Datasheet

MAX8597/MAX8598/MAX8599
Low-Dropout, Wide-Input-Voltage,
Step-Down Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.)
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.
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
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
V+ Operating Range 5.5 28.0 V
V+/VL Operating Range V+ = VL 4.5 5.5 V
V+ Operating Supply Current V
V+
= 12V, VL unloaded, no MOSFETs connected, V
FB
= 0V 3.4 5.0 mA
V+ Standby Supply Current V
V+
= 12V, VL unloaded, V
FB
= 0V 2.0 mA
VL REGULATOR
Output Voltage 5.5V < V
V+
< 28V, 1mA < I
LOAD
< 35mA 4.7 5.0 5.3 V
VL Undervoltage-Lockout
Trip Level
Rising edge, typical hysteresis = 460mV 4.05 4.2 4.35 V
Thermal Shutdown Rising temperature, typical hysteresis = 10°C +160 °C
REFERENCE (MAX8597 only)
REFOUT Output Voltage I
REFOUT
= 150µA, V
V+
= V
VL
= 4.5V or 5.5V 2.49 2.50 2.51 V
REFOUT Load Regulation I
REFOUT
= 10µA to 1mA 10 mV
REFOUT Internal Discharge
Switch On-Resistance
During VL UVLO 15 Ω
CURRENT-LIMIT COMPARATOR (all current limits are tested at V
V+
= V
VL
= 4.5V and 5.5V)
ILIM Sink Current 1.8V < V
LX
< 28V, V
BST
= V
LX
+ 5V 180 200 220 µA
Comparator Input Offset
Voltage Error
V
LX
= 28V, V
BST
= V
LX
+ 5V -10 +10 mV
SOFT-START
Soft-Start Source Current V
SS
= 100mV 3 5 7 µA
Soft-Start Sink Current V
SS
= (0.6V or V
REFIN
) 3 5 7 µA
FREQUENCY
R
FREQ
= 100kΩ 150 200 240
R
FREQ
= 20.0kΩ 800 1000 1200Frequency
R
FREQ
= 14.3kΩ 1100 1400 1700
kHz