LTC3400 Linear Technology, LTC3400 Datasheet
LTC3400
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LTC3400 Summary of contents
Page 1
... The current mode PWM design is internally compensated, reducing external parts count. The LTC3400 features automatic shifting to power saving Burst Mode operation at light loads, while the LTC3400B features continuous switching at light loads. Antiringing control circuitry reduces EMI concerns by damping the inductor in discontinuous mode, and the devices feature low shutdown current of under 1 A ...
Page 2
... SHDN Input Current Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC3400E/LTC3400BE are guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls ...
Page 3
... Fixed Frequency and Burst Mode Operation V OUT(AC) 100mV/DIV 60mA I OUT 1.3V 10ms/DIV 3400 G08 3.3V OUT I = 60mA OUT 4.7 F OUT LTC3400/LTC3400B Minimum Start-Up Voltage vs Load Current 1 1.3 1.2 1.1 1.0 0.9 0.8 120 0 (mA) CURRENT SOURCE LOAD OUT SW Pin Antiringing Operation V SW 1V/DIV ...
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... LTC3400/LTC3400B CTIO S SW (Pin 1): Switch Pin. Connect inductor between SW and V . Optional Schottky diode is connected between IN SW and V . Keep these PCB trace lengths as short and OUT wide as possible to reduce EMI and voltage overshoot. If the inductor current falls to zero, or SHDN is low, an ...
Page 5
... Once initiated, the Burst Mode operation circuitry shuts down most of the device, only keeping alive the circuitry required to monitor the output voltage. This is referred to as the sleep state. In sleep, the LTC3400 draws only 19 A from the output capacitor, greatly enhancing efficiency. When the output voltage has drooped approximately 1% from nominal, the LTC3400 wakes up and commences normal PWM operation ...
Page 6
... Increasing the inductance above 10 H will increase size while providing little improvement in output current capability. The approximate output current capability of the LTC3400/ LTC3400B versus inductance value is given in the equa- tion below and illustrated graphically in Figure ...
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... Do not use ordinary rectifier diodes, since the slow recovery times will compromise efficiency. A Schottky diode is optional for output voltages below 4.5V, but will increase converter efficiency 3%. LTC3400/LTC3400B PHONE WEBSITE (803) 448-9411 www.avxcorp.com (714) 852-2001 www ...
Page 8
... SINGLE AA CELL OFF ON D1: CENTRAL SEMI CMDSH2-3 L1: COILCRAFT DS1608-472 8 Single Cell to 3.3V Synchronous Boost Converter with Load Disconnect in Shutdown Si2305DS OUT R3 LTC3400 510k 4 3 SHDN FB C2 GND 4 510k M1 V OUT 3.3V R1 100mA 1.02M 1% R2 604k 1% Q1 2N3904 ...
Page 9
... Single Lithium Cell to 5V, 250mA LITHIUM C1 CELL 4 OUT C2 LTC3400 4 OFF ON SHDN FB GND 2 3. Efficiency 100 LTC3400 100 LOAD CURRENT (mA) 3400 TA02b LTC3400/LTC3400B R1 1.82M 1% R2 604k 1% 3400 TA02a 1000 3400f 9 ...
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... TYPICAL APPLICATIO S Single Cell AA Cell to 3V Synchronous Boost Converter + SINGLE AA CELL D1, D2: ZETEX FMND7000 DUAL DIODE L1: COILCRAFT DS1608-472 4 4 OUT R1 1.02M LTC3400 OFF ON SHDN FB R2 GND 750k OUT1 3V C2 90mA 4 OUT2 – ...
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... U S6 Package 6-Lead Plastic SOT-23 (Reference LTC DWG # 05-08-1636) 0.854 0.127 1.50 – 1.75 2.80 BSC (NOTE 4) 0.95 BSC 0.80 – 0.90 1.00 MAX 0.09 – 0.20 (NOTE 3) LTC3400/LTC3400B 2.90 BSC (NOTE 4) PIN ONE ID 0.30 – 0.45 TYP 6 PLCS (NOTE 3) 0.01 – 0.10 1.90 BSC S6 TSOT-23 0801 3400f 11 ...
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... FAX: (408) 434-0507 Single AA Cell to 2.5V Synchronous Boost Converter SINGLE C1 AA CELL SW 4 OUT R1 1.02M LTC3400 OFF ON SHDN FB R2 GND 1.02M 2 1% COMMENTS with Single Li-Ion Cell 1.5A Switch, 1.6V to 18V Input Range, Input or Output Current Limiting 1A Gate Drive, 1 ...