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CS51313 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. CS51313
Description  Synchronous CPU Buck Controller Capable of Implementing Multiple Linear Regulators
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS51313 Datasheet(HTML) 6 Page - ON Semiconductor

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CS51313
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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
Unit
Max
Typ
Min
Test Conditions
Power Good Output
PWRGD Sink Current
VFB = 1.7 V, VPWRGD = 1.0 V
0.5
4.0
15
mA
PWRGD Upper Threshold
% of Nominal DAC Code
5.0
8.5
12
%
PWRGD Lower Threshold
% of Nominal DAC Code
−12
−8.5
−5.0
%
PWRGD Output Low Voltage
VFB = 1.7 V, IPWRGD = 500 μA
0.2
0.3
V
Overvoltage Protection (OVP) Output
OVP Source Current
OVP = 1.0 V
1.0
10
25
mA
OVP Threshold
% of Nominal DAC Code
5.0
8.5
12
%
OVP Pull−Up Voltage
IOVP = 1.0 mA, VCC − VOVP
1.1
1.5
V
General Electrical Specifications
VCC Monitor Start Threshold
7.9
8.4
8.9
V
VCC Monitor Stop Threshold
7.6
8.1
8.6
V
Hysteresis
Start−Stop
0.15
0.3
0.6
V
VCC Supply Current
No Load on GATE(H), GATE(L)
12
20
mA
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
PIN SYMBOL
FUNCTION
SO−16
1, 2, 3, 4, 6
VID0−VID4
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.
5
VREF
Bandgap Reference Voltage. It can be used to generate other regulated output
voltages.
7
VFB
Error amp inverting input, PWM comparator non−inverting input, current limit
comparator non−inverting input, PWRGD and OVP comparator input.
8
VOUT
Current limit comparator inverting input.
9
VCC
Input power supply pin for the internal circuitry. Decouple with filter capacitor to
GND.
10
GATE(H)
High side switch FET driver pin.
11
GND
Ground pin.
12
GATE(L)
Low side synchronous FET driver pin.
13
OVP
Overvoltage protection pin. Goes high when overvoltage condition is detected
on VFB.
14
PWRGD
Power Good Output. Open collector output drives low when VFB is out of regu-
lation.
15
COFF
Off−Time Capacitor pin. A capacitor from this pin to GND sets the off time for
the regulator.
16
COMP
Error amp output. PWM comparator inverting input. A capacitor to GND pro-
vides error amp compensation.


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