Triple output micromodule regulator
Linear Technology Corporation's LTM4634 regulates common intermediate power buses such as 12 V, 5 V and 3.3 V in instrumentation with its combination of wide output voltage range, a thermally efficient package, tight regulation accuracy, and small solution size.
Linear Technology Corporation's LTM4634 is a triple output step-down µModule (micromodule) regulator in a 15 mm x 15 mm x 5.01 mm BGA package with integrated heat sink. The thermally efficient package enables the LTM4634 to deliver full current on all three outputs (5 A, 5 A, and 4 A), more than 70W of output power at 65 C ambient with 200 LFM airflow. The LTM4634 fits within 4.5 cm2 on a dual-sided PCB with 13 ceramic capacitors and three resistors. The LTM4634 comes with three dc/dc controllers, power switches, inductors and compensation in a single package. The regulated output voltage for channels 1 and 2 is adjustable between 0.8 V to 5.5 V, with the third channel from 0.8 V to 13.5 V, each with ±1.5% accuracy over line, load and temperature.
The LTM4634's three switchers operate from an input voltage from 4.75 V to 28 V. Separate input power pins for each switcher enables channel 1 and/or channel 2 to be supplied from a 12.5 V, 50 W intermediate bus generated from channel 3. The three switchers, operating from the same internal or optional external clock signal, are internally phase shifted by 120° to minimize input ripple. For loads in excess of 5 A, channels 1 and 2 can be paralleled to support up to 10 A. Output overvoltage and overcurrent fault protection are included in the regulator. The LTM4634's internal temperature can be observed via two internal temperature diode monitors located next to the power stages.
Linear Technology Corporation
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