19-1301; Rev 2; 1/01
Low-Noise, Low-Dropout, 150mA Linear
Regulators with '2982 Pinout
__________________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 30µV
RMS
, and
typical dropout is only 165mV at 150mA. The output
voltage is preset to voltages in the range of 1.5V to
5.0V, in 100mV increments.
Designed with an internal P-channel MOSFET pass
transistor, the MAX8877/MAX8878 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 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 regular and thin 5-pin SOT23 pack-
ages.
____________________________Features
o
Pin-Compatible with the Industry-Standard '2982
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
MAX8877/MAX8878
________________________Applications
Cellular Telephones
Cordless Telephones
PCS Telephones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
_________________Ordering Information
PART**
MAX8877C/Dxy
MAX8877EUKxy-T
MAX8877EZKxy-T
MAX8878C/Dxy
MAX8878EUKxy-T
TEMP.
RANGE
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
5 SOT23-5 Regular
5 SOT23-5 Thin
Dice*
5 SOT23-5 Regular
MAX8878EZKxy-T
-40°C to +85°C 5 SOT23-5 Thin
*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
3.3µF
OUTPUT
PRESET
1.5V TO 5.0V
150mA
_____________________Pin Configuration
TOP VIEW
IN
1
5
OUT
MAX8877
MAX8878
SHDN
BP
GND
GND
2
MAX8877
MAX8878
4
BP
SHDN
3
SOT23-5
REGULAR AND THIN
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Low-Noise, Low-Dropout, 150mA Linear
Regulators with '2982 Pinout
MAX8877/MAX8878
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 or 2.5V (whichever is greater), T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
PARAMETER
Input Voltage
SYMBOL
V
IN
I
OUT
= 0.1mA, T
A
= +25°C, V
OUT
≥
2.5V
I
OUT
= 0.1mA to 120mA, T
A
= -40°C to +85°C,
V
OUT
≥
2.5V
I
OUT
= 0.1mA, T
A
= +25°C, V
OUT
< 2.5V
I
OUT
= 0.1mA to 120mA, T
A
= -40°C to +85°C,
V
OUT
< 2.5V
Maximum Output Current
Current Limit
Ground Pin Current
I
LIM
I
Q
No load
I
OUT
= 150mA
I
OUT
= 1mA
Dropout Voltage (Note 2)
I
OUT
= 50mA
I
OUT
= 150mA
Line Regulation
Load Regulation
Output Voltage Noise
SHUTDOWN
SHDN
Input Threshold
SHDN
Input Bias Current
Shutdown Supply Current
Shutdown Exit Delay
(Note 3)
Resistance Shutdown Discharge
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
MAX8878 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
µA
µA
µs
Ω
V
∆V
LNR
∆V
LDR
e
n
V
IN
= 2.5V or (V
OUT
+ 0.1V) to 6.5V,
I
OUT
= 1mA
I
OUT
= 0.1mA to 120mA, C
OUT
= 1µF
f = 10Hz to 100kHz,
C
BP
= 0.01µF
C
OUT
= 10µF
C
OUT
= 100µF
-0.15
CONDITIONS
MIN
2.5
-1.4
-3
-3
-3.5
150
160
390
85
100
1.1
55
165
0
0.01
30
20
0.15
0.04
%/V
%/mA
µVRMS
120
mV
180
TYP
MAX
6.5
1.4
2
3
3.5
mA
mA
µA
%
UNITS
V
Output Voltage Accuracy
2
_______________________________________________________________________________________
Low-Noise, Low-Dropout, 150mA Linear
Regulators with '2982 Pinout
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V or 2.5V (whichever is greater), 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
MAX8877/MAX8878
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. (Only
applicable for V
OUT
= +2.5V to +5V.)
Note 3:
Time needed for V
OUT
to reach 95% of final value.
__________________________________________Typical Operating Characteristics
(V
IN
= V
OUT(NOMINAL)
+ 0.5V or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 0.01µF, T
A
= +25°C, unless otherwise
noted.)
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK25)
MAX8877-01
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK50)
MAX8877-02
GROUND PIN CURRENT
vs. LOAD CURRENT
105
GROUND PIN CURRENT (µA)
100
95
90
85
80
75
70
65
MAX887_EUK25
MAX887_EUK50
MAX8877-03
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)
GROUND PIN CURRENT vs. INPUT VOLTAGE
(MAX887_EUK25)
MAX8877-04
GROUND PIN CURRENT vs. INPUT VOLTAGE
(MAX887_EUK50)
MAX8877-05
OUTPUT VOLTAGE vs. INPUT VOLTAGE
NO LOAD
5
OUTPUT VOLTAGE (V)
MAX887_EUK50
4
3
2
1
0
MAX887_EUK25
MAX8877-06
120
I
LOAD
= 50mA
GROUND PIN CURRENT (µA)
100
80
NO LOAD
60
40
20
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
120
100
80
I
LOAD
= 50mA
6
GROUND PIN CURRENT (µA)
NO LOAD
60
40
20
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
Low-Noise, Low-Dropout, 150mA Linear
Regulators with '2982 Pinout
MAX8877/MAX8878
Typical Operating Characteristics (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 0.01µF, T
A
= +25°C, unless otherwise
noted.)
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX887_EUK25)
MAX8877-07
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX887_EUK50)
MAX8877-08
GROUND PIN CURRENT
vs. TEMPERATURE
180
GROUND PIN CURRENT (µA)
160
140
120
100
80
60
40
20
MAX887_EUK25
MAX887_EUK50
I
LOAD
= 50mA
MAX8877-09
MAX8877-15
MAX8877-12
2.60
I
LOAD
= 50mA
2.55
5.2
I
LOAD
= 50mA
5.1
200
OUTPUT VOLTAGE (V)
2.50
OUTPUT VOLTAGE (V)
5.0
2.45
4.9
2.40
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
4.8
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
0
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK25)
MAX8877-10
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK50)
MAX8877-11
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
70
60
50
PSRR (dB)
250
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
100
200
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
200
150
T
A
= +85°C
T
A
= +25°C
C
OUT
= 10µF
150
40
30
20
10
I
LOAD
= 50mA
C
BP
= 0.1µF
0.01
0.1
1
10
100
1000
C
OUT
= 1µF
100
T
A
= -40°C
50
50
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
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
MAX8877-13
OUTPUT NOISE vs. BP CAPACITANCE
70
OUTPUT NOISE (µV
RMS
)
60
50
MAX887_EUK50
40
30
20
MAX887_EUK25
10
0
10
0
0.001
0.01
BP CAPACITANCE (µF)
0.1
1
MAX887_EUK30
C
OUT
= 10µF
I
LOAD
= 10mA
f = 10Hz to 100kHz
MAX8877-14
OUTPUT NOISE vs. LOAD CURRENT
60
50
OUTPUT NOISE (µV
RMS
)
40
MAX887_EUK30
30
20
C
OUT
= 10µF
C
BP
= 0.01µF
f = 10Hz to 100kHz
10
100
1000
MAX887_EUK25
MAX887_EUK50
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
10
C
BP
= 0.01µF
I
LOAD
= 10mA
80
1
C
OUT
= 1µF
0.1
C
OUT
= 10µF
0.01
0
1
10
FREQUENCY (kHz)
100
1000
LOAD CURRENT (mA)
4
_______________________________________________________________________________________
Low-Noise, Low-Dropout, 150mA Linear
Regulators with '2982 Pinout
Typical Operating Characteristics (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 0.01µF, T
A
= +25°C, unless otherwise
noted.)
OUTPUT NOISE 10Hz TO 100kHz
MAX8877-16
MAX8877/MAX8878
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
MAX8877-17
100
10
C
OUT
ESR (Ω)
C
OUT
= 10µF
V
OUT
50µV/div
1
STABLE REGION
0.1
C
OUT
= 1µF
0.01
1ms/div
MAX887_EUK25, C
OUT
= 10µF, I
LOAD
= 10mA, C
BP
= 0.1µF
0
100
LOAD CURRENT (mA)
150
LINE-TRANSIENT RESPONSE
MAX8877-18
LOAD-TRANSIENT RESPONSE
MAX8877-19
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX8877-20
4V
3V
V
IN
3.01V
3.00V
2.99V
V
OUT
3.01V
3.00V
2.99V
V
OUT
3.001V
3.000V
2.999V
V
OUT
50mA
I
LOAD
50mA
I
LOAD
100µs/div
MAX887_EUK30, I
LOAD
= 50mA
10µs/div
MAX887_EUK30, V
IN
= V
OUT
+ 0.5V,
C
IN
= 10µF, I
LOAD
= 0mA TO 50mA
10µs/div
MAX887_EUK30, V
IN
= V
OUT
+ 0.1V,
C
IN
= 10µF, I
LOAD
= 0mA TO 50mA
MAX887_EUK25
SHUTDOWN EXIT DELAY
MAX8877-21
MAX887_EUK50
SHUTDOWN EXIT DELAY
MAX8877-22
ENTERING SHUTDOWN
MAX8877-23
2V
0V
C
BP
= 0.01µF
V
SHDN
2V
0V
C
BP
= 0.01µF
V
SHDN
2V
0V
5V
V
SHDN
2V
C
BP
= 0.1µF
V
OUT
4V
C
BP
= 0.1µF
V
OUT
V
OUT
1V
2V
0V
5µs/div
MAX887_EUK25, I
LOAD
= 50mA
5µs/div
MAX887_EUK50, I
LOAD
= 50mA
0V
500µs/div
MAX8878, NO LOAD
0V
_______________________________________________________________________________________
5
电子竞赛
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
