Rainbow Electronics MAX4884 User Manual

General Description

The MAX4881–MAX4884 overvoltage protection (OVP)
controllers with built-in current-limited switch, protect low­voltage systems against voltages of up to 28V. When the
input voltage exceeds the overvoltage trip level of 5.6V
(MAX4881/MAX4883) or 4.5V (MAX4882/MAX4884), the
external n-channel MOSFET is turned off to prevent dam­age to the protected components. An undervoltage/over­voltage flag indicator (OV) notifies the processor that an
undervoltage/overvoltage fault condition is present.

The MAX4881/MAX4882 feature an internal 1.1A cur­rent-limited switch, while the MAX4883B/MAX4883C/
MAX4884B/MAX4884C include an internal 0.7A current­limited switch. When the load current is at the current
limit for longer than the blanking time, the switch of the
MAX4881/MAX4882/MAX4883B/MAX4884B latches off
and does not turn back on until EN, CB, or IN is cycled.
A current-limit flag (FLAGI) asserts to indicate a current
fault condition.

The MAX4883C/MAX4884C limit the current to 0.7A
indefinitely until the thermal protection trips. An overcur­rent flag output asserts to indicate a current fault condi­tion after the blanking time has elapsed.

The MAX4881–MAX4884 have a control input (CB) that
is used to turn on and off the internal current-limited
switch. Other features include a shutdown function (EN)
to disable the external n-channel MOSFET, and a built­in startup delay to allow the adapter voltage to settle
down before turning on the MOSFET.

The MAX4881–MAX4884 is offered in a space-saving
10-pin TDFN package and is specified for operation
over the extended -40°C to +85°C temperature range.

Applications

Features

♦ Overvoltage Protection Up to 28V

♦ Preset Overvoltage Trip Level

5.6V (MAX4881/MAX4883)

4.5V (MAX4882/MAX4884)

♦ Internal Current-Limited Switch

1.1A (MAX4881/MAX4882)

0.7A (MAX4883/MAX4884)

♦ Drives Low-Cost n-Channel MOSFET

♦ Internal 50ms Startup Delay
♦ Overvoltage Fault OV Indicator
♦ Current-Limit Fault FLAGI Indicator

♦ Undervoltage Lockout

♦ Thermal Shutdown Protection

♦ Tiny 10-Pin TDFN Package

MAX4881–MAX4884

Overvoltage Protection Controllers with

Current Limit in TDFN

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

19-3777; Rev 0; 7/05

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.

Cell Phones
Digital Still Cameras

PDAs and Palmtop Devices
MP3 Players

* EP = Exposed pad
**Future product—contact factory for availability.

TOP VIEW

OV

10 8 7

134

IN

3mm x 3mm TDFN

N.C.

9

MAX4881
MAX4882
MAX4883
MAX4884

2

EN

FLAGI

GATE

BTB

BTA

GND

6

5

CB

PART TEMP RANGE PIN-PACKAGE

MAX4881ETB -40°C to +85°C 10 TDFN-EP* 5.6 1.1 LATCH-OFF APK

MAX4882ETB -40°C to +85°C 10 TDFN-EP* 4.5 1.1 LATCH-OFF APL

MAX4883BETB -40°C to +85°C 10 TDFN-EP* 5.6 0.7 LATCH-OFF APM

MAX4883CETB** -40°C to +85°C 10 TDFN-EP* 5.6 0.7 CONTINUOUS APN

MAX4884BETB** -40°C to +85°C 10 TDFN-EP* 4.5 0.7 LATCH-OFF APO

MAX4884CETB** -40°C to +85°C 10 TDFN-EP* 4.5 0.7 CONTINUOUS APP

OV TRIP LEVEL

(V)

CURRENT LIMIT

(A)

CURRENT-LIMIT

MODE

TOP

MARK

MAX4881–MAX4884

Overvoltage Protection Controllers with
Current Limit in TDFN

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= +5V (MAX4881/MAX4883), VIN= +4V (MAX4882/MAX4884), TA= -40°C to +85°C, unless otherwise noted. Typical values are
at T

A

= +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.

(All voltages referenced to GND.)

IN ............................................................................-0.3V to +30V

GATE ......................................................................-0.3V to +12V

EN,

CB, OV, FLAGI, BTA, BTB ................................-0.3V to +6V

Continuous Power Dissipation (T

A

= +70°C)

10-Pin TDFN (derate 18.5mW/°C above +70°C) .....1481.5mW

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

INPUT VOLTAGE (IN)

Input Voltage Range V

Overvoltage Trip Level OVLO VIN rising

Overvoltage-Trip-Level
Hysteresis

Undervoltage Lockout Threshold UVLO VIN falling

Undervoltage Lockout Hysteresis 50 mV

Supply Current IIN + I

INTERNAL SWITCH

BTA Input Range V

BTA Undervoltage Lockout BTA

BTA-Undervoltage-Lockout
Hysteresis

Switch-Forward Current Limit I

Switch-Reverse Current Limit I

- V

Voltage Drop (V

Blanking Time t

BTB Off Current I

GATE

GATE Voltage V

BTA

)I

BTB

IN

No load, VEN = 0 or 5.5V,

BTA

V

IN

BTA

UVLOVBTA

FWD

REV

BLANK

BTB-OFFVEN

GATE

MAX4881/MAX4882, V

MAX4883/MAX4884, V

MAX4881/MAX4882 1.25

MAX4883/MAX4884 0.775

= 400mA

L

I

GATE

sourcing
1µA

= V

OVLO (MIN)

falling 2.4 2.7 V

= 0, VCB = 0 1 µA

1.2 28 V

MAX4881/MAX4883 5.5 5.6 5.7

MAX4882/MAX4884 4.4 4.5 4.6

50 mV

MAX4881/MAX4883 4.2 4.35 4.5

MAX4882/MAX4884 2.4 2.55 2.7

- 0.1V, VCB = V

BTB

BTB

= 5V

V

BTA

(MAX4881/MAX4883)

V

= 4V

BTA

(MAX4882/MAX4884)

VIN = 5V (MAX4881/MAX4883) 9 10

V

= 4.3V

IN

(MAX4882/MAX4884)

IN

2.8 5.7 V

= GND 1 1.1 1.25

= GND 0.6 0.7 0.775

20 50 80 ms

7.6 8.6

240 380 µA

50 mV

110

110

V

V

A

A

mV

V

MAX4881–MAX4884

Overvoltage Protection Controllers with

Current Limit in TDFN

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= +5V (MAX4881/MAX4883), VIN= +4V (MAX4882/MAX4884), TA= -40°C to +85°C, unless otherwise noted. Typical values are
at T

A

= +25°C.) (Note 1)

Note 1: All devices are 100% tested at T

A

= +25°C. Electrical limits over the full temperature range are guaranteed by design.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

INPUT VOLTAGE (IN)

Input Voltage Range V

Overvoltage Trip Level OVLO VIN rising

Overvoltage-Trip-Level
Hysteresis

Undervoltage Lockout Threshold UVLO VIN falling

Undervoltage Lockout Hysteresis 50 mV

Supply Current IIN + I

INTERNAL SWITCH

BTA Input Range V

BTA Undervoltage Lockout BTA

BTA-Undervoltage-Lockout
Hysteresis

Switch-Forward Current Limit I

Switch-Reverse Current Limit I

Voltage Drop (V

Blanking Time t

BTB Off Current I

GATE

GATE Voltage V

BTA

- V

)I

BTB

IN

No load, VEN = 0 or 5.5V,

BTA

V

IN

BTA

UVLOVBTA

FWD

REV

BLANK

BTB-OFFVEN

GATE

MAX4881/MAX4882, V

MAX4883/MAX4884, V

MAX4881/MAX4882 1.25

MAX4883/MAX4884 0.775

= 400mA

L

I

GATE

sourcing
1µA

MAX4881/MAX4883 5.5 5.6 5.7

MAX4882/MAX4884 4.4 4.5 4.6

MAX4881/MAX4883 4.2 4.35 4.5

MAX4882/MAX4884 2.4 2.55 2.7

= V

OVLO (MIN)

falling 2.4 2.7 V

= 0, VCB = 0 1 µA

- 0.1V, VCB = V

BTB

BTB

V

= 5V

BTA

(MAX4881/MAX4883)

V

= 4V

BTA

(MAX4882/MAX4884)

VIN = 5V (MAX4881/MAX4883) 9 10

V

= 4.3V

IN

(MAX4882/MAX4884)

IN

= GND 1 1.1 1.25

= GND 0.6 0.7 0.775

1.2 28 V

50 mV

240 380 µA

2.8 5.7 V

50 mV

110

mV

110

20 50 80 ms

7.6 8.6

V

V

A

A

V

MAX4881–MAX4884

Overvoltage Protection Controllers with
Current Limit in TDFN

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VIN= 5V, TA= +25°C, unless otherwise noted.)

GATE VOLTAGE vs. INPUT VOLTAGE

(MAX4881)

INPUT VOLTAGE (V)

GATE VOLTAGE (V)

MAX4881 toc04

012345678

0

3

6

9

12

OVLO TRIP POINT

UVLO TRIP POINT

BTB OFF CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

BTB OFF CURRENT (nA)

MAX4881 toc05

-40 -15 10 35 60 85

0.01

0.1

1

10

100

1000

VEN = 0
V

CB

= 0

V

BTB

= 5.5V

POWER-UP RESPONSE (MAX4884)

MAX4881 toc06

20ms/div

5V

10V

5V

0

0

5V

0

IN

GATE

BTA

OV

POWER-DOWN RESPONSE (MAX4884)

MAX4881 toc07

20ms/div

5V

0

5V

0

5V

0

IN

10V

GATE

0

BTA

OV

OVERVOLTAGE RESPONSE (MAX4884)

MAX4881 toc09

400ns/div

6V

3V

0

5V

0

IN

GATE

OV

20mA

I

GATE

EN vs. GATE (MAX4884)

MAX4881 toc08

100µs/div

5V

0

10V

0

EN

GATE

IIN + I

BTA

CURRENT vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

I

IN

+ I

BTA

CURRENT (µA)

MAX4881 toc01

0 5 10 15 20 25 30

0

50

100

150

200

250

300

350

400

VEN = 0
V

CB

= 5V

OVLO TRIP POINT

UVLO TRIP POINT

IIN + I

BTA

CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

I

IN

+ I

BTA

CURRENT (µA)

MAX4881 toc02

-40 -15 10 35 60 85

0

50

100

150

200

250

300

350

400

GATE VOLTAGE vs. INPUT VOLTAGE

(MAX4884)

INPUT VOLTAGE (V)

GATE VOLTAGE (V)

MAX4881 toc03

012345678

0

3

6

9

12

UVLO TRIP POINT

OVLO TRIP POINT