NCP5211A datasheet(4/16 Pages) ONSEMI

Part #	NCP5211A

Description	Low Voltage Synchronous Buck Controller

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NCP5211A

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ELECTRICAL CHARACTERISTICS (continued) (−40

°C < TA < 85°C; −40°C < TJ < 125°C; 4.5 V < VCC, VC < 14 V;

7.0 V < BST < 20 V; CGATE(H) = CGATE(L) = 3.3 nF; ROSC = 51 k; CCOMP = 0.1 µF, unless otherwise specified.)

Characteristic

Test Conditions

Min

Typ

Max

Unit

GATE(H) and GATE(L)

High Voltage (AC)

GATE(L),

GATE(H)

0.5 nF < CGATE(H) = CGATE(L) < 10 nF

VC − 0.5

BST − 0.5

−

V

Low Voltage (AC)

GATE(L) or GATE(H)

0.5 nF < CGATE(H); CGATE(L) < 10 nF

−

0.5

V

Rise Time

VC = BST = 10 V, Measure:

1.0 V < GATE(L) < 9.0 V,

1.0 V < GATE(H) < 9.0 V

−

40

80

ns

Fall Time

VC = BST = 10 V, Measure:

1.0 V < GATE(L) < 9.0 V,

1.0 V < GATE(H) < 9.0 V

−

40

80

ns

GATE(H) to GATE(L) Delay

GATE(H) < 2.0 V, GATE(L) > 2.0 V

40

70

110

ns

GATE(L) to GATE(H) Delay

GATE(L) < 2.0 V, GATE(H) > 2.0 V

40

70

110

ns

GATE(H)/(L) Pull−Down

Resistance to PGND

20

50

115

k

Ω

Overcurrent Protection

Current Limit Threshold

0 V < IS+ < 4.5 V, 0 V < IS− < 4.5 V

54

60

66

mV

IS+ Bias Current

0 V < IS+ < 4.5 V

−1.0

0.1

1.0

µA

IS− Bias Current

0 V < IS− < 4.5 V

−1.0

0.1

1.0

µA

PWM Comparator

Transient Response

COMP = 0 − 1.5 V, VFFB, 20 mV overdrive

−

100

200

ns

PWM Comparator Offset

VFB = VFFB = 0 V; Increase COMP until

GATE(H) starts switching

0.425

0.475

0.525

V

Artificial Ramp

Duty Cycle = 70% (Note 3)

30

55

80

mV

VFFB Bias Current

VFFB = 0 V

−

0.1

1.0

µA

VFFB Max Input

(Note 3)

1.1

−

V

Minimum Pulse Width

−

200

ns

Oscillator

Switching Frequency

ROSC = 51 k

270

300

330

kHz

ROSC Voltage

−

1.21

1.25

1.29

V

Max Duty Cycle

VCOMP > VFFB + 1.0 V

65

70

75

%

General Electrical Specifications

VCC Supply Current

COMP = 0 V (no switching)

−

7.0

8.3

mA

BST Supply Current

COMP = 0 V (no switching)

−

2.0

3.0

mA

VC Supply Current

COMP = 0 V (no switching)

−

2.0

3.0

mA

Start Threshold

GATE(H) Switching, COMP Charging

4.03

4.18

4.33

V

Stop Threshold

GATE(H) Not Switching, COMP Not Charging

3.89

4.04

4.19

V

Hysteresis

Start−Stop

100

140

180

mV

Sense Ground Current

−

0.15

1.00

mA

3. Guaranteed by design. Not tested in production.

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