MAXIM MAX8867, MAX8868 User Manual

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
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_______________General Description

The MAX8867/MAX8868 low-noise, low-dropout linear
regulators operate from a 2.5V to 6.5V input and deliver
up to 150mA. Typical output noise for these devices is
just 30µV

RMS

, and typical dropout is only 165mV at
150mA. The output voltage is preset to voltages in the
range of 2.5V to 5.0V, in 100mV increments. The
MAX8867 and MAX8868 are pin-compatible with the
MAX8863 and MAX8864, except for the BP pin.

Designed with an internal P-channel MOSFET pass tran­sistor, the MAX8867/MAX8868 maintain a low 100µA
supply current, independent of the load current and
dropout voltage. Other features include a 10nA logic­controlled shutdown mode, short-circuit and thermal­shutdown protection, and reverse battery protection.
The MAX8868 also includes an auto-discharge function,
which actively discharges the output voltage to ground
when the device is placed in shutdown. Both devices
come in regular and thin 5-pin SOT23 packages.

________________________Applications

Cellular Telephones Modems

Cordless Telephones Hand-Held Instruments

PCS Telephones Palmtop Computers

PCMCIA Cards Electronic Planners

____________________________Features

♦ Low Output Noise: 30µV

RMS

♦ Low 55mV Dropout at 50mA Output

(165mV at 150mA output)

♦ Low 85µA No-Load Supply Current

♦ Low 100µA Operating Supply Current

(Even In Dropout)

♦ Thermal-Overload and Short-Circuit Protection

♦ Reverse Battery Protection

♦ Output Current Limit

♦ Preset Output Voltages (±1.4% Accuracy)

♦ 10nA Logic-Controlled Shutdown

MAX8867/MAX8868

Low-Noise, Low-Dropout,

150mA Linear Regulators in SOT23

________________________________________________________________ Maxim Integrated Products 1

__________________Pin Configuration

19-1302; Rev 3; 7/02

__________Typical Operating Circuit

_________________Ordering Information

*Dice are tested at TA= +25°C only.
**xy is the output voltage code (see Expanded Ordering

Information table at end of data sheet).

PART**

MAX8867EUKxy-T -40°C to +85°C SOT23-5 Regular

MAX8867EZKxy-T -40°C to +85°C SOT23-5 Thin
MAX8867C/Dxy 0°C to +70°C Dice*
MAX8868EUKxy-T -40°C to +85°C SOT23-5 Regular
MAX8868EZKxy-T -40°C to +85°C SOT23-5 Thin
MAX8868C/Dxy 0°C to +70°C Dice*

TEMP

RANGE

PIN-PACKAGE

ON

INPUT

2.5V TO 6.5V

C

IN

1µF

OFF

IN OUT

C

OUT

MAX8867
MAX8868

SHDN

BP

C

BP

0.01µF

GND

1µF

OUTPUT
PRESET

2.5V TO 5.0V
150mA

TOP VIEW

15BPSHDN

MAX8867

2

GND

MAX8868

34

SOT23-5

OUTIN

MAX8867/MAX8868

Low-Noise, Low-Dropout,
150mA Linear Regulators in SOT23

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= V

OUT(NOMINAL)

+ 0.5V, TA= -40°C to +85°C, 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.

C

OUT

= 10µF

C

OUT

= 100µF

VIN= 2.5V to 5.5V

I

OUT

= 0mA, TA= +25°C

2.0

f = 10Hz to 100kHz,
C

BP

= 0.01µF

TA= +25°C 0.01 1

TA= +85°C

I

OUT

= 0mA to 120mA, C

OUT

= 1µF

No load

I

OUT

= 150mA

V

OUT

= 0V

I

OUT

= 150mA

VIN= 2.5V to 5.5V

CONDITIONS

TA= +25°C

µA

V

0.01 100

V

IH

0.4

SHDN Input Threshold

I

Q, SHDN

0.2

Shutdown Supply Current

TA= +25°C

TA= +85°C

V

SHDN

= V

IN

nAI

SHDN

0.5

SHDN Input Bias Current

V

IL

300MAX8868 only

Shutdown Discharge
Resistance

Ω

mA150Maximum Output Current

-1.4 1.4

V2.5 6.5V

IN

Input Voltage (Note 2)

µV

RMS

20

e

n

30

Output Voltage Noise

%/mA0.01 0.04∆V

LDR

Load Regulation

mA160 390I

LIM

Current Limit

I

OUT

= 1mA

85 180

I

OUT

= 50mA

Ground-Pin Current µA

100

I

Q

1.1

165

UNITSMIN TYP MAXSYMBOLPARAMETER

Dropout Voltage (Note 2) mV

55 120

30 150

TA= -40°C to +85°C

CBP= 0.1µF,
C

OUT

= 1µF, no load

µs

300

Shutdown Exit Delay
(Note 3)

VIN= (V

OUT

+ 0.1V) to 6.5V, I

OUT

= 1mA %/V-0.15 0 0.15∆V

LNR

Line Regulation

I

OUT

= 0mA to 120mA

%

-3 2

Output Voltage Accuracy

SHUTDOWN

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

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

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

SHDN to IN ...............................................................-7V to +0.3V

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

IN

+ 0.3V)

Continuous Power Dissipation (TA= +70°C)

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

SOT23-5 Thin (derate 9.1mW/°C above +70°C)..........727mW

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

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

θ

JB

(Regular)..................................................................140°C/W

θ

JB

(Thin)........................................................................110°C/W

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

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

MAX8867/MAX8868

Low-Noise, Low-Dropout,

150mA Linear Regulators in SOT23

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= V

OUT(NOMINAL)

+ 0.5V, TA= -40°C to +85°C, 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

correlation using Statistical Quality Control (SQC) Methods.

Note 2: 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

+ 0.5V.

Note 3: Time needed for V

OUT

to reach 95% of final value.

CONDITIONS

°C155T

SHDN

Thermal-Shutdown
Temperature

UNITSMIN TYP MAXSYMBOLPARAMETER

°C15∆T

SHDN

Thermal-Shutdown
Hysteresis

__________________________________________Typical Operating Characteristics

(VIN= V

OUT(NOMINAL)

+ 0.5V, CIN= 1µF, C

OUT

= 1µF, CBP= 0.01µF, TA= +25°C, unless otherwise noted.)

2.40

2.45

2.50

2.55

2.60

0 50 100 150

MAX886 E_K25

OUTPUT VOLTAGE vs. LOAD CURRENT

MAX8867/8-01

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

4.8

4.9

5.0

5.1

5.2

0 50 100 150

MAX886 E_K50

OUTPUT VOLTAGE vs. LOAD CURRENT

MAX8867/8-02

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

60

70

65

85

80

75

100

95

90

110

105

0 50 100 150

GROUND PIN CURRENT

vs. LOAD CURRENT

MAX8867/8-03

LOAD CURRENT (mA)

GROUND PIN CURRENT (µA)

MAX886 E_K50

MAX886 E_K25

THERMAL PROTECTION

0

20

60

40

80

100

120

0213546

MAX886 E_K25

GROUND PIN CURRENT vs. INPUT VOLTAGE

MAX8867/8-04

INPUT VOLTAGE (V)

GROUND PIN CURRENT (µA)

I

LOAD

= 50mA

NO LOAD

0

20

60

40

80

100

120

0213546

MAX886 E_K50

GROUND PIN CURRENT vs. INPUT VOLTAGE

MAX8867/8-05

INPUT VOLTAGE (V)

GROUND PIN CURRENT (µA)

I

LOAD

= 50mA

NO LOAD

0

1

3

2

4

5

6

0213546

OUTPUT VOLTAGE vs. INPUT VOLTAGE

MAX8867/8-06

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

MAX886 E_K50

MAX886 E_K25

10

0.01

0.1 1 10 100 1000

OUTPUT NOISE SPECTRAL DENSITY

vs. FREQUENCY

MAX8867/8-13

FREQUENCY (kHz)

OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)

0.1

1

C

OUT

= 1µF

C

BP

= 0.01µF

I

LOAD

= 10mA

C

OUT

= 10µF

80

0

0.001 0.01 0.1

OUTPUT NOISE vs. BP CAPACITANCE

20

10

MAX8867/8-14

BP CAPACITANCE (µF)

OUTPUT NOISE (µV

RMS

)

30

50

60

40

70

MAX886 E_K50

C

OUT

= 10µF

I

LOAD

= 10mA

f = 10Hz TO 100kHz

MAX886 E_K30

MAX886 E_K25

60

0

1 10 100

OUTPUT NOISE vs. LOAD CURRENT

20

10

40

30

50

MAX8867/8-15

LOAD CURRENT (mA)

OUTPUT NOISE (µV

RMS

)

MAX886 E_K50

C

OUT

= 10µF

C

BP

= 0.01µF

f = 10Hz TO 100kHz

MAX886 E_K30

MAX886 E_K25

MAX8867/MAX8868

Low-Noise, Low-Dropout,
150mA Linear Regulators in SOT23

4 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(VIN= V

OUT(NOMINAL)

+ 0.5V, CIN= 1µF, C

OUT

= 1µF, CBP= 0.01µF, TA= +25°C, unless otherwise noted.)

2.40

2.50

2.45

2.55

2.60

-40 0-20 20 8040 60 100

MAX886 E_K25

OUTPUT VOLTAGE vs. TEMPERATURE

MAX8867/8-07

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

I

LOAD

= 50mA

0

100

50

200

150

250

04020 60 80 140100 120 160

MAX886 E_K25

DROPOUT VOLTAGE vs. LOAD CURRENT

MAX8867/8-10

LOAD CURRENT (mA)

DROPOUT VOLTAGE (mV)

TA = +85°C

TA = -40°C

TA = +25°C

4.80

5.00

4.90

5.10

5.20

-40 0-20 20 8040 60 100

MAX886 E_K50

OUTPUT VOLTAGE vs. TEMPERATURE

MAX8867/8-08

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

I

LOAD

= 50mA

0

100

80

40

20

60

160

140

120

200

180

-40 0-20 20 8040 60 100

GROUND PIN CURRENT vs. TEMPERATURE

MAX8867/8-09

TEMPERATURE (°C)

GROUND PIN CURRENT (µA)

MAX886 E_K50

I

LOAD

= 50mA

MAX886 E_K25

0

100

50

150

200

04020 60 80 140100 120 160

MAX886 E_K50

DROPOUT VOLTAGE vs. LOAD CURRENT

MAX8867/8-11

LOAD CURRENT (mA)

DROPOUT VOLTAGE (mV)

TA = +85°C

TA = -40°C

TA = +25°C

70

0

0.01 0.1 1 10010 1000

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

10

20

MAX8867/8-12

FREQUENCY (kHz)

PSRR (dB)

30

50

40

60

C

OUT

= 1µF

I

LOAD

= 50mA

C

BP

= 0.1µF

C

OUT

= 10µF