 80uA SOP-8  HSOP-8 
2.0A Up to 90%
P1785 2.0A 300KHz, PWM Step-down Switching Regulator
With Internal OCSET

* Soft-start, Current Limit, Enable function
* Thermal Shutdown function
* Built-in internal SW P-channel MOS
* Duty ratio: 0% to 100% PWM control
3.6V~23V 0.8V - 10uA SOP-8
2.0A Up to 95%
P1885 2.0A 300KHz, PWM Step-down Switching Regulator

* Soft-start, Current Limit, Enable function
* Thermal Shutdown function
* Built-in internal SW P-channel MOS
* Duty ratio: 0% to 100% PWM control
3.6V~23V 0.8V - 10uA SOP-8
2.0A Up to 95%
LD1596 2.0A 150kHz, 40V Buck DC/DC Converter With Constant Current Loop

* Minimum Drop Out 1.5V
* Internal Optimize Power Transistor
* Excellent line and load regulation
* TTL shutdown capability
* ON/OFF pin with hysteresis function
4.5V~40V 1.235V 5.0mA 200uA SOP-8  HSOP-8 
2.0A Up to 83%
UC34463 2.0A 200KHz, PWM Buck Switching Regulator

* Voltage mode non-synchronous PWM control
* Thermal-shutdown and current-limit protection
* ON/OFF shutdown control input
* Low power standby mode
* Built-in switching transistor on chip
 Up to 40V 5.0V 5.0mA 70uA SOP-8  HSOP-8 
2.0A Up to 85%
UC34363 2.0A 75KHz, PWM  Switching Regulator

* CV/CC linear charge
* PWM control Mode
* Available charge current
* Over Voltage protect ,Over Current Protect
* Enable Control function
* Very Low Power Dissipation in Standby Mode
 8.0V to 30V 3.0V  - 7mA SOP-8
3.0A Up to 90%
P1580 2.5A 380KHz, PWM Step-down Switching Regulator

* Frequency Feedback at Short Circuit
* Thermal Shutdown
* Under Voltage Lock Output
* Current Mode With Low ESR Output Ceramic Capacitors
* Up to 90% Efficiency
3.5V~28V 1.222V 1.7mA 5uA HSOP-8
2.5A Up to 90%
P1583 2.5A 380KHz, PWM Step-down Switching Regulator

* Frequency foldback at short circuit
* Thermal shutdown
* Under voltage lock output
* Current mode with low ESR output ceramic capacitors
* Up to 90% efficiency
4V~24V 1.222V 2mA 36uA HSOP-8
2.5A Up to 90%
P34563 PWM CONTROL 3A STEP-DOWN CONVERTER

* Oscillation frequency: 100KHz
* Duty ratio: 0%~100% PWM control
* Enable and auto restart function.
* Short Circuit Protect (SCP).
* Thermal Shutdown function / Internal OVP.
* Built-in internal SW P-channel MOS.
8.0V~40V 1.10V(typ) 7.0mA 5uA HSOP-8
3.0A  
P1786 3,0A 300KHz, PWM Step-down Switching Regulator
With external OCSET

* Duty ratio: 0% to 100% PWM control
* Soft-start, current limit, enable function
* Thermal shutdown function
* Built-in internal SW P-channel MOS
4.0V~23V 0.8V - 10uA SOP-8 
3.0A Up to 95%
P1886 3,0A 300KHz, PWM Step-down Switching Regulator
Internal Frequency Compensation With Fewer Component Count

* Soft-start, Current Limit, Enable function
* Thermal Shutdown function
* Built-in internal SW P-channel MOS
* Duty ratio: 0% to 100% PWM control
4.0V~23V 0.8V - 10uA SOP-8 HSOP-8
3.0A Up to 95%
P1888 3,0A 300KHz, PWM Step-down Switching Regulator

* Soft-start, Current Limit, Enable function
* Thermal Shutdown function
* Built-in internal SW P-channel MOS
* Duty ratio: 0% to 100% PWM control
4.0V~23V 1.28V - 10uA SOP-8
3.0A Up to 88%
P1986 3.0A 330KHz, PWM Step-down Switching Regulator
Built-In Soft Start With Fewer Component Count

* Duty ratio varies from 0% to 100% PWM control
* Built-in switch P-channel power MOS
* Halogen Free
3.6~28V 0.8V 3.0mA 2uA SOP-8 
3.0A Up to 95%
P2576 3.0A 52KHz, PWM Step-down Switching Regulator

* Requires 4 External Components
* TTL Shutdown
* Low Power Standby Mode
* Thermal Shutdown,
* Current Limit Protection
7.0V~40V 1.23V(Adj)
5.0V(Fixed)
5.0mA 50uA SOP-8  HSOP-8 TO-220B 
TO-220-5 TO-263-5
3.0A Up to 85%
P2576HV* - - - - - -
- -
P2583 3.0A 380KHz, PWM Step-down Switching Regulator

* Frequency FoldBack at Short Circuit
* Thermal Shutdown
* Under Voltage Lock Output
* Current Mode with Low ESR Output Ceramic Capacitors
* Up to 90% Efficiency
3.6V~28V 1.222V 2.2mA 20uA SOP-8
3.0A Up to 90%
P3586 3.0A 1.2MHz , PWM Step-down Switching Regulator

* 10μA Shutdown Supply Current
* Frequency fold back at Short Circuit
* Protection Circuits: UVLO, Thermal Shutdown, OCP
*Low ESR Output Capacitor Application.
 3.6V to 20V 0.8V 3.0mA 10uA SOP-8
3.0A Up to 92%
P3596 3.0A 150KHz, PWM Step-down Switching Regulator

*Low power standby mode
*High efficiency
*Internal current and thermal limit
4.5V~35V 1.23V(Adj)
2.5V,3.3V,
5.0V,12.0V(Fixed)
5.0mA 80uA TO-220-5 TO-220B TO-263-5
3.0A Up to 85%
P4596 3.0A 200KHz, PWM Control  Step-Down Converter

* Duty ratio0%~100% PWM control
* Enable with Soft-Start function
* Oscillation frequency can be set by outside resistance
* Current Limit, SCP and OTP
8.0V~40V 0.815V 3.0mA 56uA HSOP-8
3A Up to 91%
LD4040* 4.0A 300KHz, 32V Buck DC to DC Converter 3.6V to 32V 0.8V 5.0mA 200uA TO-252-5
4.0A Up to 90%
P4590* 4.0A 380kHz, Asynchronous Step-Down Converter  4.5V~26V Up to 91% 2.0mA 5uA HSOP-8
4.0A
UMC33167 5.0A 72kHz, STEP-UP/DOWN/INVERTING SWITCHING REGULATORS

* Precision 2% Reference
* 0% ~ 95% Output Duty Cycle
* Cycle-by-Cycle Current Limiting
* Undervoltage Lockout with Hysteresis
* Internal Thermal Shutdown
7.5V~40V Up to 95% - 100uA TO220-5 TO-220B
5.0A
UD24121 1.4MHz, 1.2A STEP-DOWN CONVERTER

* 0.35Ω Internal Power MOSFET Switch
* Stable with Low ESR Output Ceramic Capacitors
* Up to 92% Efficiency
* 0.1μA Shutdown Mode
* Thermal Shutdown
* Cycle-by-Cycle Over Current Protection
4.5V~24V Up to 92% 0.8mA 3uA SOT-26
1.2A
UD36061 2MHz, 0.6A STEP-DOWN CONVERTER

* > 90% Efficiency
* Internally Compensated
* Internal Soft-Start
* Precision Current Limit Without Current Sensing Resistor
* 3μA Low Shutdown Supply Current
3.6V~36V Up to 90% 0.13mA 3uA SOT-26
0.6A
UD36241 * CC/CV Mode Control
* Adjustable Load Line Compensation
* 200mΩ Internal Power MOSFET Switch
* Current Mode Control
* Fixed Frequency Operation : 100kHz
* Programmable Output Current Limit
* Lowe EMI signature
* Cycle-by-Cycle Over Current Protection
* Input Under Voltage Lockout
* with OTP
9V~36V 1V 4 3uA HSOP-8
2.4A -
*: Under  Development
Synchronous Step-Down DC-DC Converter (Buck)  
Part No. Features VIN(Range)(V) η() IQ(uA) ISTBY(uA) Package
IOUT(A)
UC3655-XX 1.3MHz 0.5A Synchronous Buck  Converter

* Very High Efficiency 92%
* Low Ripple Rejection Voltage 10mV
* With PWM / PFM Automatic Switching Control
* Maximum Duty Ratio is 100%
* Ceramic Capacitor Available
2V~6V 90% 70uA 1.0uA SOT-25
0.5A
UC3206 3MHz 0.6A Inductor Built-in Step-Down “micro DC/DC” Converters

* Maximum duty cycle: 100%
* High efficiency : 92% (TYP.)
* High speed soft-start circuit and Current limiter circuit built-in
* CL high speed auto discharge
* Low ESR ceramic capacitor compatible
2V~6V 85% 35uA 1.0uA SOT-25
0.6A
UC3656 1.6MHz, 1.0A High Efficiency Step-Down DC/DC Converter

* Schottky Diode is Saved
* Internal ON/OFF
* 100% Duty Cycle Allows Low Dropout Operation
* Stand-by Current: 1μA (Max.)
2.5V~5.5V 90% 300uA 0.5uA SOT-25
1.0A
UC3666 1.6MHz, Dual Channel 1A High Efficiency Step-Down DC/DC Converter

* Current mode operation
* Fixed frequency operation
* Over-temperature protection circuit
* RoHS Compliant (100% green available)
2.5V~5.5V 90%  - 0.1uA DFN3030-10
0.8A
UC3657* 1.2MHz , 1.2A Synchronous Buck  Converter 2.5V~5.5V Up to 95% 300uA 0.5uA TDFN-10(3x3) SOP-8 TSSOP-8
1.2A
P1482 340KHz, 2.0A Synchronous Rectified Step-Down Converter

* Integrated Power MOSFET Switches
* Programmable Soft-Start
* Stable with Low ESR Ceramic Output Capacitors
* Cycle-by-Cycle Over Current Protection
6V~23V Up to 93% 5000uA  - SOP-8
2.0A
P1482A 340KHz, 2.0A Synchronous Rectified Step-Down Converter

* Integrated Power MOSFET Switches
* Programmable Soft-Start
* Stable with Low ESR Ceramic Output Capacitors
* Cycle-by-Cycle Over Current Protection
6V~23V Up to 93% 5000uA  - HSOP-8
2.0A
P2520* 2.0A 340kHz, 20V Step Down Converter 7.0V~20V 1.293V 700uA 8uA HSOP-8  
2.0A Up to 95%
P2680 2.0A 340kHz, Step Down Converter

* Output Adjustable
* Frequency FoldBack at Short Circuit
* VIN Under-voltage Lockout
* Thermal Shutdown
* OCP
* Programmable Soft-Start
7.0V~26V 0.923V 900uA 8uA HSOP-8  
2.0A Up to 95%
SR2803 330KHz, 3.0A Synchronous Buck Regulator.

* Duty ratio varies from 0% to 92% PWM control
* Thermal shutdown and SCP function and soft-start, current limit,
enable function
* Low ESR output capacitor(Multi-layer chip capacitor) application
4.0V~28V Up to 95% 3000uA 2.0uA SOP-8
3.0A
P1484 340KHz, 3.0A Synchronous Rectified Step-Down Converter

* Integrated Power MOSFET Switches
* Programmable Soft-Start
* Stable with Low ESR Ceramic Output Capacitors
* Cycle-by-Cycle Over Current Protection
6.0V~23V Up to 93% 3500uA  - SOP-8
3.0A
P1484A 340KHz, 3.0A Synchronous Rectified Step-Down Converter

* Integrated Power MOSFET Switches
* Programmable Soft-Start
* Stable with Low ESR Ceramic Output Capacitors
* Cycle-by-Cycle Over Current Protection
6.0V~23V Up to 93% 3500uA  - HSOP-8
3.0A
UCD0318* 500KHz, 3.0A Synchronous Rectified Step-Down Converter 4.5V~16V Up to 95% 2000uA 1.0uA HSOP-8
3.0A
USR1021 500KHz, 3.0A PWM Control  Step-Down Converter

* Internal soft start
* 1.5% initial output accuracy
* Cycle-by-cycle current limit
* Thermal shutdown
* Short-circuit protection
4.5V~16V Up to 95% 3500uA 3.0uA SOP-8
3.0A
USR1051 400KHz, 3.0A PWM Control  Step-Down Converter with Soft start

* Synchronous Buck
* Cycle-by-cycle current limit
* Pre-bias start-up
* Thermal shutdown
* Short-circuit protection
4.5V~18V Up to 95% 1600uA 1.0uA HSOP-8
3.0A
UC3658* 1MHz, 3.0A Synchronous  Step-Down Regulator 3V~5.5V Up to 95% - 1.0uA HSOP-8
3.0A
UD05103 1.5MHz/1MHz, 1A HIGH-EFFICIENCY SYNCHRONOUS STEP-DOWN CONVERTER

* Shutdown Current < 1μA
* 100% Duty Cycle Operation
* Current Mode Operation
* Internal Soft-Start.
* Current Limit Protection
* Over-temperature Protection.
* Input Under Voltage Lockout (UVLO)
2.5V~5.5V Up to 95% 600uA 1.0uA SOT-25
1A
UD05104 2.25MHz, 1A SYNCHRONOUS STEP-DOWN DC/DC CONVERTER

* 100% Duty Cycle Operation
* Internal Soft-Start
* Cycle-by-Cycle Current Limit Protection
* Over-Load and Hiccup Mode Short Circuit
* Thermal Shutdown Protection
2.5V~6.0V - 40uA 1.5uA SOT-25
1A
UD05104A * +/-2% 0.6V Feedback Voltage Accuracy
* 1MHz Switching Frequency
* 100% Duty Cycle Operation
* Built-in 170mΩ/150mΩ Power Switch
* Cycle-by-Cycle Current Limit Protection
* with Soft-start, OTP, Over-Load and Hiccup Mode Short Circuit
2.5V~6.0V - 40uA 1.5uA SOT-25
1A
UD05121 1.5MHz, 1.2A Synchronous  Step-Down Regulator

* Up to 95% Efficiency
* Less than 1μA Shutdown Current
* Thermal Shutdown Protection
* Current limit and short circuit protections.
* Build-in soft start function
2.5V~5.5V Up to 95% 350uA 1.0uA SOT-25
1.2A
UD05151 1.5MHz, 1.5A HIGH-EFFICIENCY SYNCHRONOUS STEP-DOWN CONVERTER

* Shutdown Current < 1μA
* 100% Duty Cycle Operation
* Current Mode Operation
* Internal Soft-Start
* Current Limit Protection
* Over-temperature Protection
* Input Under Voltage Lockout (UVLO)
3.0V~5.5V Up to 90% 80uA 1.0uA SOT-25
1.5A
UD05158 1.5MHz, 1.5A LOW NIOSE SYNCHRONOUS STEP-DOWN CONVERTER

* Shutdown Current < 1μA
* 100% Duty Cycle Operation
* Current Mode Operation
* Internal Soft-Start.
* Current Limit Protection
* Over-temperature Protection.
* Input Under Voltage Lockout (UVLO)
2.7V~5.5V Up to 95% 200uA 1.0uA DFN2020-6
1.5A
UD05201 1.2MHz, 2A SYNCHRONOUS STEP-DOWN CONVERTER

* High Efficiency: Up to 96%
* Low RDS(ON) Internal Switches: 0.15Ω
* Current limit, Enable function
* Short Circuit Protect (SCP)
* Build-in Soft Start function
* 1μA Shutdown Current
2.6V~5.5V Up to 96% 400uA 1.0uA SOT-8
2A
UD05202 1MHz, 2A SYNCHRONOUS STEP-DOWN CONVERTER

* Low RDS(ON) for internal switches (top/bottom) 180mΩ/120mΩ
* Internal soft-start limits the inrush current
* 100% dropout operation
3V~5.5V - 80uA 10uA HSOP-8
2A
UD05203 1MHz, 2A SYNCHRONOUS STEP DOWN REGULATOR

* Low RDS(ON) for internal switches (top/bottom) 130mΩ/100mΩ
* Internal softstart limits the inrush current
* 100% dropout operation
3V~5.5V - 80uA 1uA HSOP-8
2A
UD05205 1.5MHz, 2A SYNCHRONOUS BUCK CONVERTER

* 150/120mΩ Internal Power MOSFET Switch
* Stable with Low ESR Output Ceramic Capacitors
* Up to 95% Efficiency
* Less than 1μA Shutdown Current
* Thermal Shutdown Protection
* Current limit and short circuit protections.
* Build-in soft start function
2.5V~5.5V Up to 95% 350uA 1uA SOT-25
2A
UD05206 1.5MHz, 2A SYNCHRONOUS STEP DOWN REGULATOR

* Shutdown Current < 1μA
* 100% Duty Cycle Operation
* Current Mode Operation
* Internal Soft-Start
* Current Limit Protection
* Over-temperature Protection
* Input Under Voltage Lockout (UVLO)
2.5V~5.5V Up to 100% 128uA 1uA HSOP-8
2A
UD05251 1.2MHz, 2.5A SYNCHRONOUS STEP DOWN REGULATOR

* High Efficiency: Up to 94%
* Current limit, Enable function
* Short Circuit Protect (SCP)
* Build-in Soft Start function
* 1μA Shutdown Current
2.6V~5.5V Up to 94% 400uA 1uA HSOP-8 DFN3030-8
2.5A
UD05302 1MHz, DUAL 3A SYNCHRONOUS STEP DOWN REGULATOR

* Low RDS(ON) for internal switches (top/bottom) 110mΩ/80mΩ
* Internal softstart limits the inrush current
* 100% dropout operation
3V~5.5V - 80uA 10uA HSOP-8
3A
UD05303 1MHz, 3A HIGH EFFICIENCY synchronous step-down DC-DC regulator

* Low RDS(ON) for internal switches (top/bottom) 100mΩ/70mΩ
* Internal softstart limits the inrush current
* 100% dropout operation
* Output power good indicator
* RoHS compliant and halogen free
3V~5.5V - - - HSOP-8
3A
UCC36351 160KHz, 3.5A SYNCHRONOUS BUCK CONVERTER WITH CC/CV

* Integrated 75/45mΩ Power MOSFET Switches
* Up to 93% Efficiency
* Stable with Low ESR Ceramic Output Capacitors
* Cycle-by-Cycle Over Current Protection
* Input Under/Over Voltage Lockout
8V~36V Up to 93% 1.5mA - HSOP-8
3.5A
UCC36451 160KHz, 4.5A SYNCHRONOUS BUCK CONVERTER WITH 2CH CC/CV

* Integrated 75mΩ high side Power MOSFET Switches
* Up to 95% Efficiency
* Stable with Low ESR Ceramic Output Capacitors
* Cycle-by-Cycle Over Current Protection
* Input Under/Over Voltage Lockout
8V~36V Up to 95% 2mA - HSOP-8
4.5A
UD38251 160KHz, 2.5A SYNCHRONOUS BUCK CONVERTER

* Integrated 140mΩ Power MOSFET Switches
* Up to 93% Efficiency
* Internal Soft-Start
* Cycle-by-Cycle Over Current Protection
* Input Under/Over Voltage Lockout
8V~38V Up to 93% 1.5mA 1.3mA HSOP-8
2.5A
UD38252 160KHz, 2.5A SYNCHRONOUS BUCK CONVERTER WITH CC/CV

* Integrated 140mΩ Power MOSFET Switches
* Up to 92% Efficiency
* Internal Soft-Start.
* Cycle-by-Cycle Over Current Protection
* Input Under/Over Voltage Lockout
8V~38V Up to 92% 1.5mA - HSOP-8
2.5A
UD38501 160KHz, 5A SYNCHRONOUS BUCK CONVERTER

* Integrated 80mΩ high side Power MOSFET Switches
* Up to 95% Efficiency
* Internal Soft-Start
* Cycle-by-Cycle Over Current Protection
* Input Under/Over Voltage Lockout
8V~38V Up to 95% 1.5mA 1.3mA HSOP-8
5A
UD18204 500KHz, 2A SYNCHRONOUS RECTIFIED STEP-DOWN DC/DC CONVERTER

* High Efficiency up to 90%
* Power Saving Mode (PSM) during the light Load Operation
* Current Mode Operation
* Over-temperature Protection
* Over-current Protection
4.5V~18V Up to 90% - - SOT-26
2A
*: Under  Development
Step-Down DC-DC PWM or PFM  Controller (Buck)  
Part No. Features VIN(Range)(V) η() IQ(uA) ISTBY(uA) Package
UC3750-XX 600kHz PWM /PFM Buck  Controller

* Built-in soft-start (SS)
* Automatic PWM/PFM switchover under light load condition
* Internal under-voltage lockout (UVLO) protection
* Low profile and minimum external components
2.45V~5.5V 92% 50uA(Typ) 0.3uA SOT-25
UC4601 500kHz PWM Step-down DC-DC Controller

* Internal soft-start and protection function
* High efficiency up to 90% (TYP.)
* Standly current: 0.1μA (TYP.)
* CMOS output capability
2.5~18V 90% 40uA(Typ) 1.0uA SOT-25
M7085 1MHz PFM STEP-DOWN Controller

* High efficiency 90% and up is possible
* Low dropout operation100% duty cycle
* Two methods of over-current protection
4.5V~35V 93% 300uA(Typ)  - MSOP-8
USR1101 5V/12V Synchronous Buck PWM DC-DC Controller

* Drives all low cost N-channel MOSFETs
* PWM control mode
* Internal soft-start
* RoHS compliant and 100% lead (Pb)-free
5V±5%,12V±10% 88% 6mA(Typ)  - SOP-8
*: Under  Development
 
6.  Step-Up DC-DC Converter and Controller  
Step-Up DC-DC Converter 
Part No. Features VIN(Range)(V) η() IO(mA) IQ(uA) Package
UC3506* 1V High Efficiency Synchronous Step-Up Converters  0.6V~5.5V Up to 92% 1000mA 18uA TSSOP-8
UC8383-XX 165KHz VFM Step-Up DC-DC Converters

* 0.8V Start-Up Voltage
* Output Voltage Accuracy ±2%
* Low Ripple and Low Noise
* High Efficiency Up to 85%
* Low Profile and Minimum External Components
0.8V ~ 5.5V Up to 85% Up to 100mA 18uA SOT-89
UC3383-XX PFM Controlled,Step-Up DC-DC Converters with Enable Function

* Highly Accurate: Set-up Voltage ±2.5%
* Variable Duty Ratio: 45%/75% (±5%)
* Both Switching Transistor Built-in and External Types are  vailable
0.9V ~ 10.0V Up to 85% Up to 50mA 5.3uA SOT-25 SOT-89
UC3382-XX* PWM/PFM Controlled,Step-Up DC-DC Converters and controller 0.9V~10.0V  85%(Typ) Up to 100mA 5uA SOT-25 SOT-89 SOT-89-5
UC3553-XX* High Efficiency Synchronous Step-Up DC-DC Converters
(Vout=1.8V~5.5V)
1.1V~5.5V Up to 92% Up to 300mA 20uA MSOP-8
UC2306-XX DC-DC Converters with Low-Battery Detector Active in Shutdown

*In shutdown mode:10μA quiescent current.
*Low battery detector active
*Only by one resistor: peak current is programmable.
1.5V ~ 8.0V Up to 85% 1000mA 120uA SOP-8 DIP-8
UC3555 500mA PFM Synchronous Step-Up DC-DC Converters and Controller

* Low power PFM step-up DC/DC
* internal synchronous rectifier
* Low battery detection
* Current limited protection
* Current Anti-Drawback protection
1.6V~4.5V  95%(Typ) Up to 500mA 80uA TSSOP-8
UC3551-XX 450KHz ADVANCED PWM STEP-UP DC-DC CONVERTER

* Low Start-up Input Voltage is as Low as 1.0V
* Efficiency up to 90%
* Zero Shutdown Mode Supply Current
* Both Internal and External Power Switches for Maximum Flexibility
2.0V~6.5V Up to 90% Up to 300mA 17uA SOT-26
UC3500-XX 150KHz Max VFM Step-Up DC-DC Converters (VO=2.5V~5V)

* 0.8V start-up voltage
* 0.5V hold-on voltage
* Low supply current of 18μA
* High efficiency up to 88%
* Low profile and minimum external components
0.7V~7.0V  88%(Typ) Up to 150mA 18uA SOT-25 SOT-23 SOT-89
P2172 100kHz, 1.25A High Efficiency Switching Regulators

* Very Few External Parts Required
* Self-Protected Against Overloads
* Operates in Nearly All Switching Topologies
* Flyback-Regulated Mode Has Fully Floating Outputs
* Can Be Externally Synchronized
3.0V~60.0V  80%(Typ) 1.25A 6mA DIP-8
UU28121 1.2MHz, 1.2A BOOST FOR WHITE LED DRIVER

* Internal Soft-start Function
* Current limit and Thermal shutdown protection
* Under voltage Lockout
2.5V~5.5V - 1.2A 250uA SOT-25
UU28141 1MHz, 1.4A BOOST FOR WHITE LED DRIVER

* Drives up to 8 series White LEDs
* Wide range for PWM dimming (200Hz~200KHz)
* Over Voltage Protection (OVP)
* Internal Soft-start Function
* Current limit and Thermal shutdown protection
* Under voltage Lockout
2.5V~5.5V - 1.4A 400uA SOT-26
*: Under  Development
Step-Up PWM DC-DC Controller  
Part No. Features VIN(Range)(V) η() IO(mA) IQ(uA) Package
UC3380 PWM/PFM Step -Up Switching Regulator Controller(VO=1.8V~5.0V)

* 0.5uA Low Shutdown Current
* Fix Frequency PWM at 300KHZ
* Built in PWM Switching Control Circuit ,Duty Ratio is 0~78%
* Soft Start Time: 3ms
* Shutdown Function
0.9V~10.0V 86% 80mA 0.5uA SOT-25
UC3550 300KHz PWM Step-Up DC-DC Controller(VO=3.3V~5.0V)

* Output Voltage Range1.8~6V Programmable in 0.1V with High
Accuracy ± 2.5%
* High Efficiency 88% (Typ.)
* Low Start-up Voltage of 0.9V Typical at IOUT = 1.0mA
* Chip Enable Pin with Pull-up Current Source
0.9V~8.0V 88% 150mA <200uA SOT-25
UC3552 PWM DC-DC CONVERTER WITH INTERNAL SWITCH AND SOFT-START

* 1.6A, 0.23Ω, internal switch
* High efficiency: 90%
* Adjustable frequency: 640kHz or 1.3MHz
* Low shutdown current: 0.1μA
* Programmable soft-start
2.6V~5.5V 90% 1600mA 1200uA MSOP-8 SOP-8
UC33063A DC TO DC CONVERTER CONTROLLER

* Short Circuit Current Limiting.
* Low Standby Current.
* Frequency of Operation from 100Hz to 100kHz.
* Step-up, Step-down or Inverting Switch Regulators.
3.0V~40V - 1500mA - DIP-8 SOP-8
UC34163 DC TO DC CONVERTER CONTROLLER

* Low standby current.
* Frequency of operation from 100Hz ~ 100kHz.
* Step-down switch regulators.
35V - 1500mA - DIP-8 SOP-8
UD06122 1.2A 1.5MHz dual high-efficiency(PWM) step-down DC-DC converter

* Stable with Low ESR Output Ceramic Capacitors
* Up to 95% Efficiency
* Less than 1μA Shutdown Current
* Thermal Shutdown Protection
* Current limit and short circuit protections.
* Build-in soft start function
2.5V~6.0V 95% 1200mA 350uA DFN3030-10
UD06123 1.2A 2.25MHz constant frequency current mode PWM step-down converter

* High Efficiency: Up to 92%
* 100% Duty Cycle in Dropout
* Current limit, Enable function
* Short Circuit Protect (SCP)
* 1μA Shutdown Current
2.5V~7.5V 92% 1200mA 90uA SOT-25
*: Under  Development
DC-DC Converter(Step-Down /Step-Up)  
Part No. Features VIN(Range)(V) η() ICC ISW(A) Package
PD(mW)
P4063 * MAX. 40V Input
* MAX. load to 1.5A
* Output Voltage Adjustable
* Frequency Operation of 150kHz
* Precision 1.5% Reference
0V~40.0V - 7.0mA 1.5A SOP-8
-
3563 High-Efficiency DC-DC Converter

* Bootstrapped driver.
* High side current sense capability.
* High efficiency (up to 90%)
* Internal ±2% reference.
* Frequency operation from 100Hz to 100KHz
3.0V~30.0V 90% 1.6mA 1.5A DIP-8  SOP-8
1000/625mW
MC34063A Variable Frequency DC-DC Converter Controller IC
for Step-Up or Step-Down Voltage Converter

* Short circuit current limiting.
* Low standby current.
* Frequency of operation from 100Hz to 100kHz.
* Step-up, step-down or inverting switch regulators.
3.0V~40.0V 88% 2.7mA 1.5A DIP-8  SOP-8 TSSOP-8
1250/625mW/300mW
MC33167* 5A DC-DC Converter with Standby Mode
Step-Up or Step-Down or Inverse
7.5V~40.0V 80% 40mA Op
36uA stby
5.0A TO-252-5 TO-263-5 TO-220-5
-
*: Under  Development