PM6685 datasheet(7/52 Pages) STMICROELECTRONICS

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PM6685

Pin settings

7/52

Name

Description

V5SW

Internal 5V regulator bypass connection.

– If V5SW is connected to OUT5 (or to an external 5V supply) and V5SW is

greater than 4.9V, the LDO5 regulator shuts down and the LDO5 pin is directly

connected to OUT5 through a 3W (max) switch.

– If V5SW is connected to GND, the LDO5 linear regulator is always on.

LDO5

5V internal regulator output. It can provide up to 100mA peak current. LDO5 pin

supplies embedded low side gate drivers and an external load.

VIN

Device input supply voltage. A bypass filter (4W and 4.7mF) between the battery

and this pin is recommended.

CSENSE5

Current sense input for the 5V section. This pin must be connected through a

resistor to the drain of the synchronous rectifier (RDSON sensing) to set the

current limit threshold.

PHASE5

Switch node connection and return path for the high side driver for the 5V

section.

HGATE5

High-side gate driver output for the 5V section.

BOOT5

Bootstrap capacitor connection for the 5V section. It supplies the high-side gate

driver.

SKIP

Pulse skip mode control input.

– If the pin is connected to LDO5 the PWM mode is enabled.

– If the pin is connected to GND, the pulse skip mode is enabled.

– If the pin is connected to VREF the pulse skip mode is enabled but the

switching frequency is kept higher than 33kHz (No-audible pulse skip mode).

EN5

5V SMPS enable input.

– The 5V section is enabled applying a voltage greater than 2.4V to this pin.

– The 5V section is disabled applying a voltage lower than 0.8V.

When the section is disabled the High Side gate driver goes low and Low Side

gate driver goes high.

PGOOD5

Power Good signal for the 5V section. This pin is an open drain output.

The pin is pulled low if the output is disabled or if it is out of approximately +/-

10% of its nominal value.

PGOOD3

Power Good signal for the 3.3V section. This pin is an open drain output.

The pin is pulled low if the output is disabled or if it is out of approximately +/-

10% of its nominal value.

LDO3SEL

Control pin for the 3.3V internal linear regulator. This pin determines three

operative modes for the LDO3.

– If LDO3_SEL pin is connected to GND the LDO3 output is always disabled.

– If LDO3_SEL pin is connected to LDO5 the LDO3 internal regulator is always

enabled.

– If LDO3_SEL pin is connected to VREF and OUT3 is greater than about 3V,

the LDO3 regulator shuts down and the LDO3 pin is be directly connected to

OUT3 through a 3W (max) switch.

OUT5

Output voltage sense for the 5V switching section.This pin must be directly

connected to the output voltage of the switching section.

COMP5

DC voltage error compensation pin for the 5V switching section..

VCC

Device Supply Voltage pin. It supplies the all the internal analog circuitry except

the gate drivers (see LDO5). Connect this pin to LDO5.

Table 2.

Pin functions (continued)

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