EVALUATION KIT AVAILABLE
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
General Description
Features
● Wide Operating Input Voltage Range: 3.5V to 72V
The MAX5092A/MAX5092B/MAX5093A/MAX5093B low-
quiescent-current, low-dropout (LDO) regulators contain
simple boost preregulators operating at a high fre-
quency. The devices seamlessly provide a preset 3.3V
(MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B)
LDO output voltage from a cold-crank through load-dump
(3.5V to 80V) input voltage conditions. The MAX5092_/
MAX5093_ deliver up to 250mA with excellent load and
line regulation. During normal operation, when the battery
is healthy, the boost preregulator is completely turned off,
reducing quiescent current to 65μA (typ). This makes the
devices suitable for always-on power supplies.
with a 4V Startup Voltage
● LDO Output Regulates to 5V Seamlessly from an
Input Voltage of 3.5V to 72V
● Up to 250mA Output Current
● Preset 3.3V, 5V, or Externally Programmable LDO
Output Voltage from 1.5V to 9V (MAX5092_) or from
1.5V to 10V (MAX5093_)
● Preset 7V or Externally Programmable Boost
Output Voltage Up to 11V (MAX5092_) or Up to 12V
(MAX5093_)
● 65μA Quiescent Current in LDO Mode (V ≥ 8V)
IN
The buck-boost operation achieved by this combination of
LDO and boost preregulator offers the advantage of using
a single off-the-shelf inductor in place of the multiple-
winding custom magnetics needed in typical single-ended
primary inductor converter (SEPIC) and transformer-
based flyback topologies. The high operating frequency
of the boost regulator significantly reduces component
size. The MAX5092_ integrates a blocking diode to fur-
ther reduce the external component count. The boost
preregulator output voltage is preset to 7V. Both LDO and
boost output voltages are programmable using external
resistors. The boost preregulator output voltage is adjust-
able up to 11V(MAX5092_), or up to 12V (MAX5093_).
The LDO output voltage is adjustable from 1.5V to 9V
(MAX5092_) or from 1.5V to 10V (MAX5093_).
5μA Shutdown Current
● Power-On Reset (RESET) with Programmable
Timeout Period
● Output Short-Circuit and Thermal Protection
● TQFN Package Capable of Dissipating Up to 2.7W at
+70°C
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5092AATE+
MAX5092BATE+
MAX5093AATE+
MAX5093BATE+
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
The devices feature a shutdown mode with 5μA (typ) shut-
down current, a HOLD input to implement a self-holding cir-
cuit, and a power-on-reset output (RESET) with an externally
programmable timeout period. Additional features include
output overload, short-circuit, and thermal protection.
Pin Configuration
TOP VIEW
The MAX5092_/MAX5093_ are available in a thermally
enhanced, 16-pin 5mm x 5mm thin QFN package and
can dissipate up to 2.7W at +70°C on a multilayer PC
board (PCB).
12
11
10
9
OUT
8
7
6
5
BSFB 13
VL 14
MAX5092_/
MAX5093_
OUT_SENSE
SET
Applications
● Industrial
CT 15
16
PGND_LDO
RESET
+
1
2
3
4
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
THIN QFN
(5mm x 5mm)
19-0659; Rev 2; 10/14