Rainbow Electronics MAX786 - Manual (Page 3)

MAX786
Dual-Output Power-Supply
Controller for Notebook Computers
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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 µA
Q1, Q2 Sink Current VH = 15V, V
OUT
= 2.5V 200 500 1000 µA
Q1, Q2 Output High Voltage I
SOURCE
= 5µA, VH = 3V VH - 0 .5 V
Q1, Q2 Output Low Voltage I
SINK
= 20µA, VH = 3V 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 SHDN, ON3, ON5 V
IN
= 0V, 5V ±1 µA
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
Ω
DH3/DH5 On-Resistance High or low, BST3-LX3 = BST5-LX5 = 4.5V 7
Ω
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.)