NCP81252 datasheet(8/18 Pages) ONSEMI

Part #	NCP81252

Description	Single-Phase Voltage Regulator

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NCP81252

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Table 3. ELECTRICAL CHARACTERISTICS (VIN = 12 V, VCC = VCCP = 5 V, VOUT = 1.0 V, typical values are referenced to TJ =

25

°C, Min and Max values are referenced to TJ from −40°C to 125°C. unless otherwise noted.)

Characteristics

Unit

Max

Typ

Min

Symbol

Test Conditions

ADC

Voltage Range

0

2.0

V

Total Unadjusted Error (TUE)

−1

1

%

Differential Nonlinearity (DNL)

8−bit

1

LSB

Power Supply Sensitivity

±1

%

Conversion Time

30

ms

Round Robin

90

ms

VR_READY (VRRDY Output)

Rise Time

External 1 k

W pull−up to 3.3 V,

CTOT = 45 pF,

DVo = 10% to 90%

120

ns

Fall Time

External 1 k

W pull−up to 3.3 V,

CTOT = 45 pF,

DVo = 90% to 10%

20

ns

Output Voltage at Power−Up

Pulled up to 5 V via 2 k

W

−

1.0

V

VR_READY Delay (Rising)

DAC = Target to VR_READY

50

ms

VR_READY Delay (Falling)

From OCP or OVP

5

ms

VRRDY Pin Low Voltage

Voltage at VRRDY pin with 4 mA sink

current

VPG_L

−

0.3

V

VRRDY Pin Leakage Current

VRRDY = 5 V

PG_LK

−1.0

−

1.0

mA

OVER VOLTAGE PROTECTION

Absolute Over Voltage Threshold

During Soft−Start

2.8

2.9

3.0

V

Over Voltage Threshold Above DAC

VSP rising

350

400

425

mV

Over Voltage Delay

VSP rising to GH low

50

ns

UNDER VOLTAGE PROTECTION

Under Voltage Threshold Below DAC

VSP falling

250

300

350

mV

Under−voltage Delay

5

ms

OVER CURRENT PROTECTION

ILIM Threshold Current

(OCP shutdown after 50

ms delay)

ILIMTH_SLOW

8.5

10.0

12.0

mA

ILIM Threshold Current

(immediate OCP shutdown)

ILIMTH_FAST

12.0

15.0

18.0

mA

IOUT OUTPUT

Current Gain

(IOUTCURRENT) / (ILIMCURRENT);

RILIM = 20 k

W; RIOUT = 5.0 kW;

DAC = 0.8 V, 1.25 V, 1.52 V

9.5

10

10.5

A/A

Input Referred Offset Voltage

ILIM − CSREF

−5.5

−

5.5

mV

Output Source Current

ILIM sink current = 80

mA

800

mA

HIGH−SIDE MOSFET

Drain−to−Source ON Resistance

VGS = 4.5 V, ID = 10 A

RON_H

−

8.0

−

m

W

LOW−SIDE MOSFET

Drain−to−Source ON Resistance

VGS = 4.5 V, ID = 10 A

RON_L

−

4.0

−

m

W

5. Guaranteed by design, not tested in production.

6. TJ = 25°C.

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