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Part Name(s) : BA9741F BA9741FS BA9743AFV BA9743AFV-E BA9744FV ROHM
ROHM Semiconductor
Description : Dual-output Step-up, Negative Voltage, Step-down Switching Regulators (Controller type) View
Part Name(s) : LTC1876 LTC1876EG Linear
Linear Technology
Description : High Efficiency, 2-Phase, Dual Synchronous Step-down Switching Controller and Step-Up Regulator View


The LTC®1876 is a high performance triple output Switching regulator. It incorporates a dual Step-down Switching Controller that drives all N-channelsynchronous power MOSFET stages. A step-up regulator with an internal 1A, 36V switch provides the third output.


Step-down Controller

■ Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise

■ Power Good Output Voltage Indicator

■ OPTI-LOOPTM Compensation Minimizes COUT

■ DC Programmed Fixed Frequency 150kHz to 300kHz

■ Wide VIN Range: 3.5V to 36V Operation

■ Very Low Dropout Operation: 99% Duty Cycle

■ Adjustable Soft-Start Current Ramping

■ Latched Short-Circuit Shutdown with Defeat Option

■ Remote Output Voltage Sense and OV Protection

■ 5V and 3.3V Standby Regulators

■ Selectable Const. Freq. or Burst ModeTM Operation

Step-Up Regulator

■ High Operating Switching Frequency of 1.2MHz

■ Low Internal VCESAT Switch: 400mV @ 1A, VIN = 3V

■ Wide VIN Range: 2.6V to 16V Operation

■ High Output Voltage: Up to 34V


■ 3.3V Input Step-down Converter

■ Notebook and Palmtop Computers, PDAs

■ Battery-Operated Digital Devices


Part Name(s) : BD9011EKN BD9011KV BD9011KV-E2 BD9775FV BD9775FV-E2 BD9011 BD9775 ROHM
ROHM Semiconductor
Description : Dual-output, high Voltage, high-efficiency Step-down Switching Regulator (Controller type) View

● Overview

The BD9011EKN/KV is a 2-ch synchronous Controller with rectification Switching for enhanced power management efficiency.

It supports a wide input range, enabling low power consumption ecodesign for an array of electronics.

● Features

1) Wide input voltage range: 3.9V to 30V

2) Precision voltage references: 0.8V± 1%

3) FET direct drive

4) Rectification Switching for increased efficiency

5) Variable frequency: 250k to 550kHz (external synchronization to 550kHz)

6) Built-in selected OFF latch and auto remove over current protection

7) Built-in independent power up/power down sequencing control

8) Make various application , Step-down , step-up and step-up-down

9) Small footprint packages: HQFN36V, VQFP48C

● Applications

  Car audio and navigation systems, CRTTV, LCDTV, PDPTV, STB, DVD, and PC systems, portable CD and DVD players, etc.


Part Name(s) : BD8305MUV BD8305MUV-E2 ROHM
ROHM Semiconductor
Description : High-efficiency Step-up/down Switching Regulators with Built-in Power MOSFET View

ROHM’s highly-efficient step-up/down Switching regulator BD8305MUV produces step-up/down output including 3.3 V from 1 cell of lithium battery with just one coil.This IC adopts an original step-up/down drive system and creates a higher efficient power supply than conventional Sepic-system or H-bridge system Switching Regulators.

1) Highly-efficient step-up/down DC/DC converter to be constructed just with one inductor.
2) Input voltage 2.5 V - 5.5 V
3) Output current 1 A at 3.3 V 800 mA at 5.0 V
4) Incorporates soft-start function.
5) Incorporates timer latch system short protecting function.
6) High heat radiation surface mounted package VQFN020V4040

    General portable equipment like portable audio or DSC/DVC

Part Name(s) : MB3827PFV MB3827 Fujitsu
Description : 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and Step-down View

The MB3827 is a pulse width modulation (PWM) type 6-channel DC/DC converter IC with, synchronous rectification for voltage step-up and Step-down. The MB3827 is ideal for low Voltage, high efficiency, compact applications and for down conversion and up/down conversion (with two types of voltage step-up/Step-down methods allowing input/output relations to be set independently).
In addition the MB3827 features a built-in self-supply power channel (channel 7) providing a wide range of supply voltages, and operates from two dry-cell batteries.
This product is ideal for high performance portable devices such as digital still cameras.

• Compatible with step-up/Step-down Switching methods (channel 1)
• Compatible with step-up/Step-down Zeta methods (channels 2 to 6)
• Synchronous rectification (channels 1 and 2)
• Low start-up voltage : 1.8 V (channel 7 for self-power supply)
• Power supply voltage range : 4 V to 13 V (channels 1 to 6)
• Built-in high-precision reference voltage generator : 2.5 V±1%
• Oscillator frequency range : 100 kHz to 800 kHz
• Error amplifier output for soft start (channels 1 to 6)

Part Name(s) : LM2574N-005 LM2574N-012 LM2574N-015 LM2574N-03.3 ON-Semiconductor
ON Semiconductor
Description : 0.5 A, Adjustable Output Voltage, Step-down Switching Regulator View

The LM2574 series of Regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step–down Switching regulator (buck converter). All circuits of this series are capable of driving a 0.5 A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version.

These Regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2574 are offered by several different inductor manufacturers.

Since the LM2574 converter is a switch–mode power supply, its efficiency is significantly higher in comparison with popular three–terminal linear Regulators, especially with higher input voltages.

In most cases, the power dissipated by the LM2574 regulator is so low, that the copper traces on the printed circuit board are normally the only heatsink needed and no additional heatsinking is required.


• 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions

• Adjustable Version Output Voltage Range, 1.23 to 37 V ±4% max over Line and Load Conditions

• Guaranteed 0.5 A Output Current

• Wide Input Voltage Range: 4.75 to 40 V

• Requires Only 4 External Components

• 52 kHz Fixed Frequency Internal Oscillator

• TTL Shutdown Capability, Low Power Standby Mode

• High Efficiency

• Uses Readily Available Standard Inductors

• Thermal Shutdown and Current Limit Protection


• Simple and High–Efficiency Step–Down (Buck) Regulators

• Efficient Pre–regulator for Linear Regulators

• On–Card Switching Regulators

• Positive to Negative Converters (Buck–Boost)

Negative Step–Up Converters

• Power Supply for Battery Chargers


Part Name(s) : TPS51120 TPS51120RHBR TPS51120RHBT TPS51120RHBTG4 TI
Texas Instruments
Description : Dual, Synchronous Step-down Controller With 100-mA Standby Regulators for Notebook System Power View

The TPS51120 is a highly sophisticated dual,synchronous Step-down Controller. It is a full featured
Controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system. High-current, 100-mA, 5-V or 3.3-V on-board linear Regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5-V UVP. No Negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN.
The TPS51120 32-pin QFN package is specified from –40°C to 85°C ambient temperature.

• 3.3-V and 5-V 100-mA Bootstrapped Standby
   Regulators with Independent Enables
• Selectable D-CAP™ Mode Enables Fast
   Transient Response Less than 100 ns
• Selectable Low Ripple Current Mode
• Less than 1% Internal Reference Accuracy
• Selectable PWM-only/Auto-skip Modes
• Low-side RDS(on) Loss-less Current Sensing
• RSENSE Accurate Current Sense Option
• Internal Soft-Start and Integrated VOUT Discharge
• Integrated 2-V Reference
• Adaptive Gate Drivers with Integrated Boost Diode
• Powergood for Each Channel with Delay Timer
• Fault Disable Mode
• Supply Input Voltage Range: 4.5 V to 28 V

   Notebook Computers System Bus and I/O

Part Name(s) : MAX17085B MAX17085BETL MaximIC
Maxim Integrated
Description : Integrated Charger, Dual Main Step-down Controllers, and Dual LDO Regulators View

General Description
The MAX17085B is an all-in-one notebook power solution integrating a multichemistry battery charger, dual fixed output Quick-PWMK Step-down Controllers, and dual keep-alive linear Regulators:

● All-in-One Charger Plus Dual Main Step-down Controllers
● 5V/100mA and 3.3V/50mA LDO Regulators
● Main
    Dual Quick-PWM with Fast Transient Response
    and Extended On-Time
    300kHz to 800kHz Switching Frequency
    Fixed 5V and 3.3V SMPS Outputs
    Low-Noise Ultrasonic Mode
    Autoretry Fault Protection
● Charger
    High Switching Frequency (1.4MHz)
    Selectable 2-, 3-, and 4-Cell Battery Voltage
    Automatic Selection of System Power Source
    Internal Charge-Pump for Adapter n-Channel MOSFETs Drive
    Q0.4% Accurate Charge Voltage
    Q2.5% Accurate Input Current Limiting
    Q3% Accurate Charge Current
● Monitor Outputs for
    AC Adapter Current (Q2% Accuracy)
    Battery Discharge Current (Q2% Accuracy)
    AC Adapter OK
● Analog/PWM (100Hz to 500kHz) Adjustable Charge Current Setting
● AC Adapter Overvoltage and Overcurrent rotection

Part Name(s) : MAX8529 MAX8529EEG MaximIC
Maxim Integrated
Description : 1.5MHz Dual 180° Out-of-Phase PWM Step-down Controller with POR View

General Description
The MAX8529 dual, synchronized, Step-down Controller generates two outputs from input supplies ranging from 4.75V to 23V. Each output is adjustable from sub-1V to 18V. Input voltage ripple and total RMS input ripple current are reduced by synchronized 180-degree out-ofphase operation.

♦ Low Output Noise in DSL Band
♦ Ceramic Input/Output Capacitors
Step-down or Step-Up/Step-down Operation
♦ Four Output, 90-Degree Out-of-Phase Operation (Using Two MAX8529s)
♦ Foldback Current Limit
♦ 4.75V to 23V Input Supply Range
♦ 0 to 18V Output Voltage Range (Up to 6A)
♦ > 90% Efficiency
♦ Fixed-Frequency PWM Operation
♦ Adjustable 600kHz to 1.5MHz Switching Frequency
♦ External SYNC Input
♦ Clock Output for Master/Slave Synchronization
♦ Soft-Start and Soft-Stop
♦ RST Output with 140ms Minimum Delay
♦ Lossless Current Limit (No Sense Resistor)

    xDSL Modems and Routers
    DSP, ASIC, and FPGA Power Supplies
    Set-Top Boxes
    Broadband Routers

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