Dual-Output Power-Supply
Controller for Notebook Computers
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.)
PARAMETER
Q1, Q2 Source Current
Q1, Q2 Sink Current
Q1, Q2 Output High Voltage
Q1, Q2 Output Low Voltage
Quiescent VH Current
CONDITIONS
VH = 15V, V
OUT
= 2.5V
VH = 15V, V
OUT
= 2.5V
I
SOURCE
= 5µA, VH = 3V
I
SINK
= 20µA, VH = 3V
VH = 18V, D1 = D2 = 5V, no external load
SYNC = 3.3V
SYNC = 0V, 5V
SYNC High Pulse Width
SYNC Low Pulse Width
SYNC Rise/Fall Time
Oscillator SYNC Range
Maximum Duty Cycle
Input Low Voltage
Input High Voltage
Input Current
DL3/DL5 Sink/Source Current
DH3/DH5 Sink/Source Current
DL3/DL5 On-Resistance
DH3/DH5 On-Resistance
SYNC = 3.3V
SYNC = 0V or 5V
SHDN, ON3, ON5, SYNC
SHDN, ON3, ON5
SYNC
SHDN, ON3, ON5 V
IN
= 0V, 5V
V
OUT
= 2V
BST3-LX3 = BST5-LX5 = 4.5V, V
OUT
= 2V
High or low
High or low, BST3-LX3 = BST5-LX5 = 4.5V
1
1
7
7
2.4
VL - 0 .5
±1
µA
A
A
Ω
Ω
Not tested
240
89
92
92
95
0.8
V
V
270
170
200
200
200
350
4
300
200
MIN
12
200
VH - 0 .5
0.4
10
330
230
ns
ns
ns
kHz
%
TYP
20
500
MAX
30
1000
UNITS
µA
µA
V
V
µA
MAX786
OSCILLATOR AND INPUTS/OUTPUTS
Oscillator Frequency
kHz
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.
_________________________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
