switches 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 guaranteed 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 condition
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 packages. These
devices operate over the -40°C to +85°C extended
temperature range.
Typical Operating Circuit
appear at end of data sheet. end
of data sheet.
Benefits and Features
● Reverse Current Protection
● 0.2Ω On-Resistance
● Guaranteed Current Limit: 100mA, 200mA, 300mA
● Thermal-Shutdown Protection
●
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
Applications
●
●
●
●
●
●
●
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Handheld Devices
SDIO
USB Ports
Notebook Computers
19-0544; Rev 3; 1/16
MAX4914B/MAX4915A/B/
MAX4917A/B
Absolute Maximum Ratings
100mA/200mA/300mA Current-Limit Switches
with Low Shutdown Reverse Current
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
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
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
Latchoff Current (Note 2)
Forward Shutdown Current
Reverse Shutdown Current
Forward Current Limit
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
µA
µA
µA
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
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
www.maximintegrated.com
Maxim Integrated
│
2
MAX4914B/MAX4915A/B/
MAX4917A/B
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
DYNAMIC CHARACTERISTICS
Turn-On Time
Turn-Off Time
Blanking Time
Short-Circuit Current-Limit
Response Time
Retry Time (Note 4)
t
RETRY
t
BLANK
V
ON
from low to high; I
OUT
= 10mA,
C
L
= 0.1µF (Note 3)
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
100
40
60
µs
ns
ms
µs
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
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.
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Microcontroller MCU
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