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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX4925 Datasheet

(MAX4923 - MAX4926) Overvoltage Protectors

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MAX4925 pdf
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19-0810; Rev 0; 4/07
Overvoltage Protectors with
External pFET
General Description
The MAX4923–MAX4926 overvoltage protection
(OVP) controllers protect low-voltage systems against
high-voltage faults of up to +28V with an appropriate
external pFET. When the input voltage exceeds the over-
voltage lockout (OVLO) threshold, or falls below the
undervoltage lockout (UVLO) threshold, these devices
turn off the pFET to prevent damage to protected compo-
nents and issue a flag to notify the processor of a fault
condition.
The typical overvoltage trip level is set to 7.18V
(MAX4923), 6.16V (MAX4924), 5.65V (MAX4925), and
4.46V (MAX4926). The undervoltage trip level is set to
2.44V (typ) for all devices.
The input (IN) is ESD protected to ±15kV HBM when
bypassed to ground with a 1µF ceramic capacitor. All
devices are offered in a small, 6-pin (1.5mm x 1.0mm)
µDFN package and are specified over the extended
-40°C to +85°C temperature range.
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
Pin Configuration
TOP VIEW
N.C N.C GATE
6 54
Features
o Overvoltage Protection Up to +28V
o Preset 7.18V, 6.16V, 5.65V, and 4.46V Typical
Overvoltage Trip Levels
o Preset 2.44V Typical Undervoltage Trip Level
o ±2.5% Accurate Overvoltage/Undervoltage
Trip Levels
o Low 13µA (typ) Supply Current
o Drives External pFET
o 20ms Adapter Debounce Time
o Fault Flag Indicator
o 6-Pin (1.5mm x 1.0mm) µDFN Package
Typical Operating Circuit
INPUT
+1.8V TO 28V
1μF
P OUTPUT
1
IN
4
GATE
MAX4923–MAX4926
VIO
MA4923MAX4926
2
GND
3
FLAG
123
IN GND FLAG
μDFN
Ordering Information/Selector Guide
PART
PIN-PACKAGE
OVLO (V)
UVLO (V)
TOP MARK
PKG CODE
MAX4923ELT+*
6 μDFN
7.18
2.44
LB
L611-1
MAX4924ELT+
6 μDFN
6.16
2.44
LC
L611-1
MAX4925ELT+
6 μDFN
5.65
2.44
LD
L611-1
MAX4926ELT+
6 μDFN
4.46
2.44
LE
L611-1
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes lead-free package.
*Future Product—contact factory for availability.
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX4925 Datasheet

(MAX4923 - MAX4926) Overvoltage Protectors

No Preview Available !

MAX4925 pdf
Overvoltage Protectors with
External pFET
ABSOLUTE MAXIMUM RATINGS
IN, GATE to GND....................................................-0.3V to +30V
FLAG to GND ...........................................................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C)
6-µDFN (derate 2.1mW/°C above 70°C) .......................168mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300 °C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +5V for MAX4923/MAX4924/MAX4925, VIN = +4V for MAX4926, CGATE = 500pF to IN, TA = -40°C to +85°C, unless otherwise
noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
VIN
MAX4923
1.8 28.0
7.00 7.18 7.36
V
Overvoltage Lockout Level
OVLO VIN rising
MAX4924
MAX4925
6.00 6.16 6.31
5.50 5.65 5.79
V
MAX4926
4.35 4.46 4.57
MAX4923
65
Overvoltage Lockout Hysteresis
MAX4924
MAX4925
55
mV
50
MAX4926
40
Undervoltage Lockout Level
UVLO VIN falling
2.378 2.439 2.500
V
Undervoltage Lockout Hysteresis
20 mV
IN Supply Current
GATE Voltage High
GATE Pulldown Current
FLAG Low Voltage
FLAG Leakage Current
TIMING CHARACTERISTICS
Debounce Time
IIN
VOH
IPD
VOL
ILKG
MAX4923/MAX4924/MAX4925
MAX4926
VIN > 8V, ISOURCE = 0.1mA
VGATE = VIN
ISINK = 1mA
VFLAG = 5.5V
14 25
13 23
µA
VIN -
0.2
V
6.5 12
mA
0.4 V
-1 +1 µA
tDEB
VUVLO < VIN < VOVLO, time for GATE to go
low (Figure 1)
10
20
34
ms
Gate Turn-on Time
VGATE = 5V to 0.5V
tGON (MAX4923/MAX4924/MAX4925) or
0.6 µs
VGATE = 4V to 0.5V (MAX4926) (Figure 1)
Gate Turn-Off Time
tGOFF
VIN rising at 1V/µs from 5V to 8V
(MAX4923/MAX4924/MAX4925) or from 4V
to 7V (MAX4926) to VGATE = VIN -0.5V
(Figure 1)
5 20 µs
Flag Assertion Delay
tFLAG
VIN rising at 1V µs from 5V to 8V
(MAX4923/MAX4924/MAX4925) or from 4V
to 7V (MAX4926), to VFLAG = 2.4V,
RFLAG = 10kΩ to 3V (Figure 1)
4.5
µs
Note 1: All devices are 100% tested at +25°C. Electrical limits across the full temperature range are guaranteed by design and characterization.
2 _______________________________________________________________________________________


Part Number MAX4925
Description (MAX4923 - MAX4926) Overvoltage Protectors
Maker Maxim Integrated Products
Total Page 7 Pages
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