參數(shù)資料
型號： MAX1977
廠商： Maxim Integrated Products, Inc.
英文描述： High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers
中文描述： 高效率、四路輸出、主電源控制器，用于筆記本電腦
文件頁數(shù)： 5/32頁
文件大?。?/td> 497K
代理商： MAX1977
M
High-Effic ienc y, Quad Output, Main Power-
S upply Controllers for Notebook Computers
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = V
CC
, V
SHDN
= 5V,
T
A
= 0°C to +85°C
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OUT3, OUT5 Discharge-Mode
On-Resistance
12
40
OUT3, OUT5 Discharge-Mode
Synchronous Rectifier
Turn-On Level
0.2
0.3
0.4
V
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = V
CC
, V
SHDN
= 5V,
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MAIN SMPS CONTROLLERS
LDO5 in regulation
V+ = LDO5, V
OUT5
< 4.41V
6
24
5.5
V+ Input Voltage Range
4.5
V
3.3V Output Voltage in
Fixed Mode
V+ = 6V to 24V, FB3 = GND, V
SKIP
= 5V
3.27
3.39
V
V+ = 6V to 24V, FB5 = GND, V
SKIP
= 5V,
MAX1777/MAX1999 (TON = V
CC
)
5V Output Voltage in Fixed Mode
V+ = 7V to 24V, FB5 = GND, V
SKIP
= 5V,
MAX1977/MAX1999 (TON = GND)
4.95
5.15
V
Output Voltage in
Adjustable Mode
V+ = 6V to 24V, either SMPS
1.97
2.03
V
Output Voltage Adjust Range
Either SMPS
2.0
5.5
V
FB3, FB5 Adjustable-Mode
Threshold Voltage
Dual-mode comparator
0.1
0.2
V
Current-Limit Threshold
(Positive, Default)
ILIM_ = V
CC
, GND - CS_ (MAX1777/MAX1977),
GND - LX_ (MAX1999)
90
110
mV
V
ILIM_
= 0.5V
V
ILIM_
= 1V
V
ILIM_
= 2V
V
OUT5
= 5.05V
V
OUT3
= 3.33V
V
OUT5
= 5.05V
V
OUT3
= 3.33V
40
90
180
1.895
0.833
0.895
0.475
200
60
110
220
2.315
1.017
1.209
0.635
400
Current-Limit Threshold
(Positive, Adjustable)
GND - CS_
(MAX1777/MAX1977),
GND - LX_ (MAX1999)
mV
MAX1777 or MAX1999
(V
TON
= 5V)
On-Time Pulse Width
MAX1977 or MAX1999
(V
TON
= 0)
μs
Minimum Off-Time
INTERNAL REGULATOR AND REFERENCE
LDO5 Output Voltage
ns
ON3 = ON5 = GND, 6V < V+ < 24V, 0 < I
LDO5
< 100mA
4.90
5.10
V
LDO5 Undervoltage
Lockout Fault Threshold
Falling edge of LDO5, hysteresis = 1%
3.7
4.3
V
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