19-0654; Rev 0; 11/06
28V, 100mA, Low-Quiescent-Current LDO
with Reset and Power-Fail Input/Output
General Description
Features
♦ +5V to +28V Wide Operating Input Voltage Range
♦ Withstands 40V Input Voltage Transients
♦ Guaranteed 100mA Output Current
The MAX5091 high-voltage linear regulator is designed
to operate from a +5V to +28V input voltage, and with-
stands up to 40V transients. The device consumes only
45µA of quiescent current at 100µA output current. The
MAX5091 delivers up to 100mA of output current with
low 50mV maximum dropout voltage. The MAX5091
provides an active-low open-drain microprocessor
RESET output. The reset timeout period is programma-
ble and can be set with an external capacitor. The
MAX5091 includes an uncommitted comparator for
input voltage monitoring/power-fail indication. The
device is available with a fixed +5V (MAX5091A) or
+3.3V (MAX5091B) output. The MAX5091 is short-cir-
cuit protected and includes thermal shutdown.
♦ 45µA Typical Quiescent Current at 100µA Output
Current
♦ Preset +5V (MAX5091A) or +3.3V (MAX5091B)
Output Voltage
♦ Stable with Only 10µF Output Capacitance
♦ RESET Output with Adjustable Timeout Period
♦ Uncommitted Comparator for Voltage
Monitoring/Power-Fail Indication
The MAX5091 operates over the -40°C to +125°C auto-
motive temperature range and is available in 8-pin,
thermally enhanced TDFN and SO-EP packages.
♦ Output Overload and Short-Circuit Protection
♦ Thermal Shutdown
♦ Available in 8-Pin TDFN (1.95W at T = +70°C) and
A
Applications
8-Pin SO (1.5W at T = +70°C)
A
Automotive
Industrial
Home Security/Safety
♦ Operates Over -40°C to +125°C Automotive
Temperature Range
Telecom/Networking
Ordering Information
PIN-
PACKAGE
PRESET V
PKG
CODE
TOP
MARK
OUT
PART
(V)
T833-2
S8E-14
T833-2
S8E-14
MAX5091AATA+T
MAX5091AASA+
MAX5091BATA+T
MAX5091BASA+
8 TDFN-8
8 SO-EP*
8 TDFN-8
8 SO-EP*
5
+APB
—
5
3.3
3.3
+APC
—
Note: All devices specified for -40°C to +125°C operating temperature range.
+Denotes lead-free package. *EP = Exposed paddle.
Pin Configurations
Typical Application Circuit
V
SO
7
RES GND
OUT
TOP VIEW
+5V (MAX5091A)/
+3.3V (MAX5091B)
100mA
8
6
5
+5V TO +28V
V
V
V
OUT
IN
S
C
IN
C
10μF
OUT
10μF
R
H
R
RES
MAX5091
ON
288kΩ
10kΩ
MAX5091
EN
SI
OFF
μC
RESET
EXPOSED PADDLE
RES
SO
+
R
L
100kΩ
R
SO
10kΩ
1
2
3
4
POWER-
FAIL
CT
C
0.1μF
V
S
SI
EN
CT
CT
GND
TDFN
(3mm x 3mm)
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.