Dual-Output Power-Supply
Controller for Notebook Computers
_________________________________________________________________________________________________ 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
to the closed-loop gain (AV
CL
) and the reference voltage load-regulation error. AV
CL
for the +3.3V supply is unity gain.
AV
CL
for the +5V supply is 1.54.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Q1, Q2 Source Current
VH = 15V, V
OUT
= 2.5V
12 20 30 礎
Q1, Q2 Sink Current
VH = 15V, V
OUT
= 2.5V
200 500 1000 礎
Q1, Q2 Output High Voltage I
SOURCE
= 5礎, VH = 3V
VH -0.5
V
Q1, Q2 Output Low Voltage I
SINK
= 20礎, VH = 3V
0.4 V
Quiescent VH Current
VH = 18V, D1 = D2 = 5V, no external load
4 10 礎
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
SHDN
, ON3, ON5 V
IN
= 0V, 5V
? 礎
DL3/DL5 Sink/Source Current V
OUT
= 2V
1
A
DH3/DH5 Sink/Source Current BST3-LX3 = BST5-LX5 = 4.5V, V
OUT
= 2V
1
A
DL3/DL5 On-Resistance
High or low
7 &
DH3/DH5 On-Resistance
High or low, BST3-LX3 = BST5-LX5 = 4.5V
7 &
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, GND = PGND = 0V, I
VL
= I
REF
= 0mA, SHDN
= ON3 = ON5 = 5V, other digital input levels are 0V or +5V,
T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
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