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MAX4970EWC+T

P1-P3P4-P6P7-P9
General Description
The MAX4970/MAX4971/MAX4972 family of overvolt-
age protection devices features a low 40mΩ (typ) R
ON
internal FET and protect low-voltage systems against
voltage faults up to +28V. These devices also drive an
optional external pFET to protect against reverse-polari-
ty input voltages. When the input voltage exceeds the
overvoltage threshold, the internal FET is turned off to
prevent damage to the protected components.
All switches feature a 2.3A (min) current-limit protec-
tion. During a short-circuit occurrence, the device oper-
ates in an autoretry mode where the internal MOSFET is
turned on to check if the fault has been removed. The
autoretry interval time is 15ms, and if the fault is
removed, the MOSFET remains on.
The MAX4970/MAX4971/MAX4972 feature an enable
input (EN) that controls the operation of the internal
nFET as well as the optional external pFET. The use of
EN allows the external pFET to block reverse voltages
independent of any signal present at the output.
The overvoltage thresholds (OVLO) are preset to
4.65V (MAX4972), 5.8V (MAX4970), or 6.35V (MAX4971).
The undervoltage thresholds (UVLO) are preset to 2.45V.
When the input voltage drops below the UVLO, the
devices enter a low-current standby mode.
All devices are offered in a small 12-bump, WLP pack-
age and operate over the -40°C to +85°C extended
temperature range.
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
Features
♦ Input Voltage Protection up to +28V
♦ Integrated nFET Switch
♦ Reverse Voltage Protection with External pFET
♦ Enable Input
♦ Preset Overvoltage Protection Trip Level
5.8V (MAX4970)
6.35V (MAX4971)
4.65V (MAX4972)
♦ Low-Current Undervoltage-Lockout Mode
♦ Short-Circuit Protection (Autoretry)
♦ Internal 15ms Startup Delay and Retry Times
♦ Input-Voltage Power-Good Logic Output
♦ Thermal-Shutdown Protection
♦ 2mm x 1.5mm, 12-Bump WLP Package
MAX4970/MAX4971/MAX4972
Overvoltage-Protection Controllers
with a Low R
ON
Internal FET
________________________________________________________________
Maxim Integrated Products
1
Ordering Information/Selector Guide
19-4139; Rev 1; 8/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+
Denotes a lead-free/RoHS-compliant package.
T
= Tape-and-reel package.
Typical Operating Circuit appears at end of data sheet.
PART
PIN-PACKAGE TOP MARK PACKAGE CODE
UVLO (V)
OVLO
(
V
)
ACOK ACTION
MAX4970EWC+T
12 WLP AAA W121A2+1 2.45 5.8 UVLO only
MAX4971EWC+T
12 WLP AAB W121A2+1 2.45 6.35 UVLO only
MAX4972EWC+T
12 WLP AAC W121A2+1 2.45 4.65
UVLO and OVLO
Pin Configuration
TOP VIEW (BUMPS ON BOTTOM)
MAX4970/MAX4971/MAX4972
OUT
OUT
OUT OUT
GPIN
IN
GND
IN
IN
1234
A
B
C
WLP
EN
ACOK
MAX4970/MAX4971/MAX4972
Overvoltage-Protection Controllers
with a Low R
ON
Internal FET
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(Voltages referenced to GND.)
IN ............................................................................-0.3V to +30V
IN-GP.........................................................................(30V - 5.4V)
OUT.............................................................-0.3V to +(IN + 0.3)V
EN, ACOK.................................................................-0.3V to +6V
GP...........................................................................-0.3V to +30V
Continuous Power Dissipation (T
A
= +70°C) for
Multilayer Board:
12-Bump WLP (derate 8.5mW/°C above +70°C).....678mW
WLP Package Junction-to-Ambient Thermal
Resistance (
θ
JA
) (Note 1)...........................................118°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering) .........................................+300°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
ELECTRICAL CHARACTERISTICS
(V
IN
= +2.2V to +28V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Input Voltage Range V
IN
2.2 28 V
T
A
= +25°C
176 230
E N = 0V
V
I N
= 12V ; GP cl am p on
T
A
= T
MIN
to T
MAX
250
T
A
= +25°C 60
107
EN = 0V
V
IN
= 5V (MAX4970),
V
IN
= 5.5V (MAX4971),
V
IN
= 3.8V (MAX4972)
T
A
= T
MIN
to T
MAX
150
Input Supply Current I
IN
EN = 1.4V 50
100
µA
UVLO Supply Current I
UVLO
V
IN
< V
UVLO
; V
IN
= 2.2V 40 µA
V
IN
falling
2.20 2.45 2.65
IN Undervoltage Lockout
V
UVLO
V
IN
rising
2.25
2.5 2.7
V
1%
MAX4970 5.6 5.9 6.2
MAX4971 6.0 6.4 6.8
V
IN
rising
MAX4972
4.35 4.70 5.05
MAX4970
5.50 5.80 6.15
MAX4971
6.00 6.35 6.70
Overvoltage Trip Level
V
OVLO
V
IN
falling
MAX4972
4.30 4.65 5.00
V
IN Overvoltage Lockout Hysteresis 1%
MAX4970/MAX4971/MAX4972
Overvoltage-Protection Controllers
with a Low R
ON
Internal FET
_______________________________________________________________________________________ 3
Note 2: All specifications are 100% production tested at T
A
= +25°C, unless otherwise noted. Specifications are over -40°C to +85°C
and are guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +2.2V to +28V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Switch On-Resistance R
ON
V
IN
= 5V (MAX4970),
V
IN
= 5.5V (MAX4971),
V
IN
= 3.8V (MAX4972); I
OUT
= 400mA
40 90
mΩ
Overcurrent Protection Threshold I
LIM
V
IN
= 5V (MAX4970),
V
IN
= 5.5V (MAX4971),
V
IN
= 3.8V (MAX4972)
2.30 3.36
A
GP Clamp Voltage V
GPC
V
IN
- V
GP
, V
IN
up to 28V 5.4 7.0 8.5 V
GP Pulldown Resistor
R
GPPD
EN = low,
V
GP
= V
IN
= 5V (MAX4970),
V
GP
= V
IN
= 5.5V (MAX4971),
V
GP
= V
IN
= 3.8V (MAX4972)
16 36 54
kΩ
GP Pullup Resistor to IN
R
GPPU
EN = high, V
IN
= 5V 9 15 25
kΩ
EN Input-Voltage High V
IH
1.4 V
EN Input-Voltage Low V
IL
0.4 V
EN Input Leakage Current I
EN
V
EN
= 5V 1 µA
ACOK Output-Low Voltage V
OL
I
SINK
= 1mA 0.4 V
ACOK High Leakage Current V
ACOK
= 5.5V, ACOK deasserted 1 µA
Thermal Shutdown
+150
°C
Thermal-Shutdown Hysteresis 40 °C
Maximum Output Capacitance C
OUT
1000
µF
TIMING CHARACTERISTICS (Figure 1)
Debounce Time
t
INDBC
Time from V
UVLO
< V
IN
< V
OVLO
, R
LOAD
=
100Ω, C
LOAD
= 1µF to charge-pump enable
15
ms
Switch Turn-On Time t
ON
V
UVLO
< V
IN
< V
OVLO
, R
LOAD
= 100Ω,
C
LOAD
= 1µF from EN low to 90% of V
OUT
13
ms
V
U V LO
< V
IN
to ACOK l ow ( M AX 4970/M AX 4971)
ACOK Assertion Time t
ACOK
V
U V LO
< V
IN
< V
OV LO
to AC OK l ow ( M AX 4972)
15
ms
V
IN
< V
UVLO
to internal switch off 4 8
Switch Turn-Off Time t
OFF
V
IN
> V
OVLO
to internal switch off,
R
LOAD
= 100Ω
511
µs
Current Limit Turn-Off Time
t
BLANK
Overcurrent fault to internal switch off 10 µs
Autoretry Time
t
RETRY
From overcurrent fault to internal switch
turn-on, Figure 2
15
ms
P1-P3P4-P6P7-P9

MAX4970EWC+T

Mfr. #:
Buy MAX4970EWC+T
Manufacturer:
Maxim Integrated
Description:
Current & Power Monitors & Regulators Overvoltage-Protect Controller
Lifecycle:
New from this manufacturer.
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