ABSOLUTE MAXIMUM RATINGS
V+,
SHDN
to GND ..................................................-0.3V to +25V
BST_ to GND ..........................................................-0.3V to +30V
LX_ to BST_ ..............................................................-6V to +0.3V
CS_ to GND (MAX8732A/MAX8733A only) .................-2V to +6V
V
CC
, LDO5, LDO3, OUT3, OUT5, ON3, ON5, REF,
FB3, FB5,
SKIP, PRO,
PGOOD to GND ...............-0.3V to +6V
DH3 to LX3 ..............................................-0.3V to (V
BST3
+ 0.3V)
DH5 to LX5 ..............................................-0.3V to (V
BST5
+ 0.3V)
ILIM3, ILIM5 to GND...................................-0.3V to (V
CC
+ 0.3V)
DL3, DL5 to GND....................................-0.3V to (V
LDO5
+ 0.3V)
TON to GND (MAX8734A only) ................................-0.3V to +6V
LDO3, LDO5, REF Short Circuit to GND ....................Momentary
LDO3 Current (internal regulator) Continuous................+100mA
LDO3 Current (switched over to OUT3) Continuous ......+200mA
LDO5 Current (internal regulator) Continuous................+100mA
LDO5 Current (switched over to OUT5) Continuous ......+200mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
MAIN SMPS CONTROLLERS
V+ Input Voltage Range
3.3V Output Voltage in
Fixed Mode
LDO5 in regulation
V+ = LDO5, V
OUT5
< 4.43V
V+ = 6V to 24V, FB3 = GND, V
SKIP
= 5V
V+ = 6V to 24V, FB5 = GND, V
SKIP
= 5V,
MAX8732A/MAX8734A (TON = V
CC
)
V+ = 7V to 24V, FB5 = GND, V
SKIP
= 5V,
MAX8733A/MAX8734A (TON = GND)
Output Voltage in
Adjustable Mode
Output Voltage Adjust Range
FB3, FB5 Adjustable-Mode
Threshold Voltage
DC Load Regulation
Line Regulation
Current-Limit Threshold
(Positive, Default)
Current-Limit Threshold
(Positive, Adjustable)
Zero-Current Threshold
Current-Limit Threshold
(Negative, Default)
Soft-Start Ramp Time
V+ = 6V to 24V, either SMPS
Either SMPS
Dual-Mode comparator
Either SMPS, V
SKIP
= 5V, 0 to 5A
Either SMPS,
SKIP
= GND, 0 to 5A
Either SMPS, V
SKIP
= 2V, 0 to 5A
Either SMPS, 6V < V+ < 24V
ILIM_ = V
CC
, GND - CS_ (MAX8732A/MAX8733A),
GND - LX_ (MAX8734A)
GND - CS_
(MAX8732A/MAX8733A),
GND - LX_ (MAX8734A)
V
ILIM_
= 0.5V
V
ILIM_
= 1V
V
ILIM_
= 2V
93
40
93
185
1.975
2.0
0.1
-0.1
-1.5
-1.7
0.005
100
50
100
200
3
-120
1.7
107
60
107
215
mV
mV
ms
mV
%/V
mV
%
2.00
2.025
5.5
0.2
V
V
V
6
4.5
3.285
3.330
24
5.5
3.375
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
5V Output Voltage in Fixed Mode
4.975
5.050
5.125
V
SKIP
= GND, ILIM_ = V
CC
, GND - CS_
(MAX8732A/MAX8733A), GND - LX_ (MAX8734A)
SKIP
= ILIM_ = V
CC
, GND - CS_
(MAX8732A/MAX8733A), GND - LX_ (MAX8734A)
Zero to full limit
2
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
