CS51312GDR16 datasheet(4/18 Pages) CHERRY

Part #	CS51312GDR16

Description	Synchronous CPU Buck Controller for 12V Only Applications

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Manufacturer	CHERRY [Cherry Semiconductor Corporation]

Direct Link	http://www.cherrycorp.com/

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PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

4

Electrical Characteristics: 0˚C < TA < 70˚C; 0˚C < TJ < 125˚C; 9V < VCC1 < 14V; 9V ≤ VCC2 ≤ 20V;

2.0V DAC Code(VID4 = VID3 =VID2 = VID1 = 0, VID0 = 1), CGATE(H) = CGATE(L) = 3.3nF, COFF = 390pF; Unless otherwise stated.

Line Regulation

9V ≤ VCC1 ≤ 14V

0.01

%/V

Input Threshold

VID4, VID3, VID2, VID1, VID0

1.00

1.25

2.40

V

Input Pull-up Resistance

VID4, VID3, VID2, VID1, VID0

25

50

100

kΩ

Pull-up Voltage

5.48

5.65

5.82

V

s

GATE(H) and GATE(L)

High Voltage at 100mA

Measure VCC1/2 –GATE(L)/(H)

1.2

2.1

V

Low Voltage at 100mA

Measure GATE(L)/(H)

1.0

1.5

V

Rise Time

1.6V < GATE(H)/(L) < (VCC1/2 – 2.5V)

40

80

ns

Fall Time

(VCC1/2 – 2.5V) > GATE(L)/(H) > 1.6V

40

80

ns

GATE(H) to GATE(L) Delay

GATE(H)<2V, GATE(L)>2V, VCC1/2 = 12V 30

65

110

ns

GATE(L) to GATE(H) Delay

GATE(L)<2V, GATE(H)>2V,VCC1/2 = 12V 30

65

110

ns

GATE pull-down

Resistance to Gnd (Note 2)

20

50

115

kΩ

s

Overcurrent Protection

OVC Comparator Offset Voltage

0V ≤ VOUT ≤ 3.5V

77

86

101

mV

Discharge Threshold Voltage

0.2

0.25

0.3

V

VOUT Bias Current

0.2V ≤ VOUT ≤ 3.5V

-7.0

0.1

7.0

µA

OVC Latch Discharge Current

VCOMP = 1V

100

800

2500

µA

s

PWM Comparator

PWM Comparator Offset Voltage 0V ≤ VFB ≤ 3.5V

0.99

1.10

1.23

V

Transient Response

VFB = 0 to 3.5V

200

300

ns

s

COFF

Off-Time

1.0

1.6

2.3

µs

Charge Current

VCOFF = 1.5V

550

µA

Discharge Current

VCOFF = 1.5V

25

mA

s

Power-Good Output

PWRGD Sink Current

VFB = 1.7V, VPWRGD = 1V

0.5

4

15

mA

PWRGD Upper Threshold

% of nominal DAC code

5

8.5

12

%

PWRGD Lower Threshold

% of nominal DAC code

-12

-8.5

-5

%

PWRGD Output Low Voltage

VFB = 1.7V, IPWRGD = 500µA

0.2

0.3

V

s

Overvoltage Protection (OVP) Output

OVP Source Current

OVP = 1V

1

10

25

mA

OVP Threshold

% of nominal DAC code

5

8.5

12

%

OVP Pull-up Voltage

IOVP = 1mA, VCC1 - VOVP

1.1

1.5

V

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