19-1302; Rev 1; 3/98
Low-Noise, Low-Dropout,
150mA Linear Regulators in SOT23
_______________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
logic-controlled shutdown mode, short-circuit and ther-
mal-shutdown protection, and reverse battery protec-
tion. 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 a miniature 5-pin SOT23 package.
____________________________Features
o
Low Output Noise: 30µV
RMS
o
Low 55mV Dropout at 50mA Output
(165mV at 150mA output)
o
Low 85µA No-Load Supply Current
o
Low 100µA Operating Supply Current
(even in dropout)
o
Thermal-Overload and Short-Circuit Protection
o
Reverse Battery Protection
o
Output Current Limit
o
Preset Output Voltages (±1.4% accuracy)
o
10nA Logic-Controlled Shutdown
MAX8867/MAX8868
________________________Applications
Cellular Telephones
Cordless Telephones
PCS Telephones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
______________Ordering Information
PART**
MAX8867C/Dxy
MAX8867EUKxy-T
MAX8868C/Dxy
MAX8868EUKxy-T
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
5 SOT23-5
Dice*
5 SOT23-5
__________________Pin Configuration
TOP VIEW
SHDN
1
5
BP
*
Dice are tested at T
A
= +25°C.
**xy
is the output voltage code (see Expanded Ordering
Information table).
___Expanded Ordering Information
OUTPUT
VOLTAGE (xy)
CODE
MAX886_EUK25
PRESET
OUTPUT
VOLTAGE
(V)
2.50
2.80
2.84
3.00
3.15
3.30
3.60
5.00
x.y0
SOT TOP MARK
MAX8867
ACAY
ACAZ
ACBA
ACBB
ACBC
ACBD
ACCZ
ACBE
—
MAX8868
ACBF
ACBG
ACBH
ACBI
ACBJ
ACBK
ACDA
ACBL
—
GND
2
MAX8867
MAX8868
4
OUT
IN
3
SOT23-5
MAX886_EUK28
MAX886_EUK29
MAX886_EUK30
MAX886_EUK32
MAX886_EUK33
MAX886_EUK36
MAX886_EUK50
Other xy***
__________Typical Operating Circuit
INPUT
2.5V TO 6.5V
IN
C
IN
1µF
OUT
C
OUT
1µF
OUTPUT
PRESET
2.5V TO 5.0V
150mA
MAX8867
MAX8868
SHDN
C
BP
0.01µF
BP
GND
ON
OFF
***Other
xy between 2.5V and 5.0V are available in 100mV incre-
ments. Contact factory for other versions. Minimum order
quantity is 25,000 units.
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Low-Noise, Low-Dropout,
150mA Linear Regulators in SOT23
MAX8867/MAX8868
ABSOLUTE MAXIMUM RATINGS
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 (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
θ
JB
..................................................................................140°C/W
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage (Note 2)
Output Voltage Accuracy
Maximum Output Current
Current Limit
Ground Pin Current
I
LIM
I
Q
No load
I
OUT
= 150mA
I
OUT
= 1mA
Dropout Voltage (Note 2)
Line Regulation
Load Regulation
Output Voltage Noise
SHUTDOWN
SHDN
Input Threshold
SHDN
Input Bias Current
Shutdown Supply Current
Shutdown Exit Delay
(Note 3)
Shutdown Discharge
Resistance
V
IH
V
IL
I
SHDN
I
Q,
SHDN
V
IN
= 2.5V to 5.5V
V
IN
= 2.5V to 5.5V
V
SHDN
= V
IN
V
OUT
= 0V
C
BP
= 0.1µF,
C
OUT
= 1µF, no load
MAX8868 only
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
300
0.01
0.5
0.01
0.2
30
150
300
1
2.0
0.4
100
V
nA
µA
µs
Ω
∆V
LNR
∆V
LDR
e
n
I
OUT
= 50mA
I
OUT
= 150mA
V
IN
= (V
OUT
+ 0.1V) to 6.5V, I
OUT
= 1mA
I
OUT
= 0mA to 120mA, C
OUT
= 1µF
f = 10Hz to 100kHz,
C
BP
= 0.01µF
C
OUT
= 10µF
C
OUT
= 100µF
-0.15
SYMBOL
V
IN
I
OUT
= 0mA, T
A
= +25°C
I
OUT
= 0mA to 120mA
CONDITIONS
MIN
2.5
-1.4
-3
150
160
390
85
100
1.1
55
165
0
0.01
30
20
0.15
0.04
%/V
%/mA
µV
RMS
120
mV
180
TYP
MAX
6.5
1.4
2
UNITS
V
%
mA
mA
µA
2
_______________________________________________________________________________________
Low-Noise, Low-Dropout,
150mA Linear Regulators in SOT23
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
THERMAL PROTECTION
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
T
SHDN
∆T
SHDN
155
15
°C
°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8867/MAX8868
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 V
IN
= V
OUT
+ 0.5V.
Note 3:
Time needed for V
OUT
to reach 95% of final value.
__________________________________________Typical Operating Characteristics
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 0.01µF, T
A
= +25°C, unless otherwise noted.)
MAX886_EUK25
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8867/8-01
MAX886_EUK50
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8867/8-02
GROUND PIN CURRENT
vs. LOAD CURRENT
105
GROUND PIN CURRENT (µA)
100
95
90
85
80
75
70
65
MAX886_EUK25
MAX886_EUK50
MAX8867/8-03
2.60
5.2
110
OUTPUT VOLTAGE (V)
2.50
OUTPUT VOLTAGE (V)
2.55
5.1
5.0
2.45
4.9
2.40
0
50
100
150
LOAD CURRENT (mA)
4.8
0
50
100
150
LOAD CURRENT (mA)
60
0
50
100
150
LOAD CURRENT (mA)
MAX886_EUK25
GROUND PIN CURRENT vs. INPUT VOLTAGE
MAX8867/8-04
MAX886_EUK50
GROUND PIN CURRENT vs. INPUT VOLTAGE
I
LOAD
= 50mA
100
GROUND PIN CURRENT (µA)
80
NO LOAD
60
40
20
0
MAX8867/8-05
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX8867/8-06
120
I
LOAD
= 50mA
100
GROUND PIN CURRENT (µA)
80
60
40
20
0
0
1
2
3
4
5
NO LOAD
120
6
5
OUTPUT VOLTAGE (V)
4
3
2
1
0
MAX886_EUK50
MAX886_EUK25
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
Low-Noise, Low-Dropout,
150mA Linear Regulators in SOT23
MAX8867/MAX8868
____________________________Typical Operating Characteristics (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 0.01µF, T
A
= +25°C, unless otherwise noted.)
MAX886_EUK25
OUTPUT VOLTAGE vs. TEMPERATURE
MAX8867/8-07
MAX886_EUK50
OUTPUT VOLTAGE vs. TEMPERATURE
MAX8867/8-08
GROUND PIN CURRENT vs. TEMPERATURE
180
GROUND PIN CURRENT (µA)
160
140
120
100
80
60
40
20
MAX886_EUK25
MAX886_EUK50
I
LOAD
= 50mA
MAX8867/8-09
2.60
I
LOAD
= 50mA
OUTPUT VOLTAGE (V)
2.55
5.20
I
LOAD
= 50mA
OUTPUT VOLTAGE (V)
5.10
200
2.50
5.00
2.45
4.90
2.40
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
4.80
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
0
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
MAX886_EUK25
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8867/8-10
MAX886_EUK50
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8867/8-11
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8867/8-12
MAX8867/8-15
250
200
T
A
= +85°C
DROPOUT VOLTAGE (mV)
150
T
A
= +25°C
70
60
C
OUT
= 10µF
50
PSRR (dB)
40
30
20
10
I
LOAD
= 50mA
C
BP
= 0.1µF
C
OUT
= 1µF
DROPOUT VOLTAGE (mV)
200
T
A
= +85°C
150
T
A
= +25°C
T
A
= -40°C
50
100
T
A
= -40°C
50
100
0
0
20
40
60
80
100 120
140
160
LOAD CURRENT (mA)
0
0
20
40
60
80
100 120
140
160
LOAD CURRENT (mA)
0
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
MAX8867/8-13
OUTPUT NOISE vs. BP CAPACITANCE
MAX8867/8-14
OUTPUT NOISE vs. LOAD CURRENT
60
50
OUTPUT NOISE (µV
RMS
)
40
30
20
10
0
MAX886_EUK30
C
OUT
= 10µF
C
BP
= 0.01µF
f = 10Hz TO 100kHz
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
10
C
BP
= 0.01µF
I
LOAD
= 10mA
80
70
OUTPUT NOISE (µV
RMS
)
60
50
MAX886_EUK50
40
30
20
MAX886_EUK25
10
0
MAX886_EUK30
C
OUT
= 10µF
I
LOAD
= 10mA
f = 10Hz TO 100kHz
MAX886_EUK50
1
0.1
C
OUT
= 1µF
C
OUT
= 10µF
MAX886_EUK25
0.01
0.1
1
10
FREQUENCY (kHz)
100
1000
0.001
0.01
BP CAPACITANCE (µF)
0.1
1
10
LOAD CURRENT (mA)
100
4
_______________________________________________________________________________________
Low-Noise, Low-Dropout,
150mA Linear Regulators in SOT23
____________________________Typical Operating Characteristics (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 0.01µF, T
A
= +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX8867/8-20
MAX8867/MAX8868
LOAD-TRANSIENT RESPONSE
MAX8867/8-19
LINE-TRANSIENT RESPONSE
MAX8867/8-18
3.01V
3.00V
2.99V
V
OUT
3.01V
3.00V
2.99V
V
OUT
4V
V
IN
3V
3.001V
V
OUT
50mA
0mA
10µs/div
MAX886_EUK30, V
IN
= V
OUT
+ 0.5V,
C
IN
= 10µF, I
LOAD
= 0mA TO 50mA
I
LOAD
50mA
I
LOAD
0mA
10µs/div
MAX886_EUK30, V
IN
= V
OUT
+ 0.1V,
C
IN
= 10µF, I
LOAD
= 0mA TO 50mA
100µs/div
MAX886_EUK30, I
LOAD
= 50mA
2.999V
MAX8868
ENTERING SHUTDOWN
MAX8867/8-25
MAX886_EUK25
SHUTDOWN EXIT DELAY
MAX8867-21
MAX886_EUK50
SHUTDOWN EXIT DELAY
MAX8867-23
2V
0V
V
SHDN
2V
0V
C
BP
= 0.01µF
V
SHDN
2V
0V
C
BP
= 0.01µF
V
SHDN
2V
V
OUT
1V
0V
500µs/div
NO LOAD
I
LOAD
= 50mA
C
BP
= 0.1µF
V
OUT
4V
C
BP
= 0.1µF
V
OUT
2V
0V
0V
5µs/div
5µs/div
I
LOAD
= 50mA
MAX886_EUK25
10Hz TO 100kHz OUTPUT NOISE
MAX8867/8-16
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
MAX8867/8-17
100
10
C
OUT
ESR (Ω)
C
OUT
= 10µF
1
C
OUT
= 1µF
V
OUT
50µV/div
STABLE REGION
0.1
0.01
1ms/div
C
OUT
= 10µF, C
BP
= 0.1µF, I
LOAD
= 10mA
0
20
40
60
80
100
120
140
LOAD CURRENT (mA)
_______________________________________________________________________________________
5
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