PM6681A(2006) Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

PM6681A
(Rev.:2006)

Dual step-down controller with adjustable LDO

STMicroelectronics 

Pin settings

PM6681A

Table 1. Pin functions (continued)

N°

Pin

Function

Feedback input for the adjustable internal linear regulator. This pin is

16

LDO FB connected to a resistive voltage-divider from LDO to SGND to adjust the

output voltage from 0.9V to 3.3V.

Internal 5V regulator bypass connection.

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

17

V5SW

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.

18

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.

19

VIN

Device supply voltage input and battery voltage sense. A bypass filter (4Ω

and 4.7mF) between the battery and this pin is recommended.

Positive current sense input for the switching section 1. This pin must be

20 CSENSE1 connected through a resistor to the drain of the synchronous rectifier to

obtain a positive current limit threshold for the power supply controller.

21

PHASE1

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

section 1.It is also used as negative current sense input.

22

HGATE1

High-side gate driver ouput for section 1. This is the floating gate driver

output.

23

BOOT1

Bootstrap capacitor connection for the switching section 1. It supplies the

high-side gate driver.

Pulse skipping mode control input.

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

24

SKIP

– 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 puse skip

mode).

Enable input for the switching section 1.

– The section 1 is enabled applying a voltage greater than 2.4V to this pin.

25

EN1

– The section 1 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.

Power Good ouput signal for the section 1. This pin is an open drain ouput

26

PGOOD1 and when the ouput of the switching section 1 is out of +/- 10% of its

nominal value.It is pulled down.

Power Good ouput signal for the section 2. This pin is an open drain ouput

27

PGOOD2 and when the ouput of the switching section 2 is out of +/- 10% of its

nominal value.It is pulled down.

Feedback input for the switching section 1. This pin is connected to a

28

FB1

resistive voltage-divider from OUT1 to PGND to adjust the output voltage

from 0.9V to 5.5V.

29

OUT1

Output voltage sense for the switching section 1.This pin must be directly

connected to the output votage of the switching section.

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