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CS5211

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ELECTRICAL CHARACTERISTICS (−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 mF, unless otherwise specified.) (Note 2)

Characteristic

Test Conditions

Min

Typ

Max

Unit

Error Amplifier

VFB Bias Current

VFB = 0 V

−

0.1

1.0

COMP Source Current

VFB = 0.8 V

COMP SINK Current

VFB = 1.2 V

Open Loop Gain

−

Unity Gain Bandwidth

C = 0.1 mF

−

kHz

PSRR @ 1.0 kHz

−

Output Transconductance

−

mmho

Output Impedance

−

2.5

−

Reference Voltage

−0.1 V < SGND < 0.1 V, COMP = VFB, Measure VFB to SGND

0.977

0.992

1.007

COMP Max Voltage

VFB = 0.8 V

2.5

3.0

−

COMP Min Voltage

VFB = 1.2 V

−

0.1

0.2

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

−

Low Voltage (AC)

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

−

0.5

Rise Time

VC = BST = 10 V, Measure:

1.0 V < GATE(L) < 9.0 V, 1.0 V < GATE(H) < 9.0 V

−

Fall Time

VC = BST = 10 V, Measure:

1.0 V < GATE(L) < 9.0 V, 1.0 V < GATE(H) < 9.0 V

−

GATE(H) to GATE(L) Delay

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

110

GATE(L) to GATE(H) Delay

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

110

GATE(H)/(L) Pull−Down

Resistance to PGND

115

Overcurrent Protection

OVC Comparator Offset Voltage

0 V < IS+ < VCC, 0 V < IS− < VCC

IS+ Bias Current

0 V < IS+ < VCC

−1.0

0.1

1.0

IS− Bias Current

0 V < IS− < VCC

−1.0

0.1

1.0

COMP Discharge Threshold

−

0.20

0.25

0.30

COMP Discharge Current in

OVC Fault Mode

COMP = 1.0 V

2.0

5.0

8.0

PWM Comparator

Transient Response

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

−

100

200

PWM Comparator Offset

VFB = VFFB = 0 V; Increase COMP until GATE(H) starts switching

0.425

0.475

0.525

Artificial Ramp

Duty Cycle = 90%

100

VFFB Bias Current

VFFB = 0 V

−

0.1

1.0

VFFB Input Range

(Note 4)

−

1.1

Minimum Pulse Width

−

200

Oscillator

Switching Frequency

ROSC = 18 k

600

750

900

kHz

Switching Frequency

ROSC = 51 k

240

300

360

kHz

Switching Frequency

ROSC = 115 kW

120

150

180

kHz

ROSC Voltage

−

1.21

1.25

1.29

2. Guaranteed by design. Not tested in production.

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