AN727
features include an integrated input undervoltage lockout, power on reset, integrated soft start, light load pulse skipping mode selection, synchronization, clock output for master-slave configuration of multiple regulators, unmitted power-good parator, and over temperature protection. An output power in excess of 2 W at 3.6 VO is possible in 0.3 square inches.
TYPICAL APPLICATION CIRCUIT
+VIN 5
- 10 V 1 C1 10 m F 16 V
PGND
R1- 51 W C1 0.1 m F
Si9167
ENABLE/DISABLE PWM/PSM R9- 51 k W 1 2 3 4 5 6 7 8 1.3 V C3 0.1 m F 9 10 SD PWM/PSM VIN VIN POK SYNC CLK GND VREF FB COIL COIL PGND COIL PGND POKIN VO VDD ROSC P R3 8.2 k W C5 1000 p F C4 56 p F 20 MBRO520T1 19 18 17 16 15 14 13 12 11 R2 75 k W D1
3.6 V @ 600 m A L1 4.7 m H IHLP2525 C1 10 m F 16 V C9 0.1 m F 7 VOUT
PGND
R7 105 k W
R8 64 k W
C6 0.1 m F R4 200 W C7 330 p F R6 12.4 k W R5 22 k W
STAR GND CON
- Optional
FIGURE 1. Typical Application Circuit- Buck
Document Number: 70959 07-Jul-99 .vishay. S Fax Back 408-970-5600
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