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PDF MAX4864L Data sheet ( Hoja de datos )
| Número de pieza | MAX4864L | |
| Descripción | (MAX4864L - MAX4867) Overvoltage Protection Controllers | |
| Fabricantes | Maxim Integrated Products | |
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DataSheet.in
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
PN
GATEP IN GATEN
OUTPUT
MAX4864L
MAX4865L
MAX4866L
EN MAX4867
GND FLAG
VIO
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.
________________________________________________________________ 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.
1 page  
DataSheet.in
Overvoltage Protection Controllers
with Reverse Polarity Protection
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
POWER-UP OVERVOLTAGE RESPONSE
MAX4864 toc09
8V
ADAPTER
0V
8V
IN
0V
20ms/div
GATEN
0V
5V
FLAG
0V
NEGATIVE VOLTAGE RESPONSE
MAX4864 toc10
5V
ADAPTER
0V
0V
GATEP
IN
0V
20ms/div
5V
FLAG
0V
Pin Description
PIN
MAX4864LEUT/
MAX4865LEUT/
MAX4866LEUT/
MAX4867EUT
MAX4864LELT/
MAX4865LELT/
MAX4866LELT/
MAX4867ELT
NAME
FUNCTION
1 3 IN Voltage Input. IN is both the power-supply input and the overvoltage sense input.
2 1 GND Ground
Fault-Indication Output. When EN goes high, FLAG becomes high-impedance. FLAG
3 2 FLAG is asserted high during undervoltage lockout and overvoltage lockout conditions.
FLAG is deasserted during normal operation. FLAG is an open-drain output.
n-Channel MOSFET Gate-Drive Output. GATEN is the output of an on-chip charge
4 6 GATEN pump. When VUVLO < VIN < VOVLO, GATEN is driven high to turn on the external
n-channel MOSFET.
5
5
GATEP
p-Channel MOSFET Gate-Drive Output. GATEP is always on when input is above
ground and off when input drops below ground.
6
4
EN Active-Low Enable Input. Connect to ground in normal operation. Drive EN high to
disable device and enter shutdown mode.
_______________________________________________________________________________________ 5
5 Page 
DataSheet.in
Overvoltage Protection Controllers
with Reverse Polarity Protection
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
COMMON DIMENSIONS
SYMBOL
MIN.
NOM.
A
0.70
0.75
A1
0.15
0.20
A2 0.020 0.025
D
1.95
2.00 -
E
1.95
2.00
L
0.30
0.40
L1 0.10 REF.
MAX.
0.80
0.25
0.035
2.05
2.05
0.50
PACKAGE VARIATIONS
PKG. CODE
N
e
L622-1
6 0.65 BSC
L822-1
8 0.50 BSC
L1022-1
10 0.40 BSC
b
0.30±0.05
0.25±0.05
0.20±0.03
(N/2 -1) x e
1.30 REF.
1.50 REF.
1.60 REF.
-DRAWING NOT TO SCALE-
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
21-0164
A
2
2
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX4864L.PDF ] | |
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