The LTC1142/LTC1142L/LTC1142HV are dual synchronous step-down switching regulator controllers featuring automatic Burst Mode™ operation to maintain high efficiencies at low output currents. The devices are composed of two separate regulator blocks, each driving a pair of external complementary power MOSFETs, at switching frequencies up to 250kHz, using a constant off-time current mode architecture providing constant ripple current in the inductor. The operating current level for both regulators is user programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V* to 18V (20V maximum). Constant off-time architecture provides low dropout regulation limited only by the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor. The LTC1142 series is ideal for applications requiring dual output voltages with high conversion efficiencies over a wide load current range in a small amount of board space. Dual Outputs: 3.3V and 5V or User Programmable Ultrahigh Efficiency: Over 95% Possible Current Mode Operation for Excellent Line and Load Transient Response High Efficiency Maintained over 3 Decades of Output Current Low Standby Current at Light Loads: 160µA/Output Independent Micropower Shutdown: IQ < 40µA Wide VIN Range
The LTC1142 family provides dual synchronous step‑down regulator controllers with programmable output voltages. Features include ultrahigh efficiency (over 95%), low standby current, and a wide input range, making them suitable for notebook, portable, and battery‑operated applications.
The datasheet includes absolute maximum ratings, detailed electrical characteristics, pin functions, typical performance graphs, and example application circuits. It also specifies switching frequencies up to 250 kHz and offers both fixed 3.3 V/5 V outputs or user‑programmable voltages via external resistors.
| Dual Outputs | 3.3 V and 5 V (or user programmable) |
|---|---|
| Input Voltage Range | 3.5 V to 20 V |
| Efficiency | Over 95 % |
| Standby Current (Light Load) | 160 µA per output |
| Micropower Shutdown Current | < 40 µA |
| Switching Frequency | up to 250 kHz |
The regulators operate from 3.5 V up to 20 V.
It provides dual outputs of 3.3 V and 5 V, or user‑programmable voltages.
The devices can achieve efficiencies over 95 %.
The shutdown current is less than 40 µA.