500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, both PWMs on, SYNC = V
L
, V
L
load = 0, REF load = 0,
SKIP
= 0,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
Maximum Duty Factor
SYNC Input High-Pulse Width
SYNC Input Low-Pulse Width
SYNC Rise/Fall Time
SYNC Input Frequency Range
Current-Sense Input Leakage Current
FLYBACK CONTROLLER
V
DD
Regulation Threshold
SECFB Regulation Threshold
DL Pulse Width
V
DD
Shunt Threshold
V
DD
Shunt Sink Current
V
DD
Leakage Current
12V LINEAR REGULATOR
(Note 3)
12OUT Output Voltage
12OUT Current Limit
Quiescent V
DD
Current
INTERNAL REGULATOR AND REFERENCE
V
L
Output Voltage
V
L
Undervoltage Lockout-Fault Threshold
V
L
Switchover Threshold
REF Output Voltage
REF Load Regulation
REF Sink Current
REF Fault-Lockout Voltage
V+ Operating Supply Current
V+ Standby Supply Current
V+ Standby Supply Current in Dropout
V+ Shutdown Supply Current
Falling edge
V
L
switched over to CSL5, 5V SMPS on
V+ = 5.5V to 30V, both SMPSs off, includes
current into
SHDN
V+ = 4.2V to 5.5V, both SMPSs off, includes
current into
SHDN
V+ = 4.0V to 30V,
SHDN
= 0
Both SMPSs enabled,
FB3 = FB5 = 0,
CSL3 = CSH3 = 3.5V,
CSL5 = CSH5 = 5.3V
(Note 3)
MAX1901/MAX1904
SHDN
= V+, RUN/ON3 = TIME/ON5 = 0,
5.4V < V+ < 30V, 0mA < I
LOAD
< 50mA
Falling edge, hysteresis = 1%
Rising edge of CSL5, hysteresis = 1%
No external load (Note 5)
0 < I
LOAD
< 50µA
0 < I
LOAD
< 5mA
10
1.8
5
30
50
4
2.5
1.5
2.4
50
60
200
10
4
mW
4
4.7
3.5
4.2
2.45
3.6
4.5
2.5
5.1
3.7
4.7
2.55
12.5
100.0
V
V
V
V
mV
µA
V
µA
µA
µA
µA
13V < V
DD
< 18V, 0 < I
LOAD
< 120mA
12OUT forced to 11V, V
DD
= 13V
V
DD
= 18V, run mode, no 12OUT load
11.65
12.10
150
50
100
12.50
V
mA
µA
Falling edge (Note 3)
Falling edge (MAX1901/MAX1904)
V
DD
< 13V or SECFB < 2.44V
Rising edge, hysteresis = 1% (Note 3)
V
DD
= 20V (Note 3)
V
DD
= 5V, off mode (Notes 3, 4)
18
10
30
13
2.44
0.75
20
14
2.60
V
V
µs
V
mA
µA
V+ = V
L
= 0,
CSL3 = CSH3 = CSL5 = CSH5 = 5.5V
SYNC = V
L
SYNC = 0 (Note 2)
Not tested
Not tested
Not tested
400
0.01
CONDITIONS
MIN
95
96.5
200
200
200
583
10
TYP
97
98
MAX
UNITS
%
ns
ns
ns
kHz
µA
MAX1901/MAX1902/MAX1904
Quiescent Power Consumption
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
