L6732 datasheet(11/37 Pages) STMICROELECTRONICS

Part #	L6732

Description	Adjustable step-down controller with synchronous rectification

PDF	37 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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L6732

Device description

11/37

Device description

5.1

Oscillator

The switching frequency can be fixed to two values: 250 kHz or 500 kHz by setting the

proper voltage at the EAREF pin (see Table 4. pins function and section 4.3 Internal and

external reference).

5.2

Internal LDO

An internal LDO supplies the internal circuitry of the device. The input of this stage is the

VCC pin and the output (5 V) is the VCCDR pin (Figure 3.).

The LDO can be by-passed, providing directly a 5 V voltage to VCCDR. In this case VCC and

VCCDR pins must be shorted together as shown in Figure 4. VCCDR pin must be filtered with

at least 1 µF capacitor to sustain the internal LDO during the recharge of the bootstrap

capacitor. VCCDR also represents a voltage reference for PGOOD pin (see Table 4. pins

function).

Figure 3.

LDO block diagram

LDO

4.5

÷14V

L6732 Datasheet(PDF) 11 Page - STMicroelectronics