MAX8732A Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8732A
Maxim Integrated
MAX8732A Datasheet PDF : 33 Pages
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High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, V SHDN = 5V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MAX8732A or MAX8734A
(VTON = 5V), SKIP = VCC
5V SMPS
3.3V SMPS
Operating Frequency
MAX8733A or MAX8734A
(VTON = 0), SKIP = VCC
5V SMPS
3.3V SMPS
SKIP = REF
On-Time Pulse Width
Minimum Off-Time
MAX8732A or MAX8734A
(VTON = 5V)
MAX8733A or MAX8734A
(VTON = 0)
VOUT5 = 5.05V
VOUT3 = 3.33V
VOUT5 = 5.05V
VOUT3 = 3.33V
MAX8732A or MAX8734A VOUT5 = 5.05V
Maximum Duty Cycle
(VTON = 5V)
MAX8733A or MAX8734A
(VTON = 0)
VOUT3 = 3.33V
VOUT5 = 5.05V
VOUT3 = 3.33V
INTERNAL REGULATOR AND REFERENCE
LDO5 Output Voltage
ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO5 < 100mA
LDO5 Short-Circuit Current
LDO5 = GND
LDO5 Undervoltage-Lockout
Fault Threshold
Falling edge of LDO5, hysteresis = 1%
MIN
25
1.895
0.833
0.895
0.475
250
TYP
200
300
400
500
36
2.105
0.925
1.052
0.555
300
94
91
88
85
MAX
2.315
1.017
1.209
0.635
350
UNITS
kHz
µs
ns
%
4.90 5.00 5.10
V
190
mA
3.7
4.0
4.3
V
LDO5 Bootstrap Switch Threshold
Falling edge of OUT5, rising edge at OUT5 regulation
point
4.43 4.56 4.69
V
LDO5 Bootstrap
Switch Resistance
LDO5 to OUT5, VOUT5 = 5V
1.4
3.2
Ω
LDO3 Output Voltage
LDO3 Short-Circuit Current
ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO3 < 100mA 3.28 3.35 3.42
V
LDO3 = GND
180
mA
LDO3 Bootstrap Switch Threshold Falling edge of OUT3, rising edge at OUT3 regulation
point
2.80 2.91 3.02
V
LDO3 Bootstrap Switch
Resistance
LDO3 to OUT3, VOUT3 = 3.2V
1.5
3.5
Ω
REF Output Voltage
REF Load Regulation
REF Sink Current
V+ Operating Supply Current
V+ Standby Supply Current
V+ Shutdown Supply Current
Quiescent Power Consumption
FAULT DETECTION
Overvoltage Trip Threshold
No external load
0 < ILOAD < 50µA
REF in regulation
LDO5 switched over to OUT5, 5V SMPS
V+ = 6V to 24V, both SMPSs off, includes ISHDN
V+ = 4.5V to 24V
Both SMPSs on, FB3 = FB5 = SKIP = GND, VOUT3 =
3.5V, VOUT5 = 5.3V
FB3 or FB5 with respect to nominal regulation point
1.980 2.000 2.020
V
10
mV
10
µA
25
50
µA
150
250
µA
6
15
µA
3
4.5
mW
+8
+11 +14
%
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