MAXIM MAX4995A, MAX4995AF, MAX4995AL, MAX4995B, MAX4995C User Manual

General Description

The MAX4995A/MAX4995AF/MAX4995AL/MAX4995B/
MAX4995C programmable current-limit switches fea­ture internal current limiting to prevent damage to host
devices due to faulty load conditions. These analog
switches feature a low 130mΩ (typ) on-resistance and
operate from a +1.7V to +5.5V input voltage range. The
current limit is adjustable from 50mA to 600mA, making
these devices ideal for SDIO (secure digital input/out­put) and other load-switching applications.

Each device in the family handles an overcurrent event
differently depending on the option selected. The
MAX4995A/MAX4995AF/MAX4995AL go into an
autoretry mode, the MAX4995B latches off the switch,
and the MAX4995C places the device in a continuous
current-limit mode. Additional safety features include
thermal shutdown to prevent overheating and reverse­current blocking to prevent current from being driven
back into the source.

The MAX4995A/MAX4995AF/MAX4995AL/MAX4995B/
MAX4995C are available in a tiny 10-pin, 1.4mm x

1.8mm UTQFN, a 6-pin SOT23, or an 8-pin, 2mm x
2mm TDFN package and operate over the -40°C to
+125°C extended temperature range.

Features

♦ 50mA to 600mA Programmable Current Limit

♦ ±10% Accurate Current Limit
♦ Overload FLAG Threshold

♦ Low Dropout Voltage

♦ Short-Circuit Protection

♦ Thermal Shutdown

♦ Reverse-Current Protection

♦ 170µA (typ) Supply Current

♦ +1.7V to +5.5V Supply Voltage Range

♦ Tiny 10-Pin, 1.4mm x 1.8mm UTQFN Package

Applications

MAX4995A/AF/AL/MAX4995B/MAX4995C

50mA to 600mA Programmable

Current-Limit Switches

________________________________________________________________

Maxim Integrated Products

1

Ordering Information/Selector Guide

19-4363; Rev 2; 2/10

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.

All devices operate over the -40°C to +125°C temperature range.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*

Future product. Contact factory for availability.

**

EP = Exposed pad.

Typical Operating Circuit appears at end of data sheet.

SDIO Ports

USB Ports

Notebook VGA Ports

GPS

Cell Phones

MP3 Players

UTCA/ATCA Platforms

PART PIN-PACKAGE ON POLARITY

MAX4995AAUT+T* 6 SOT23 Active-High Autoretr y Normal +ACNZ

MAX4995AAVB+T 10 UTQFN Active-High Autoretry Normal +AAM

MAX4995AATA+T 8 TDFN-EP** Active-High Autoretr y Normal +ABL

MAX4995AFAUT+T* 6 SOT23 Active-High Autoretry Fast +ACOE

MAX4995AFAVB+T 10 UTQFN Active-High Autoretr y Fast +AAR

MAX4995AFATA+T* 8 TDFN-EP** Acti ve-High Autoretry Fast + ACO

MAX4995ALAUT+T* 6 SOT23 Active-Low Autoretry Normal +ACDA

MAX4995ALAVB+T 10 UTQFN Active-Low Autoretry Normal +AAN

MAX4995ALATA+T* 8 TDFN-EP** Active-Low Autoretry Normal +ABM

MAX4995BAUT+T* 6 SOT23 Active-High Latchoff Normal +ACDB

MAX4995BAVB+T 10 UTQFN Active-High Latchoff Normal +AAO

MAX4995BATA+T* 8 TDFN-EP** Active-High Latchoff Normal +ABN

MAX4995CAUT+T* 6 SOT23 Active-High Cont inuous Normal +ACOD

MAX4995CAVB+T 10 UTQFN Active-High Continuou s Normal + AAQ

MAX4995CATA+T* 8 TDFN-EP** Active-High Continuous Normal + ABP

OVERCURRENT

RESPONSE

SHORT-CIRCUIT

RESPONSE

TOP MARK

MAX4995A/AF/AL/MAX4995B/MAX4995C

50mA to 600mA Programmable
Current-Limit Switches

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.

IN, ON, ON, FLAG, OUT, and SETI to GND .............-0.3V to +6V

Current into Any Pin (Except IN, OUT)................................20mA

OUT Short Circuit to GND .................................................800mA

Continuous Power Dissipation (T

A

= +70°C) (Note 1)

10-Pin UTQFN (derate 6.99mW/ °C above T

A

= +70°C) ..559mW

6-Pin SOT23 (derate 13.4mW/ °C above T

A

= +70°C)...1072.4mW

8-Pin TDFN (derate 11.9mW/ °C above T

A

= +70°C)....953.5mW

Junction-to-Ambient Thermal Resistance (θ

JA

)

(Note 2).....................................................................143.1°C/W

Operating Temperature Range .........................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

Note 1: These power limits are defined by the thermal characteristics of the package, maximum function temperature (+150°C), and

the JEDEC51-7 defined setup. Maximum power dissipation could be lower, limited by the thermal-shutdown protection
included in this IC.

Note 2: 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

(VIN= +1.7V to +5.5V, R

SETI

= 94.3kΩ, CIN= 1µF, and TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at VIN= +3.3V,

T

A

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SUPPLY OPERATION

Operating Voltage VIN 1.7 5.5 V

Quiescent Current IQ I

Latchoff Current I

Shutdown Forward Current I

Shutdown Reverse Current I

INTERNAL FET

Switch-On Resistance R

Normalized Current-Limit Accuracy

(R

+ 2.48) x I

SETI

LIM

Reverse Blocking Current

Reverse Blocking Threshold

FLAG Assertion Drop Voltage
Threshold

ON, ON INPUT

ON, ON Input Leakage I
ON, ON Input Logic-High Voltage V
ON, ON Input Logic-Low Voltage V

= 0, switch on, VIN= 3.3V 170 300 μA

OUT

LATCH

SHDN VON

RSHDN

Product

VIN = 3.3V, I
fault (MAX4995B)

V
V

VIN = 3.3V, I

ON

I

LIM

V

I

LIM

V

V

= 0, VON = VIN, VIN= 5.5V, V

= 0, VON = VIN, VIN= 1.7V,

ON

= 5.5V (current into OUT)

OUT

= 50mA to 600mA, VIN - V

= 3.3V (Note 3)

IN

= 50mA to 600mA, VIN - V

= 3.3V

IN

OUT

limit shutdown

V

OUT

turns on

V

LEAK

Increase (VIN - V

FA

asserts, I

VON, VON = VINor GND -1 +1 μA

1.6 V

IH

0.4 V

IL

> VIN+ 300mV after reverse-current-

= VIN+ 300mV, OUT falling until switch

= 0 after an overcurrent

OUT

lower than I

OUT

) drop until FLAG

OUT

limiting, VIN = 3.3V

OUT

LIM

8 15 μA

= 0 0.01 5 μA

OUT

0.01 1 μA

= 1V,

OUT

OUT

= 1V,

0.9 1 1.1 —

26138 29042 31946 V

10 μA

35 110 210 mV

130 350 m

650 mV

MAX4995A/AF/AL/MAX4995B/MAX4995C

50mA to 600mA Programmable

Current-Limit Switches

_______________________________________________________________________________________ 3

Note 3: I

LIM

is forward current limit.

Note 4: Turn-on time and turn-off time are defined as the difference in the time between when the output crosses 10% and 90%

of the final output voltage.

Note 5: Blanking time and retry time are generated by the same oscillator. Therefore, the ratio of

is a constant value of 32. See Figures 2 and 3.

ELECTRICAL CHARACTERISTICS (continued)

(VIN= +1.7V to +5.5V, R

SETI

= 94.3kΩ, CIN= 1µF, and TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at VIN= +3.3V,

T

A

= +25°C.)

Figure 1. Timing Diagram for Measuring Turn-On Time (tSS) and Turn-Off Time (t

OFF

).

FLAG OUTPUT

FLAG Output Logic-Low Voltage I
FLAG Output Leakage Current VIN= V

DYNAMIC

Turn-On Time t

Turn-Off Time t

Current-Limit Reaction Time t

Blanking Time t

Retry Time t

THERMAL PROTECTION

Thermal Shutdown +150 °C

Thermal-Shutdown Hysteresis 15 °C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

I (mA)

LIM

=

= 1mA 0.4 V

SINK

= 5.5V, FLAG deasserted 1 μA

FLAG

2

9042( )

V

R(k 2.48k

SETI

+

)()

ΩΩ

SS

OFF

LIM

BLANK

RETRY

VIN= 3.3V, C
(Note 4)

Switch from on to off, VIN= 3.3V, C
R

= 20 , Figure 1 (Note 4)

L

VIN= 3.3V, R
578k , output high and
then short-circuit
applied

(Note 5) 10 16.3 22.6 ms

MAX4995A/MAX4995AF/MAX4995AL (Note 5) 320 723.2 ms

= 1μF, RL = 20 , Figure 1,

OUT

=

SETI

MAX4995A/AL/B/C 5

MAX4995AF 1.5

OUT

= 1μF,

120 μs

120 μs

μs

t

RETRY

t

BLANK

t

SS

90%

V

OUT

10%

90%

t

10%

OFF

MAX4995A/AF/AL/MAX4995B/MAX4995C

50mA to 600mA Programmable
Current-Limit Switches

4 _______________________________________________________________________________________

μ

μ

Typical Operating Characteristics

(VIN= +3.3V, CIN= 1µF, C

OUT

= 1µF, R

SETI

= 94.2kΩ, TA= +25°C, unless otherwise noted.)

CURRENT LIMIT

vs. SUPPLY VOLTAGE

315

MAX4995AL

310

305

300

295

CURRENT LIMIT (mA)

290

285

2.0 3.02.5 4.5 5.03.5 4.0

1.5 5.5
SUPPLY VOLTAGE (V)

CURRENT-LIMIT RESPONSE (MAX4995A)

SUDDEN SHORT

APPLIED AT OUTPUT

MAX4995A toc03

MAX4995A toc01

V

OUT

(2V/div)

I

OUT

(10A/div)

NORMALIZED CURRENT LIMIT

vs. TEMPERATURE

1.100
MAX4995AL

1.075

1.050

1.025

1.000

0.975

0.950

NORMALIZED CURRENT LIMIT

0.925

0.900

-25 5-10 20

-40 50 8065 95 11035 125
TEMPERATURE (°C)

CURRENT-LIMIT RESPONSE (MAX4995AF)

SUDDEN SHORT

APPLIED AT OUTPUT

MAX4995A toc04

MAX4995A toc02

V

OUT

(2V/div)

I

OUT

(10A/div)

10

s/div

s/div

10

QUIESCENT SUPPLY CURRENT

CURRENT-LIMIT RESPONSE

4ms/div

MAX4995A toc05

R

LOAD

= 8Ω

V

OUT

(2V/div)

I

OUT

(100mA/div)

300

280

260

240

220

200

180

160

140

QUIESCENT SUPPLY CURRENT (μA)

120

100

1.5 5.5

vs. SUPPLY VOLTAGE

MAX4995A

2.0 3.02.5 4.5 5.03.5 4.0
SUPPLY VOLTAGE (V)

MAX4995A toc06