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19-0466; Rev 2; 11/98
Low-Dropout, 120mA Linear Regulators
_______________General Description
The MAX8863T/S/R and MAX8864T/S/R low-dropout lin-
ear regulators operate from a +2.5V to +6.5V input
range and deliver up to 120mA. A PMOS pass transis-
tor allows the low, 80µA supply current to remain inde-
pendent of load, making these devices ideal for
battery-operated portable equipment such as cellular
phones, cordless phones, and modems.
The devices feature Dual Mode™ operation: their out-
put 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. Other fea-
tures include low-power shutdown, short-circuit protec-
tion, thermal shutdown protection, and reverse battery
protection. The MAX8864 also includes an auto-dis-
charge function, which actively discharges the output
voltage to ground when the device is placed in shut-
down mode. Both devices come in a miniature 5-pin
SOT23-5 package.
________________________Applications
Cordless Telephones
Modems
PCS Telephones
Hand-Held Instruments
Cellular Telephones
Palmtop Computers
PCMCIA Cards
Electronic Planners
__________Typical Operating Circuit
____________________________Features
o Low Cost
o Low, 55mV Dropout Voltage @ 50mA IOUT
o Low, 68µA No-Load Supply Current
Low, 80µA Operating Supply Current (even in
dropout)
o Low, 350µVRMS Output Noise
o Miniature External Components
o Thermal Overload Protection
o Output Current Limit
o Reverse Battery Protection
o Dual Mode™ Operation: Fixed or Adjustable
(1.25V to 6.5V) Output
o Low-Power Shutdown
______________Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
SOT TOP
MARK*
MAX8863TEUK-T -40°C to +85°C 5 SOT23-5 AABE
MAX8863SEUK-T -40°C to +85°C 5 SOT23-5 AABF
MAX8863REUK-T -40°C to +85°C 5 SOT23-5 AABV
MAX8864TEUK-T -40°C to +85°C 5 SOT23-5 AABG
MAX8864SEUK-T -40°C to +85°C 5 SOT23-5 AABH
MAX8864REUK-T -40°C to +85°C 5 SOT23-5 AABW
*Alternate marking information: CY_ _ = MAX8863T,
CZ_ _ = MAX8863S, DA_ _ = MAX8864T, DB_ _ = MAX8864S
__________________Pin Configuration
BATTERY
CIN
1µF
IN OUT
MAX8863
MAX8864
SHDN
GND SET
OUTPUT
VOLTAGE
COUT
1µF
TOP VIEW
SHDN 1
5 SET
MAX8863
GND 2 MAX8864
IN 3
OUT
4
SOT23-5
Dual Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.

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Low-Dropout, 120mA Linear Regulators
ABSOLUTE MAXIMUM RATINGS
VIN to 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 (VIN + 0.3V)
Continuous Power Dissipation (TA = +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/Watt
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
(VIN = +3.6V, GND = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Input Voltage (Note 2)
Output Voltage
Adjustable Output Voltage
Range (Note 3)
Maximum Output Current
Current Limit (Note 4)
Ground Pin Current
Dropout Voltage (Note 5)
Line Regulation
Load Regulation
Output Voltage Noise
SHUTDOWN
SHDN Input Threshold
SHDN Input Bias Current
Shutdown Supply Current
Shutdown Discharge
Resistance (MAX8864)
SYMBOL
VIN
VOUT
CONDITIONS
0mA IOUT 50mA,
SET = GND
MAX886_T
MAX886_S
MAX886_R
MIN
2.5
3.05
2.75
2.70
VOUT
VSET
ILIM
IQ
VLNR
VLDR
120
SET = GND
IOUT = 1mA
IOUT = 50mA
ILOAD = 0mA
ILOAD = 50mA
VIN = 2.5V to 6.5V, SET tied to OUT,
IOUT = 1mA
IOUT = 0mA to 50mA
SET = GND
SET tied to OUT
10Hz to 1MHz
COUT = 1µF
COUT = 100µF
-0.15
TYP
3.15
2.84
2.80
280
68
80
1.1
55
0
0.011
0.006
350
220
MAX
6.5
3.25
2.93
2.88
UNITS
V
V
6.5 V
mA
mA
150
µA
mV
120
0.15 %/V
0.040
%/mA
µVRMS
VIH
VIL
ISHDN
VSHDN = VIN
IQSHDN VOUT = 0V
TA = +25°C
TA = TMAX
TA = +25°C
TA = TMAX
2.0
0.4
0 100
0.05
0.0001 1
0.02
300
V
nA
µA
2 _______________________________________________________________________________________

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Low-Dropout, 120mA Linear Regulators
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3.6V, GND = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SET INPUT
SYMBOL
SET Reference Voltage (Note 3) VSET
SET Input Leakage Current
(Note 3)
ISET
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TSHDN
TSHDN
CONDITIONS
VIN = 2.5V to 6.5V,
IOUT = 1mA
VSET = 1.3V
TA = +25°C
TA = TMIN to TMAX
TA = +25°C
TA = TMAX
MIN TYP MAX UNITS
1.225
1.215
1.25
1.25
0.015
0.5
1.275
1.285
2.5
V
nA
170 ˚C
20 ˚C
Note 1: Limits are 100% production tested at TA = +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: Not tested. For design purposes, the current limit should be considered 120mA minimum to 420mA maximum.
Note 5: The dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT for VIN = VOUT +2V.
__________________________________________Typical Operating Characteristics
(VIN = +3.6V, CIN = 1µF, COUT = 1µF, TA = +25°C, MAX886_T, unless otherwise noted.)
OUTPUT VOLTAGE
vs. LOAD CURRENT
3.30
3.25
3.20
3.15
3.10
3.05
3.00
0 10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
SUPPLY CURRENT
vs. LOAD CURRENT
100
95
90
85
80
75
70
65
60
55
50
0 10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
NO LOAD
12 345
INPUT VOLTAGE (V)
6
_______________________________________________________________________________________ 3

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Low-Dropout, 120mA Linear Regulators
____________________________Typical Operating Characteristics (continued)
(VIN = +3.6V, CIN = 1µF, COUT = 1µF, MAX886_T, TA = +25°C, unless otherwise noted.)
90
80
70
60
50
40
30
20
10
0
0
SUPPLY CURRENT
vs. INPUT VOLTAGE
ILOAD = 50mA
ILOAD = 0mA
12 345
INPUT VOLTAGE (V)
6
OUTPUT VOLTAGE
vs. TEMPERATURE
3.30
ILOAD = 50mA
3.25
3.20
3.15
3.10
3.05
3.00
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
SUPPLY CURRENT
vs. TEMPERATURE
100
90 ILOAD = 50mA
80
70
60
50
40
30
20
10
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
DROPOUT VOLTAGE
vs. LOAD CURRENT
140
TA = +85°C
120
100
TA = +25°C
80
60
TA = -40°C
40
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
70
VOUT = 3.15V
60 RL = 100
50
COUT = 10µF
40
30
20 COUT = 1µF
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
10
RL = 50
COUT = 1µF
1
COUT = 100µF
0.10
20
0
0 10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
10
0
0.01
0.1 1 10 100
FREQUENCY (kHz)
1000
0.01
0.1
1 10 100
FREQUENCY (kHz)
1000
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
1000
COUT = 1µF
OUTPUT NOISE DC TO 1MHz
100
INTERNAL FEEDBACK
10
1 EXTERNAL FEEDBACK
VOUT
STABLE REGION
0.1
0.01
0 10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
1ms/div
ILOAD = 50mA, VOUT IS AC COUPLED
4 _______________________________________________________________________________________

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Low-Dropout, 120mA Linear Regulators
____________________________Typical Operating Characteristics (continued)
(VIN = +3.6V, CIN = 1µF, COUT = 1µF, MAX886_T, TA = +25°C, unless otherwise noted.)
LINE TRANSIENT
LOAD TRANSIENT
3.16V
VOUT 3.15V
3.14V
3.16V
VOUT 3.15V
3.14V
4.6V
VIN
3.6V
50µs/div
ILOAD = 50mA, VOUT IS AC COUPLED
3.16V
VOUT 3.15V
3.14V
LOAD TRANSIENT
ILOAD
10µs/div
ILOAD = 0mA to 50mA, CIN = 10µF, VOUT IS AC COUPLED
3.16V
VOUT 3.15V
3.14V
LOAD TRANSIENT
ILOAD
10µs/div
VIN = VOUT + 0.2V, ILOAD = 0mA to 50mA, CIN = 10µF,
VOUT IS AC COUPLED
MAX8864 SHUTDOWN (NO LOAD)
4V
VOUT 2V
0V
50mA
ILOAD
0mA
10µs/div
VIN = VOUT + 0.1V, ILOAD = 0mA to 50mA, CIN = 10µF,
VOUT IS AC COUPLED
MAX8864 SHUTDOWN
4V
VOUT 2V
0V
2V
VSHDN
0V
VSHDN
2V
0V
NO LOAD
500µs/div
ILOAD = 50mA
200µs/div
_______________________________________________________________________________________ 5