EVALUATION KIT AVAILABLE
MAX5090A/B/C 2A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converters
General Description Features
The MAX5090A/B/C easy-to-use, high-efficiency, high- Wide Input Voltage Range: 6.5V to 76V
voltage step-down DC-DC converters operate from an input
Fixed (3.3V, 5V) and Adjustable (1.265V to 11V)
voltage up to 76V, and consume only 310A quiescent
Output-Voltage Versions
current at no load. This pulse-width-modulated (PWM)
2A Output Current
converter operates at a fixed 127kHz switching frequency at
Efficiency Up to 92%
heavy loads, and automatically switches to pulse-skipping
mode to provide low quiescent current and high efficiency Internal 0.26 High-Side DMOS FET
at light loads. The MAX5090 includes internal frequency
310A Quiescent Current at No Load
compensation simplifying circuit implementation. The
19A Shutdown Current
device can also be synchronized with external system clock
Internal Frequency Compensation
frequency in a noise-sensitive application. The MAX5090
uses an internal low on-resistance and a high-voltage DMOS Fixed 127kHz Switching Frequency
transistor to obtain high efficiency and reduce overall system
External Frequency Synchronization
cost. This device includes undervoltage lockout, cycle-
Thermal Shutdown and Short-Circuit Current Limit
by-cycle current limit, hiccup-mode output short-circuit
-40C to +125C Automotive Temperature Range
protection, and overtemperature shutdown.
6-Pin (5mm x 5mm) Thin QFN Package
The MAX5090 delivers up to 2A output current. External
shutdown is included, featuring 19A (typ) shutdown
Capable of Dissipating 2.67W at +70C
current. The MAX5090A/MAX5090B versions have fixed
output voltages of 3.3V and 5V, respectively, while the
Ordering Information
MAX5090C features an adjustable 1.265V to 11V output
OUTPUT
voltage. TEMP PIN-
PART VOLTAGE
RANGE PACKAGE
(V)
The MAX5090 is available in a space-saving 16-pin
thin QFN package (5mm x 5mm) and operates over the
MAX5090AATE+ -40C to +125C 16 TQFN-EP* 3.3
automotive temperature range (-40C to +125C).
MAX5090AATE -40C to +125C 16 TQFN-EP* 3.3
MAX5090BATE+ -40C to +125C 16 TQFN-EP* 5.0
Applications
MAX5090BATE -40C to +125C 16 TQFN-EP* 5.0
Industrial
+Denotes a lead(Pb)-free/RoHS-compliant package.
Distributed Power
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Typical Operating Circuit
Pin Configuration
V
IN
TOP VIEW
7.5V TO 76V
R
IN
12 11 10 9
10
C
IN
C
BYPASS
68F
0.47F
V
OUT
DRAIN 13 EP 8 FB
100H
V DRAIN 5V/2A
IN
LX
DRAIN 14 7 SS
ON/OFF C
BST COUT
D1
MA5090
0.22F 100F
PDS5100H
MAX5090B
N.C. 15 6 SYNC
BST
FB
VD
N.C. 16 5
SS
SYNC
CSS
0.047F
VD
1 2 3 4
SGND PGND
3.3F
TQFN
19-3872; Rev 1; 9/14
LX PGND
LX N.C.
BST SGND
V ON/OFF
INMAX5090A/B/C 2A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converters
Absolute Maximum Ratings
(Voltages referenced to PGND, unless otherwise specified.) V Short-Circuit Duration ......................................Continuous
OUT
V , DRAIN ............................................................-0.3V to +80V VD Short-Circuit Duration ..........................................Continuous
IN
SGND, PGND. ......................................................-0.3V to +0.3V Continuous Power Dissipation (T = +70C)*
A
LX ...............................................................-0.8V to (V + 0.3V) 16-Pin TQFN (derate 33.3mW/C above +70C) ........2.667W
IN
BST ..............................................................-0.3V to (V + 10V) Operating Junction Temperature Range ...... -40C to +125C
IN
BST to LX ..............................................................-0.3V to +10V Storage Temperature Range ........................ -65C to +150C
ON/OFF ......................................................-0.3V to (V + 0.3V) Junction Temperature ..................................................+150C
IN
VD, SYNC .............................................................-0.3V to +12V Lead Temperature (soldering, 10s) .............................+300C
SS .............................................................................. -0.3 to +4V
FB
*As per JEDEC 51 Standard Multilayer Board.
MAX5090A/MAX5090B .....................................-0.3V to +15V
MAX5090C ................ 1mA (internally clamped to +2V, -0.3V)
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 = +12V, V = +12V, V = 0V, I = 0, T = T = -40C to +125C, unless otherwise noted. Typical values are at
IN ON/OFF SYNC OUT A J
T = +25C. See the Typical Operating Circuit.) (Note 1)
A
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V 6.5 76.0 V
IN
Undervoltage Lockout UVLO V rising 5.70 6.17 6.45 V
IN
UVLO Hysteresis UVLO 0.5 V
HYS
MAX5090A V = 6.5V to 76V, I = 0 to 2A 3.20 3.3 3.39
IN OUT
Output Voltage V MAX5090B V = 7.5V to 76V, I = 0 to 2A 4.85 5.0 5.15 V
OUT IN OUT
MAX5090B V = 7V to 76V, I = 0 to 1A 4.85 5.0 5.15
IN OUT
Output Voltage Range V MAX5090C only 1.265 11.000 V
OUT
Feedback Voltage V MAX5090C, V = 6.5V to 76V 1.191 1.228 1.265 V
FB IN
MAX5090A V = 12V, I = 1A 80
IN OUT
Efficiency MAX5090B V = 12V, I = 1A 88 %
IN OUT
MAX5090C V = 12V, V = 5V, I = 1A 88
IN OUT OUT
MAX5090A V = 6.5V to 28V 310 550
IN
Quiescent Supply Current
I MAX5090B V = 7V to 28V 310 550 A
Q IN
(Note 2)
MAX5090C V = 6.5V to 28V 310 550
IN
MAX5090A V = 6.5V to 40V 310 570
IN
Quiescent Supply Current
I MAX5090B V = 7V to 40V 310 570 A
Q IN
(Note 2)
MAX5090C V = 6.5V to 40V 310 570
IN
MAX5090A V = 6.5V to 76V 310 650
IN
Quiescent Supply Current
I MAX5090B V = 7V to 76V 310 650 A
Q IN
(Note 2)
MAX5090C V = 6.5V to 76V 310 650
IN
Shutdown Current I V = 0V, V = 14V 19 45 A
SHDN ON/OFF IN
SOFT-START
Default Internal Soft-Start
C = 0 700 s
SS
Period
Soft-Start Charge Current I 4.5 10 16.0 A
SS
Soft-Start ReferenceVoltage V 1.23 1.46 1.65 V
SS(REF)
Maxim Integrated 2
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