Datasheet

MAX8655
Highly Integrated, 25A, Wide-Input,
Internal MOSFET, Step-Down Regulator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, V
BST
- V
LX
= 6.5V, T
A
= -40°C to +85°C, circuit of Figure 4, typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
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.
PVIN, IN, EN to GND ..............................................-0.3V to +30V
BST to LXB ............................................................-0.3V to +7.5V
LX, LXB to GND............ (-2.5V for < 50ns transient) -1V to +30V
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 to VLGND ......................................-0.3V to +0.3V
Operating Junction Temperature Range.......... -40°C to +125°C
Junction Temperature......................................................+150°C
θ
JC
(thermal resistance from
junction to exposed pad) (Note 1) ...............................3.5°C/W
θ
JT
(thermal resistance from junction to the top) ............3.9°C/W
I
LX(RMS)
..................................................................................27A
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
PVIN Operating Voltage Range 3 25 V
IN Operating Voltage Range VL = IN for V
IN
< 7V 4.5 25.0 V
IN 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
PVIN Shutdown Supply Current V
PVIN
= V
LX
= V
BST
1 µA
AVL Undervoltage-Lockout
Threshold
V
AVL
rising, 3% typical 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 6.0 6.5 7.0 V
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
REF
= 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.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.