Datasheet

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General Description

The MAX4789–MAX4794 family of 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 2.3V to 5.5V input voltage range. They are avail-

able with guaranteed 200mA, 250mA, and 300mA cur-

rent 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 MAX4789, MAX4791, and MAX4793 enter a latch-

off 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 MAX4790, MAX4792, and MAX4794 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 remains

on after the overload condition disappears.

The MAX4789–MAX4794 are available in 6-pin 3mm x

3mm TDFN and tiny space-saving 4-pin SOT143 pack-

ages. The MAX4789/MAX4790/MAX4791/MAX4793 are

also available in a tiny 5-pin SOT23 package. For lower

current current-limiting switches, refer to the MAX4785–

MAX4788 data sheet.

Applications

PDAs and Palmtop Devices

Cell Phones

GPS Systems

Handheld Devices

SDIO

Features

♦ Guaranteed Current Limit: 200mA, 250mA, 300mA

♦ Thermal-Shutdown Protection

♦ Reverse Current Protection

♦ 0.2Ω On-Resistance

♦ 14ms Guaranteed Blanking Time

♦ FLAG Function (MAX4789/MAX4791/MAX4793)

♦ 80µA Supply Current

♦ 8µA Latch-Off Current

(MAX4789/MAX4791/MAX4793)

♦ 0.01µA Shutdown Current

♦ 2.3V to 5.5V Supply Range

♦ Undervoltage Lockout

♦ Fast Current-Limit Response Time (5µs)

♦ TDFN and SOT23/SOT143 Packages

MAX4789–MAX4794

200mA/250mA/300mA Current-Limit Switches

________________________________________________________________

Maxim Integrated Products

Ordering Information

2.3V TO 5.5V

OUT

FLAG

GND

μP

TO SDIO PORT

MAX4789

MAX4791

MAX4793

Typical Operating Circuit

19-2663; Rev 3; 10/08

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.

*EP = Exposed paddle.

+Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

Ordering Information continued at end of data sheet.

Selector Guide appears at end of data sheet.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4789EUS+T

-40°C to +85°C 4 SOT143

KAFE

MAX4789EUK+T

-40°C to +85°C

5 SOT23

AEAC

MAX4789ETT+

-40°C to +85°C 6 TD FN - E P *

ABO

MAX4790EUS+T

-40°C to +85°C 4 SOT143

KAFF

MAX4790ETT+

-40°C to +85°C 6 TDFN-EP

ABP

GND

FLAG

Pin Configurations continued at end of data sheet.

15OUTIN

MAX4789

MAX4791

MAX4793

SOT23

TOP VIEW

ON ON

14INOUT

MAX4789–

MAX4794

SOT143

23GND

Pin Configurations

Summary of content (11 pages)

PAGE 1
9-2663; Rev 3; 10/08 200mA/250mA/300mA Current-Limit Switches The MAX4789–MAX4794 family of 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 2.3V to 5.5V input voltage range. They are available with guaranteed 200mA, 250mA, and 300mA current limits, making them ideal for SDIO and other load switching applications.
PAGE 2
MAX4789–MAX4794 200mA/250mA/300mA Current-Limit Switches ABSOLUTE MAXIMUM RATINGS IN, ON, FLAG, OUT to GND .....................................-0.3V to +6V OUT Short Circuit to GND .................................Internally Limited Continuous Power Dissipation (TA = +70°C) 4-Pin SOT143 (derate 4.0mW/°C above +70°C)..........320mW 5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW 6-Pin TDFN (derate 24.4mW/°C above +70°C).........1951.2mW Operating Temperature Range ...........................
PAGE 3
200mA/250mA/300mA Current-Limit Switches (VIN = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN = 3.3V, TA = +25°C.) (Note 1) PARAMETER SYMBOL Blanking Time CONDITIONS tBLANK MIN Overcurrent fault (Figures 2, 3) Short-Circuit Current-Limit Response Time TYP 14 VON = VIN = 3.3V, short circuit applied to OUT Retry Time (Note 4) tRETRY MAX UNITS 60 ms 5 MAX4790/MAX4792/MAX4794 (Figure 2) µs 98 420 ms Note 1: All parts are 100% tested at +25°C.
PAGE 4
Typical Operating Characteristics (continued) (VIN = 3.3V, TA = +25°C, unless otherwise noted.) NORMALIZED ON-RESISTANCE vs. TEMPERATURE OUTPUT CURRENT vs. OUTPUT VOLTAGE 1.0 VIN = 5V 0.8 0.6 0.4 MAX4789 toc08 450 400 OUTPUT CURRENT (mA) 1.2 NORMALIZED RON 500 MAX4789 toc07 1.4 MAX4793/MAX4794 350 300 MAX4789/MAX4790 250 MAX4791/MAX4792 200 150 100 0.2 50 0 0 -15 10 35 60 85 VIN - VOUT (V) SWITCH TURN-ON/OFF TIMES vs. TEMPERATURE FLAG-BLANKING TIMEOUT vs.
PAGE 5
200mA/250mA/300mA Current-Limit Switches CURRENT-LIMIT RESPONSE (OUT SHORTED TO GND) SWITCH TURN-ON TIME RESPONSE MAX4789 toc13 CIN = 1μF COUT = 1μF MAX4789 toc14 VIN 2V/div VON 1V/div VOUT 2V/div IOUT 10mA/div IOUT 5A/div 40μs/div 100μs/div FLAG-BLANKING RESPONSE SWITCH TURN-OFF TIME RESPONSE MAX4789 toc16 MAX4789 toc15 VON 2V/div VIN 2V/div VON 2V/div FLAG 2V/div IOUT 10mA/div IOUT 100mA/div 4ms/div 200ns/div Pin Description PIN TDFN-EP MAX4789 MAX4791 MAX4793 TDFN-EP MAX4790 MAX4792
PAGE 6
MAX4789–MAX4794 200mA/250mA/300mA Current-Limit Switches REVERSE CURRENT DETECTOR MAX4789/MAX4791/ MAX4793 ONLY FLAG BLANKING TIME CIRCUITRY N FORWARD CURRENT DETECTOR N IN UNDERVOLTAGE LOCKOUT ON OUT +2.0V LOGIC AUTORETRY MAX4789–MAX4794 GND Figure 1. Functional Diagram Detailed Description The MAX4789–MAX4794 are forward/reverse currentlimited switches that operate from a 2.3V to 5.
PAGE 7
200mA/250mA/300mA Current-Limit Switches ON FAULT Low X OFF Shutdown High Undervoltage Lockout OFF Shutdown High Thermal OFF immediately (tBLANK period does not apply) Latch off OFF after tBLANK period has elapsed ON during tBLANK period, OFF during tRETRY period for the MAX4790, MAX4792, and MAX4794; cycle repeats until fault is removed Latch off High Current Limit SWITCH ON/OFF off. FLAG is an open-drain output transistor and requires an external pullup resistor from FLAG to IN.
PAGE 8
MAX4789–MAX4794 200mA/250mA/300mA Current-Limit Switches tBLANK the MAX4789–MAX4794 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.
PAGE 9
200mA/250mA/300mA Current-Limit Switches Ordering Information (continued) TEMP RANGE PINPACKAGE TOP MARK MAX4791EUS+T -40°C to +85°C 4 SOT143 KAFG MAX4791EUK+T -40°C to +85°C 5 SOT23 AEAE MAX4791EUK/V+T -40°C to +85°C 5 SOT23-5 AFGJ MAX4791ETT+ -40°C to +85°C 6 TDFN-EP* ABQ MAX4792EUS+T -40°C to +85°C 4 SOT143 KAFH MAX4792ETT+ -40°C to +85°C 6 TDFN-EP* ABR MAX4793EUS+T -40°C to +85°C 4 SOT143 KAFI MAX4793EUK+T -40°C to +85°C 5 SOT23 AEAG MAX4793ETT+ -40°C to +85°C 6 TDFN
PAGE 10
MAX4789–MAX4794 200mA/250mA/300mA Current-Limit Switches Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. 10 PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
PAGE 11
200mA/250mA/300mA Current-Limit Switches REVISION NUMBER REVISION DATE 2 2/05 Changed package description 3 10/08 Changed Ordering Information and Package Information. DESCRIPTION PAGES CHANGED ⎯ 1, 8–11 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.