PM6681A STMicroelectronics, PM6681A Datasheet - Page 7

• Manufacturer Part Number: PM6681A
• Description: Dual synchronous step down controller with adjustable LDO
• Manufacturer: STMicroelectronics

PM6681A
Table 2.
N°
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
CSENSE1
PGOOD1
PGOOD2
PHASE1
HGATE1
COMP1
BOOT1
LDO5
OUT1
VREF
SKIP
VCC
EN1
FB1
VIN
Pin
Pin functions (continued)
5 V internal regulator output. It can provide up to 100 mA peak current.
LDO5 pin supplies embedded low side gate drivers and an external load.
Device supply voltage input and battery voltage sense. A bypass filter
(4 W 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 through a resistor to the drain of the synchronous rectifier
(R
supply controller.
Switch node connection and return path for the high side driver for the
section 1. It is also used as negative current sense input.
High-side gate driver output for section 1. This is the floating gate driver
output.
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.
– 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
Enable input for the switching section 1.
– The section 1 is enabled applying a voltage greater than 2.4 V to this pin.
– 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 output signal for the section 1. This pin is an open drain output
and when the output of the switching section 1 is out of +/- 10 % of its
nominal value.It is pulled down.
Power Good output signal for the section 2. This pin is an open drain output
and when the output 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
resistive voltage-divider from OUT1 to PGND to adjust the output voltage
from 0.9 V to 5.5 V.
Output voltage sense for the switching section 1.This pin must be directly
connected to the output voltage of the switching section.
DC voltage error compensation pin for the switching section 1.
Device supply voltage pin. It supplies all the internal analog circuitry except
the gate drivers (see LDO5). Connect this pin to LDO5.
Internal 1.237 V high accuracy voltage reference. It can deliver 50 µA.
Bypass to SGND with a 100 nF capacitor to reduce noise.
switching frequency is kept higher than 33 kHz
(No-audible pulse skip mode).
DS(on)
sensing) to obtain a positive current limit threshold for the power
Function
Pin settings
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