High-Voltage, Step-Down Controller with

Synchronous Rectifier for CPU Power

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3

ELECTRICAL CHARACTERISTICS (continued)

SHDN, 0V or 30V

SHDN, SKIP

SYNC

SYNC = 0V or 5V

No external load (Note 1)

SYNC = REF

Guaranteed by design

CSH = CSL = 6V

V+ = 4V, CSL = 0V (Note 2)

SYNC = 0V or 5V

SHDN = 0V, V+ = 30V, CSL = 0V or 6V

Falling edge

SYNC = REF

SHDN = 0V, CSL = 6V, V+ = 0V or 30V, VL = 0V

CONDITIONS

2.0

2.0

V

VL - 0.5

Input High Voltage

%

93

96

89

91

Maximum Duty Factor

kHz

190

340

Oscillator Sync Range

ns

200

SYNC Rise/Fall Time

ns

200

SYNC Low Pulse Width

ns

200

SYNC High Pulse Width

125

150

175

kHz

270

300

330

Oscillator Frequency

2.45

2.505

2.55

V

Reference Output Voltage

mW

4.8

6.6

Quiescent Power Consumption

mW

4

8

Dropout Power Consumption

1

5

µA

V+ Shutdown Current

V

1.8

2.3

Reference Fault Lockout Voltage

mV

50

Reference Load Regulation

µA

0.1

1

CSL Shutdown Leakage Current

UNITS

MIN

TYP

MAX

PARAMETER

FB = CSH = CSL = 6V, VL switched over to CSL

1

5

µA

V+ Off-State Leakage Current

DL forced to 2V

FB, FB = REF

CSH, CSL, CSH = CSL = 4V, device not shut down

SYNC, SKIP

A

1

DL Sink/Source Current

±100

50

1.0

SHDN, SKIP

SYNC

0.5

V

0.8

Input Low Voltage

DH forced to 2V, BST - LX = 4.5V

A

1

DH Sink/Source Current

High or low, BST - LX = 4.5V

High or low

Ω

7

DH On-Resistance

Ω

7

DL On-Resistance

OSCILLATOR AND INPUTS/OUTPUTS

nA

Input Current

µA