CS5150H Datasheet, PDF (5/17 Pages) Cherry Semiconductor Corporation – CPU 4-Bit Synchronous Buck Controller

PACKAGE PIN #
16 Lead SO Narrow
1, 2, 3, 4
5
6
7
8
9
10
11
12
13
14
15
16
CS5150H
PACKAGE PIN DESCRIPTION
PIN SYMBOL
V_ID0−V_ID3
SS
NC
C_OFF
V_FFB
V_CC2
V_GATE(H)
PGND
V_GATE(L)
V_CC1
LGND
COMP
V_FB
FUNCTION
Voltage ID DAC input pins. These pins are internally pulled
up to 5.0 V providing logic ones if left open. The DAC range
is 2.14 V to 3.54 V with 100 mV increments. V_ID0 − V_ID3
select the desired DAC output voltage. Leaving all 4 DAC
input pins open results in a DAC output voltage of 1.244 V,
allowing for adjustable output voltage, using a traditional
resistor divider.
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.
No Connection.
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.
Fast feedback connection to the PWM comparator. This pin
is connected to the regulator output. The inner feedback loop
terminates on time.
Boosted power for the high side gate driver.
High FET driver pin capable of 1.5 A peak switching current.
Internal circuit prevents V_GATE(H) and V_GATE(L) from being in
high state simultaneously.
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.
Low FET driver pin capable of 1.5 A peak switching current.
Input power for the IC and low side gate driver.
Signal ground for the IC. All control circuits are referenced to
this pin.
Error amplifier compensation pin. A capacitor to ground
should be provided externally to compensate the amplifier.
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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