LTC1876EG

DC DC Cntrlr Triple-OUT Synchronous Step Down Controller/PWM DC to DC Controller 3.5V to 36V Input 36Pin SSOP

DESCRIPTION

The LTC®1876 is a high performance triple output switching regulator. It incorporates a dual step-down switching controller that drives all N-channelsynchronous power MOSFET stages. A step-up regulator with an internal 1A, 36V switch provides the third output.

FEATURES

Step-Down Controller

■ Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise

■ Power Good Output Voltage Indicator

■ OPTI-LOOPTM Compensation Minimizes COUT

■ DC Programmed Fixed Frequency 150kHz to 300kHz

■ Wide VIN Range: 3.5V to 36V Operation

■ Very Low Dropout Operation: 99% Duty Cycle

■ Adjustable Soft-Start Current Ramping

■ Latched Short-Circuit Shutdown with Defeat Option

■ Remote Output Voltage Sense and OV Protection

■ 5V and 3.3V Standby Regulators

■ Selectable Const. Freq. or Burst ModeTM Operation

Step-Up Regulator

■ High Operating Switching Frequency of 1.2MHz

■ Low Internal VCESAT Switch: 400mV @ 1A, VIN = 3V

■ Wide VIN Range: 2.6V to 16V Operation

■ High Output Voltage: Up to 34V

APPLICATIONS

■ 3.3V Input Step-Down Converter

■ Notebook and Palmtop Computers, PDAs

■ Battery-Operated Digital Devices