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LTC3422 Datasheet(PDF) 14 Page - Linear Technology |
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LTC3422 Datasheet(HTML) 14 Page - Linear Technology |
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14 / 16 page  LTC3422 14 3422fa 2-Cell to 3.3V at 600mA Application Figure 3. Typical Error Amplifier Compensation APPLICATIO S I FOR ATIO 1.216V FB 6 VOUT 10 VC CC1 CC2 3422 F03 RZ R2 R1 7 – + gm ERROR AMPLIFIER TYPICAL APPLICATIO S CSS 0.1 µF CC2 22pF CC1 1nF OFF ON RZ 15k COUT* 22 µF CIN* 4.7 µF VIN 1.8V TO 3.2V 2 CELLS + CB 2.2nF *LOCATE COMPONENTS CLOSE TO PINS CIN: TAIYO YUDEN X5R JMK212BJ475MD COUT: TAIYO YUDEN X5R JMK325BJ226MM L1: TDK RLF7030T-4R7M3R4 RT 28k R1 931k VOUT 3.3V 600mA R2 549k RB 301k 3422 TA02a SS VC BURST SHDN FB SYNC VOUT RT GND VIN LTC3422 L1 4.7 µH SW LOAD CURRENT (mA) 30 90 100 20 10 80 50 70 60 40 0.1 10 100 1000 3422 TA02b 0 10000 1 1000 100 10 0 1 VIN = 3V VIN = 2.4V VIN = 1.8V VIN = 3V VIN = 2.4V VIN = 1.8V VIN = 1.8V VIN = 2.4V VIN = 3V VIN = 1.8V VIN = 2.4V VIN = 3V BURST EFFICIENCY PWM EFFICIENCY PWM POWER LOSSES BURST POWER LOSSES 2-Cell to 3.3V Efficiency and Power Loss at 1MHz CSS 0.1 µF CC2 22pF CC1 1nF OFF ON RZ 15k COUT* 10 µF CIN* 10 µF VIN 0.9V TO 1.6V 1 CELL CB 2.2nF *LOCATE COMPONENTS CLOSE TO PINS CIN, COUT: TAIYO YUDEN X5R JMK212BJ106MM L1: TDK RLF7030T-4R7M3R4 RT 28k R1 931k VOUT 3.3V 240mA R2 549k RB 374k 3422 TA03a SS VC BURST SHDN FB SYNC VOUT RT GND VIN LTC3422 L1 4.7 µH SW + LOAD CURRENT (mA) 30 90 100 20 10 80 50 70 60 40 0.1 10 100 1000 3422 TA03b 0 10000 1 1000 100 10 0 1 VIN = 1.6V VIN = 1.25V VIN = 0.9V VIN = 0.9V VIN = 1.25V VIN = 1.6V BURST EFFICIENCY PWM EFFICIENCY PWM POWER LOSSES BURST POWER LOSSES 1-Cell to 3.3V at 240mA Application 1-Cell to 3.3V Efficiency and Power Loss at 1MHz |
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