PM6680A データシートの表示（PDF） - STMicroelectronics

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PM6680A

Dual synchronous step-down controller with adjustable output voltages plus LDO

STMicroelectronics 

PM6680A

Pin settings

Table 2. Pin functions (continued)

N° Pin

Function

Internal 5 V regulator bypass connection.

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

17 V5SW than 4.9 V, the LDO5 regulator shuts down and the LDO5 pin is directly connected to

OUT5 through a 3 Ω (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 100 mA 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

(4 Ω and 4.7 µF) between the battery and this pin is recommended.

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

20 CSENSE1 through a resistor to the drain of the synchronous rectifier (RDSON sensing) 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 33 kHz (No-audible puse skip mode).

Enable input for the switching section 1.

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

25 EN1 • The section 1 is disabled applying a voltage lower than 0.8 V.

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 and when

26 PGOOD1 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 and when

27 PGOOD2 the ouput of the switching section 2 is out of +/- 10 % of its nominal value.It is pulled

down.

28

FB1

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

voltage-divider from OUT1 to PGND to adjust the output voltage from 0.9 V to 5.5 V.

29

OUT1

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

to the output votage of the switching section.

30 COMP1 DC voltage error compensation pin for the switching section 1.

31

VCC

Device supply voltage pin. It supplies all the internal analog circuitry except the gate

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

32

VREF

Internal 1.237 V high accuracy voltage reference. It can deliver 50 µA. Bypass to

SGND with a 100 nF capacitor to reduce noise.

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