Maxim MAX8874TEUK-T, MAX8874SEUK-T, MAX8874REUK-T, MAX8873TEUK-T, MAX8873SEUK-T Datasheet

_______________General Description

The MAX8873T/S/R and MAX8874T/S/R low-dropout lin­ear regulators operate from a +2.5V to +6.5V input
range and deliver up to 120mA. A PMOS pass transis­tor allows the low, 82µA supply current to remain inde­pendent of load, making these devices ideal for
battery-operated portable equipment such as cellular
phones and cordless phones.

The devices feature Dual Mode™ operation: their out­put voltage is preset (at 3.15V for the T versions, 2.84V
for the S versions, or 2.80V for the R versions) or can be
adjusted with an external resistor divider. Total error on
the output is ±3.5%. Output voltages are set on the low
side of popular ranges so that power drain is minimized
for longer battery life. Other features include low-power
shutdown, short-circuit protection, thermal shutdown
protection, and reverse battery protection. The
MAX8874 also includes an auto-discharge function,
which actively discharges the output voltage to ground
when the device is placed in shutdown mode. Both
devices come in a miniature 5-pin SOT23 package.

For dual versions, refer to the MAX8865/MAX8866 data
sheet. For low-noise versions with 30µV

RMS

output

noise, refer to the MAX8877/MAX8878.

________________________Applications

Cordless Telephones Modems
PCS Telephones Hand-Held Instruments
Cellular Telephones Palmtop Computers
PCMCIA Cards Electronic Planners

____________________________Features

♦ LP2980 Pin-Compatible SOT23 Package
♦ Low, 55mV Dropout Voltage at 50mA I

OUT

(130mV at 120mA)

♦ Low, 73µA No-Load Supply Current

Low, 82µA Operating Supply Current (even in
dropout)

♦ Miniature External Components
♦ Thermal Overload Protection
♦ Output Current Limit
♦ Reverse Battery Protection
♦ Dual Mode Operation: Fixed or Adjustable

(1.25V to 6.5V) Output

♦ Low-Power Shutdown

MAX8873T/S/R, MAX8874T/S/R

Low-Dropout, 120mA Linear Regulators

________________________________________________________________

Maxim Integrated Products

1

SOT23-5

TOP VIEW

GND

SET

SHDN

1

5

OUT

IN

MAX8873
MAX8874

2

3

4

__________________Pin Configuration

MAX8873
MAX8874

OUT

GND SET

IN

SHDN

C

OUT

1µF

C

IN

1µF

BATTERY

OUTPUT
VOLTAGE

__________Typical Operating Circuit

19-1257; Rev 1; 3/98

PART

MAX8873TEUK-T

MAX8873SEUK-T

MAX8874TEUK-T

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

5 SOT23-5
5 SOT23-5

5 SOT23-5

______________Ordering Information

SOT TOP

MARK

ABZH

ABZI

ABZJ

MAX8874SEUK-T -40°C to +85°C 5 SOT23-5 ABZK

Dual Mode is a trademark of Maxim Integrated Products.

MAX8873REUK-T -40°C to +85°C 5 SOT23-5 ABZL

MAX8874REUK-T -40°C to +85°C 5 SOT23-5 ABZM

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

MAX8873T/S/R, MAX8874T/S/R

Low-Dropout, 120mA Linear Regulators

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= +3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at 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.

VINto GND ..................................................................-7V to +7V

Output Short-Circuit Duration ............................................Infinite

SET to GND..............................................................-0.3V to +7V

SHDN

to GND..............................................................-7V to +7V

SHDN

to IN .................................................................-7V to 0.3V

OUT to GND ................................................-0.3V to (V

IN

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

SOT23-5 (derate 7.1mW/°C above +70°C).................571mW

Operating Temperature Range ...........................-40°C to +85°C

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

θJA..................................................................................140°C/W

Storage Temperature Range.............................-65°C to +160°C

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

Ω

300

Shutdown Discharge
Resistance (MAX8874)

0.05

0 100

I

SHDN

SHDN Input Bias Current

V

0.4V

IL

SHDN Input Threshold

2.0V

IH

µV

RMS

220

Output Voltage Noise

350

%/mA

0.011 0.030

%/V-0.15 0 0.15∆V

LNR

Line Regulation

mV

55 120

Dropout Voltage (Note 5)

V2.5 6.5V

IN

Input Voltage (Note 2)

1.1

µA

73 150

I

Q

Ground Pin Current

3.05 3.15 3.25

V

OUT

Output Voltage

VV

SET

6.5V

OUT

Adjustable Output Voltage
Range (Note 3)

mA120Maximum Output Current

UNITSMIN TYP MAXSYMBOLPARAMETER

V

SHDN

= V

IN

C

OUT

= 100µF

I

OUT

= 0mA

VIN= 2.5V to 6.5V, SET tied to OUT,
I

OUT

= 1mA

0mA ≤ I

OUT

≤ 50mA,

SET = GND

I

OUT

= 50mA

CONDITIONS

mA280I

LIM

Current Limit (Note 4)

V

MAX887_T

10Hz to 1MHz

I

OUT

= 1mA

SET = GND

C

OUT

= 1µF

MAX887_S 2.75 2.84 2.93

I

OUT

= 50mA 82

0.02

µA

0.0001 1

I

QSHDN

Shutdown Supply Current V

OUT

= 0V

TA= T

MAX

TA= +25°C

TA= T

MAX

TA= +25°C

nA

MAX887_R 2.70 2.80 2.88

I

OUT

= 0mA to 50mA

0.006

∆V

LDR

Load Regulation

SET tied to OUT

SET = GND

SHUTDOWN

MAX8873T/S/R, MAX8874T/S/R

Low-Dropout, 120mA Linear Regulators

_______________________________________________________________________________________

3

__________________________________________Typical Operating Characteristics

(V

IN

= +3.6V, CIN= 1µF, C

OUT

= 1µF, MAX887_T, TA= +25°C, unless otherwise noted.)

UNITSMIN TYP MAXSYMBOLPARAMETER CONDITIONS

ELECTRICAL CHARACTERISTICS (continued)

(VIN= +3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Note 1: Limits are 100% production tested at T

A

= +25°C. Limits over the operating temperature range are guaranteed through cor-

relation using Statistical Quality Control (SQC) methods.

Note 2: Guaranteed by line-regulation test.
Note 3: Adjustable mode only.
Note 4: For design purposes, the current limit should be considered 120mA minimum to 420mA maximum.
Note 5: The dropout voltage is defined as (V

IN

- V

OUT

) when V

OUT

is 100mV below the value of V

OUT

for VIN= V

OUT

+ 2V.

T

SHDN

°CThermal Shutdown Temperature 170

∆T

SHDN

°CThermal Shutdown Hysteresis 20

SET Input Leakage Current
(Note 3)

nA

0.015 2.5

I

SET

V

SET

= 1.3V

SET Reference Voltage (Note 3) V

1.225 1.25 1.275

V

SET

V

IN

= 2.5V to 6.5V,

I

OUT

= 1mA

SET INPUT

THERMAL PROTECTION

TA= +25°C

TA= +25°C
TA= T

MIN

to T

MAX

TA= T

MAX

0.5

1.215 1.25 1.285

3.00

3.05

3.10

3.15

3.20

3.25

3.30

0 20 60 100

120

OUTPUT VOLTAGE

vs. LOAD CURRENT

MAX8873/74-01

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

40 80

100

50

0 20 60

120

100

SUPPLY CURRENT

vs. LOAD CURRENT

60

90

MAX8873/74-02

LOAD CURRENT (mA)

SUPPLY CURRENT (µA)

40

80

80

70

95

55

85

75

65

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0 1 2 4 6 7

OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX8873/74-03

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

3 5

NO LOAD