MAXIM MAX4789, MAX4794 Technical data

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 avail­able with guaranteed 200mA, 250mA, 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 MAX4789, MAX4791, and MAX4793 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 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 thin QFN
and tiny space-saving 4-pin SOT143 packages. The
MAX4789/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

Hand-Held 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)

♦ Tiny QFN and SOT23/SOT143 Packages

MAX4789–MAX4794

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

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

2.3V TO 5.5V

IN

OUT

FLAG

GND

ON

µP

TO SDIO PORT

MAX4789
MAX4791
MAX4793

Typical Operating Circuit

19-2663; Rev 1; 8/03

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.

*EP = Exposed pad.

Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.

Pin Configurations

查询MAX4789供应商查询MAX4789供应商

PART TEMP RANGE PIN-PACKAGE

MAX4789EUS-T -40°C to +85°C 4 SOT143-4 KAFE

MAX4789EUK-T -40°C to +85°C 5 SOT23-5 AEAC

MAX4789ETT -40°C to +85°C 3 x 3 Thin QFN-EP* ABO

MAX4790EUS-T -40°C to +85°C 4 SOT143-4 KAFF

MAX4790ETT -40°C to +85°C 3 x 3 Thin QFN-EP ABP

TOP

MARK

TOP VIEW

15OUTIN

MAX4789

2

GND

ON ON

Pin Configurations continued at end of data sheet.

MAX4791
MAX4793

34

SOT23

FLAG

14INOUT

MAX4789–

MAX4794

23GND

SOT143

MAX4789–MAX4794

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

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(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)

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, FLAG, OUT to GND .....................................-0.3V to +6V

OUT Short Circuit to GND .................................Internally Limited

Continuous Power Dissipation (T

A

= +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 Thin QFN (derate 24.4mW/°C above +70°C)...1951.2mW

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

Operating Voltage V

Quiescent Current I

Latch-Off Current (Note 2) I

Shutdown Current I

Reverse Current Limit

ON Input Leakage VON = VIN or GND -1 +1 µA

Off Switch Leakage VON = 0V, V

Undervoltage Lockout UVLO Rising edge 1.8 2.2 V

Undervoltage Lockout Hysteresis 100 mV

On-Resistance R

ON Input Logic High Voltage V

ON Input Logic Low Voltage V

FLAG Output Logic Low Voltage I

FLAG Output High Leakage

Current

Thermal Shutdown 150 °C

Thermal-Shutdown Hysteresis 15 °C

DYNAMIC

Turn-On Time (Note 3)

Turn-Off Time (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IN

VON = VIN, I

Q

switch on

LATCH

SHDN

ON

VON = VIN, after an overcurrent fault
(MAX4789/MAX4791/MAX4793)

VON = 0V 0.01 1 µA

MAX4789/MAX4790 200 300

MAX4791/MAX4792 250 375Forward Current Limit

MAX4793/MAX4794 300 450

MAX4789/MAX4790 300

MAX4791/MAX4792 375

MAX4793/MAX4794 450

TA = +25°C, I

TA = - 40° C to + 85°C , I

IH

IL

= 1m A ( M AX 4789/M AX 4791/M AX 4793) 0.4 V

S IN K

VIN = V

FLAG

(MAX4789/MAX4791/MAX4793)

V

from low to high; I

ON

C

= 0.1µF

L

V

from high to low; I

ON

C

= 0.1µF

L

2.3 5.5 V

VIN = +2.3V to +5.0V 80 120

= 0,

OUT

= +5.0V to +5.5V 160

V

IN

815µA

= 0V 0.01 1 µA

OUT

= 100mA 0.2 0.4

OUT

= 100m A 0.5

OU T

2.0 V

0.8 V

= 5.5V

OUT

OUT

= 10mA,

= 10mA,

100 µs

40 ns

1µA

µA

mA

mA

Ω

MAX4789–MAX4794

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

_______________________________________________________________________________________ 3

Typical Operating Characteristics

(VIN= 3.3V, TA= +25°C, unless otherwise noted.)

Note 1: All parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation.
Note 2: Latch-off 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 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 4: Retry time is typically 7 times the blanking time.

ELECTRICAL CHARACTERISTICS (continued)

(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)

Blanking Time t

Short-Circuit Current-Limit
Response Time

Retry Time (Note 4) t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BLANK

RETRY

Overcurrent fault (Figures 2, 3) 14 60 ms

VON = VIN = 3.3V, short circuit applied to
OUT

5µs

MAX4790/MAX4792/MAX4794 (Figure 2) 98 420 ms

QUIESCENT SUPPLY CURRENT

vs. SUPPLY VOLTAGE

100

VON = VIN

90

80

70

60

50

40

30

SUPPLY CURRENT (µA)

20

10

0

2.0
SUPPLY VOLTAGE (V)

MAX4789 toc01

5.55.04.0 4.53.0 3.52.5

120

100

80

60

40

SUPPLY CURRENT (µA)

20

0

-40 85

vs. TEMPERATURE

VON = VIN

VIN = 5V

SUPPLY CURRENT

VIN = 3.3V

TEMPERATURE (°C)

LATCH-OFF CURRENT

vs. TEMPERATURE

15

VON = VIN

14
13

MAX4789 toc02

12
11
10

9
8
7
6

LATCH-OFF (µA)

5
4
3
2
1
0

603510-15

-40 85

VIN = 5V

VIN = 3.3V

603510-15

TEMPERATURE (°C)

MAX4789 toc03

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

100

10

1

0.1

0.01

SHUTDOWN SUPPLY CURRENT (nA)

0.001

-40 85

VCC = 5V

TEMPERATURE (°C)

VCC = 3.3V

603510-15

SHUTDOWN LEAKAGE CURRENT

10

MAX4789 toc04

1

0.1

0.01

0.001

SHUTDOWN LEAKAGE CURRENT (nA)

0.0001

-40 85

vs. TEMPERATURE

VIN = 5V

TEMPERATURE (°C)

VIN = 3.3V

603510-15

LATCH-OFF LEAKAGE CURRENT

100

10

MAX4789 toc05

1

0.1

0.01

0.001

LATCH-OFF LEAKAGE CURRENT (nA)

0.0001

VIN = 5V

-40 85

vs. TEMPERATURE

MAX4789 toc06

VIN = 3.3V

603510-15

TEMPERATURE (°C)

MAX4789–MAX4794

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

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VIN= 3.3V, TA= +25°C, unless otherwise noted.)

ON

NORMALIZED R

1000

NORMALIZED ON-RESISTANCE

vs. TEMPERATURE

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

-40 85

VCC = 5V

TEMPERATURE (°C)

SWITCH TURN-ON/OFF TIMES

vs. TEMPERATURE

100

ON

OUTPUT CURRENT

vs. OUTPUT VOLTAGE

500

MAX4789 toc07

603510-15

450

400

350

300

250

200

150

OUTPUT CURRENT (mA)

100

50

MAX4793/MAX4794

MAX4789/MAX4790

MAX4791/MAX4792

0

03.3
VIN - V

(V)

OUT

3.02.72.1 2.40.6 0.9 1.2 1.5 1.80.3

FLAG-BLANKING TIMEOUT

vs. TEMPERATURE

50

MAX4789 toc09

45

MAX4789 toc08

MAX4789 toc10

VCC = 5V

OFF

TURN-ON/OFF TIMES (µs)

0.001

10

0.1

0.01

VCC = 3.3V

1

-40 85
TEMPERATURE (°C)

CURRENT-LIMIT RESPONSE

VIN = 3.3V

= 1µF

C

IN

40µs/div

I

LOAD

C

= 10mA

603510-15

MAX4789 toc11

= 1µF

OUT

V

IN

2V/div

V

ON

2V/div

I

OUT

100mA/div

40

35

30

FLAG-BLANKING TIME (ms)

25

20

-40 85
TEMPERATURE (°C)

CURRENT-LIMIT RESPONSE

VIN = V

ON

CIN = 1µF
C

= 1µF

OUT

20µs/div

603510-15

MAX4789 toc12

= V

V

IN

ON

1V/div

I

OUT

100mA/div