MAX4959 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – High-Voltage OVP with Battery Switchover

19-0874; Rev 0; 7/07
High-Voltage OVP with Battery Switchover
General Description
The MAX4959/MAX4960 overvoltage protection con-
trollers protect low-voltage systems against high-volt-
age faults of up to +28V. When the input voltage
exceeds the overvoltage lockout (OVLO) threshold,
these devices turn off an external pFET to prevent dam-
age to the protected components. The undervoltage
lockout (UVLO) threshold holds the external pFET off
until the input voltage rises to the correct level. An addi-
tional safety feature latches off the pFET when an incor-
rect low-power adapter is plugged in.
The MAX4959/MAX4960 control an external battery
switchover pFET (P2) (see Figures 4 and 6) that switches
in the battery when the AC adapter is unplugged. The
undervoltage and overvoltage trip levels can be adjusted
with external resistors.
The input is protected against ±15kV HBM ESD when
bypassed with a 1µF ceramic capacitor to ground. All
devices are available in a small 10-pin (2mm x 2mm)
µDFN and 10-pin µMAX packages and are specified for
operation over the extended -40°C to +85°C temperature
range.
Applications
Notebooks
Laptops
Camcorders
Ultra-Mobile PCs
Features
o Overvoltage Protection Up to +28V
o ± 2.5% Accurate Externally Adjustable
OVLO/UVLO Thresholds
o Battery Switchover pFET Control
o Protection Against Incorrect Power Adapter
o Low (100µA Typ) Supply Current
o 25ms Input Debounce Timer
o 25ms Blanking Time
o 10-Pin (2mm x 2mm) µDFN and 10-Pin µMAX
Packages
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX4959ELB+ -40°C to +85°C 10 μDFN AAO L1022-1
MAX4959EUB+* -40°C to +85°C 10 μMAX
— U10-1
MAX4960ELB+ -40°C to +85°C 10 μDFN AAP L1022-1
MAX4960EUB+* -40°C to +85°C 10 μMAX
— U10-1
+Denotes a lead-free package.
*Future product—Contact factory for availability.
Pin Configurations
TOP VIEW
10 9 8 7 6
MAX4959
MAX4960
+
1234 5
GATE1 1
N.C. ₂
(SOURCE1)
IN 3
UVS 4
OVS 5
MAX4959
MAX4960
µMAX
6 GATE2
7 N.C.
8 ^GND
9 CB
10 ^VDD
( ) MAX4960 ONLY.
µDFN
Typical Operating Circuits appear at end of data sheet.
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