19-3582; Rev 2; 5/10
Overvoltage Protection Controllers
with Reverse Polarity Protection
General Description
The MAX4864L/MAX4865L/MAX4866L/MAX4867 over-
voltage protection controllers protect low-voltage sys-
tems 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 damage 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 components. An inter-
nal charge pump eliminates the need for external
capacitors and drives the MOSFET GATEN for a simple,
robust solution.
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.
In addition, a ±15kV ESD 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 µDFN package, and are specified for
operation over the -40°C to +85°C temperature range.
Applications
Cell Phones
PDAs and Palmtop Devices
Digital Still Cameras MP3 Players
Typical Operating Circuit
Features
♦ 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
Packages
Ordering Information
PART
PIN-
PACKAGE
OV TRIP
TOP
LEVEL (V) MARK
MAX4864LEUT-T
MAX4864LELT
6 SOT23-6
6 μDFN
7.40
7.40
ABVO
AAE
MAX4865LEUT-T
MAX4865LELT
6 SOT23-6
6 μDFN
6.35
6.35
ABVP
AAF
MAX4866LEUT-T
MAX4866LELT
MAX4867EUT-T
6 SOT23-6
6 μDFN
6 SOT23-6
5.80
5.80
4.65
ABVQ
AAG
ABVN
MAX4867ELT
6 μDFN
4.65
AAD
Note: All devices are specified over the -40°C to +85°C operating
temperature range.
T = Tape and reel.
ADAPTER
(-28V TO +28V)
1μF
PN
GATEP IN GATEN
OUTPUT
Functional Diagram appears at end of data sheet.
MAX4864L
MAX4865L
MAX4866L
EN MAX4867
GND FLAG
VIO
________________________________________________________________ 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.
