Dual-Output Power-Supply

Controller for Notebook Computers

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3

Note 1: Since the reference uses VL as its supply, its V+ line regulation error is insignificant.

Note 2: The main switching outputs track the reference voltage. Loading the reference reduces the main outputs slightly according

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Q1, Q2 Source Current

12

20

30

µA

Q1, Q2 Sink Current

200

500

1000

µA

Q1, Q2 Output High Voltage

VH -0 .5

V

Q1, Q2 Output Low Voltage

0.4

V

Quiescent VH Current

VH = 18V, D1 = D2 = 5V, no external load

4

10

µA

OSCILLATOR AND INPUTS/OUTPUTS

Oscillator Frequency

SYNC = 3.3V

270

300

330

kHz

SYNC = 0V, 5V

170

200

230

SYNC High Pulse Width

200

ns

SYNC Low Pulse Width

200

ns

SYNC Rise/Fall Time

Not tested

200

ns

Oscillator SYNC Range

240

350

kHz

Maximum Duty Cycle

SYNC = 3.3V

89

92

%

SYNC = 0V or 5V

92

95

Input Low Voltage

SHDN, ON3, ON5, SYNC

0.8

V

Input High Voltage

SHDN, ON3, ON5

2.4

V

SYNC

VL -0 .5

Input Current

±1

µA

DL3/DL5 Sink/Source Current

1

A

DH3/DH5 Sink/Source Current

1

A

DL3/DL5 On-Resistance

High or low

7

Ω

DH3/DH5 On-Resistance

High or low, BST3-LX3 = BST5-LX5 = 4.5V

7

Ω

ELECTRICAL CHARACTERISTICS (continued)