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Part Name(s) : MAX8834Y MAX8834YEWP+T MAX8834YEWP-T MAX8834Z MAX8834ZEWP+T MAX8834ZEWP-T MAX8834Y MAX8834YEWP+T MAX8834Z MAX8834ZEWP+T MaximIC
Maxim Integrated
Description : Adaptive Step-Up Converters with 1.5A Flash Driver View

General Description
The MAX8834Y/MAX8834Z Flash Drivers integrate a 1.5A PWM DC-DC Step-Up converter and three programmable low-side, low-dropout LED current regulators. The Step-Up converter features an internal switching MOSFET and synchronous rectifier to improve efficiency and minimize external component count. An I2C interface provides flexible control of stepup converter output voltage setting, movie/Flash mode selection, Flash timer duration settings, and current regulator settings. The MAX8834Y/MAX8834Z operate down to 2.5V, making them future proof for new battery technologies.

Features
♦ 2.5V to 5.5V Operation Range
Step-Up DC-DC Converter
    1.5A Guaranteed Output Current
    Adaptive or I2C Programmable Output Voltage
    2MHz and 4MHz Switching Frequency Options
♦ Two Flash/Movie LED Current Regulators
    I2C Programmable Flash and Movie Current
    Low-Dropout Voltage (110mV max) at 500mA
♦ LED Indicator Current Regulator
    I2C Programmable Output Current
    Ramp and Blink Timers for Indicator Mode
    Low-Dropout Voltage (130mV max) at 16mA
♦ I2C Programmable Safety and Watchdog Timers
♦ GSM Blank Logic Input
♦ MAXFlash System Lockup Protection
♦ Remote Temperature Sensor Input
♦ Open/Short LED Detection
♦ Thermal Shutdown Protection
♦ < 1µA Shutdown Current
♦ 20-Bump, 0.5mm Pitch, 2.5mm x 2.0mm WLP

Applications
    Cell Phones and Smart Phones
    PDAs, Digital Cameras, and Camcorders

Part Name(s) : LM3639A LM3639AYFQ LM3639AYFQR LM3639AYFQT TI
Texas Instruments
Description : Single Chip 40V Backlight + 1.5A Flash LED Driver View

DESCRIPTION
The LM3639A is a single-chip white LED Camera Flash Driver + LCD Display Backlight Driver. The low voltage, high-current Flash LED Driver is a synchronous boost which provides the power for a single Flash LED at up to 1.5A or dual LEDs at up to 750 mA each. The high-voltage backlight Driver is a dual-output asynchronous boost which powers dual LED strings at up to 40V and 30 mA per string. An Adaptive regulation method in both boost Converters regulates the headroom voltage across the respective source/sink to ensure the LED current remains in regulation while maximizing efficiency. The LM3639As Flash Driver is a 2MHz or 4MHz fixed- frequency synchronous boost converter plus 1.5A constant current Driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing Flash current up to 1.5A. An Adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
The device is controlled by an I2C-compatible interface. Features for the Flash LED Driver include a hardware Flash enable (STROBE) allowing a logic input to trigger the Flash pulse, and a TX input for synchronization to RF power amplifier events or other high current conditions. Features for the LCD backlight Driver include a PWM input for content adjustable backlight control, 128 exponential or linear brightness levels, programmable over-voltage protection, and selectable switching frequency (500 kHz or 1 MHz).
The device is available in a tiny 1.790 mm x 2.165 mm x 0.6 mm 20-bump, 0.4 mm pitch DSBGA package and operates over the −40°C to +85°C temperature range.

FEATURES
• Single Chip White LED Flash and Backlight
   Driver
1.5A Flash LED Current
• Dual String Backlight Control (40V Max VOUT)
• 128 Level Exponential and Linear Brightness
   Control
• PWM Input for CABC
• Programmable Over-Voltage Protection
   (Backlight)
• Programmable Current Limit (Flash)
• Programmable Switching Frequency
• Optimized Flash Current During Low-Battery
   Conditions

APPLICATIONS
• White LED Backlit Display Power
• White LED Camera Flash Power

Part Name(s) : MAX1687ESA MAX1687EUE MAX1688ESA MAX1688EUE MAX1687 MAX1688 MaximIC
Maxim Integrated
Description : Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM View

General Description
The MAX1687/MAX1688 Step-Up DC-DC Converters deliver up to 2W from a single Li-Ion or three NiMH cells. The devices are ideal for burst-load applications such as GSM cell phones and wireless LANs, where the RF power amplifiers require short, high current bursts. The MAX1687/MAX1688 reduce battery surge current by slow ly charging a reservoir capacitor, which supplies the necessary peak energy for the load current burst. As a result, the peak battery current is limited, thus maximizing battery life and minimizing battery voltage sag and transient dips.
An internal synchronous rectifier provides over 90% conversion efficiency and eliminates the need for an external Schottky diode. A logic shutdown mode reduces the shutdown current to only 3µA. The devices can be disabled during current bursts (RF transmit mode) to eliminate
switching noise. The switching frequency of the MAX1687/MAX1688, controlled by the selected inductor, can exceed 1MHz. Two external resistors set the output voltage from 1.25V to 6V. The MAX1687 controls peak battery current, while the MAX1688 features a more advanced, Adaptive constant recharge-time algorithm that maximizes battery life. The MAX1687/MAX1688 are available in thin 16-pin TSSOP (1.1mm max height) or standard 8-pin SO packages.

Features
♦ Low 450mA Peak Battery Current
   Provides 2A, 5V GSM Burst
♦ 90% Efficiency
♦ Internal Power MOSFETs and Current-Sense Resistor
♦ Output Disconnects from Input During Shutdown
♦ 3µA Shutdown Current
♦ Precise Voltage-Controlled Current Limit (MAX1687)
Adaptive Constant-Recharge-Time Capability (MAX1688)
♦ 1.25V to 6V Adjustable Output
♦ 2.7V to 6V Input Range
   (1 Li-Ion cell or 3 NiMH cells)
♦ Switching Frequency Can Exceed 1MHz
♦ Standby Mode Disables DC-DC During Transmission Burst
♦ Low Inrush Current at Start-Up

Applications
   GSM Phones
   Wireless Handsets
   PC Cards (PCMCIA)

Part Name(s) : MAX5082 MAX5083 MAX5082ATE MAX5083ATE MaximIC
Maxim Integrated
Description : 1.5A, 40V, MAXPower Step-Down DC-DC Converters View

General Description
The MAX5082/MAX5083 are 250kHz PWM step-down DC-DC Converters with an on-chip, 0.3Ω high-side switch. The input voltage range is 4.5V to 40V for the MAX5082 and 7.5V to 40V for the MAX5083. The output is adjustable from 1.23V to 32V and can deliver up to 1.5A of load current.

Features
♦ 4.5V to 40V (MAX5082) or 7.5V to 40V (MAX5083) Input Voltage Range
1.5A Output Current
♦ VOUT Range From 1.23V to 32V
♦ Internal High-Side Switch
♦ Fixed 250kHz Internal Oscillator
♦ Automatic Switchover to Pulse-Skip Mode at Light Loads
♦ External Frequency Synchronization
♦ Thermal Shutdown and Short-Circuit Protection
♦ Operates Over the -40°C to +125°C Temperature Range
♦ Space-Saving (5mm x 5mm) High-Power 16-Pin TQFN Package


Part Name(s) : RT8012A RT8012APQW RT8012AGQW Richtek
Richtek Technology
Description : Dual 1A/1.5A-1.2MHz Synchronous Step-Down Converters View

General Description
The RT8012A is a dual PWM, current mode, stepdown converter. Its input voltage range is from 2.6V to 5.5V and has a constant 1.2MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Each output voltage is adjustable from 0.8V to 5V. Internal power switches with low on-resistance of the dual step-down regulators increase efficiency and eliminate the need for external Schottky diodes.

Features
● High Efficiency : Up to 95%
● 1.2MHZ Constant Switching Frequency
● 1A and 1.5A Load Current on Each Channel Respectively
● Low RDS(ON) Internal Switches
● No Schottky Diode Required
● 0.8V Reference Allows Low Output Voltage
● Low Dropout Operation : 100% Duty Cycle
● Internally Compensated
● < 2μA Shutdown Current
● Power Good Output Voltage Monitor
● Internal Soft-Start
● Easy Power Sequence Control
● Over temperature Protection
● Short Circuit Protection
● Thermally Enhanced 16-Lead WQFN Package
● RoHS Compliant and 100% Lead (Pb)-Free

Applications
● Portable Instruments
● Microprocessors and DSP Core Supplies
● Cellular Phones
● Wireless and DSL Modems
● PC Cards
● Digital Cameras

Part Name(s) : L5971 L5971D ST-Microelectronics
STMicroelectronics
Description : 1.5A STEP DOWN SWITCHING REGULATOR View

DESCRIPTION
The L5971 is a step down monolithic power switching regulator delivering 1.5A at a voltage between 1.26V and 20V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.

■ UP TO 1.5A STEP DOWN CONVERTER
■ OPERATING INPUT VOLTAGE FROM 6.5V TO 28V
■ PRECISE 1.26V (±1%) INTERNAL REFERENCE VOLTAGE
■ OUTPUT VOLTAGE ADJUSTABLE FROM 1.26V TO 20V
■ SWITCHING FREQUENCY ADJUSTABLE UP TO 500KHz
■ VOLTAGE FEEDFORWARD
■ ZERO LOAD CURRENT OPERATION
■ INTERNAL CURRENT LIMITING (PULSE-BY-PULSE AND HICCUP MODE)
■ INHIBIT FOR ZERO CURRENT CONSUMPTION
■ PROTECTION AGAINST FEEDBACK DISCONNECTION
■ THERMAL SHUTDOWN
■ SOFT START FUNCTION

Part Name(s) : BD9207FPS BD9207FPS-E2 ROHM
ROHM Semiconductor
Description : LED Driver series for lighting Step-down type with 1.5A output View

●Description

BD9207FPS is a LED Driver with built-in step-down switching regulator and incorporates the built-in switching MOS EFT of Pch. Feedback voltage is as low as 0.2V and can suppress the loss on the sense resistance of LED.

It is operated by PWM method with an oscillating frequency of 900 KHz and can use smaller coil than a switching regulator of low-frequency operation.



●Features

 1)  Maximum switching current of 1.5A

 2)  Built-in Pch switching MOS FET for high efficiency

 3)  Low loss because feedback voltage is as low as 0.2V

 4)  High oscillating frequency of 900KHz   (Fixed)

 5)  Built-in soft start function

 6)  Built-in overcurrent protection circuit (OCP)

 7)  Built-in thermal shutdown circuit (TSD)

 8)  ON/OFF of output is possible by STBY terminal.

 9)  Compact surface-mount TO252S-5 package



●Applications

・For use in the light sources of PPC

・Printer etc. and the LCD backlights ofLED lighting apparatus & monitor

・Note PC etc.


Part Name(s) : MAX724 MAX726 MAX724CCK MAX724ECK MAX726CCK MAX726ECK MaximIC
Maxim Integrated
Description : 5A/2A Step-Down, PWM, Switch-Mode DC-DC Regulators View

General Description
The MAX724/MAX726 are monolithic, bipolar, pulsewidth modulation (PWM), switch-mode DC-DC regulators optimized for step-down applications. The MAX724 is rated at 5A, and the MAX726 at 2A. Few external components are needed for standard operation because the power switch, oscillator, and control circuitry are all on-chip. Employing a classic buck topology, these regulators perform high-current stepdown functions, but can also be configured as inverters, negative boost Converters, or flyback Converters.

Features
♦ Input Range: Up to 40V
♦ 5A On-Chip Power Switch (MAX724) 2A On-Chip Power Switch (MAX726)
♦ Adjustable Output: 2.5V to 35V
♦ 100kHz Switching Frequency
♦ Excellent Dynamic Characteristics
♦ Few External Components
♦ 8.5mA Quiescent Current
♦ TO-220 Package

Applications
    Distributed Power from High-Voltage Buses
    High-Current, High-Voltage Step-Down Applications
    High-Current Inverter
    Negative Boost Converter
    Multiple-Output Buck Converter
    Isolated DC-DC Conversion

Part Name(s) : ACT6390 ACT6391 ACT6390MH-T ACT6391MH-T ACT6390 ACT6391 ACT6390MH-T ACT6391MH-T ACT6390 ACT6391 ACTIVE-SEMI
Active-Semi, Inc
Description : 1.7A/2.5A PWM Step-Up DC/DC Converters In MSOP View

GENERAL DESCRIPTION
The ACT6390/ACT6391 are high-performance, fixed-frequency, current-mode PWM Step-Up DC/DC Converters that incorporate internal power MOSFETs. The ACT6390 includes an integrated 0.2Ω power MOSFET that supports peak currents of up to 1.7A, while the ACT6391’s integrated 0.15Ω power MOSFET supports currents of up to 2.5A.
   
FEATURES
• Greater than 90% Efficiency
• Adjustable Output Voltage Up to 12V
• Internal 14V Power MOSFET
• Two Peak Current Options:
    − ACT6390: 1.7A, 0.2Ω
    − ACT6391: 2.5A, 0.15Ω
• Selectable 700kHz/1.3MHz Frequency
• Integrated Over-Voltage Protection (OVP)
• Programmable Soft-Start Function
• Thermal Shutdown
• Cycle-by-Cycle Over-Current Protection
• Small MSOP-8 Package
   
APPLICATIONS
• TFT LCD Monitors
• Battery-Powered Equipment
• Set-Top Boxes
• DSL and Cable Modems and Routers
   

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