For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Dropout, Wide-Input-Voltage,
Step-Down Controllers
MAX8597/MAX8598/MAX8599
ABSOLUTE MAXIMUM RATINGS
V+, ILIM to GND .....................................................-0.3V to +30V
AVL, VL to GND........................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
FB, EN, POK, AIN-, AIN+, REFIN to GND ................-0.3V to +6V
AOUT, REFOUT, FREQ, SS, COMP to
GND .....................................................-0.3V to (V
AVL
+ 0.3V)
BST to GND ............................................................-0.3V to +36V
DH to LX ....................................................-0.3V to (V
BST
+ 0.3V)
LX to GND ........................-2V (-2.5V for less than 50ns) to +30V
LX to BST..................................................................-6V to +0.3V
DL to PGND.................................................-0.3V to (V
VL
+ 0.3V)
Continuous Power Dissipation
16- or 20-Pin Thin QFN
Up to +70°C (derate 16.9mW/°C above +70°C)........1349mW
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
(V
V+
= V
VL
= V
AVL
= V
EN
= V
REFIN
= 5V, V
BST
= 6V, V
LX
= 1V, C
VL
= 4.7µF, C
REFOUT
= 1µF, V
AIN-
= V
AOUT
, V
AIN+
= 2.5V, V
ILIM
=
V
LX
- 0.2V, V
FB
= 0.65V, GND = PGND = 0V, C
SS
= 0.01µF, R
FREQ
= 20kΩ,
T
A
= 0°C to +85°C,
typical values are at T
A
= +25°C,
unless otherwise noted.)
PARAMETER
GENERAL
V+ Operating Range
V+/VL Operating Range
V+ Operating Supply Current
V+ Standby Supply Current
VL REGULATOR
Output Voltage
VL Undervoltage-Lockout
Trip Level
Thermal Shutdown
REFERENCE (MAX8597 only)
REFOUT Output Voltage
REFOUT Load Regulation
REFOUT Internal Discharge
Switch On-Resistance
ILIM Sink Current
Comparator Input Offset
Voltage Error
SOFT-START
Soft-Start Source Current
Soft-Start Sink Current
FREQUENCY
R
FREQ
= 100kΩ
Frequency
R
FREQ
= 20.0kΩ
R
FREQ
= 14.3kΩ
150
800
1100
200
1000
1400
240
1200
1700
kHz
V
SS
= 100mV
V
SS
= (0.6V or V
REFIN
)
3
3
5
5
7
7
µA
µA
I
REFOUT
= 150µA, V
V+
= V
VL
= 4.5V or 5.5V
I
REFOUT
= 10µA to 1mA
During VL UVLO
15
2.49
2.50
2.51
10
V
mV
Ω
5.5V < V
V+
< 28V, 1mA < I
LOAD
< 35mA
Rising edge, typical hysteresis = 460mV
Rising temperature, typical hysteresis = 10°C
4.7
4.05
5.0
4.2
+160
5.3
4.35
V
V
°C
V+ = VL
V
V+
= 12V, VL unloaded, no MOSFETs connected, V
FB
= 0V
V
V+
= 12V, VL unloaded, V
FB
= 0V
5.5
4.5
3.4
2.0
28.0
5.5
5.0
V
V
mA
mA
CONDITIONS
MIN
TYP
MAX
UNITS
CURRENT-LIMIT COMPARATOR (all current limits are tested at V
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