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MAX4926ELT+T

P1-P3P4-P6P7-P7
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
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
MAX4923–MAX4926
Overvoltage Protectors with
External pFET
________________________________________________________________
Maxim Integrated Products
1
MAX4923–MAX4926
OUTPUT
V
IO
GATE
FLAGGND
IN
1μF
4
3
1
2
INPUT
+1.8V TO 28V
P
Typical Operating Circuit
19-0810; Rev 0; 4/07
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.
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.
Pin Configuration
123
654
N.C GATEN.C
IN FLAGGND
MA4923
–
MAX4926
μDFN
TOP VIEW
MAX4923–MAX4926
Overvoltage Protectors with
External pFET
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V for MAX4923/MAX4924/MAX4925, V
IN
= +4V for MAX4926, C
GATE
= 500pF to IN, T
A
= -40°C to +85°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
IN, GATE to GND....................................................-0.3V to +30V
FLAG to GND ...........................................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V
IN
1.8 28.0 V
MAX4923 7.00 7.18 7.36
MAX4924 6.00 6.16 6.31
MAX4925 5.50 5.65 5.79
Overvoltage Lockout Level OVLO V
IN
rising
MAX4926 4.35 4.46 4.57
V
MAX4923 65
MAX4924 55
MAX4925 50
Overvoltage Lockout Hysteresis
MAX4926 40
mV
Undervoltage Lockout Level UVLO V
IN
falling 2.378 2.439 2.500 V
Undervoltage Lockout Hysteresis 20 mV
MAX4923/MAX4924/MAX4925 14 25
IN Supply Current I
IN
MAX4926 13 23
µA
GATE Voltage High V
OH
V
IN
> 8V, I
SOURCE
= 0.1mA
V
IN
-
0.2
V
GATE Pulldown Current I
PD
V
GATE
= V
IN
6.5 12 mA
FLAG Low Voltage V
OL
I
SINK
= 1mA 0.4 V
FLAG Leakage Current I
LKG
V
FLAG
= 5.5V -1 +1 µA
TIMING CHARACTERISTICS
Debounce Time t
DEB
V
UVLO
< V
IN
< V
OVLO,
time for GATE to go
low (Figure 1)
10 20 34 ms
Gate Turn-on Time t
GON
V
GATE
= 5V to 0.5V
(MAX4923/MAX4924/MAX4925) or
V
GATE
= 4V to 0.5V (MAX4926) (Figure 1)
0.6 µs
Gate Turn-Off Time t
GOFF
V
IN
rising at 1V/µs from 5V to 8V
(MAX4923/MAX4924/MAX4925) or from 4V
to 7V (MAX4926) to V
GATE
= V
IN
-0.5V
(Figure 1)
520µs
Flag Assertion Delay t
FLAG
V
IN
rising at 1V µs from 5V to 8V
(MAX4923/MAX4924/MAX4925) or from 4V
to 7V (MAX4926), to V
FLAG
= 2.4V,
R
FLAG
= 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.
MAX4923–MAX4926
Overvoltage Protectors with
External pFET
_______________________________________________________________________________________ 3
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX4923 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (μA)
161284
20
40
60
80
100
0
028
20
24
MAX4926
MAX4925
GATE VOLTAGE vs. INPUT VOLTAGE
MAX4923 toc02
INPUT VOLTAGE (V)
GATE VOLTAGE (V)
64
2
4
6
8
10
0
28
MAX4925
GATE-OUTPUT LOW VOLTAGE
vs. GATE SINK CURRENT
MAX4923 toc03
GATE SINK CURRENT (
μ
A)
GATE OUTPUT LOW VOLTAGE (mV)
600400200
50
100
150
200
250
0
0 1000
800
V
CC
= +2.5V
V
CC
= +3.3V
V
CC
= +5.5V
SUPPLY CURRENT vs. TEMPERATURE
MAX4923 toc04
TEMPERATURE (
°
C)
SUPPLY CURRENT (μA)
3510-15
11
12
13
14
15
10
-40 85
60
MAX4926
V
CC
= +4V
POWER-UP RESPONSE
MAX4923 toc05
V
IN
V
GATE
V
FLAG
5V/div
5V/div
5V/div
20.0 ms
POWER-UP RESPONSE
MAX4923 toc06
V
IN
V
OUT
I
IN
V
FLAG
10.0ms
5V/div
5V/div
1A/div
5V/div
Typical Operating Characteristics
(V
IN
= +5V for MAX4923/MAX4924/MAX4925, V
IN
= +4V for MAX4926 (pFET = Si6991DQ), T
A
= +25°C, unless otherwise noted.)
OVERVOLTAGE RESPONSE
MAX4923 toc07
V
IN
V
GATE
I
GATE
V
FLAG
5V/div
5V/div
10mA/div
5V/div
20.0μs
POWER-UP OVERVOLTAGE RESPONSE
MAX4923 toc08
V
IN
V
GATE
V
FLAG
5V/div
5V/div
5V/div
10.0ms
P1-P3P4-P6P7-P7

MAX4926ELT+T

Mfr. #:
Buy MAX4926ELT+T
Manufacturer:
Maxim Integrated
Description:
Power Management Specialized - PMIC Overvoltage Protector
Lifecycle:
New from this manufacturer.
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