19-4139; Rev 1; 8/08
Overvoltage-Protection Controllers
with a Low R Internal FET
ON
01/MAX4972
General Description
Features
The MAX4970/MAX4971/MAX4972 family of overvolt-
♦ Input Voltage Protection up to +28V
♦ Integrated nFET Switch
age protection devices features a low 40mΩ (typ) R
ON
internal FET and protect low-voltage systems against
voltage faults up to +28V. These devices also drive an
optional external pFET to protect against reverse-polari-
ty input voltages. When the input voltage exceeds the
overvoltage threshold, the internal FET is turned off to
prevent damage to the protected components.
♦ Reverse Voltage Protection with External pFET
♦ Enable Input
♦ Preset Overvoltage Protection Trip Level
5.8V (MAX4970)
6.35V (MAX4971)
4.65V (MAX4972)
All switches feature a 2.3A (min) current-limit protec-
tion. During a short-circuit occurrence, the device oper-
ates in an autoretry mode where the internal MOSFET is
turned on to check if the fault has been removed. The
autoretry interval time is 15ms, and if the fault is
removed, the MOSFET remains on.
♦ Low-Current Undervoltage-Lockout Mode
♦ Short-Circuit Protection (Autoretry)
♦ Internal 15ms Startup Delay and Retry Times
♦ Input-Voltage Power-Good Logic Output
♦ Thermal-Shutdown Protection
The MAX4970/MAX4971/MAX4972 feature an enable
input (EN) that controls the operation of the internal
nFET as well as the optional external pFET. The use of
EN allows the external pFET to block reverse voltages
independent of any signal present at the output.
♦ 2mm x 1.5mm, 12-Bump WLP Package
Pin Configuration
The overvoltage thresholds (OVLO) are preset to
4.65V (MAX4972), 5.8V (MAX4970), or 6.35V (MAX4971).
The undervoltage thresholds (UVLO) are preset to 2.45V.
When the input voltage drops below the UVLO, the
devices enter a low-current standby mode.
TOP VIEW (BUMPS ON BOTTOM)
1
2
3
4
MAX4970/MAX4971/MAX4972
A
B
C
All devices are offered in a small 12-bump, WLP pack-
age and operate over the -40°C to +85°C extended
temperature range.
ACOK
GND
EN
OUT
OUT
IN
OUT
IN
OUT
GP
IN
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
IN
WLP
Ordering Information/Selector Guide
PART
PIN-PACKAGE
12 WLP
TOP MARK
AAA
PACKAGE CODE
W121A2+1
UVLO (V)
2.45
OVLO (V)
5.8
ACOK ACTION
UVLO only
MAX4970EWC+T
MAX4971EWC+T
MAX4972EWC+T
12 WLP
AAB
W121A2+1
2.45
6.35
UVLO only
12 WLP
AAC
W121A2+1
2.45
4.65
UVLO and OVLO
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes a lead-free/RoHS-compliant package.
T = Tape-and-reel package.
Typical Operating Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.