MAX4772EUT+T [MAXIM]
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MAXIM INTEGRATED PRODUCTS |
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19-2926; Rev 0; 7/03
200mA/500mA Selectable
Current-Limit Switches
General Description
Features
The MAX4772/MAX4773 switches feature selectable
internal current limiting to prevent damage to host
devices due to faulty load conditions. The
MAX4772/MAX4773 include a logic input to select a
guaranteed 200mA or 500mA current limit, making them
ideal for SDIO and other load-switching applications.
These analog switches have a low 0.2Ω on-resistance
and operate from a 2.0V to 4.5V input voltage range.
o Guaranteed Current Limit: 200mA or 500mA
o Thermal-Shutdown Protection
o Reverse-Current Protection
o 0.2Ω On-Resistance (SEL = High)
o 14ms Guaranteed Blanking Time
o FLAG Function
o Autoretry (MAX4773)
o 80µA Supply Current
When the switch is on and a load is connected to the
port, a guaranteed blanking time of 14ms ensures that
the transient voltage settles down. If, after this blanking
time, the load current is greater than the current limit,
the MAX4772 switch is turned off and issues a FLAG to
the microprocessor. The switch can be turned on again
by cycling the power or the ON input.
o 6µA Latch-Off Current (MAX4772)
o 0.01µA Shutdown Current
o 2.0V to 4.5V Supply Range
o Fast Current-Limit Response Time
o Tiny SOT23 and TDFN Packages
o UL Certification Pending
The MAX4773 has an autoretry feature where the switch
turns off and issues a FLAG to the microprocessor after
the blanking time and then continuously checks to see if
the overload condition is present. The switch remains
on after the overload condition disappears and FLAG
deasserts.
Ordering Information
PIN-
PACKAGE
TOP
MARK
PART
TEMP RANGE
MAX4772EUT-T
MAX4772ETT*
MAX4773EUT-T
MAX4773ETT*
-40°C to +85°C 6 SOT23-6
-40°C to +85°C 6 TDFN-EP**
-40°C to +85°C 6 SOT23-6
-40°C to +85°C 6 TDFN-EP**
ABND
—
The MAX4772/MAX4773 are available in tiny space-sav-
ing 6-pin SOT23 and 6-pin TDFN (3mm x 3mm) pack-
ages.
ABNE
—
Applications
*Future product—contact factory for availability.
**EP—Exposed pad.
SDIO
PDAs and Palmtop Devices
Cell Phones
Selector Guide
PART
MAX4772EUK-T
MAX4772ETT
AUTORETRY
GPS Systems
No
No
Hand-Held Devices
MAX4773EUK-T
MAX4773ETT
Yes
Yes
Typical Operating Circuit
2.0V TO 4.5V
Pin Configurations
TOP VIEW
IN
ON
IN
GND
ON
1
2
6
5
4
OUT
SEL
µP
IN
OUT
SEL
1
2
6
5
4
ON
FLAG
OUT
MAX4772
MAX4773
GND
FLAG
MAX4772
MAX4773
MAX4772
MAX4773
TO SDIO PORT
SEL
3
FLAG
3
GND
SOT23
TDFN
________________________________________________________________ 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.
200mA/500mA Selectable
Current-Limit Switches
ABSOLUTE MAXIMUM RATINGS
IN, ON, FLAG, SEL, OUT to GND.............................-0.3V to +6V
OUT Short Circuit to GND.................................Internally Limited
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
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW
6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
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 = +2.0V to +4.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V = +3.3V, T = +25°C.) (Note 1)
IN
A
IN
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
4.5
UNITS
V
Operating Voltage
Quiescent Current
V
2.0
IN
Q
I
V
V
= V , switch on
V
V
= +3.3V
= +3.3V
80
6
125
µA
ON
ON
IN
IN
IN
= V , after an
overcurrent fault (MAX4772)
IN
Latch-Off Current (Note 2)
Shutdown Current
I
10
µA
µA
LATCH
I
V
= 0V, SEL = low or floating
0.03
1
320
800
320
800
+1
SHDN
ON
SEL = low, V = 3.3V, V
= GND
OUT
200
500
IN
Forward-Current Limit
mA
SEL = high, V = 3.3V, V
IN
= GND
OUT
SEL = low
SEL = high
Reverse-Current Limit
mA
ON Input Leakage
-1
µA
µA
µA
µA
µA
Shutdown Forward Leakage
Shutdown Reverse Leakage
SEL Pulldown Current
SEL Input Current
V
V
= 0V, V
= 0V
OUT
0.01
1
ON
ON
= 0V, V = 2V, V
= 4.5V
OUT
1
IN
After power-up (V > 2V, 0V < V
< 0.5V)
SEL
30
-1
100
+1
IN
Measured after first low-to-high transition
SEL = low, I = 100mA
0.45
0.18
0.9
0.36
LOAD
On-Resistance (Note 3)
R
Ω
ON
SEL = high, I
= 100mA
LOAD
V
V
= 2V to 3.6V
1.4
2
IN
IN
ON, SEL Input Logic High
Voltage
V
V
IH
> 3.6V
ON, SEL Input Logic Low Voltage
V
0.5
0.4
V
V
IL
FLAG Output Logic Low Voltage
I
= 1mA
SINK
FLAG Output High Leakage
Current
V
= V
= V = 4.5V
ON
1
µA
IN
FLAG
Thermal Shutdown
Thermal-Shutdown Hysteresis
DYNAMIC
150
15
°C
°C
V
from low to high, I
= 10mA,
= 10mA,
ON
OUT
Turn-On Time (Note 4)
120
100
µs
C = 0.1µF
L
V
from high to low, I
ON
OUT
Turn-Off Time (Note 4)
Blanking Time
ns
C = 0.1µF
L
t
Overcurrent fault (Figures 4 and 5)
14
60
ms
BLANK
2
_______________________________________________________________________________________
200mA/500mA Selectable
Current-Limit Switches
ELECTRICAL CHARACTERISTICS (continued)
(V = +2.0V to +4.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V = +3.3V, T = +25°C.) (Note 1)
IN
A
IN
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Short-Circuit Current-Limit
Response Time
V
= V , short circuit applied to OUT
5
µs
ON
IN
Retry Time (Note 5)
t
MAX4773 (Figure 4)
210
900
ms
RETRY
Note 1: All parts are 100% tested at +25°C. Electrical limits across the full temperature range are guaranteed by design and corre-
lation.
Note 2: Latch-off current does not include the current flowing into FLAG.
Note 3: TDFN parts are guaranteed by design.
Note 4: The on-time is defined as the time taken for the current through the switch to go from 0mA to full load. The off-time is defined
as the time taken for the current through the switch to go from full load to 0mA.
Note 5: Retry time is typically 15 times the blanking time (typ).
Typical Operating Characteristics
(V = 3.3V, T = +25°C, unless otherwise noted.)
IN
A
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
LATCH-OFF CURRENT
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
10
9
8
7
6
5
4
3
2
1
0
160
100
90
80
70
60
50
V
= V
IN
V
ON
= V
IN
V
= V
ON IN
ON
140
120
100
80
60
40
20
0
-40
-15
10
35
60
85
2.0
2.5
3.0
3.5
4.0
4.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
LATCH-OFF LEAKAGE CURRENT
vs. TEMPERATURE
100
10
1
100
V
= 0V, V
= 0V
ON
OUT
10
1
10
1
0.1
0.1
0.1
0.01
0.001
0.01
0.01
0.001
0.001
0.0001
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
________________________________________________________________________________________ 3
200mA/500mA Selectable
Current-Limit Switches
Typical Operating Characteristics (continued)
(V = 3.3V, T = +25°C, unless otherwise noted.)
IN
A
SHUTDOWN REVERSE LEAKAGE CURRENT
vs. TEMPERATURE
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
OUTPUT CURRENT
vs. OUTPUT VOLTAGE
10
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1000
900
800
700
600
500
400
300
200
100
0
V
= 0V, V
= 4.5V
OUT
ON
1
V
SEL
= V
IN
0.1
0.01
V
SEL
= GND
0.001
0.0001
-40
-15
10
35
60
85
-40
-15
10
35
60
85
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3
- V (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
V
IN
OUT
FORWARD CURRENT LIMIT
vs. SUPPLY VOLTAGE
SWITCH TURN-ON/OFF TIMES
vs. TEMPERATURE
FLAG-BLANKING TIMEOUT
vs. TEMPERATURE
700
650
600
550
500
450
400
350
300
250
200
100
10
50
I
= 10mA
OUT = GND
LOAD
45
40
35
30
ON
SEL = HIGH
1
0.1
25
20
OFF
SEL = LOW
3.0
SUPPLY VOLTAGE (V)
0.01
2.0
2.5
3.5
4.0
4.5
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
CURRENT-LIMIT RESPONSE
(OUT SHORTED TO GND)
CURRENT-LIMIT RESPONSE
CURRENT-LIMIT RESPONSE
MAX4772/3 toc13
MAX4772/3 toc15
MAX4772/3 toc14
3.3V
V
3V
IN
2V/div
V
= V
ON
3V
IN
1V/div
V
IN
2V/div
0V
3.3V
0V
3V
V
V
OUT
2V/div
ON
2V/div
0V
0V
0V
0V
0V
I
OUT
I
OUT
200mA/div
200mA/div
C
C
= 1µF
OUT
V
= 3.3V
C
= 1µF
= 3.3V
I
IN
IN
OUT
OUT
V
= V
C = 1µF
SEL
IN
ON OUT
= 1µF
C
= 1µF
V
SEL
5A/div
IN
C
IN
= 1µF
V
= 3.3V
0V
40µs/div
4µs/div
40µs/div
4
_______________________________________________________________________________________
200mA/500mA Selectable
Current-Limit Switches
Typical Operating Characteristics (continued)
(V = 3.3V, T = +25°C, unless otherwise noted.)
IN
A
REVERSE CURRENT LIMIT
SWITCH TURN-ON TIME RESPONSE
MAX4772/3 toc16
MAX4772/3 toc17
3.3V
V
V
ON
1V/div
IN
2V/div
3V
0V
3V
V
OUT
2V/div
0V
0V
0V
0V
I
I
OUT
10mA/div
OUT
1A/div
C
C
SEL
= 1µF
IN
= 1µF
OUT
V
= 3.3V
200µs/div
20µs/div
FLAG-BLANKING RESPONSE
SWITCH TURN-OFF TIME RESPONSE
(OVERLOAD CONDITION)
MAX4772/3 toc18
MAX4772/3 toc19
3.3V
V
IN
2V/div
3.3V
V
ON
1V/div
0V
3.3V
V
OUT
2V/div
0V
0V
0V
3.3V
V
FLAG
2V/div
I
OUT
10mA/div
0V
0V
V
C
C
= V = 3.3V
IN
SEL
= 1µF
IN
I
OUT
= 1µF
OUT
500mA/div
40ns/div
10ms/div
Pin Description
PIN
SOT23 TDFN
NAME
FUNCTION
1
2
3
1
5
6
IN
Input. Bypass with a 0.1µF ceramic capacitor to ground.
Ground
GND
ON
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.
4
4
FLAG
Current-Limit Threshold Selection. Connect to logic-low level or leave floating to select 200mA current-
limit threshold. Connect to logic-high level to select 500mA current-limit threshold.
5
6
3
2
SEL
OUT
Switch Output. Bypass with a 0.1µF ceramic capacitor to ground.
_______________________________________________________________________________________
5
200mA/500mA Selectable
Current-Limit Switches
REVERSE-CURRENT DETECTOR
FLAG
BLANKING TIME
CIRCUITRY
N
FORWARD-CURRENT
DETECTOR
N
IN
OUT
ON
LOGIC
MAX4772/MAX4773
GND
SEL
Figure 1. Functional Diagram
Current-Limit Threshold Selection
The MAX4772/MAX4773 SEL logic input sets the
desired minimum current-limit threshold to 200mA or
500mA. Connect SEL low or leave floating for 200mA
current limit and high for the 500mA current limit.
Detailed Description
The MAX4772/MAX4773 are forward/reverse current-
limited switches that operate from a 2.0V to 4.5V input
voltage range and guarantee a 200mA or 500mA mini-
mum current-limit threshold when driving SEL low or
high, respectively. The voltage drop across an internal
sense resistor is compared to two reference voltages to
indicate a forward or reverse current-limit fault. When
the load current exceeds the preset current limit for
greater than the fault-blanking time, the switch opens.
During power-up, if SEL is low or floating, the current limit
is set to 200mA. The MAX4772/MAX4773 uses an internal
pulldown resistor (100µA, max) to set the default current
limit to 200mA when SEL is floating. After the first low-to-
high transition, the pulldown resistor is internally discon-
nected and the level on SEL determines the current limit
(SEL = low, 200mA and SEL = high, 500mA).
The MAX4773 has an autoretry function that turns on
the switch again after an internal retry time expires. If
the faulty load condition is still present after the blank-
ing time, the switch turns off again and the cycle is
repeated. If the faulty load condition is not present, the
switch remains on.
During power-up, if SEL and V rise together, the cur-
IN
rent limit is immediately set to 500mA.
Figures 2 and 3 illustrate the two different modes of
power-up sequence for the MAX4772/MAX4773. In
Figure 2, the switch powers up, V ≥ 2V, a low-to-high
IN
The MAX4772 does not have the autoretry option and
the switch remains in latch-off mode until the ON pin or
the input power is cycled from high to low and then
high again.
transition on SEL changes the current limit from 200mA to
500mA. In Figure 3, the switch powers up in the 500mA
current-limit mode with SEL and IN rising simultaneously.
The microprocessor’s GPIO must be able to source the
100µA drive current for the MAX4772/MAX4773 500mA
current-limit operation. After the current limit has been set
to 500mA, the 100µA driving current is no longer needed.
6
_______________________________________________________________________________________
200mA/500mA Selectable
Current-Limit Switches
V
IN ≥
2V
V
IN
= 2V
V
V
IN
V
IH
V
IN
200mA
500mA
SEL
500mA
100µA (MAX)
V
SEL
SEL
I
I
SEL
Figure 2. MAX4772/MAX4773 Power-Up Sequence (V
after Power-Up)
Rises
Figure 3. MAX4772 Power-Up Sequence (V
Simultaneously)
and V Rise
SEL IN
SEL
Reverse-Current Protection
The MAX4772/MAX4773 limit the reverse current (V to
When the overcurrent condition is removed, FLAG
deasserts and the switch turns on (Figure 4).
OUT
V ) from exceeding the maximum I
value. The switch
IN
REV
FLAG is an open-drain output transistor and requires an
external pullup resistor from FLAG to IN. During shut-
down (ON is low), the pulldown on FLAG output is
released in order to limit power dissipation. FLAG goes
low when any of the following conditions occur:
is shut off and FLAG is asserted if the reverse current-limit
condition persists for more than the blanking time. This
feature prevents excessive reverse currents from flowing
through the device.
• The die temperature exceeds the thermal-shutdown
temperature limit of +150°C.
Switch-On/Off Control
Toggle ON high to enable the current-limited switches.
When a forward/reverse current fault is present or the die
exceeds the thermal-shutdown temperature of +150°C,
OUT is internally disconnected from IN and the supply
current decreases to 8µA (latch off). The switch is now
operating in one of its off states. The switch-off state also
occurs when driving ON low, thus reducing the supply
current (shutdown) to 0.01µA. Table 1 illustrates the
ON/OFF state of the MAX4772/MAX4773 current-limit
switches.
• The device is in current limit for more than the fault-
blanking period.
• The switch is in autoretry.
Autoretry (MAX4773)
When the forward or reverse current-limit threshold is
exceeded, t
timer begins counting (Figure 4).
BLANK
The timer resets if the overcurrent condition disappears
before t has elapsed. A retry time delay (t
)
RETRY
has elapsed and
BLANK
is started immediately after t
BLANK
FLAG Indicator
The MAX4772/MAX4773 feature a fault output (FLAG).
Whenever an overcurrent condition is encountered, the
MAX4772 latches FLAG low and turns the switch off.
The MAX4773 latches FLAG low and keeps it low until
the overcurrent conditon is removed. During this time,
the switch cycles on and off in the autoretry mode.
during that time, the switch is latched off and FLAG
asserts. At the end of t , the switch is turned on
RETRY
again. If the fault still exists, the cycle is repeated. If the
fault has been removed, the switch stays on and FLAG
deasserts.
Table 1. MAX4772/MAX4773 Switch Truth Table
ON
Low
High
FAULT
X
SWITCH ON/OFF
SUPPLY CURRENT MODE
Shutdown
OFF
Thermal
OFF immediately (t
period does not apply)
Latch off
BLANK
OFF after t
period has elapsed
Latch off
BLANK
High
Current Limit
ON during t
MAX4773 cycle repeats until fault is removed
period, OFF during t
period for the
BLANK
RETRY
See the Autoretry section
_______________________________________________________________________________________
7
200mA/500mA Selectable
Current-Limit Switches
t
t
BLANK
BLANK
t
t
t
t
BLANK
BLANK
RETRY
BLANK
CURRENT
LIMIT
LOAD
CURRENT
SHORT
CONDITION
REMOVED
LOAD
CURRENT
ON
ON
SWITCH
STATUS
SWITCH
STATUS
OFF
ON PIN
VOLTAGE
OFF
FLAG PIN
STATUS
FLAG PIN
STATUS
(a)
Figure 4. MAX4773 Autoretry Fault-Blanking Diagram
t
t
BLANK
BLANK
LOAD
CURRENT
The autoretry feature saves system power in the case of
an overcurrent or short-circuit condition. During t
,
BLANK
ON
when the switch is on, the supply current is at the cur-
rent limit. During t , when the switch is off, the cur-
rent through the switch is zero. Instead of observing the
full load current, the switch sees the equivalent load
SWITCH
STATUS
RETRY
OFF
IN PIN
VOLTAGE
current times duty cycle or I
= I
✕
SUPPLY
). With a typical t
LOAD
t
/(t
+ t
=
BLANK BLANK
RETRY
BLANK
37ms and typical t
= 555ms, the duty cycle is
FLAG PIN
STATUS
RETRY
6%, which results in a 94% power savings over the
switch being on the entire time. The duty cycle is con-
sistent across the process and devices.
(b)
Figure 5. MAX4773 Latch-Off Fault Blanking
Latch Off (MAX4772)
When the forward or reverse current-limit threshold is
exceeded, t
timer begins counting. The timer
resets if the overcurrent condition disappears before
has elapsed. The switch is shut off and FLAG
BLANK
A thermal fault causes FLAG to assert immediately and
does not wait for the blanking time.
t
BLANK
Thermal Shutdown
The MAX4772/MAX4773 have a thermal-shutdown fea-
ture to protect the devices from overheating. The switch
turns off and FLAG goes low immediately (no fault
blanking) when the junction temperature exceeds
+150°C. The switch with autoretry turns back on when
the device temperature drops approximately 15°C. The
switch with the latch off requires ON cycling.
asserts if the overcurrent condition continues up to the
end of the blanking time. Reset the switch by either tog-
gling ON (Figure 5) or cycling the input voltage (Figure 5).
Fault Blanking
The MAX4772/MAX4773 feature 14ms (min) fault blank-
ing. Fault blanking allows current-limit faults, including
momentary short-circuit faults that occur when hot
swapping a capacitive load, and also ensures that no
fault is issued during power-up. When a load transient
causes the device to enter current limit, an internal
counter starts. If the load-transient fault persists beyond
the fault-blanking timeout, FLAG asserts low. Load-tran-
Applications Information
Input Capacitor
To limit the input-voltage drop during momentary output
short-circuit conditions, connect a capacitor from IN to
GND. A 0.1µF ceramic capacitor is adequate for most
applications; however, higher capacitor values further
sient faults less than t
do not cause a FLAG out-
BLANK
put assertion. Only current-limit faults are blanked.
8
_______________________________________________________________________________________
200mA/500mA Selectable
Current-Limit Switches
reduce the voltage drop at the input and are recom-
mended for lower voltage applications.
During normal operation, the power dissipation is small
and the package temperature change is minimal. If the
output is continuously shorted to ground at the maxi-
mum supply voltage, the operation of the switches with
the autoretry option does not cause problems because
the total power dissipated during the short is scaled by
the duty cycle:
Output Capacitance
Connect a 0.1µF capacitor from OUT to GND. This
capacitor helps prevent inductive parasitics from
pulling OUT negative during turn-off, thus preventing
the MAX4772/MAX4773 from tripping erroneously. If the
load capacitance is too large, then current may not
have enough time to charge the capacitance and the
device assumes that there is a faulty load condition.
The maximum capacitive load value that can be driven
from OUT is obtained by the following formula:
V
× I
× t
+ t
BLANK
IN_MAX
OUT_MAX BLANK
P
=
= 211mW
= 14ms, and
MAX
t
RETRY
where V = 4.5V, I
= 750mA, t
BLANK
IN
OUT
t
= 210ms.
RETRY
Attention must be given to the MAX4772 where the
latch-off condition must be manually reset by toggling
ON from high to low. If the latch-off time duration is not
sufficiently high, it is possible for the device to reach
the thermal-shutdown threshold and never be able to
turn the device on until it cools down.
I
× t
BLANK_MIN
FWD_MIN
C
<
MAX
V
IN
Layout and Thermal Dissipation
To optimize the switch response time to output short-
circuit conditions, it is very important to keep all traces
as short as possible to reduce the effect of undesirable
parasitic inductance. Place input and output capacitors
as close as possible to the device (no more than 5mm).
IN and OUT pins must be connected with short traces
to the power bus.
Chip Information
TRANSISTOR COUNT: 2539
PROCESS: BiCMOS
_______________________________________________________________________________________
9
200mA/500mA Selectable
Current-Limit Switches
Package Information
(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.)
PACKAGE OUTLINE, SOT-23, 6L
1
21-0058
F
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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