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LTC3421 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3421 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC3421 1 3421f s Handheld Computers s Cordless Phones s GPS Receivers s Battery Backup Supplies , LTC and LT are registered trademarks of Linear Technology Corporation. s Synchronous Rectification: Up to 96% Efficiency s True Output Disconnect s Inrush Current Limiting s Very Low Quiescent Current: 12 µA s Up to 1.5A Continuous Output Current s Fixed Frequency Operation Up to 3MHz s 0.5V to 4.5V Input Range s 2.4V to 5.25V Adjustable Output Voltage s Guaranteed 1V Start-Up s Programmable Current Limit s Programmable Soft-Start s Synchronizable Oscillator s Manual or Automatic Burst Mode ® Operation s Low-Battery Comparator s <1 µA Shutdown Current s 1.22V Reference Output Voltage s Small (4mm × 4mm) Thermally Enhanced QFN Package 3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect Burst Mode is a registered trademark of Linear Technology Corporation. The LTC ®3421 is a high efficiency, current mode, fixed frequency, step-up DC/DC converter with true output dis- connect and inrush current limiting. The device includes a 0.10 Ω N-channel MOSFET switch and a 0.14Ω P-channel synchronous rectifier. This product has the ability to sim- ply program the output voltage, switching frequency, cur- rent limit, soft-start, Burst Mode threshold and loop compensation with external passive components. Quiescent current is only 12 µA during Burst Mode opera- tion, maximizing battery life in portable applications. The oscillator frequency can be programmed up to 3MHz and can be synchronized to an external clock applied to the SYNC pin. An open-drain uncommitted low-battery com- parator is included. The part maintains operation in applications with a secondary cell powering the output voltage during shutdown. Other features include: 1 µAshutdown,antiringingcontrol, thermal limit and reference output. The LTC3421 is available in a small 4mm × 4mm QFN package. SHDN ENB VREF LBI LBO SYNC ILIM VOUTS VOUT VOUT VOUT FB VC BURST VIN 221 14 15 16 18 17 19 20 1 24 9 13 12 11 10 5 6 8 7 22 23 3 4 SW SW L1 4.7 µH SW SS RT GND LTC3421 0.1 µF 0.1 µF 470pF C5* 22 µF C1* 4.7 µF VIN 1.8V TO 3V 2 CELLS 28k 20k 100k 340k VOUT 3.3V 1.2A 200k 3421 TA01 45.3k *LOCATE COMPONENTS CLOSE TO PINS C1: TAIYO YUDEN JMK212BJ106MM PGND PGND PGND C5: TAIYO YUDEN JMK325BJ226MM L1: TDK RLF7030T-4R7M3R4 2-Cell to 3.3V Efficiency OUTPUT CURRENT (mA) 30 90 100 20 10 80 50 70 60 40 0.1 10 100 1000 3421 G02 0 1 Burst Mode OPERATION VIN = 3V VOUT = 3.3V fOSC = 1MHz VIN = 2.4V VIN = 2V DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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