MAX8873T/S/R, MAX8874T/S/R
Low-Dropout, 120mA Linear Regulators
_______________General Description
____________________________Features
The MAX8873T/S/R and MAX8874T/S/R low-dropout linear regulators operate from a +2.5V to +6.5V input
range and deliver up to 120mA. A PMOS pass transistor allows the low, 82µA supply current to remain independent of load, making these devices ideal for
battery-operated portable equipment such as cellular
phones and cordless phones.
o LP2980 Pin-Compatible SOT23 Package
The devices feature Dual Mode™ operation: their output 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. Total error on
the output is ±3.5%. Output voltages are set on the low
side of popular ranges so that power drain is minimized
for longer battery life. Other features include low-power
shutdown, short-circuit protection, thermal shutdown
protection, and reverse battery protection. The
MAX8874 also includes an auto-discharge function,
which actively discharges the output voltage to ground
when the device is placed in shutdown mode. Both
devices come in a miniature 5-pin SOT23 package.
o Miniature External Components
For dual versions, refer to the MAX8865/MAX8866 data
sheet. For low-noise versions with 30µV RMS output
noise, refer to the MAX8877/MAX8878.
________________________Applications
Cordless Telephones
Modems
PCS Telephones
Hand-Held Instruments
Cellular Telephones
Palmtop Computers
PCMCIA Cards
Electronic Planners
__________Typical Operating Circuit
o Low, 55mV Dropout Voltage at 50mA IOUT
(130mV at 120mA)
o Low, 73µA No-Load Supply Current
Low, 82µA Operating Supply Current (even in
dropout)
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
PINSOT TOP
PACKAGE MARK
ABZH
MAX8873SEUK+T
-40°C to +85°C 5 SOT23
-40°C to +85°C 5 SOT25
MAX8873REUK+T
-40°C to +85°C 5 SOT23
ABZL
MAX8873REUK/V+T
-40°C to +85°C 5 SOT23
AFMM
MAX8874TEUK+T
MAX8874SEUK+T
-40°C to +85°C 5 SOT23
-40°C to +85°C 5 SOT23
ABZK
MAX8874REUK+T
-40°C to +85°C 5 SOT23
ABZM
MAX8873TEUK+T
ABZI
ABZJ
+Denotes a lead-free (Pb)/RoHS-compliant package.
/V denotes an automotive qualified part.
__________________Pin Configuration
TOP VIEW
OUT
IN
BATTERY
CIN
1µF
MAX8873
MAX8874
SHDN
GND
OUTPUT
VOLTAGE
COUT
1µF
IN 1
GND 2
5 OUT
MAX8873
MAX8874
SET
SHDN 3
4 SET
SOT23
Dual Mode is a trademark of Maxim Integrated Products.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1257; Rev 2; 3/13
MAX8873T/S/R, MAX8874T/S/R
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
Storage Temperature Range .............................-65°C to +160°C
Soldering Temperature
Lead(Pb)-Free Packages.............................................+260°C
Packages Containing Lead(Pb)...................................+240°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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SOT23
Junctiont-to-Ambient Thermal Resistance (θJA) ........140°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VIN = +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
Input Voltage (Note 3)
Output Voltage
Adjustable Output Voltage
Range (Note 4)
SYMBOL
CONDITIONS
MIN
VIN
VOUT
Ground Pin Current
MAX
UNITS
6.5
V
2.5
0mA ≤ IOUT ≤ 50mA,
SET = GND
MAX887_T
3.05
3.15
3.25
MAX887_S
2.75
2.84
2.93
MAX887_R
2.70
2.80
2.88
VOUT
VSET
Maximum Output Current
Current Limit (Note 5)
TYP
6.5
120
ILIM
IQ
Dropout Voltage (Note 6)
IOUT = 0mA
73
IOUT = 50mA
82
1.1
IOUT = 50mA
55
120
0
0.15
SET = GND
0.011
0.030
SET tied to OUT
0.006
ΔVLNR
VIN = 2.5V to 6.5V, SET tied to OUT,
IOUT = 1mA
Load Regulation
ΔVLDR
IOUT = 0mA to 50mA
Output Voltage Noise
mA
150
IOUT = 1mA
Line Regulation
10Hz to 1MHz
-0.15
V
mA
280
SET = GND
V
COUT = 1µF
350
COUT = 100µF
220
µA
mV
%/V
%/mA
µVRMS
SHUTDOWN
SHDN Input Threshold
VIH
SHDN Input Bias Current
ISHDN
Shutdown Supply Current
IQSHDN
Shutdown Discharge
Resistance (MAX8874)
2
2.0
VIL
0.4
V SHDN = VIN
VOUT = 0V
TA = +25°C
0
TA = TMAX
0.05
TA = +25°C
0.0001
TA = TMAX
0.02
300
100
1
V
nA
µA
Ω
Maxim Integrated
MAX8873T/S/R, MAX8874T/S/R
Low-Dropout, 120mA Linear Regulators
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
TA = +25°C
1.225
1.25
1.275
TA = TMIN to TMAX
1.215
1.25
1.285
TA = +25°C
0.015
2.5
TA = TMAX
0.5
UNITS
SET INPUT
SET Reference Voltage (Note 4)
VSET
VIN = 2.5V to 6.5V,
IOUT = 1mA
SET Input Leakage Current
(Note 4)
ISET
VSET = 1.3V
V
nA
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TSHDN
170
°C
ΔTSHDN
20
°C
Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods.
Note 3: Guaranteed by line-regulation test.
Note 4: Adjustable mode only.
Note 5: For design purposes, the current limit should be considered 120mA minimum to 420mA maximum.
Note 6: 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, MAX887_T, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. LOAD CURRENT
3.5
MAX8873/74-02
3.25
95
3.0
3.20
3.15
3.10
OUTPUT VOLTAGE (V)
90
SUPPLY CURRENT (μA)
OUTPUT VOLTAGE (V)
100
MAX8873/74-01
3.30
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX8873/74-03
OUTPUT VOLTAGE
vs. LOAD CURRENT
85
80
75
70
65
60
3.05
50
0
20
40
60
80
LOAD CURRENT (mA)
Maxim Integrated
100
120
2.0
NO LOAD
1.5
1.0
0.5
55
3.00
2.5
0
0
20
40
60
80
LOAD CURRENT (mA)
100
120
0
1
2
3
4
5
6
7
INPUT VOLTAGE (V)
3
MAX8873T/S/R, MAX8874T/S/R
Low-Dropout, 120mA Linear Regulators
____________________________Typical Operating Characteristics (continued)
(VIN = +3.6V, CIN = 1µF, COUT = 1µF, MAX887_T, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. TEMPERATURE
3.25
70
OUTPUT VOLTAGE (V)
ILOAD = 0mA
60
50
40
30
20
80
3.20
3.15
3.10
70
60
50
40
30
20
3.05
10
10
3.00
0
3
2
4
6
5
0
-40
7
-20
40
80
60
100
70
MAX8873/74-07
160
TA = +85°C
PSRR (dB)
80
TA = -40°C
COUT = 10μF
40
30
COUT = 1μF
20
40
10
20
0
0
20
40
60
80
0
100
LOAD CURRENT (mA)
0.1
1
10
FREQUENCY (kHz)
100
80
100
10
RL = 50Ω
COUT = 1μF
1
COUT = 100μF
0.10
1000
0.1
1
10
100
1000
FREQUENCY (kHz)
MAX8873/74-8B
COUT = 1μF
60
OUTPUT NOISE DC TO 1MHz
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
1000
40
0.01
0.01
120
20
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
50
TA = +25°C
0
-20
TEMPERATURE (°C)
VOUT = 3.15V
RL = 100Ω
60
120
60
-40
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
DROPOUT VOLTAGE
vs. LOAD CURRENT
100
20
TEMPERATURE (°C)
INPUT VOLTAGE (V)
140
0
OUTPUT SPECTRAL NOISE DENSITY (μV/√Hz)
1
MAX8873/74-08
0
DROPOUT VOLTAGE (mV)
ILOAD = 50mA
90
MAX8873/74-8A
SUPPLY CURRENT (μA)
80
100
MAX8863/4-06
ILOAD = 50mA
SUPPLY CURRENT (μA)
ILOAD = 50mA
90
3.30
MAX8873/74-04
100
SUPPLY CURRENT
vs. TEMPERATURE
MAX8873/74-05
SUPPLY CURRENT
vs. INPUT VOLTAGE
COUT ESR (Ω)
100
INTERNAL FEEDBACK
10
VOUT
EXTERNAL FEEDBACK
1
STABLE REGION
0.1
0.01
0
20
40
60
80
LOAD CURRENT (mA)
4
100
120
1ms/div
ILOAD = 50mA, VOUT IS AC COUPLED
Maxim Integrated
MAX8873T/S/R, MAX8874T/S/R
Low-Dropout, 120mA Linear Regulators
____________________________Typical Operating Characteristics (continued)
(VIN = +3.6V, CIN = 1µF, COUT = 1µF, MAX887_T, TA = +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
3.16V
VOUT 3.15V
3.16V
3.14V
VOUT 3.15V
3.14V
VIN
4.6V
50mA
3.6V
ILOAD
0mA
50μs/div
ILOAD = 50mA, VOUT IS AC COUPLED
10μs/div
ILOAD = 0mA to 50mA, CIN = 10µF, VOUT IS AC COUPLED
LOAD-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
3.16V
3.16V
VOUT 3.15V
VOUT 3.15V
3.14V
3.14V
50mA
ILOAD
0mA
50mA
ILOAD
0mA
10μs/div
10μs/div
VIN = VOUT + 0.2V, ILOAD = 0mA to 50mA, CIN = 10µF,
VOUT IS AC COUPLED
VIN = VOUT + 0.1V, ILOAD = 0mA to 50mA, CIN = 10µF,
VOUT IS AC COUPLED
MAX8874 SHUTDOWN (NO LOAD)
MAX8874 SHUTDOWN
4V
VOUT
4V
2V
VOUT
0V
VSHDN
2V
0V
2V
VSHDN
0V
2V
0V
500µs/div
NO LOAD
Maxim Integrated
200µs/div
ILOAD = 50mA
5
MAX8873T/S/R, MAX8874T/S/R
Low-Dropout, 120mA Linear Regulators
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
1
IN
2
GND
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation.
3
SHDN
Active-Low Shutdown Input. A logic low reduces the supply current to 0.1nA. On the MAX8874, a logic low
also causes the output voltage to discharge to GND. Connect to IN for normal operation.
4
SET
Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to the preset 2.80V
(MAX887_R), 2.84V (MAX887_S), or 3.15V (MAX887_T). Connect to an external resistor divider for
adjustable-output operation. DO NOT LEAVE THIS PIN UNCONNECTED.
5
OUT
Regulator Output. Fixed or adjustable from 1.25V to 6.5V. Sources up to 120mA. Bypass with a 1µF, 5.5V Minimum Load Current
When operating the MAX8873/MAX8874 with an input
voltage above 5.5V, a minimum load current of 20µA is
required to maintain regulation in preset voltage mode.
When setting the output with external resistors, the minimum current through the external feedback resistors
and load must be 30µA.
__________Applications Information
Capacitor Selection and
Regulator Stability
Normally, use a 1µF capacitor on the input and a 1µF
capacitor on the output of the MAX8873/MAX8874.
Larger input capacitor values and lower ESR provide
better supply-noise rejection and transient response. A
higher-value input capacitor (10µF) may be necessary
if large, fast transients are anticipated and the device is
located several inches from the power source. Improve
load-transient response, stability, and power-supply
rejection by using large output capacitors. For stable
operation over the full temperature range, with load currents up to 120mA, a minimum of 1µF is recommended.
8
Power-Supply Rejection and Operation
from Sources Other than Batteries
The MAX8873/MAX8874 are designed to deliver low
dropout voltages and low quiescent currents in batterypowered systems. Power-supply rejection is 62dB at
low frequencies and rolls off above 300Hz. As the frequency increases above 20kHz, the output capacitor is
the major contributor to the rejection of power-supply
noise (see the Power-Supply Rejection Ratio vs.
Frequency graph in the Typical Operating
Characteristics).
When operating from sources other than batteries,
improve supply-noise rejection and transient response
by increasing the values of the input and output capacitors, and by using passive filtering techniques (see the
supply and load-transient responses in the Typical
Operating Characteristics).
Load-Transient Considerations
The MAX8873/MAX8874 load-transient response
graphs (see Typical Operating Characteristics) show
two components of the output response: a DC shift of
the output voltage due to the different load currents
and the transient response. Typical overshoot for step
changes in the load current from 0mA to 50mA is
14mV. Increasing the output capacitor’s value and
decreasing its ESR attenuates transient spikes.
Input-Output (Dropout) Voltage
A regulator’s minimum input-output voltage differential
(or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. Because the
MAX8873/MAX8874 use a P-channel MOSFET pass
transistor, their dropout voltage is a function of RDS(ON)
multiplied by the load current (see Electrical
Characteristics).
Maxim Integrated
MAX8873T/S/R, MAX8874T/S/R
Low-Dropout, 120mA Linear Regulators
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND
PATTERN NO.
6 SOT23
U6F-6
21-0058
90-0175
Maxim Integrated
9
MAX8873T/S/R, MAX8874T/S/R
Low-Dropout, 120mA Linear Regulators
Revision History
REVISION
NUMBER
REVISION
DATE
2
3/13
DESCRIPTION
Added lead-free and automotive designations, added Package Thermal Characteristics, Package
Information, and Revision History sections, and removed Chip Information section
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
10
© 2013 Maxim Integrated Products, Inc.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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