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The TPS51120 is a highly sophisticated dual current mode synchronous step-down controller. It is a full-featured controller designed to run directly off three to four-cell Li-ion battery and provide high power and 5-V, 3.3-V, or both, standby regulation for all the downstream circuitry in a notebook computer system. High current, 100-mA, 5-V, or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors, and seamless transition to reduced frequency operation at light-load condition. Optional D-CAP™ mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts.
The TPS51120EVM-001 evaluation module is a high efficiency, dual synchronous buck converter providing 5 V at 6 A and 3.3 V at 6 A from 8-V to 25-V input. This user’s guide describes the TPS51120EVM-001 performance in D-CAP mode and RDS(on) current sensing.
Specifications | Test Conditions | MIN | TYP | MAX | Unit | |
---|---|---|---|---|---|---|
Input voltage range (VBAT) | 8 | 12 | 25 | V | ||
CH1 | Output voltage | 5 | V | |||
Operating frequency | TONSEL: VREF2, VBAT = 12 V, IOUT1 = 6 A | 280 | kHz | |||
Output current | VBAT = 8 V to 25 V | 6 | A | |||
Overcurrent limit | VBAT = 12 V | 10 | A | |||
Output ripple voltage | VBAT = 12 V, IOUT1 = 6 A | 40 | mVp-p | |||
CH2 | Output voltage | 3.3 | V | |||
Operating frequency | TONSEL: VREF2, VBAT = 12 V, IOUT2 = 6 A | 430 | kHz | |||
Output current | VBAT = 8 V to 25 V | 6 | A | |||
Overcurrent limit | VBAT = 12 V | 10 | A | |||
Output ripple voltage | VBAT = 12 V, IOUT2 = 6 A | 45 | mVp-p |