Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
MAX1630–MAX1635
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA,
SKIP
= 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.)
PARAMETER
FAULT DETECTION
(MAX1630/MAX1631/MAX1632)
Overvoltage Trip Threshold
Overvoltage-Fault Propagation Delay
Output Undervoltage Threshold
Output Undervoltage Lockout Time
Thermal Shutdown Threshold
RESET
RESET
Trip Threshold
RESET
Propagation Delay
RESET
Delay Time
INPUTS AND OUTPUTS
Feedback Input Leakage Current
Logic Input Low Voltage
Logic Input High Voltage
Input Leakage Current
Logic Output Low Voltage
Logic Output High Current
TIME/ON5 Input Trip Level
TIME/ON5 Source Current
TIME/ON5 On-Resistance
Gate Driver Sink/Source Current
Gate Driver On-Resistance
FB3, FB5; SECFB = 2.6V
RUN/ON3,
SKIP,
TIME/ON5 (SEQ = REF),
SHDN,
STEER, SYNC
RUN/ON3,
SKIP,
TIME/ON5 (SEQ = REF),
SHDN,
STEER, SYNC
RUN/ON3,
SKIP,
TIME/ON5 (SEQ = REF),
SHDN,
STEER, SYNC, SEQ; V
PIN
= 0V or 3.3V
RESET,
I
SINK
= 4mA
RESET
= 3.5V
SEQ = 0V or VL
TIME/ON5 = 0V, SEQ = 0V or VL
TIME/ON5; RUN/ON3 = 0V, SEQ = 0V or VL
DL3, DH3, DL5, DH5; forced to 2V
High or low
1
2.4
2.5
3
15
1
1.5
7
2.6
3.5
80
2.4
±1
0.4
1
50
0.6
nA
V
V
µA
V
mA
V
µA
Ω
A
Ω
With respect to unloaded output voltage,
falling edge; typical hysteresis = 1%
Falling edge, CSL_ driven 2%
below
RESET
trip threshold
With respect to f
OSC
27,000
-7
-5.5
1.5
32,000
37,000
-4
%
µs
clks
With respect to unloaded output voltage
CSL_ driven 2% above overvoltage trip threshold
With respect to unloaded output voltage
From each SMPS enabled, with respect to f
OSC
Typical hysteresis = +10°C
60
5000
4
7
1.5
70
6144
150
80
7000
10
%
µs
%
clks
°C
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Each of the four digital soft-start levels is tested for functionality; the steps are typically in 20mV increments.
Note 2:
High duty-factor operation supports low input-to-output differential voltages, and is achieved at a lowered operating
frequency (see
Overload and Dropout Operation
section).
Note 3:
MAX1630/MAX1632/MAX1633/MAX1635 only.
Note 4:
Off mode for the 12V linear regulator occurs when the SMPS that has flyback feedback (V
DD
) steered to it is disabled. In
situations where the main outputs are being held up by external keep-alive supplies, turning off the 12OUT regulator pre-
vents a leakage path from the output-referred flyback winding, through the rectifier, and into V
DD
.
Note 5:
Since the reference uses VL as its supply, the reference’s V+ line-regulation error is insignificant.
4
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