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LTC3429 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3429 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LTC3429/LTC3429B 1 3429fa ■ MP3 Players ■ Digital Cameras ■ LCD Bias Supplies ■ Handheld Instruments ■ Wireless Handsets ■ GPS Receivers 600mA, 500kHz Micropower Synchronous Boost Converter with Output Disconnect Figure 1. 2-Cell to 3.3V Synchronous Boost Converter SW 4.7µH VOUT LTC3429 FB VIN SHDN 3429 F01a 1.02M 604k 10µF 4.7µF 2-CELL AA + VOUT 3.3V 250mA GND OFF ON 2-Cell to 3.3V Efficiency OUTPUT CURRENT (mA) 60 80 100 50 70 90 0.1 10 100 1000 3429 F01b 40 1 VIN = 3V VIN = 3V VIN = 2.4V VIN = 2.4V 0.01 1 100 0.001 0.1 10 0.0001 EFFICIENCY POWER LOSS ■ Up to 96% Efficiency ■ True Output Load Disconnect ■ Inrush Current Limiting and Internal Soft-Start ■ Low Voltage Start-Up: 0.85V ■ Automatic Burst Mode ® Operation with IQ ~ 20µA ■ Continuous Switching at Light Loads (LTC3429B) ■ Internal Synchronous Rectifier ■ Current Mode Control with Internal Compensation ■ Short-Circuit Protection ■ 500kHz Fixed Frequency Switching ■ Input Range: 0.5V to 4.4V ■ Output Range: 2.5V to 4.3V (Up to 5V with Schottky) ■ Shutdown Current: <1µA ■ Antiringing Control Minimizes EMI ■ Tiny External Components ■ Low Profile (1mm) SOT-23 Package FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO The LTC ®3429/LTC3429B are high efficiency synchro- nous, fixed frequency, step-up DC/DC converters with true output load disconnect, inrush current limiting and soft- start in a low profile 6-lead ThinSOT TM package. These devices are capable of supplying 100mA from a single AA cell input or 250mA from a 2-cell AA with a 3.3V output. A switching frequency of 500kHz minimizes overall solu- tion footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. Current mode PWM control with internal compensation reduces external parts count thereby saving critical board real estate. The LTC3429 shifts automatically to power saving Burst Mode operation at light loads while the LTC3429B features continuous switching at light loads. Antiringing control circuitry re- duces EMI concerns by damping the inductor in discon- tinuous mode. The devices also feature low shutdown current of under 1µA. The true output disconnect feature allows the output to be completely discharged in shutdown. It also limits the inrush of current during start-up, minimizing surge cur- rents seen by the input supply. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. |
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