19-0544; Rev 2; 6/08
100mA/200mA/300mA Current-Limit Switches
with Low Shutdown Reverse Current
General Description
The MAX4914B/MAX4915A/B/MAX4917A/B family of switch-
es feature internal current limiting to prevent damage to host
devices due to faulty load conditions. These analog switches
have a low 0.2Ω on-resistance and operate from a 2.3V
to 5.5V input voltage range. They are available with guaran-
teed 100mA, 200mA, and 300mA current limits, making
them ideal for SDIO and other load switching applications.
When the switch is on and a load is connected to the
port, a guaranteed blanking time of 14ms ensures that
the transient voltages settle down. If after this blanking
time the load current is greater than the current limit,
the MAX4914B/MAX4915B/MAX4917B latchoff versions
enter a latchoff state where the switch is turned off and
FLAG
is issued to the microprocessor. The switch can
be turned on again by cycling the power or the ON pin.
The MAX4915A/MAX4917A have an autoretry feature
where the switch turns off after the blanking time and
then continuously checks to see if the overload condi-
tion is present. The switch turns on and remains on after
the overload condition disappears and
FLAG
deasserts.
The MAX4914B is available in the tiny 6-pin µDFN
(2mm x 2mm) package, while the MAX4915A/B
and MAX4917A/B are available in both 6-pin µDFN
(2mm x 2mm) and space-saving 5-pin SOT23 pack-
ages. These devices operate over the -40°C to +85°C
extended temperature range.
♦
Thermal-Shutdown Protection
♦
Reverse Current Protection
♦
0.2Ω On-Resistance
♦
14ms Guaranteed Blanking Time
♦
FLAG
Function
♦
80µA Supply Current
♦
8µA Latchoff Current
(MAX4914B/MAX4915B/MAX4917B)
♦
Autoretry (MAX4915A/MAX4917A)
♦
0.01µA Shutdown Current
♦
2.3V to 5.5V Supply Range
♦
Undervoltage Lockout
♦
Fast Current-Limit Response Time (5µs)
♦
Low (0.1µA typ) Reverse Shutdown Current
♦
Tiny 6-Pin µDFN (2mm x 2mm) and 5-Pin SOT23
Packages
Features
♦
Guaranteed Current Limit: 100mA, 200mA, 300mA
MAX4914B/MAX4915A/B/MAX4917A/B
Applications
PDAs and Palmtop
Devices
Cell Phones
GPS Systems
Handheld Devices
SDIO
USB Ports
Notebook Computers
Ordering Information/Selector Guide
PART
MAX4914BELT+T
MAX4915AELT+T
MAX4915AEUK+T*
MAX4915BELT+T
MAX4915BEUK+T*
MAX4917AELT+T
MAX4917AEUK+T*
MAX4917BELT+T
MAX4917BEUK+T*
PIN-PACKAGE
6 µDFN
6 µDFN
5 SOT23
6 µDFN
5 SOT23
6 µDFN
5 SOT23
6 µDFN
5 SOT23
TOP MARK
ABF
ABL
AEYN
ABG
AEYK
ABN
AEYP
ABI
AEYM
CURRENT LIMIT (mA)
100
200
200
200
200
300
300
300
300
RETRY/LATCH-OFF
Latchoff
Autoretry
Autoretry
Latchoff
Latchoff
Autoretry
Autoretry
Latchoff
Latchoff
Note:
All devices are specified over the -40°C to +85°C operating temperature range.
*Future
product—contact factory for availability.
+Denotes
a lead-free/RoHS-compliant package.
T =
Tape-and-reel package.
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
100mA/200mA/300mA Current-Limit Switches
with Low Shutdown Reverse Current
MAX4914B/MAX4915A/B/MAX4917A/B
ABSOLUTE MAXIMUM RATINGS
IN, ON,
FLAG,
OUT to GND .....................................-0.3V to +6V
OUT Short Circuit to GND .................................Internally Limited
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
6-Pin µDFN (derate 4.5mW/°C above +70°C)................358mW
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
= +2.3V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
IN
= +3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage
Quiescent Current
Latchoff Current (Note 2)
Forward Shutdown Current
Reverse Shutdown Current
Forward Current Limit
SYMBOL
V
IN
I
Q
I
LATCH
I
SHDN
I
SHDN
I
FWD
V
ON
= V
IN
, I
OUT
= 0,
switch on
V
IN
= +2.3V to +5.0V
V
IN
= +5.0V to +5.5V
8
0.01
0.01
100
200
300
CONDITIONS
MIN
2.3
80
TYP
MAX
5.5
120
160
17
1
1
150
300
450
150
300
450
-1
1.75
100
R
ON
V
IH
V
IL
T
A
= +25°C, I
OUT
= 95mA
T
A
= -40°C to +85°C, I
OUT
= 95mA
MAX4914B/MAX4915B/MAX4917B
MAX4915A/MAX4917A
MAX4914B/MAX4915B/MAX4917B
MAX4915A/MAX4917A
I
SINK
= 1mA
V
ON
= V
IN
= V
FLAG
= +5.5V
+150
15
V
ON
from low to high; I
OUT
= 10mA,
C
L
= 0.1µF (Note 3)
2.0
1.4
0.8
0.4
0.4
1
0.2
0.4
0.5
+1
2.25
µA
V
mV
Ω
V
V
V
µA
°C
°C
mA
mA
UNITS
V
µA
µA
µA
µA
V
ON
= V
IN
, after an overcurrent fault MAX4914B/
MAX4915B/MAX4917B (latchoff versions)
V
ON
= 0, V
OUT
= 0, V
IN
= +5.5V
V
ON
= 0, V
OUT
= +5.5V, V
IN
= +2.3V
MAX4914B, V
OUT
= GND
MAX4915_, V
OUT
= GND
MAX4917_, V
OUT
= GND
MAX4914B, V
OUT
- V
IN
≥
0.5V
Reverse Current Limit
ON Input Leakage
Undervoltage Lockout
Undervoltage-Lockout Hysteresis
On-Resistance
ON Input Logic-High Voltage
ON Input Logic-Low Voltage
FLAG
Output Logic-Low Voltage
FLAG
Output-High Leakage
Current
Thermal Shutdown
Thermal-Shutdown Hysteresis
DYNAMIC CHARACTERISTICS
Turn-On Time
I
REV
MAX4915_, V
OUT
- V
IN
≥
0.5V
MAX4917_, V
OUT
- V
IN
≥
0.5V
V
ON
= V
IN
or GND
UVLO
Rising edge
100
µs
2
_______________________________________________________________________________________
100mA/200mA/300mA Current-Limit Switches
with Low Shutdown Reverse Current
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +2.3V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
IN
= +3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Turn-Off Time
Blanking Time
Short-Circuit Current-Limit
Response Time
Retry Time (Note 4)
t
RETRY
t
BLANK
SYMBOL
CONDITIONS
V
ON
from high to low; I
OUT
= 10mA,
C
L
= 0.1µF (Note 3)
Overcurrent fault (Figures 2, 3)
V
ON
= V
IN
= +3.3V, short circuit applied to
OUT
MAX4915A/MAX4917A (autoretry versions)
(Figure 2) (Note 4)
210
14
5
900
MIN
TYP
40
60
MAX
UNITS
ns
ms
µs
ms
MAX4914B/MAX4915A/B/MAX4917A/B
Note 1:
All parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation.
Note 2:
Latchoff current does not include the current flowing into
FLAG.
Note 3:
The on-time is defined as the time taken for the current through the switch to go from 0mA to 10mA. The off-time is defined
as the time taken for the current through the switch to go from 10mA to 0mA.
Note 4:
Retry time is typically 15 times the blanking time.
Typical Operating Characteristics
(V
IN
= 3.3V, T
A
= +25°C, unless otherwise noted.)
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
MAX4914A/B toc01
QUIESCENT CURRENT
vs. TEMPERATURE
MAX4914A/B toc02
LATCHOFF CURRENT
vs. TEMPERATURE
V
ON
= V
IN
10
LATCHOFF CURRENT (μA)
8
V
IN
= 5V
6
4
V
IN
= 3.3V
2
0
MAX4914A/B toc03
100
90
QUIESCENT CURRENT (μA)
80
70
60
50
40
30
20
10
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
V
ON
= V
IN
120
V
ON
= V
IN
100
QUIESCENT CURRENT (μA)
80
60
V
IN
= 3.3V
40
20
0
V
IN
= 5V
12
5.5
-40
-15
10
35
60
85
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
FORWARD SHUTDOWN CURRENT
vs. TEMPERATURE
MAX4914A/B toc04
REVERSE SHUTDOWN CURRENT
vs. TEMPERATURE
ON = GND, V
OUT
= 5.5V
REVERSE SHUTDOWN CURRENT (nA)
V
IN
= 5V
MAX4914A/B toc05
LATCHOFF LEAKAGE CURRENT
vs. TEMPERATURE
MAX4914A/B toc06
1000
FORWARD SHUTDOWN CURRENT (nA)
V
CC
= 5V
1
100
LATCHOFF LEAKAGE CURRENT (nA)
10
1
0.1
V
IN
= 3.3V
0.01
0.001
100
V
IN
= 5V
10
V
CC
= 3.3V
1
0.1
V
IN
= 3.3V
0.1
0.01
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.01
-40
0.0001
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
100mA/200mA/300mA Current-Limit Switches
with Low Shutdown Reverse Current
MAX4914B/MAX4915A/B/MAX4917A/B
Typical Operating Characteristics (continued)
(V
IN
= 3.3V, T
A
= +25°C, unless otherwise noted.)
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX4914A/B toc07
OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX4914A/B toc08
SWITCH TURN-ON/OFF TIMES
vs. TEMPERATURE
I
LOAD
= 10mA
ON
10
MAX4914A/B toc09
1.4
V
CC
= 5V
1.2
NORMALIZED R
ON
1.0
0.8
0.6
0.4
0.2
0
-40
-15
10
35
60
500
450
400
OUTPUT CURRENT (mA)
350
300
250
200
150
100
50
0
MAX4915_
100
SWITCH TURN-ON/OFF TIMES (μs)
1
0.1
OFF
0.01
0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3
V
IN
- V
OUT
(V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
85
TEMPERATURE (°C)
FLAG-BLANKING TIMEOUT
vs. TEMPERATURE
MAX4914A/B toc10
CURRENT-LIMIT RESPONSE (V
ON
RISING)
MAX4914A/B toc11
CURRENT-LIMIT RESPONSE
(V
IN
AND V
ON
RISING TOGETHER)
MAX4914A/B toc12
50
FLAG-BLANKING TIMEOUT (ms)
45
40
35
30
25
20
-40
-15
10
35
60
C
IN
= 0.1μF
C
OUT
= 0.1μF
V
IN
2V/div
0V
V
IN
= V
ON
1V/div
V
ON
2V/div
0V
I
OUT
100mA/div
0mA
85
20μs/div
TEMPERATURE (°C)
0V
I
OUT
100mA/div
C
IN
= 0.1μF
C
OUT
= 0.1μF
20μs/div
0mA
CURRENT-LIMIT RESPONSE
(OUT SHORTED TO GND)
MAX4914A/B toc13
TURN-ON RESPONSE
MAX4914A/B toc14
C
IN
= 1μF
C
OUT
= 0.1μF
V
IN
2V/div
0V
V
ON
1V/div
V
OUT
2V/div
0V
0V
I
OUT
50mA/div
I
OUT
5A/div
0A
40μs/div
20μs/div
C
IN
= 0.1μF
C
OUT
= 0.1μF
0mA
4
_______________________________________________________________________________________
100mA/200mA/300mA Current-Limit Switches
with Low Shutdown Reverse Current
Typical Operating Characteristics (continued)
(V
IN
= 3.3V, T
A
= +25°C, unless otherwise noted.)
MAX4914B/MAX4915A/B/MAX4917A/B
TURN-OFF RESPONSE
MAX4914A/B toc15
FLAG-BLANKING RESPONSE
MAX4914A/B toc16
C
IN
= 0.1μF
C
OUT
= 0.1μF
V
ON
1V/div
V
IN
2V/div
C
IN
= 0.1μF
C
OUT
= 0.1μF
0V
V
ON
2V/div
0V
V
FLAG
2V/div
0V
I
OUT
200mA/div
0mA
10ms/div
0V
I
OUT
10mA/div
0mA
200ns/div
Pin Description
PIN
MAX4915A/B/
MAX4917A/B
(SOT23)
1
2
3
4
MAX4914A/B/
MAX4915A/B/
MAX4917A/B
(µDFN)
2
5
6
4
NAME
FUNCTION
IN
GND
ON
FLAG
Input. Bypass with a 0.1µF ceramic capacitor to ground as close to the device
as possible.
Ground
Active-High, Switch-On Input. A logic-high turns the switch on.
Fault Output. This open-drain output goes low when the device stays in
forward or reverse current limit for more than the blanking time period.
FLAG
is
high impedance when a fault is not present or when ON is low.
Switch Output. Bypass with a 0.1µF ceramic capacitor to ground as close to
the device as possible.
No Connection. Not internally connected.
5
—
3
1
OUT
N.C.
_______________________________________________________________________________________
5
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