19-4357; Rev 0; 10/08
Adjustable Overvoltage Protector
with High Accuracy
7/MAX14528
General Description
Features
The MAX14527/MAX14528 overvoltage protection
♦ Input Voltage Protection Up to +28V
devices feature a low 100mΩ (typ) R
internal FET
ON
♦ Preset Internal 2ꢀ.5 ꢁccurate ꢂVꢃꢂ ꢄTresTolꢅs
.ꢀ7.V (MꢁX14.27)
and protect low-voltage systems against voltage faults
up to +28V. When the input voltage exceeds the over-
voltage threshold, the internal FET is turned off to pre-
vent damage to the protected components.
6ꢀ76V (MꢁX14.28)
♦ ꢁꢅjustable ꢂvervoltage Protection ꢄrip ꢃevel
The overvoltage protection threshold can be adjusted
with optional external resistors to any voltage between
4V and 8V. With the OVLO input set below the external
OVLO select voltage, the MAX14527/MAX14528 auto-
matically choose the internal 2.5ꢀ accurate trip
thresholds. The internal overvoltage thresholds (OVLO)
are preset to 5.75V typical (MAX14527) or 6.76V typical
(MAX14528). The MAX14527/MAX14528 are also
protected against overcurrent events with an internal
thermal shutdown.
♦ Integrateꢅ 100mΩ (typ) n-CTannel MꢂSFEꢄ
SwitcT
♦ Soft-Start to Minimize In-RusT Current
♦ ꢁutomatic ꢂvervoltage Protection ꢄrip-ꢃevel
Selection
♦ Internal 1.ms Startup Delay
♦ ꢄTermal STutꢅown Protection
♦ 8-Pin ꢄDFN (2mm x 2mm) Package
♦ -40°C to +8.°C ꢂperating ꢄemperature Range
The MAX14527/MAX14528 are offered in a small, 8-pin
TDFN-EP package and operate over the -40°C to
+85°C extended temperature range.
Ordering Information
Applications
Cell Phones
ꢄꢂP
MꢁRK
ꢂVꢃꢂ
(V)
PꢁRꢄ
PIN-PꢁCKꢁGE
Media Players
MꢁX14.27ETA+T 8 TDFN-EP*
MꢁX14.28ETA+T 8 TDFN-EP*
ACR
ACS
5.75
6.76
PDAs and Palmtop Devices
Note: Devices are specified over the -40°C to +85°C tempera-
ture range.
+Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Pin Configuration appears at enꢅ of ꢅata sTeetꢀ
Typical Application Circuit
VBUS
USB
CONNECTOR
CHARGER
INPUT
IN
IN
OUT
1µF
OUT
PMIC
MAX14527
MAX14528
R1
R2
OVLO
GND
*
*R1 AND R2 ARE REQUIRED ONLY FOR ADJUSTABLE OVLO; OTHERWISE, CONNECT OVLO TO GND.
________________________________________________________________ Maxim Integrateꢅ Proꢅucts
1
For pricing, ꢅelivery, anꢅ orꢅering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at wwwꢀmaxim-icꢀcomꢀ