Datasheet LTC3429, LTC3429B (Analog Devices) - 10
| Fabricante | Analog Devices |
| Descripción | 600mA, 500kHz Micropower Synchronous Boost Converter with Output Disconnect |
| Páginas / Página | 12 / 10 — TYPICAL APPLICATIO S. Applications Where VOUT > 4.3V |
| Formato / tamaño de archivo | PDF / 204 Kb |
| Idioma del documento | Inglés |
TYPICAL APPLICATIO S. Applications Where VOUT > 4.3V
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LTC3429/LTC3429B
U TYPICAL APPLICATIO S Applications Where VOUT > 4.3V
improvement but will negate the output disconnect fea- ture. If output disconnect is required, an active snubber When the output voltage is programmed above 4.3V, it is network is suggested as shown below. Examples of Schot- necessary to add a Schottky diode either from SW to VOUT, tky diodes are: MBR0520L, PMEG2010EA, 1N5817 or or to add a snubber network in order to maintain an equivalent. acceptable peak voltage on the SW pin. The Schottky diode between SW and VOUT will provide a peak efficiency
Application Circuit for VOUT > 4.3V Where Inrush Current Limiting and Output Disconnect are Required
L1
Li-Ion to 5V Efficiency
4.7µH D1* VIN 100 100 2.7V TO 4.2V 1 C3* + C1 V MP1 IN = 4.2V 0.22 Li-Ion 4.7µF SW µF VOUT 6 5 90 10 V V IN OUT 5V EFFICIENCY VIN = 3.6V R1 250mA POWER LOSS (W) LTC3429 1.82M 80 1 4 3 C2 OFF ON SHDN FB 10µF R2 GND 70 0.1 604k VIN = 3.6V 2 EFFICIENCY (%) V 3429 TA04 60 IN = 4.2V 0.01 *LOCATE COMPONENTS CLOSE TO THE PIN POWER LOSS C1: TAIYO YUDEN X5R JMK212BJ475MM 50 0.001 C2: TAIYO YUDEN X5R JMK212BJ106MM D1: MOTOROLA MBR0520L L1: COILCRAFT D0160C-472 40 0.0001 MP1: ZETEX ZXM61P02F 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 3429 TA04b
Application Circuit for VOUT > 4.3V Where Inrush Current Limiting and Output Disconnect are Not Required
L1
2-Cell to 5V Efficiency
4.7µH D1* V 100 100 IN + 1 2 AA C1 CELL 4.7µF SW V 6 5 VOUT 90 IN = 3V 10 V V IN OUT 5V R1 150mA EFFICIENCY POWER LOSS (W) LTC3429 80 VIN = 2.4V 1 1.82M 4 3 C2 OFF ON SHDN FB 10µF V GND R2 70 IN = 2.4V 0.1 604k 2 VIN = 3V EFFICIENCY (%) 3429 TA05 60 0.01 *LOCATE COMPONENTS CLOSE TO THE PIN POWER LOSS C1: TAIYO YUDEN X5R JMK212BJ475MM 50 0.001 C2: TAIYO YUDEN X5R JMK212BJ106MM D1: MOTOROLA MBR0520L L1: COILCRAFT D0160C-472 40 0.0001 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 3429 TA05b 3429fa 10
U TYPICAL APPLICATIO S Applications Where VOUT > 4.3V
improvement but will negate the output disconnect fea- ture. If output disconnect is required, an active snubber When the output voltage is programmed above 4.3V, it is network is suggested as shown below. Examples of Schot- necessary to add a Schottky diode either from SW to VOUT, tky diodes are: MBR0520L, PMEG2010EA, 1N5817 or or to add a snubber network in order to maintain an equivalent. acceptable peak voltage on the SW pin. The Schottky diode between SW and VOUT will provide a peak efficiency
Application Circuit for VOUT > 4.3V Where Inrush Current Limiting and Output Disconnect are Required
L1
Li-Ion to 5V Efficiency
4.7µH D1* VIN 100 100 2.7V TO 4.2V 1 C3* + C1 V MP1 IN = 4.2V 0.22 Li-Ion 4.7µF SW µF VOUT 6 5 90 10 V V IN OUT 5V EFFICIENCY VIN = 3.6V R1 250mA POWER LOSS (W) LTC3429 1.82M 80 1 4 3 C2 OFF ON SHDN FB 10µF R2 GND 70 0.1 604k VIN = 3.6V 2 EFFICIENCY (%) V 3429 TA04 60 IN = 4.2V 0.01 *LOCATE COMPONENTS CLOSE TO THE PIN POWER LOSS C1: TAIYO YUDEN X5R JMK212BJ475MM 50 0.001 C2: TAIYO YUDEN X5R JMK212BJ106MM D1: MOTOROLA MBR0520L L1: COILCRAFT D0160C-472 40 0.0001 MP1: ZETEX ZXM61P02F 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 3429 TA04b
Application Circuit for VOUT > 4.3V Where Inrush Current Limiting and Output Disconnect are Not Required
L1
2-Cell to 5V Efficiency
4.7µH D1* V 100 100 IN + 1 2 AA C1 CELL 4.7µF SW V 6 5 VOUT 90 IN = 3V 10 V V IN OUT 5V R1 150mA EFFICIENCY POWER LOSS (W) LTC3429 80 VIN = 2.4V 1 1.82M 4 3 C2 OFF ON SHDN FB 10µF V GND R2 70 IN = 2.4V 0.1 604k 2 VIN = 3V EFFICIENCY (%) 3429 TA05 60 0.01 *LOCATE COMPONENTS CLOSE TO THE PIN POWER LOSS C1: TAIYO YUDEN X5R JMK212BJ475MM 50 0.001 C2: TAIYO YUDEN X5R JMK212BJ106MM D1: MOTOROLA MBR0520L L1: COILCRAFT D0160C-472 40 0.0001 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 3429 TA05b 3429fa 10