MAX4864L Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Overvoltage Protection Controllers with Reverse Polarity Protection

19-3582; Rev 1; 5/06
Overvoltage Protection Controllers
with Reverse Polarity Protection
General Description
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.
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.
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
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 -
OV TRIP TOP PKG
PACKAGE LEVEL (V) MARK CODE
MAX4864LEUT-T 6 SOT23-6
MAX4864LELT 6 µDFN
MAX4865LEUT-T 6 SOT23-6
MAX4865LELT 6 µDFN
MAX4866LEUT-T 6 SOT23-6
MAX4866LELT 6 µDFN
MAX4867EUT-T 6 SOT23-6
MAX4867ELT
6 µDFN
7.40
ABVO —
7.40
AAE L622-1
6.35
ABVP —
6.35
AAF L622-1
5.80
ABVQ —
5.80
AAG L622-1
4.65
ABVN —
4.65
AAD L622-1
Note: All devices are specified over the -40°C to +85°C operating
range.
Typical Operating Circuit
Pin Configurations
ADAPTER
(-28V TO +28V)
1µF
P
N
GATEP IN GATEN
OUTPUT
MAX4864L
V_IO
MAX4865L
MAX4866L
EN ^MAX4867
GND
FLAG
TOP VIEW
IN 1
6 EN
GND 1
GND 2
FLAG 3
MAX4864L
MAX4865L
MAX4866L
MAX4867
5 GATEP
4 GATEN
FLAG 2
IN 3
6 GATEN
MAX4864L
MAX4865L
MAX4866L
MAX4867
5 GATEP
4 EN
SOT23
µDFN
Functional Diagram appears at end of data sheet.
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