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19-1302; Rev 3; 7/02
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 tran-
sistor, 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 thermal-
shutdown 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.
____________________________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**
MAX8867EUKxy-T
MAX8867EZKxy-T
MAX8867C/Dxy
MAX8868EUKxy-T
MAX8868EZKxy-T
MAX8868C/Dxy
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
PIN-PACKAGE
SOT23-5 Regular
SOT23-5 Thin
Dice*
SOT23-5 Regular
SOT23-5 Thin
Dice*
*Dice
are tested at T
A
= +25°C only.
**xy
is the output voltage code (see Expanded Ordering
Information table at end of data sheet).
__________Typical Operating Circuit
INPUT
2.5V TO 6.5V
IN
C
IN
1µF
ON
OFF
C
BP
0.01µF
OUT
C
OUT
1µF
OUTPUT
PRESET
2.5V TO 5.0V
150mA
__________________Pin Configuration
TOP VIEW
SHDN
1
5
BP
MAX8867
MAX8868
SHDN
BP
GND
GND
2
MAX8867
MAX8868
4
OUT
IN
3
SOT23-5
________________________________________________________________
Maxim Integrated Products
1
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.
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 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
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 E_K25
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8867/8-01
MAX886 E_K50
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 E_K25
MAX886 E_K50
MAX8867/8-03
2.60
5.2
110
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
2.55
5.1
2.50
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 E_K25
GROUND PIN CURRENT vs. INPUT VOLTAGE
MAX8867/8-04
MAX886 E_K50
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 E_K50
MAX886 E_K25
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 E_K25
OUTPUT VOLTAGE vs. TEMPERATURE
MAX8867/8-07
MAX886 E_K50
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 E_K25
MAX886 E_K50
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 E
_
K25
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8867/8-10
MAX886 E
_
K50
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 E_K30
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 E_K50
40
30
20
MAX886 E_K25
10
0
MAX886 E_K30
C
OUT
= 10µF
I
LOAD
= 10mA
f = 10Hz TO 100kHz
MAX886 E_K50
1
0.1
C
OUT
= 1µF
C
OUT
= 10µF
MAX886 E_K25
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
_______________________________________________________________________________________
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