EVALUATION KIT AVAILABLE
MAX5090A/B/C
2A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converters
General Description
Features
● Wide Input Voltage Range: 6.5V to 76V
The MAX5090A/B/C easy-to-use, high-efficiency, high-
voltage step-down DC-DC converters operate from an input
voltage up to 76V, and consume only 310µA quiescent
current at no load. This pulse-width-modulated (PWM)
converter operates at a fixed 127kHz switching frequency at
heavy loads, and automatically switches to pulse-skipping
mode to provide low quiescent current and high efficiency
at light loads. The MAX5090 includes internal frequency
compensation simplifying circuit implementation. The
device can also be synchronized with external system clock
frequency in a noise-sensitive application. The MAX5090
uses an internal low on-resistance and a high-voltage DMOS
transistor to obtain high efficiency and reduce overall system
cost. This device includes undervoltage lockout, cycle-
by-cycle current limit, hiccup-mode output short-circuit
protection, and overtemperature shutdown.
● Fixed (3.3V, 5V) and Adjustable (1.265V to 11V)
Output-Voltage Versions
● 2A Output Current
● Efficiency Up to 92%
● Internal 0.26Ω High-Side DMOS FET
● 310µA Quiescent Current at No Load
● 19µA Shutdown Current
● Internal Frequency Compensation
● Fixed 127kHz Switching Frequency
● External Frequency Synchronization
● Thermal Shutdown and Short-Circuit Current Limit
● -40°C to +125°C Automotive Temperature Range
● 6-Pin (5mm x 5mm) Thin QFN Package
● Capable of Dissipating 2.67W at +70°C
The MAX5090 delivers up to 2A output current. External
shutdown is included, featuring 19µA (typ) shutdown
current. The MAX5090A/MAX5090B versions have fixed
output voltages of 3.3V and 5V, respectively, while the
MAX5090C features an adjustable 1.265V to 11V output
voltage.
Ordering Information
OUTPUT
VOLTAGE
(V)
TEMP
PIN-
PACKAGE
PART
RANGE
The MAX5090 is available in a space-saving 16-pin
thin QFN package (5mm x 5mm) and operates over the
automotive temperature range (-40°C to +125°C).
MAX5090AATE+ -40°C to +125°C 16 TQFN-EP*
3.3
MAX5090AATE -40°C to +125°C 16 TQFN-EP*
MAX5090BATE+ -40°C to +125°C 16 TQFN-EP*
MAX5090BATE -40°C to +125°C 16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
3.3
5.0
5.0
Applications
● Industrial
● Distributed Power
Ordering Information continued at end of data sheet.
Typical Operating Circuit
Pin Configuration
V
IN
7.5V TO 76V
TOP VIEW
R
IN
10Ω
12
11
10
9
C
IN
68µF
C
BYPASS
0.47µF
V
OUT
EP
FB
8
7
6
5
DRAIN 13
DRAIN 14
N.C. 15
100µH
5V/2A
V
DRAIN
IN
LX
SS
ON/OFF
MAX5090B
C
C
BST
0.22µF
OUT
100µF
D1
PDS5100H
MA5090
SYNC
VD
BST
FB
16
N.C.
SS
SYNC
SGND
C
SS
0.047µF
VD
1
2
3
4
PGND
3.3µF
TQFN
19-3872; Rev 1; 9/14