Texas Instruments announces the TPS62851x – a family of pin-to-pin 0.5-A, 1-A, and 2-A high efficiency, easy-to-use, synchronous step-down DC/DC converters. They are based on a peak current mode control topology. Low resistive switches allow up to 2-A continuous output current at high ambient temperature. The switching frequency is internally fixed at 2.25 MHz and can also be synchronized to an external clock in the range from 1.8 MHz to 4 MHz. In PWM/PFM mode, the TPS62851x automatically enters Power Save Mode at light loads to maintain high efficiency across the whole load range.
The TPS62851x provide a 1% output voltage accuracy in PWM mode which helps design a power supply with high output voltage accuracy. The SS/TR pin allows setting the start-up time or forming tracking of the output voltage to an external source. This allows external sequencing of different supply rails and limits the inrush current during start-up.
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| Efficiency versus IOUT, VOUT = 3.3 V. |
The TPS628510, TPS628511, and TPS628512 are available in a SOT583 package.
Features
- TJ = –40 °C to +150 °C
- Input voltage range: 2.7 V to 6 V
- Quiescent current 15 μA typical
- Output voltage from 0.6 V to 5.5 V
- Output voltage accuracy ±1% (PWM operation)
- Adjustable soft start-up to 10 ms
- Forced PWM or PWM/PFM operation
- Switching frequency in PWM: 2.25 MHz
- Switching Frequency external sync (1.8 MHz to 4 MHz)
- Precise ENABLE input allows:
- User-defined undervoltage lockout
- Exact sequencing
- 100% Duty cycle mode
- Active output discharge
- Spread spectrum clocking - optional
- Foldback overcurrent protection - optional
- Power-good output with window comparator
