Datasheet

MAX8650
4.5V to 28V Input Current-Mode Step-Down
Controller with Adjustable Frequency
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, V
BST
- V
LX
= 6.5V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
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.
IN, EN to GND ........................................................-0.3V to +30V
BST to LX...............................................................-0.3V to +7.5V
DH to LX ....................................................-0.3V to (V
BST
+ 0.3V)
LX to GND .................... -1V (-2.5V for < 50ns transient) to +30V
DL to PGND.................................................-0.3V to (V
VL
+ 0.3V)
ILIM2, ILIM1, SYNCO, FSYNC, OVP,
SCOMP to GND .....................................-0.3V to (V
AVL
+ 0.3V)
VL to PGND ...........................................................-0.3V to +7.5V
AVL, FB, POK, COMP, SS, MODE, REFIN to GND .....-0.3V to +6V
CS+, CS- to GND .....................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
24-Pin QSOP (derate 9.5mW/°C above +70°C)..........762mW
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Input Voltage Range VL = IN for V
IN
< 7V 4.5 28.0 V
Quiescent Supply Current V
FB
= 0.75V, no switching 2 3 mA
EN = GND, V
IN
≤ 28V 10
Shutdown Supply Current
I
IN
+ I
VL
+ I
AVL EN = GND, V
AVL
= V
VL
= V
IN
= 5V 32
µA
AVL Undervoltage-Lockout Trip
Level
V
AVL
rising, 3% typ hysteresis 3.90 4.15 4.40 V
Output Voltage Adjust Range
Minimum output voltage is limited by minimum duty cycle
and external components
0.7 5.5 V
VL Regulation Voltage 7V < V
IN
< 28V, 1mA < I
LOAD
< 40mA 6.0 6.5 7.0 V
VL Output Current 40 mA
AVL Regulation Voltage 5.5V < V
VL
< 7V, 1mA < I
LOAD
< 10mA 4.900 4.975 5.050 V
AVL Output Current 10 mA
SOFT-START
SS Shutdown Resistance From SS to GND, V
EN
= 0V 20 100 Ω
SS Soft-Start Current V
SS
= 0.625V 18 23 28 µA
REFIN INPUT
REFIN Dual Mode™ Threshold
V
AVL
-
1.0V
V
AVL
V
REFIN Input Bias Current V
REFIN
= 0.7V to 1.5V -250 +250 nA
REFIN Input Voltage Range 0 1.5 V
Dual Mode is a trademark of Maxim Integrated Products, Inc.