Electrical characteristics – Rainbow Electronics MAX8742 User Manual
Page 5
MAX8741/
M
AX8742
500kHz Multi-Output Power-Supply Controllers
with High Impedance in Shutdown
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS
(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 6)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MAIN SMPS CONTROLLERS
Input Voltage Range
4.2
30.0
V
3V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH3 - CSL3 = 0,
CSL3 connected to FB3
2.42
2.58
V
3V Output Voltage in Fixed Mode
V+ = 4.2V to 30V, 0 < CSH3 - CSL3
< 80mV, FB3 = 0
3.20
3.47
V
5V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH5 - CSL5 = 0,
CSL5 connected to FB5
2.42
2.58
V
5V Output Voltage in Fixed Mode
V+ = 5.3V to 30V, 0 < CSH5 - CSL5
< 80mV, FB5 = 0
4.85
5.25
V
Output Voltage Adjust Range
Either SMPS
REF
5.5
V
Adjustable-Mode Threshold Voltage
Dual-mode comparator
0.5
1.1
V
CSH3 - CSL3 or CSH5 - CSL5
80
120
Current-Limit Threshold
SKIP = V
L
or V
DD
< 13V or SECFB < 2.44V
-50
-150
mV
SYNC = V
L
450
550
Oscillator Frequency
SYNC = 0
283
383
kHz
SYNC = V
L
95
Maximum Duty Factor
SYNC = 0 (Note 2)
97
%
SYNC Input Frequency Range
400
583
kHz
FLYBACK CONTROLLER
V
DD
Regulation Threshold
Falling edge (MAX8742)
13
14
V
SECFB Regulation Threshold
Falling edge (MAX8741)
2.44
2.60
V
V
DD
Shunt Threshold
Rising edge, hysteresis = 1% (MAX8742)
18
20
V
V
DD
Shunt Sink Current
V
DD
= 20V (MAX8742)
10
mA
12V LINEAR REGULATOR
(MAX8742)
12OUT Output Voltage
13V < V
DD
< 18V, 0mA < I
LOAD
< 100mA
11.65
12.50
V
Quiescent V
DD
Current
V
DD
= 18V, run mode, no 12OUT load
100
µA
INTERNAL REGULATOR AND REFERENCE
V
L
Output Voltage
SHDN = V+, RUN/ON3 = TIME/ON5 = 0,
5.4V < V+ < 30V, 0 < I
LOAD
< 50mA
4.7
5.1
V
V
L
Undervoltage-Lockout Fault Threshold
Falling edge, hysteresis = 1%
3.5
3.7
V
V
L
Switchover Threshold
Rising edge of CSL5, hysteresis = 1%
4.2
4.7
V
REF Output Voltage
No external load (Note 4)
2.45
2.55
V
0 < I
LOAD
< 50µA
12.5
REF Load Regulation
0 < I
LOAD
< 5mA
100.0
mV
REF Sink Current
10
µA
REF Fault-Lockout Voltage
Falling edge
1.8
2.4
V
V+ Operating Supply Current
V
L
switched over to CSL5, 5V SMPS on
50
µA