CS51311 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
MFG CO.
'CS51311' PDF : 21 Pages View PDF
CS51311
ELECTRICAL CHARACTERISTICS (continued) (0°C < TA < 70°C; 0°C < TJ < 125°C; 9.0 V < VCC < 14 V;
2.0 V DAC Code (VID4 = VID3 = VID2 = VID1 = 0, VID0 = 1.0) CGATE(H) = CGATE(L) = 3.3 nF, COFF = 390 pF; unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Power Good Output
PWRGD Sink Current
PWRGD Upper Threshold
VFB = 1.7 V, VPWRGD = 1.0 V
% of Nominal DAC Code
0.5
4.0
15
mA
5.0
8.5
12
%
PWRGD Lower Threshold
% of Nominal DAC Code
−12
−8.5
−5.0
%
PWRGD Output Low Voltage
General Electrical Specifications
VFB = 1.7 V, IPWRGD = 500 μA
−
0.2
0.3
V
VCC Monitor Start Threshold
VCC Monitor Stop Threshold
Hysteresis
−
−
Start−Stop
7.9
8.4
8.9
V
7.6
8.1
8.6
V
0.15
0.3
0.6
V
VCC Supply Current
No Load on GATE(H), GATE(L)
−
12
20
mA
PACKAGE PIN #
SO−14
1, 2, 3, 4, 5
6
7
8
9
10
11
12
13
14
PACKAGE PIN DESCRIPTION
PIN SYMBOL
VID0−VID4
VFB
VOUT
VCC
GATE(H)
GND
GATE(L)
PWRGD
COFF
COMP
FUNCTION
Voltage ID DAC inputs. These pins are internally pulled up to 5.65 V if left
open. VID4 selects the DAC range. When VID4 is high (logic one), the Error
Amp reference range is 2.125 V to 3.525 V with 100 mV increments. When
VID4 is low (logic zero), the Error Amp reference voltage is 1.325 V to 2.075 V
with 50 mV increments.
Error amp inverting input, PWM comparator non−inverting input, current limit
comparator non−inverting input, PWRGD comparator input.
Current limit comparator inverting input.
Input power supply pin for the internal circuitry. Decouple with filter capacitor to
GND.
High side switch FET driver pin.
Ground pin.
Low side synchronous FET driver pin.
Power Good Output. Open collector output drives low when VFB is out of regu-
lation.
Off−Time Capacitor pin. A capacitor from this pin to GND sets the off time for
the regulator.
Error amp output. PWM comparator inverting input. A capacitor on this pin pro-
vides error amp compensation.
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