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__________________General Description
The MAX8877/MAX8878 low-noise, low-dropout linear
regulators operate from a 2.5V to 6.5V input and deliver
up to 150mA. These devices are pin-compatible with
the industry-standard `2982 and offer an improved
dropout voltage. Typical output noise is 30V
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.
Designed with an internal P-channel MOSFET pass
transistor, the MAX8877/MAX8878 maintain a low
100A 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 MAX8878 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.
________________________Applications
Cellular Telephones
Cordless Telephones
PCS Telephones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
____________________________Features
o
Pin-Compatible with the Industry-Standard `2982
o
Low Output Noise: 30V
RMS
o
Low 55mV Dropout at 50mA Output
(165mV at 150mA output)
o
Low 85A No-Load Supply Current
o
Low 100A 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
MAX8877/MAX8878
Low-Noise, Low-Dropout, 150mA Linear
Regulators with `2982 Pinout
________________________________________________________________
Maxim Integrated Products
1
GND
BP
SHDN
1
5
OUT
IN
MAX8877
MAX8878
SOT23-5
TOP VIEW
2
3
4
_____________________Pin Configuration
MAX8877
MAX8878
INPUT
2.5V TO 6.5V
IN
OUT
SHDN
BP
GND
OUTPUT
PRESET
2.5V TO 5.0V
150mA
C
BP
0.01
F
C
OUT
1
F
C
IN
1
F
OFF
ON
____________Typical Operating Circuit
19-1301; Rev 1; 3/98
PART**
MAX8877
C/Dxy
MAX8877EUKxy-T
MAX8878
C/Dxy
0C to +70C
-40C to +85C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
Dice*
5 SOT23-5
Dice*
_________________Ordering Information
*
Dice are tested at T
A
= +25C only.
**
xy is the output voltage code (see Expanded Ordering
Information table at end of data sheet).
MAX8878EUKxy-T
-40C to +85C
5 SOT23-5
MAX8877/MAX8878
Low-Noise, Low-Dropout, 150mA Linear
Regulators with `2982 Pinout
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (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.
Note 1:
Limits are 100% production tested at T
A
= +25C. 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.
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
= +70C)
SOT23-5 (derate 7.1mW/C above +70C)..................571mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
JB
..................................................................................140C/W
Storage Temperature.........................................-65C to +160C
Lead Temperature (soldering, 10sec) .............................+300C
MAX8878 only
C
BP
= 0.1F
C
OUT
= 1F, no load
I
OUT
= 0mA, T
A
= +25C
V
OUT
= 0V
V
SHDN
= V
IN
V
IN
= 2.5V to 5.5V
I
OUT
= 0mA to 120mA, C
OUT
= 1F
V
IN
= 2.5V to 5.5V
I
OUT
= 150mA
I
OUT
= 50mA
No load
I
OUT
= 150mA
I
OUT
= 1mA
f = 10Hz to 100kHz,
C
BP
= 0.01F
CONDITIONS
300
Resistance Shutdown Discharge
300
s
30
150
Shutdown Exit Delay
(Note 3)
0.2
A
0.01
1
I
Q(SHDN)
Shutdown Supply Current
0.5
nA
0.01
100
I
SHDN
SHDN Input Bias Current
0.4
V
IL
V
2.0
V
IH
SHDN Input Threshold
20
V
RMS
30
e
n
Output Voltage Noise
mA
150
Maximum Output Current
-1.4
1.4
V
2.5
6.5
V
IN
Input Voltage
%/mA
0.01
0.04
V
LDR
Load Regulation
165
55
120
mA
160
390
I
LIM
Current Limit
A
85
180
I
Q
Ground Pin Current
100
mV
1.1
Dropout Voltage (Note 2)
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
T
A
= -40C to +85C
T
A
= +25C
T
A
= +85C
T
A
= +25C
T
A
= +85C
T
A
= +25C
C
OUT
= 100F
C
OUT
= 10F
C
155
T
SHDN
Thermal Shutdown Temperature
C
15
T
SHDN
Thermal Shutdown Hysteresis
I
OUT
= 0mA to 120mA, T
A
= -40C to +85C
%
-3
2
Output Voltage Accuracy
V
IN
= (V
OUT
+ 0.1V) to 6.5V, I
OUT
= 1mA
%/V
-0.15
0
0.15
V
LNR
Line Regulation
SHUTDOWN
THERMAL PROTECTION
MAX8877/MAX8878
Low-Noise, Low-Dropout, 150mA Linear
Regulators with `2982 Pinout
_______________________________________________________________________________________
3
2.40
2.45
2.50
2.55
2.60
0
50
100
150
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK25)
MAX8877-01
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
4.8
4.9
5.0
5.1
5.2
0
50
100
150
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK50)
MAX8877-02
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
60
65
70
75
80
85
90
95
100
105
110
0
50
100
150
GROUND PIN CURRENT
vs. LOAD CURRENT
MAX8877-03
LOAD CURRENT (mA)
GROUND PIN CURRENT (
A)
MAX887_EUK50
MAX887_EUK25
0
40
20
80
60
100
120
0
2
3
1
4
5
6
GROUND PIN CURRENT vs. INPUT VOLTAGE
(MAX887_EUK25)
MAX8877-04
INPUT VOLTAGE (V)
GROUND PIN CURRENT (
A)
NO LOAD
I
LOAD
= 50mA
2.40
2.45
2.50
2.55
2.60
-40
40
20
0
-20
60
80
100
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX887_EUK25)
MAX8877-07
TEMPERATURE (C)
OUTPUT VOLTAGE (V)
I
LOAD
= 50mA
0
40
20
80
60
100
120
0
2
3
1
4
5
6
GROUND PIN CURRENT vs. INPUT VOLTAGE
(MAX887_EUK50)
MAX8877-05
INPUT VOLTAGE (V)
GROUND PIN CURRENT (
A)
NO LOAD
I
LOAD
= 50mA
0
2
1
4
3
5
6
0
2
3
1
4
5
6
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX8877-06
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
MAX887_EUK25
NO LOAD
MAX887_EUK50
4.8
4.9
5.0
5.1
5.2
-40
40
20
0
-20
60
80
100
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX887_EUK50)
MAX8877-08
TEMPERATURE (C)
OUTPUT VOLTAGE (V)
I
LOAD
= 50mA
0
60
40
20
100
80
180
160
140
120
200
-40
-20
0
20
40
60
80
100
GROUND PIN CURRENT
vs. TEMPERATURE
MAX8877-09
TEMPERATURE (C)
GROUND PIN CURRENT (
A)
MAX887_EUK50
MAX887_EUK25
I
LOAD
= 50mA
__________________________________________Typical Operating Characteristics
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, C
IN
= 1F, C
OUT
= 1F, C
BP
= 0.01F, T
A
= +25C, unless otherwise noted.)
MAX8877/MAX8878
Low-Noise, Low-Dropout, 150mA Linear
Regulators with `2982 Pinout
4
_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, C
IN
= 1F, C
OUT
= 1F, C
BP
= 0.01F, T
A
= +25C, unless otherwise noted.)
0
50
150
100
200
250
0
40
60
20
80
100 120 140 160
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK25)
MAX8877-10
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
T
A
= +85C
T
A
= +25C
T
A
= -40C
0
50
100
150
200
0
40
60
20
80
100 120 140 160
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK50)
MAX8877-11
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
T
A
= +85C
T
A
= +25C
T
A
= -40C
70
0
10
20
30
40
50
60
0.01
0.1
1
10
100
1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8877-12
FREQUENCY (kHz)
PSRR (dB)
I
LOAD
= 50mA
C
BP
= 0.1
F
C
OUT
= 10
F
C
OUT
= 1
F
10
0.01
0
10
1
1000
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
0.1
1
MAX8877-13
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY (
V/
Hz)
100
C
BP
= 0.01
F
I
LOAD
= 10mA
C
OUT
= 10
F
C
OUT
= 1
F
1ms/div
MAX887_EUK25, C
OUT
= 10
F, I
LOAD
= 10mA, C
BP
= 0.1
F
OUTPUT NOISE 10Hz TO 100kHz
V
OUT
50
V/div
MAX8877-16
80
0
10
20
30
40
50
60
70
0.001
0.01
0.1
OUTPUT NOISE vs. BP CAPACITANCE
MAX8877-14
BP CAPACITANCE (
F)
OUTPUT NOISE (
V
RMS
)
MAX887_EUK50
C
OUT
= 10
F
I
LOAD
= 10mA
f = 10Hz to 100kHz
MAX887_EUK30
MAX887_EUK25
0
20
10
40
30
50
60
1
10
100
1000
OUTPUT NOISE vs. LOAD CURRENT
MAX8877-15
LOAD CURRENT (mA)
OUTPUT NOISE (
V
RMS
)
MAX887_EUK50
C
OUT
= 10
F
C
BP
= 0.01
F
f = 10Hz to 100kHz
MAX887_EUK30
MAX887_EUK25
100
0.01
0
100
150
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
0.1
MAX8877-17
LOAD CURRENT (mA)
C
OUT
ESR (
)
1
10
C
OUT
= 10
F
C
OUT
= 1
F
STABLE REGION
MAX8877/MAX8878
Low-Noise, Low-Dropout, 150mA Linear
Regulators with `2982 Pinout
_______________________________________________________________________________________
5
3.00V
2.99V
3.01V
V
OUT
I
LOAD
50mA
10
s/div
LOAD-TRANSIENT RESPONSE
MAX8877-19
MAX887_EUK30, V
IN
= V
OUT
+ 0.5V,
C
IN
= 10
F, I
LOAD
= 0mA TO 50mA
3.00V
2.99V
3.01V
V
OUT
I
LOAD
50mA
10
s/div
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX8877-20
MAX887_EUK30, V
IN
= V
OUT
+ 0.1V,
C
IN
= 10
F, I
LOAD
= 0mA TO 50mA
1V
0V
0V
2V
2V
5
s/div
MAX887_EUK25
SHUTDOWN EXIT DELAY
MAX8877-21
MAX887_EUK25, I
LOAD
= 50mA
V
SHDN
V
OUT
C
BP
= 0.01
F
C
BP
= 0.1
F
0V
0V
4V
2V
2V
5
s/div
MAX887_EUK50
SHUTDOWN EXIT DELAY
MAX8877-22
MAX887_EUK50, I
LOAD
= 50mA
V
SHDN
V
OUT
C
BP
= 0.01
F
C
BP
= 0.1
F
0V
0V
5V
2V
V
SHDN
V
OUT
500
s/div
ENTERING SHUTDOWN
MAX8877-23
MAX8878, NO LOAD
____________________________Typical Operating Characteristics (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V, C
IN
= 1F, C
OUT
= 1F, C
BP
= 0.01F, T
A
= +25C, unless otherwise noted.)
3.000V
2.999V
3.001V
3V
4V
V
IN
V
OUT
100
s/div
LINE-TRANSIENT RESPONSE
MAX8877-18
MAX887_EUK30, I
LOAD
= 50mA
______________________________________________________________Pin Description
NAME
FUNCTION
1
IN
Regulator Input. Supply voltage can range from 2.5V to 6.5V. Bypass with a 1F capacitor to GND (see
Capacitor Selection and Regulator Stability section).
2
GND
Ground. This pin also functions as a heatsink. Solder to a large pad or the circuit-board ground plane to
maximize power dissipation.
PIN
3
SHDN
Active-Low Shutdown Input. A logic low reduces the supply current to 10nA. On the MAX8878, a logic low
also causes the output voltage to discharge to GND. Connect to IN for normal operation.
4
BP
Reference-Noise Bypass. Bypass with a low-leakage, 0.01F ceramic capacitor for reduced noise at the
output.
5
OUT
Regulator Output. Sources up to 150mA. Bypass with a 1F (<0.2
typical ESR) capacitor to GND.
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