Maxim MAX4766 0.075a to 1.5a, programmable current-limit switch Datasheet

19-3458; Rev 0; 10/04
0.075A to 1.5A, Programmable
Current-Limit Switch
Features
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♦
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♦
♦
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♦
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♦
♦
The MAX4766 is a programmable current-limit switch
that uses a proprietary control topology to provide a
±10% accurate current limit. It operates from 2.25V to
4.5V input voltage.
The current limit is resistor settable from 0.075A to 1.5A
and features an adjustable soft-start function to control
the output-voltage ramp rate, thereby limiting the inrush
current. It also has an adjustable blanking time to
accommodate various capacitive loads.
If the load current is greater than the current-limit
threshold, the current limiter handles the overcurrent
situation in one of three ways depending on the option
selected. It enters an autoretry mode (MAX4766A),
latches off the switch (MAX4766B), or places the
device in a continuous current-limit mode (MAX4766C).
Additional safety features include thermal shutdown to
prevent overheating and reverse-current blocking to
prevent current from being driven back into the source.
±10% Accurate Current Limit
0.075A to 1.5A Programmable Current Limit
Inrush Current Protection
Thermal Shutdown Protection
Reverse-Current Protection
Low Dropout Voltage
Programmable Blanking Time
Programmable Soft-Start Time
FLAG Function (MAX4766B/MAX4766C)
Tiny 8-Pin TDFN Package (3mm x 3mm)
2.25V to 4.5V Supply Range
Typical Operating Circuit
The MAX4766 is available in a tiny 8-pin 3mm x 3mm
TDFN package and operates over the extended temperature range of -40°C to +85°C.
2.25V TO 4.5V
Applications
SDIO Ports
Notebook Computers
IN
PDAs and Palmtop Devices
Cell Phones
OUT
ON
µP
FLAG*
MAX4766
SETB
SETI
Pin Configuration
SETS
TOP VIEW
GND
SETB 1
FLAG 2
SETI 3
*MAX4766B/C
8 GND
7 ON
MAX4766
OUT 4
6 SETS
5 IN
TDFN
Ordering Information/Selector Guide
TOP MARK
PKG CODE
SOFT-START/
BLANKING
8 TDFN
AKV
T833-1
Programmable
Autoretry
8 TDFN
AKW
T833-1
Programmable
Latch-Off
8 TDFN
AKX
T833-1
Programmable
Continuous
PART
TEMP RANGE
PIN-PACKAGE
MAX4766AETA
-40°C to +85°C
MAX4766BETA
-40°C to +85°C
MAX4766CETA
-40°C to +85°C
OVERCURRENT
RESPONSE
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4766
General Description
MAX4766
0.075A to 1.5A, Programmable
Current-Limit Switch
ABSOLUTE MAXIMUM RATINGS
IN, OUT, ON, FLAG to GND .....................................-0.3V to +5V
SETB, SETS, SETI to GND ...........................-0.3V to (VIN + 0.3V)
IN to OUT ...............................................................................±5V
OUT Short-Circuit Duration ........................................Continuous
Continuous Switch Current .................................................1.75A
Current into any Pin (Except IN, OUT)..............................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin TDFN (derate 18.2mW/°C above +70°C)...455mW (T833-1)
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Human Body Model ESD Protection ....................................±2kV
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
(VIN = 2.25V to 4.5V, COUT = 2.2µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Operating Voltage Range
Undervoltage Lockout
SYMBOL
CONDITIONS
VIN
VUVLO
MIN
VIN rising
1.6
Undervoltage Lockout Hysteresis
Quiescent Current
Shutdown Current
Current Limit
2
TYP
2.25
MAX
UNITS
4.5
V
2.0
125
IQ
ISHDN
ILIM
V
mV
IOUT = 0, switch on, RSETI = 0Ω (ILIMIT = 1.5A)
35
85
IOUT = 0, switch on, RSETI = 200.9kΩ
(ILIMIT = 0.56A)
95
135
IOUT = 0, switch on, RSETI = 1500kΩ
(ILIMIT = 0.075A)
75
120
VIN = 3.6V, VON = 0, VOUT = 0V,
TA = +25°C
0.1
VIN = 3.6V, VON = 0, VOUT = 0V,
TA = +85°C
13.5
VIN = 4.0V, VON = 0, VOUT = 0V,
TA = +25°C
0.12
VIN = 4.0V, VON = 0, VOUT = 0V,
TA = +85°C
18
µA
µA
VOUT = 0V, RSETI = 0Ω (VIN = 2.25 to 4.0V)
1.35
1.50
1.67
VOUT = 0V, RSETI = 200.9kΩ
(VIN = 2.25 to 4.0V)
537
590
640
VOUT = 0V, RSETI = 1500kΩ
(VIN = 2.25 to 3.6V)
73
79.5
85.5
VOUT = 0V, RSETI = 1500kΩ
(VIN = 2.25 to 4.0V)
73
80
87
A
mA
_______________________________________________________________________________________
0.075A to 1.5A, Programmable
Current-Limit Switch
(VIN = 2.25V to 4.5V, COUT = 2.2µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
0.075A ≤ ILIMIT ≤ 1.5A, VOUT = 0V
RSETI ILIM Product
Switch Dropout Voltage (Note 2)
Forward-Off Switch Leakage
Current
Reverse Leakage Current
(Device Disabled)
Reverse Leakage Current
(Device Enabled)
IOUT(OFF)
IINR(OFF)
IINR(OFF)
MIN
TYP
MAX
UNITS
101
112.5
124
kV
VON = VIN = 3V, IOUT = 0.9 x ILIMIT(min),
RSETI = 0Ω (typical ILIMIT = 1.5A)
290
VON = VIN = 3V, IOUT = 0.33 x ILIMIT(min),
RSETI = 0Ω (typical ILIMIT = 1.5A)
105
VON = VIN = 3V, IOUT = 0.9 x ILIMIT(min),
RSETI = 200.9kΩ (typical ILIMIT = 0.56A)
245
VIN = 3.6V, VON = 0V, VOUT = 0V,
TA = +25°C
0.1
VIN = 3.6V, VON = 0V, VOUT = 0V,
TA = +85°C
13.5
VIN = 4.0V, VON = 0V, VOUT = 0V,
TA = +25°C
0.12
VIN = 4.0V, VON = 0V, VOUT = 0V,
TA = +85°C
18
VIN = 0V, VOUT = 3.6V, VON = 0V,
TA = +25°C
0.1
VIN = 0V, VOUT = 3.6V, VON = 0V,
TA = +85°C
13.8
VIN = 0V, VOUT = 4.0V, VON = 0V,
TA = +25°C
0.125
VIN = 0V, VOUT = 4.0V, VON = 0V,
TA = +85°C
18
mV
µA
µA
VIN = 0V, VOUT = 3.6V, VON = VOUT,
TA = +25°C
0.17
VIN = 0V, VOUT = 3.6V, VON = VOUT,
TA = +85°C
30
VIN = 0V, VOUT = 4.0V, VON = VOUT,
TA = +25°C
0.22
VIN = 0V, VOUT = 4.0V, VON = VOUT,
TA = +85°C
40
µA
ON LOGIC
ON Logic-High Voltage
VIH
ON Logic-Low Voltage
VIL
1.4
V
0.6
V
_______________________________________________________________________________________
3
MAX4766
ELECTRICAL CHARACTERISTICS (continued)
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 2.25V to 4.5V, COUT = 2.2µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
FLAG OUTPUT LOGIC
FLAG Output Logic-Low Voltage
VOL
ISINK = 1mA
FLAG Output High Leakage Current
VIN = V FLAG = 5.5V
0.4
V
1
µA
THERMAL PROTECTION
Thermal Shutdown
VIN = 3.3V, junction temperature rising
150
°C
Thermal Shutdown Hysteresis
VIN = 3.3V
15
°C
DYNAMIC
Turn-On Time (Note 3)
Turn-Off Time
TSS
CSETS = 0.01µF
9
17.5
ms
TOFF
VON from high to low; RL = 10Ω, RSET = 0,
VIN = 3.3V
75
150
µs
VIN = 4V, RSET = 0Ω, output high and then
short-circuit applied
1
Current-Limit Reaction Time
Blanking Time
tBLANK
5
CSETB = 0.01µF
Retry Time
µs
3.5
6.75
11.5
ms
225
420
700
ms
Note 1: All parameters tested at TA = +25°C. Limits through the temperature range are guaranteed by design.
Note 2: Not production tested. Guaranteed by design.
Note 3: Turn-on time (also called soft-start time) is defined as the difference in the time between when the output crosses 10%, and
90% of the final output voltage.
Typical Operating Characteristics
(VIN = 3.3V, COUT = 2.2µF, RSETI = 0kΩ, TA = +25°C, unless otherwise noted.)
CURRENT LIMIT
vs. SUPPLY VOLTAGE
CURRENT LIMIT
vs. TEMPERATURE
VCC = 3V
9
CURRENT LIMIT (A)
1.50
BLANKING TIME (ms)
1.55
1.55
1.50
MAX4766 toc03
10
MAX4766 toc02
VCC = 3V
BLANKING TIME
vs. TEMPERATURE
1.60
MAX4766 toc01
1.60
CURRENT LIMIT (A)
MAX4766
0.075A to 1.5A, Programmable
Current-Limit Switch
8
7
1.45
1.45
6
1.40
1.40
2.25
3.00
3.75
SUPPLY VOLTAGE (V)
4
4.50
-40
-15
10
35
TEMPERATURE (°C)
60
85
5
-40
-15
10
35
TEMPERATURE (°C)
_______________________________________________________________________________________
60
85
0.075A to 1.5A, Programmable
Current-Limit Switch
CURRENT-LIMIT RESPONSE
CURRENT-LIMIT RESPONSE
MAX4766 toc04a
MAX4766 toc04b
2A OF LOAD APPLIED
AT THE OUTPUT
SUDDEN SHORT
APPLIED AT THE
OUTPUT
OUTPUT
2V/div
OUTPUT
2V/div
OUTPUT LOAD
1A/div
OUTPUT LOAD
2A/div
10µs/div
10µs/div
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
80
70
RISET OPEN
2.25
3.00
RISET OPEN
4
3
2
1
0
-40
-15
10
35
60
-40
85
-15
10
35
60
85
VOLTAGE (V)
TEMPERATURE (°C)
SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
REVERSE SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
REVERSE SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
2
1
VON = 0V
4
3
2
1
0
0
-15
10
35
TEMPERATURE (°C)
60
85
-40
-15
10
35
TEMPERATURE (°C)
60
85
8
MAX4766 toc10
MAX4766 toc09
MAX4766 toc08
3
5
REVERSE SHUTDOWN LEAKAGE CURRENT (µA)
VOLTAGE (V)
4
-40
MAX4766 toc07
MAX4766 toc06
RISET = 0Ω
60
50
40
30
20
4.50
3.75
5
SHUTDOWN LEAKAGE CURRENT (µA)
110
100
90
80
70
5
SHUTDOWN SUPPLY CURRENT ( µA)
SUPPLY CURRENT ( µA)
100
90
60
50
40
30
20
140
130
120
MAX4766 toc05
RISET = 0Ω
130
120
110
REVERSE SHUTDOWN LEAKAGE CURRENT (µA)
SUPPLY CURRENT ( µA)
140
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
VON = VCC
7
6
5
4
3
2
1
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAX4766
Typical Operating Characteristics (continued)
(VIN = 3.3V, COUT = 2.2µF, RSETI = 0kΩ, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VIN = 3.3V, COUT = 2.2µF, RSETI = 0kΩ, TA = +25°C, unless otherwise noted.)
TURN-ON TIME
TURN-OFF TIME
MAX4766 toc11
MAX4766 toc12
INPUT
INPUT
OUTPUT
OUTPUT
4ms/div
2ms/div
FLAG RESPONSE TIME
(OVERLOAD CONDITION)
SWITCH DROPOUT VOLTAGE
vs. TEMPERATURE
MAX4766 toc13
VCC = 3V
215
OUTPUT LOAD
1A/div
OUTPUT
2V/div
FLAG
5V/div
MAX4766 toc14
225
DROPOUT VOLTAGE (mV)
MAX4766
0.075A to 1.5A, Programmable
Current-Limit Switch
205
195
185
175
165
155
145
135
125
2ms/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
6
_______________________________________________________________________________________
0.075A to 1.5A, Programmable
Current-Limit Switch
PIN
MAX4766B/C
MAX4766A
1
1
NAME
FUNCTION
SETB
Blanking Time Adjust. Connect a capacitor from SETB to ground to program the blanking time.
See the Adjustable Blanking Time section. Leave SETB floating to choose 1ms minimum preset
blanking time.
2
—
FLAG
Fault-Present-Indicator Output. FLAG is an open-drain output and goes low when the
overload fault duration exceeds the blanking time, reverse current is detected, or the device
is in thermal shutdown. Connect FLAG to IN with a 5kΩ resistor. For latch-off (MAX4766B)
versions, the switch is turned off and FLAG output goes low after the blanking time. For the
continuous version (MAX4766C), FLAG does not wait for the blanking time and goes low as
soon as the current-limit threshold is reached.
—
2
N.C.
Not Connected
3
3
SETI
Current-Limit Adjust. To program the current limit, connect a resistor from SETI to ground.
See the Setting the Current Limit Section for more detail. Shorting SETI to ground sets the
device for maximum current limit of 1.5A.
4
4
OUT
5
5
IN
6
6
SETS
7
7
ON
8
8
GND
Switch Output. Bypass OUT with a 2.2µF capacitor to ground.
Power Input. Bypass IN with a 2.2µF or greater ceramic capacitor to ground. Larger capacitors
may be needed to prevent large load transients from dragging down the supply voltage.
Soft-Start Adjust. Connect a capacitor from SETS to ground to program the soft-start time.
See the Adjustable Soft-Start section. Leave SETS floating to choose 1ms minimum preset
soft-start time.
Active-High Switch On Input. Drive ON high to turn the switch on.
Ground
REVERSECURRENT
PROTECTION
MAX4766
IN
OUT
THERMAL
SHUTDOWN
UVLO
CONTROL
LOGIC
BUFFER
FLAG (MAX4766B/C)
SETB
TBLANK
SOFT-START
SETS
BANDGAP
REFERENCE
CURRENT
LIMIT
SETI
V TO I
ON
Figure 1. Functional Diagram
_______________________________________________________________________________________
7
MAX4766
Pin Description
MAX4766
0.075A to 1.5A, Programmable
Current-Limit Switch
Programmable Blanking Time
(MAX4766A/MAX4766B)
Detailed Description
The MAX4766 is a current-limit switch that operates
from a 2.25V to 4.5V input voltage range and has a programmable current limit from 0.075A to 1.5A with a
±10% accurate current limit. The device features an
adjustable blanking time, an adjustable soft-start time,
and an output indicator, FLAG, that notifies the processor when a fault condition is present (Figure 1). The
MAX4766 is available in latch-off, autoretry, and continuous current-limit versions (see the Selector Guide).
Programmable Current Limit
A resistor from SETI to GND programs the current limit
for the switch (see the Setting the Current Limit section).
The MAX4766 increases the pass transistor’s gate drive
when the programmed current-limit value is reached. If
the load current exceeds the current limit for longer than
the tBLANK period, the switch either goes into autoretry,
latches off, or stays in the continuous mode until the
thermal limit is reached.
The adjustable fault-blanking time feature of the
MAX4766 ensures that no fault signal asserts during
power-up or when there is a momentary short caused
by hot-swapping a capacitive load. An external capacitor from SETB to GND sets the blanking time. When a
short or load transient causes the device to enter current
limit, an internal counter monitors the duration of the
fault after the soft-start time elapses. For the MAX4766B,
FLAG signal asserts low when load faults exceed the
programmed blanking time (tBLANK). If the fault condition is removed before the programmed blanking time
period has elapsed, the timer resets and the FLAG signal does not assert (see Figures 2a and 2b). Only current-limit and short-circuit faults are blanked.
Table 1. Blanking Time vs. Capacitor Values
CSETB (µF)
TYPICAL BLANKING TIME
(ms)
Open
0.01
0.025
0.05
0.075
0.1
0.125
0.150
0.175
0.2
0.25
1
8
19
35
50
65
80
100
115
125
150
Programmable Soft-Start
The MAX4766 features an adjustable soft-start time to
control the output voltage ramp rate, thereby limiting the
inrush surge current. An external capacitor from SETS to
GND sets the soft-start time. The value of the capacitor
directly determines the typical soft-start time. Use the
following formula to determine the soft-start time:
Soft − Start(ms) =
CSETS
× 1ms
1nF
Leave SETS floating to choose 1ms minimum preset
soft-start time.
tBLANK
tBLANK
tBLANK
LOAD
CURRENT
LOAD
CURRENT
ON
SWITCH
STATUS
OFF
ON
SWITCH
STATUS
OFF
ON
VOLTAGE
FLAG
STATUS
Figure 2a. Latch-Off Fault Blanking (Toggling ON)
8
tBLANK
VIN
UNLO
FLAG PIN
STATUS
Figure 2b. Latch-Off Fault Blanking (Cycling IN Below UVLO)
_______________________________________________________________________________________
0.075A to 1.5A, Programmable
Current-Limit Switch
tBLANK
tBLANK
tRETRY
tBLANK
CURRENT
LIMIT
SHORT
REMOVED
LOAD
CURRENT
ON
SWITCH
STATUS
OFF
Reverse-Current Protection
Figure 3. Autoretry Fault-Blanking Diagram
Autoretry (MAX4766A)
When the forward current-limit threshold is exceeded,
the tBLANK timer begins counting (Figure 3). The timer
resets if the overcurrent condition disappears before
tBLANK has elapsed. A retry time delay (tRETRY) starts
immediately after tBLANK has elapsed and during that
time, the switch turns off. At the end of tRETRY, the
switch turns on again. If the fault still exists, the cycle
repeats. If the fault has been removed, the switch stays
on. The autoretry feature saves system power in the
case of an overcurrent or short-circuit condition. During
tBLANK, when the switch is on, the supply current is at
the current limit. During tRETRY, when the switch is off,
the current through the switch is zero. Instead of
observing the full load current, the switch sees the
equivalent load current times duty cycle or:
⎛
⎞
tBLANK
⎟
⎝ tBLANK + tRETRY ⎠
ISUPPLY = ILOAD ⎜
With a typical t BLANK = 15ms and typical t RETRY =
150ms, the duty cycle is 10%, which results in a 90%
power savings over the switch being on the entire time.
Continuous Current Limit
In the continuous current-limit version of the MAX4766,
the output stays at the current limit until the output load
reduces. In this case, FLAG asserts as soon as there is
current limit without waiting for blanking time and
deasserts as soon as a short-circuit condition is
removed. In this current mode, if the thermal power rating of the package is exceeded, the device will go into
thermal shutdown and will not operate until the die temperature has cooled.
The MAX4766 features a reverse-current protection circuitry to limit the current back flow to 1µA when the output voltage exceeds the input voltage by a 100mV.
During this period, the switch turns off and FLAG
asserts (MAX4766B/C) without waiting for tBLANK time to
elapse. If at this point the output voltage drops below
input +100mV, the switch turns on and FLAG deasserts
(MAX4766B/C).
Thermal Shutdown
A thermal-shutdown circuitry protects the devices from
overheating. The switch turns off and FLAG goes
(MAX4766B/C) low immediately (no fault blanking)
when the junction temperature exceeds +150°C. The
MAX4766B (latch-off) does not turn on again until ON is
cycled from high to low to high. The MAX4766A
(autoretry) and the MAX4766C (continuous) turn the
switch on again after the device temperature drops
approximately +15°C.
FLAG Indicator
FLAG is an open-drain fault indicator output and
requires an external pullup resistor to a DC supply
(usually IN). FLAG goes low when any of the following
conditions occur:
• The device is in current limit for more than the faultblanking period in the case of MAX4766B.
• The device is in current limit in the case of MAX4766C
(no blanking time).
• The switch is in autoretry mode.
• The OUT voltage is above the IN voltage by more
than 100mV.
• The die temperature exceeds the thermal-shutdown
temperature limit of the +15°C.
_______________________________________________________________________________________
9
MAX4766
Latch-Off
When the forward current-limit threshold is exceeded,
tBLANK timer begins counting. The timer resets if the
overcurrent condition disappears before tBLANK has
elapsed. The switch turns off and FLAG asserts if the
overcurrent condition continues beyond the blanking
time. Reset the switch by either toggling ON (Figure 2a)
or cycling the input voltage (Figure 2b).
MAX4766
0.075A to 1.5A, Programmable
Current-Limit Switch
Table 2. Current Limit vs. Resistor Values
RSETI (kΩ)
TYPICAL CURRENT LIMIT (A)
1500
0.075
1125
0.1
750
0.15
562.5
0.2
⎛ IFWD _ MIN × tBLANK ⎞
⎟
VIN
⎝
⎠
CMAX = ⎜
330
0.375
200.9
0.56
Layout and Thermal Dissipation
150
0.75
To optimize the switch response time to output shortcircuit 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. 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 maximum 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:
112.5
1.0
90
1.25
80.35
1.4
≤75
1.5
Applications Information
Setting the Current Limit
A resistor from SETI to ground programs the currentlimit value for the MAX4766. Table 2 lists various current limits set by different resistor values. Use the
following formula to calculate the current limit:
⎛ 112.5kV ⎞
⎟ kΩ
⎝ ILIM( A) ⎠
RSETI = ⎜
Input Capacitor
Connect a capacitor from IN to ground to limit the input
voltage drop during momentary output short-circuit conditions. A 2.2µF ceramic capacitor with less than 0.2Ω
ESR is adequate for most applications. Higher capacitor
values further reduce the voltage drop at the input.
Output Capacitor
For stable operation over the full temperature range
and over the full-programmable current-limit range,
use a 2.2µF capacitor with less than 0.2Ω ESR from
OUT to ground.
10
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:
⎛ VIN _ MAX × IOUT _ MAX × tBLANK ⎞
⎟
tRETRY + tBLANK
⎝
⎠
PMAX = ⎜
Attention must be given to the latch-off version of the
MAX4766 where the latch-off condition must be manually reset by toggling ON from high to low. If the latchoff 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.
Chip Information
TRANSISTOR COUNT: 1544
PROCESS: CMOS
______________________________________________________________________________________
0.075A to 1.5A, Programmable
Current-Limit Switch
6, 8, &10L, DFN THIN.EPS
D
N
PIN 1
INDEX
AREA
E
E2
DETAIL A
CL
CL
L
A
L
e
e
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
21-0137
F
1
2
______________________________________________________________________________________
11
MAX4766
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.)
MAX4766
0.075A to 1.5A, Programmable
Current-Limit Switch
Package Information (continued)
(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.)
COMMON DIMENSIONS
SYMBOL
A
MIN.
0.70
0.80
D
2.90
3.10
E
2.90
3.10
A1
L
0.00
0.05
k
MAX.
0.40
0.20
0.25 MIN.
A2
0.20 REF.
PACKAGE VARIATIONS
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
T633-1
6
1.50±0.10
2.30±0.10
0.95 BSC
MO229 / WEEA
0.40±0.05
1.90 REF
T833-1
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
T1033-1
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
T1433-1
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.03
2.40 REF
T1433-2
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.03
2.40 REF
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
F
2
2
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.