參數(shù)資料
型號： MAX1902
廠商： Maxim Integrated Products, Inc.
英文描述： 500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers
中文描述： 500kHz、多路輸出、低噪聲、電源控制器，用于筆記本電腦
文件頁數(shù)： 6/33頁
文件大?。?/td> 649K
代理商： MAX1902
M
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
6
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, both PWMs on, SYNC = V
L
, V
L
load = 0, REF load = 0,
SKIP
= 0,
T
A
= -40
°
C to +85
°
C
, unless otherwise noted.) (Note 7)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V+ Standby Supply Current
V+ = 5.5V to 30V, both SMPSs off, includes
current into
SHDN
60
μA
V+ Standby Supply Current in Dropout
V+ = 4.2V to 5.5V, both SMPSs off, includes
current into
SHDN
200
μA
V+ Shutdown Supply Current
V+ = 4.0V to 30V,
SHDN
= 0
10
μA
(Note 3)
4
Quiescent Power Consumption
Both SMPSs enabled,
FB3 = FB5 = 0,
CSL3 = CSH3 = 3.5V,
CSL5 = CSH5 = 5.3V
MAX1901/MAX1904
4
mW
FAULT DETECTION
(MAX1901/MAX1902)
Overvoltage Trip Threshold
Output Undervoltage Threshold
With respect to unloaded output voltage
With respect to unloaded output voltage
4
60
10
80
%
%
Output Undervoltage Lockout Time
From each SMPS enabled, with respect to
f
OSC
5,000
7,000
clks
RESET
RESET
Trip Threshold
With respect to unloaded output voltage,
falling edge; typical hysteresis = 1%
-7
-4
RESET
Delay Time
INPUTS AND OUTPUTS
Feedback-Input Leakage Current
With respect to f
OSC
27,000
37,000
%
clks
FB3, FB5; SECFB = 2.6V
50
nA
Logic Input-Low Voltage
RUN/ON3,
SKIP
, TIME/ON5 (SEQ = REF),
SHDN
, STEER, SYNC
0.6
V
Logic Input-High Voltage
RUN/ON3,
SKIP
, TIME/ON5 (SEQ = REF),
SHDN
, STEER, SYNC
2.4
V
Logic Output-Low Voltage
Logic Output-High Current
TIME/ON5 Input Trip Level
TIME/ON5 Source Current
TIME/ON5 On-Resistance
RESET
, I
SINK
= 4mA
RESET
= 3.5V
SEQ = 0 or V
L
TIME/ON5 = 0, SEQ = 0 or V
L
TIME/ON5; RUN/ON3 = 0, SEQ = 0 or V
L
0.4
V
1
mA
V
μA
2.4
2.5
2.6
3.5
80
7
8
SSOP package
QFN package
Gate-Driver On-Resistance
High or low (Note 6)
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 the
Dropout Operation
section).
Note 3:
MAX1902 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 situa-
tions where the main outputs are being held up by external keep-alive supplies, turning off the 12OUT regulator prevents a leak-
age path from the output-referred flyback winding, through the rectifier, and into V
DD
.
Note 5:
Since the reference uses V
L
as its supply, the reference
’
s V+ line-regulation error is insignificant.
Note 6:
Production testing limitations due to package handing require relaxed maximum on-resistance specifications for the thin
QFN package. The SSOP and thin QFN package contain the same die, and the thin QFN package imposes no additional
resistance incircuit.
Note 7:
Specifications from to 0
°
C to -40
°
C are guaranteed by design, not production tested.
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