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.
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
MAX4864L/MAX4865L/MAX4866L/MAX4867/MAX4865/MAX
4866
Ordering Information
PART
MAX4864L
EUT-T
MAX4864LELT
MAX4865L
EUT-T
MAX4865LELT
MAX4866L
EUT-T
MAX4866LELT
MAX4867
EUT-T
MAX4867ELT
PIN-
PACKAGE
6 SOT23-6
6 µDFN
6 SOT23-6
6 µDFN
6 SOT23-6
6 µDFN
6 SOT23-6
6 µDFN
OV TRIP
LEVEL (V)
7.40
7.40
6.35
6.35
5.80
5.80
4.65
4.65
TOP PKG
MARK CODE
ABVO
ABVP
ABVQ
ABVN
—
—
—
—
AAE L622-1
AAF L622-1
AAG L622-1
AAD L622-1
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
Note:
All devices are specified over the -40°C to +85°C operating
range.
Typical Operating Circuit
ADAPTER
(-28V TO +28V)
1µF
GATEP
IN
GATEN
GND 2
P
N
Pin Configurations
TOP VIEW
OUTPUT
IN 1
6
EN
GND
1
6
GATEN
EN
GND
MAX4864L
MAX4865L
MAX4866L
MAX4867
FLAG
V
IO
FLAG 3
MAX4864L
MAX4865L
MAX4866L
MAX4867
5
GATEP
FLAG
2
MAX4864L
MAX4865L
MAX4866L
MAX4867
5
GATEP
4
GATEN
IN
3
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.
Overvoltage Protection Controllers
with Reverse Polarity Protection
MAX4864L/MAX4865L/MAX4866L/MAX4867
ABSOLUTE MAXIMUM RATINGS
IN to GND ..............................................................-0.3V to +30V
GATEN, GATEP to GND ........................................-0.3V to +12V
IN to GATEP ...........................................................-0.3V to +20V
FLAG,
EN
to GND ....................................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
6-Pin µDFN (2mm x 2mm) (derate 2.1mW/°C
above +70°C) ..............................................................168mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW
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
(V
IN
= +5V (MAX4864L/MAX4865L/MAX4866L), V
IN
= +4V (MAX4867), T
A
= -40°C to +85°C, C
GATEN
= 500pF, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage Range
SYMBOL
V
IN
MAX4864L
Overvoltage Trip Level
OVLO
V
IN
rising
MAX4865L
MAX4866L
MAX4867
MAX4864L
Overvoltage Lockout
Hysteresis
MAX4865L
MAX4866L
MAX4867
Undervoltage Lockout
Threshold
Undervoltage Lockout
Hysteresis
IN Supply Current
I
IN
UVLO
V
IN
falling
MAX4864L/MAX4865L/MAX4866L
MAX4867
2.65
2.3
CONDITIONS
MIN
1.2
7.0
5.95
5.45
4.35
7.4
6.35
5.8
4.65
75
65
55
50
2.85
2.5
44
25
MAX4864L/MAX4865L/MAX4866L
MAX4867
MAX4864L/MAX4865L/MAX4866L,
V
IN
= +2.6V
MAX4867, V
IN
= +2.2V
Shutdown Supply Current
I
SHD
EN
= 1.6V
MAX4864L/MAX4865L/MAX4866L,
V
IN
= 3.6V
MAX4867, V
IN
= 3.6V
GATEN Voltage
GATEN Pulldown Current
GATEP Clamp Voltage
GATEP Pulldown Resistor
FLAG Output-Low Voltage
FLAG Leakage Current
EN
Input-High Voltage
EN
Input-Low Voltage
V
IH
V
IL
V
GATEN
I
PD
V
CLAMP
R
GATEP
V
OL
I
SINK
= 1mA
V
FLAG
= +5.5V
1.5
0.4
1µA load
MAX4864L/MAX4865L/MAX4866L
MAX4867
9
7.5
12
13.5
32
77
68
8.5
8
0.4
0.4
9.83
7.85
32
16.5
48
120
110
22
18
2
2
10
8.0
65
19.5
64
0.4
1
V
mA
V
kΩ
V
µA
V
V
µA
3.05
2.7
V
mV
µA
mV
TYP
MAX
28.0
7.8
6.75
6.15
4.95
V
UNITS
V
MAX4864L/MAX4865L/MAX4866L
MAX4867
EN
= GND
UVLO Supply Current
I
UVLO
EN
= GND
µA
V
IN
> OVLO, V
GATEN
= +5.5V
2
_______________________________________________________________________________________
Overvoltage Protection Controllers
with Reverse Polarity Protection
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +5V (MAX4864L/MAX4865L/MAX4866L), V
IN
= +4V (MAX4867), T
A
= -40°C to +85°C, C
GATEN
= 500pF, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
EN
Input Leakage Current
TIMING
Startup Delay
FLAG Blanking Time
GATEN Turn-On Time
t
START
t
BLANK
t
GON
V
IN
> UVLO to V
GATEN
> 0.3V, Figure 1
V
GATEN
> 0.3V to V
FLAG
< 0.3V, Figure 1
C
GATEN
= 500pF, V
GATEN
= 0.3V to +8V
(MAX4864L/MAX4865L/MAX4866L)
V
GATEN
= 0.3V to +7V (MAX4867), Figure 1
V
IN
rising at 3V/µs from +5V to +8V
(MAX4864L/MAX4865L/MAX4866L),
or from +4V to +7V (MAX4867)
V
GATEN
= 0.3V, C
GATEN
= 500pF, Figure 2
V
IN
rising at 3V/µs from 5V to 8V
(MAX4864L/MAX4865L/MAX4866L),
or from +4V to +7V (MAX4867), V
FLAG
= 0.3V,
Figure 2
V
IN
rising at 3V/µs from 0V to +9V, time from
V
IN
= 5V to I
GATEN
= 80% of I
PD
(GATEN pulldown
current), Figure 3
20
20
50
50
10
80
80
ms
ms
ms
SYMBOL
I
LKG
CONDITIONS
EN
= GND or +5.5V
MIN
TYP
MAX
1
UNITS
µA
MAX4864L/MAX4865L/MAX4866L/MAX4867
GATEN Turn-Off Time
t
Goff
7
20
µs
FLAG Assertion Delay
t
FLAG
3.5
µs
Initial Overvoltage Fault Delay
t
OVP
1.5
µs
Disable Time
t
DIS
V
EN
= +2.4V, V
GATEN
= 0.3V, Figure 4
2
µs
Note 1:
All parts are 100% tested at +25°C. Electrical limits across the full temperature range are guaranteed by design and correlation.
+5V
V
IN
V
UVLO
t
GON
+8V (+7V)*
t
START
V
GATEN
+0.3V
V
GATEN
+0.3V
V
IN
+5V
t
GOFF
V
OVLO
t
FLAG
V
FLAG
*MAX4867
t
BLANK
+0.3V
V
FLAG
+0.3V
Figure 1. Startup Timing Diagram
Figure 2. Shutdown Timing Diagram
V
IN
0V
V
OVLO
t
OVP
80%
V
EN
+2.4V
t
DIS
I
GATEN
V
GATEN
+0.3V
Figure 3. Power-Up Overvoltage Timing Diagram
Figure 4. Disable Timing Diagram
3
_______________________________________________________________________________________
Overvoltage Protection Controllers
with Reverse Polarity Protection
MAX4864L/MAX4865L/MAX4866L/MAX4867
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(MAX4864L)
MAX4864 toc01
REVERSE CURRENT vs. OUTPUT VOLTAGE
(MAX4864L)
MAX4864 toc02
REVERSE CURRENT vs. OUTPUT VOLTAGE
(MAX4864L)
EN = 0V
MAX4864 toc03
350
300
SUPPLY CURRENT (µA)
250
200
150
100
50
0
0
5
10
15
20
25
0.4
EN = 3V
80
REVERSE CURRENT (µA)
REVERSE CURRENT (µA)
0.3
60
DEVICE TURNS ON
AT TRANSITION
0.2
40
0.1
20
0
30
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
0
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
MAX4864L/MAX4865L/MAX4866L
GATEN VOLTAGE vs. INPUT VOLTAGE
MAX4864 toc04
MAX4867
GATEN VOLTAGE vs. INPUT VOLTAGE
MAX4864 toc05
POWER-UP RESPONSE
MAX4864 toc06
15
MAX4864L
15
5V
0V
12
GATEN VOLTAGE (V)
12
GATEN VOLTAGE (V)
MAX4867
9
ADAPTER
9
MAX4865L
5V
IN
0V
6
6
10V
GATEN
0V
5V
FLAG
3
MAX4866L
3
0
0
2
4
INPUT VOLTAGE (V)
6
8
0
0
2
4
INPUT VOLTAGE (V)
6
8
20ms/div
0V
POWER-UP RESPONSE
MAX4864 toc07
OVERVOLTAGE RESPONSE
MAX4864 toc08
ADAPTER
5V/div
IN
5V/div
OUT
5V/div
IIN
1A/div
FLAG
5V/div
20ms/div
2µs/div
8V
ADAPTER
5V
8V
IN
5V
GATEN
5V/div
I
GATEN
10mA/div
FLAG
5V/div
4
_______________________________________________________________________________________
Overvoltage Protection Controllers
with Reverse Polarity Protection
MAX4864L/MAX4865L/MAX4866L/MAX4867
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
POWER-UP OVERVOLTAGE RESPONSE
MAX4864 toc09
NEGATIVE VOLTAGE RESPONSE
MAX4864 toc10
8V
ADAPTER
0V
8V
IN
0V
IN
0V
GATEN
0V
5V
FLAG
0V
20ms/div
20ms/div
5V
FLAG
0V
5V
ADAPTER
0V
0V
GATEP
Pin Description
PIN
MAX4864LEUT/
MAX4865LEUT/
MAX4866LEUT/
MAX4867EUT
1
2
3
MAX4864LELT/
MAX4865LELT/
MAX4866LELT/
MAX4867ELT
3
1
2
NAME
FUNCTION
IN
GND
FLAG
Voltage Input. IN is both the power-supply input and the overvoltage sense input.
Ground
Fault-Indication Output. When
EN
goes high, FLAG becomes high-impedance. 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
pump. When V
UVLO
< V
IN
< V
OVLO
, GATEN is driven high to turn on the external
n-channel MOSFET.
p-Channel MOSFET Gate-Drive Output. GATEP is always on when input is above
ground and off when input drops below ground.
Active-Low Enable Input. Connect to ground in normal operation. Drive
EN
high to
disable device and enter shutdown mode.
4
6
GATEN
5
6
5
4
GATEP
EN
_______________________________________________________________________________________
5
Microchip MCU
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