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CS5160 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. CS5160
Description  CPU 5−Bit Synchronous Buck Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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CS5160 Datasheet(HTML) 6 Page - ON Semiconductor

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CS5160
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6
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
PIN SYMBOL
FUNCTION
16 Lead SO Narrow
1, 2, 3, 4, 6
VID0−VID4
Voltage ID DAC input pins. These pins are internally pulled
up to 5.0 V providing logic ones if left open. VID4 selects the
DAC range. When VID4 is High (logic one), the DAC range
is 2.10 V to 3.50 V with 100 mV increments. When VID4 is
Low (logic zero), the DAC range is 1.30 V to 2.05 V with
50 mV increments. VID0 − VID4 select the desired DAC out-
put voltage. Leaving all 5 DAC input pins open results in a
DAC output voltage of 1.2440 V, allowing for adjustable
output voltage, using a traditional resistor divider.
5
SS
Soft Start Pin. A capacitor from this pin to LGnd in conjunc-
tion with internal 60 μA current source provides Soft Start
function for the controller. This pin disables fault detect func-
tion during Soft Start. When a fault is detected, the Soft Start
capacitor is slowly discharged by internal 2.0 μA current
source setting the time out before trying to restart the IC.
Charge/discharge current ratio of 30 sets the duty cycle for
the IC when the regulator output is shorted.
7
COFF
A capacitor from this pin to ground sets the time duration for
the on board one shot, which is used for the constant off time
architecture.
8
VFFB
Fast feedback connection to the PWM comparator. This pin
is connected to the regulator output. The inner feedback loop
terminates on time.
9
VCC2
Boosted power for the high side gate driver.
10
VGATE(H)
High FET driver pin capable of 1.5 A peak switching current.
Internal circuit prevents VGATE(H) and VGATE(L) from being in
high state simultaneously.
11
PGnd
High current ground for the IC. The MOSFET drivers are
referenced to this pin. Input capacitor ground and the source
of lower FET should be tied to this pin.
12
VGATE(L)
Low FET driver pin capable of 1.5 A peak switching current.
13
VCC1
Input power for the IC and low side gate driver.
14
LGnd
Signal ground for the IC. All control circuits are referenced to
this pin.
15
COMP
Error amplifier compensation pin. A capacitor to ground
should be provided externally to compensate the amplifier.
16
VFB
Error amplifier DC feedback input. This is the master voltage
feedback which sets the output voltage. This pin can be con-
nected directly to the output or a remote sense trace.


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