NCP5425DB datasheet(4/22 Pages) ONSEMI

Part #	NCP5425DB

Description	Dual Synchronous Buck Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP5425

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ELECTRICAL CHARACTERISTICS (0

°C < TJ < 125°C; ROSC = 30.9 k, CCOMP1,2 = 0.1 mF, 4.75 V < VCC < 13.2 V;

10.8 V < BST < 20 V, CGATE(H)1,2 = CGATE(L)1,2 = 1.0 nF; unless otherwise specified.)

Characteristic

Test Condition

Min

Typ

Max

Unit

ERROR AMPLIFIER

VFB1 Input Bias Current

VFB1 = 0 V

−

0.1

1.0

mA

VFB2, VREF2 Input Bias Current

VFB2, VREF2 = 0.8 V

−

0.1

1.0

mA

Common Mode Input Voltage Range

−

0.3

−

1.0

V

COMP1(2) Source Current

COMP1(2) = 1.2 V to 2.5 V; VFB1(2) = 0.6 V

15

30

60

mA

COMP1(2) Sink Current

COMP1(2) = 1.2 V; VFB1(2) = 1.0 V

15

30

60

mA

Reference Voltage

COMP1 = VFB1

0.792

0.800

0.808

V

COMP1 Max Voltage

COMP2 Max Voltage, Mode Floating

COMP2 Max Voltage, Mode = 0

VFB1(2) = 0.6 V

−

3.0

−

2.0

3.1

2.0

2.1

−

2.1

V

COMP1(2) Min Voltage

VFB1(2) = 1.2 V

−

0.10

0.20

V

Open Loop Gain

−

95

−

dB

Unity Gain Bandwidth

−

40

−

kHz

PSRR @ 1.0 kHz

−

70

−

dB

Transconductance

−

32

−

mmho

Output Impedance

−

2.5

−

M

W

GATE(H) AND GATE(L)

High Voltage (AC)

VCC − GATE(L)1,2

BST − GATE(H)1,2 (Note 2)

−

0

0.5

V

Low Voltage (AC)

GATE(L)1,2 or GATE(H)1,2 (Note 2)

−

0

0.5

V

Rise Time

1.0 V < GATE(L)1,2 < VCC − 1.0 V

1.0 V < GATE(H)1,2 < BST − 1.0 V

−

25

80

ns

Fall Time

VCC − 1.0 > GATE(L)1,2 > 1.0 V

BST − 1.0 > GATE(H)1,2 > 1.0 V

−

25

80

ns

GATE(H) to GATE(L) Delay

GATE(H)1,2 < 2.0 V

GATE(L)1,2 > 2.0 V

20

40

80

ns

GATE(L) to GATE(H) Delay

GATE(L)1,2 < 2.0 V

GATE(H)1,2 > 2.0 V

20

40

80

ns

GATE(H)1(2) and GATE(L)1(2) Pull−Down

Resistance to GND (Note 2)

50

125

280

k

W

PWM COMPARATOR

Propagation Delay

COMP1(2) = 1.0 V

VFB1(2) = 0 to 1.2 V (Note 2)

−

200

300

ns

PWM Comparator Offset

VFB1(2) = 0 V; Increase COMP1(2) until

GATE(H)1(2) starts switching

0.20

0.30

0.45

V

Artificial Ramp

Duty Cycle = 50%

55

95

150

mV

Minimum Pulse Width

(Note 2)

−

80

130

ns

2. Guaranteed by design, not 100% tested in production.

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