19-3582; Rev 1; 5/06
Overvoltage Protection Controllers
with Reverse Polarity Protection
General Description
Features
The MAX4864L/MAX4865L/MAX4866L/MAX4867/
MAX4865/MAX4866 overvoltage protection controllers
protect low-voltage systems against high-voltage faults
up to +28V, and negative voltages down to -28V. These
devices drive a low-cost complementary MOSFET. If the
input voltage exceeds the overvoltage threshold, these
devices turn off the n-channel MOSFET to prevent dam-
age to the protected components. If the input voltage
drops below ground, the devices turn off the p-channel
MOSFET to prevent damage to the protected compo-
nents. An internal charge pump eliminates the need for
external capacitors and drives the MOSFET GATEN for
a simple, robust solution.
♦ Overvoltage Protection Up to +28V
♦ Reverse Polarity Protection Down to -28V
♦ Preset Overvoltage (OV) Trip Level (7.4V, 6.35V,
5.8V, 4.65V)
♦ Drive Low-Cost Complementary MOSFET
♦ Internal 50ms Startup Delay
♦ Internal Charge Pump
♦ 8.5µA Standby Current (In UVLO Mode)
♦ 0.4µA Shutdown Current
♦ Overvoltage Fault FLAG Indicator
♦ 6-Pin (2mm x 2mm) µDFN and 6-Pin SOT23
The overvoltage thresholds are preset to +7.4V
(MAX4864L), +6.35V (MAX4865L), +5.8V (MAX4866L),
and +4.65V (MAX4867). When the input voltage drops
below the undervoltage lockout (UVLO) threshold, the
devices enter a low-current standby mode (8.5µA). Also in
shutdown (EN set to logic-high), the current is reduced fur-
ther (0.4µA). The MAX4864L/MAX4865L/MAX4866L have
a +2.85V UVLO threshold, and the MAX4867 has a +2.5V
UVLO threshold. The MAX4865/MAX4866 have a 4.15V
UVLO threshold.
Packages
Ordering Information
PIN-
PACKAGE
OV TRIP
TOP PKG
LEVEL (V) MARK CODE
PART
MAX4864LEUT-T 6 SOT23-6
MAX4864LELT 6 µꢀFN
MAX4865LEUT-T 6 SOT23-6
MAX4865LELT 6 µꢀFN
MAX4866LEUT-T 6 SOT23-6
7.40
7.40
6.35
6.35
5.80
5.80
4.65
4.65
ABVO
AAE L622-1
ABVP
AAF L622-1
ABVQ
AAG L622-1
ABVN
AAꢀ L622-1
—
In addition, a 15kV ESꢀ protection is provided to the
input when bypassed with a 1µF capacitor to ground. All
devices are offered in a small 6-pin SOT23 and a 6-pin,
2mm x 2mm µꢀFN package, and are specified for
operation over the -40°C to +85°C temperature range.
—
—
MAX4866LELT
MAX4867EUT-T
MAX4867ELT
6 µꢀFN
6 SOT23-6
6 µꢀFN
—
Applications
Cell Phones
ꢀigital Still Cameras
PꢀAs and Palmtop ꢀevices
MP3 Players
Note: All devices are specified over the -40°C to +85°C operating
range.
Typical Operating Circuit
Pin Configurations
ADAPTER
(-28V TO +28V)
TOP VIEW
P
N
OUTPUT
1 F
IN
GND
1
2
3
6
5
4
EN
GND
FLAG
IN
1
2
3
6
5
4
GATEN
GATEP
EN
GATEP
IN
GATEN
MAX4864L
MAX4865L
MAX4866L
MAX4867
MAX4864L
MAX4865L
MAX4866L
MAX4867
GATEP
GATEN
MAX4864L
MAX4865L
MAX4866L
MAX4867
V
IO
FLAG
EN
SOT23
DFN
GND
FLAG
Functional Diagram appears 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.