19-2732; Rev 3; 5/06
Ultra-Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulators
General Description
The MAX8510/MAX8511/MAX8512 ultra-low-noise, low-
dropout (LDO) linear regulators are designed to deliver
up to 120mA continuous output current. These regula-
tors achieve a low 120mV dropout for 120mA load cur-
rent. The MAX8510 uses an advanced architecture to
achieve ultra-low output voltage noise of 11µV
RMS
and
PSRR of 54dB at 100kHz.
The MAX8511 does not require a bypass capacitor,
hence achieving the smallest PC board area. The
MAX8512’s output voltage can be adjusted with an
external divider.
The MAX8510/MAX8511 are preset to a variety of volt-
ages in the 1.5V to 4.5V range. Designed with a P-channel
MOSFET series pass transistor, the MAX8510/MAX8511/
MAX8512 maintain very low ground current (40µA).
The regulators are designed and optimized to work with
low-value, low-cost ceramic capacitors. The MAX8510
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
Package options include a 5-pin SC70 and a tiny 2mm x
2mm x 0.8mm TDFN package.
Features
♦
Space-Saving SC70 and TDFN (2mm x 2mm) Packages
♦
11µV
RMS
Output Noise at 100Hz to 100kHz
Bandwidth (MAX8510)
♦
78dB PSRR at 1kHz (MAX8510)
♦
120mV Dropout at 120mA Load
♦
Stable with 1µF Ceramic Capacitor for Any Load
♦
Guaranteed 120mA Output
♦
Only Need Input and Output Capacitors (MAX8511)
♦
Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 3V, 3.3V, 4.5V (MAX8510/MAX8511) and
Adjustable (MAX8512)
♦
Low 40µA Ground Current
♦
Excellent Load/Line Transient
♦
Overcurrent and Thermal Protection
MAX8510/MAX8511/MAX8512
Ordering Information
PART*
TEMP RANGE
PIN-PACKAGE
MAX8510EXKxy-T
-40°C to +85°C
5 SC70-5
*xy
is the output voltage code (see Output Voltage Selector
Guide). Other versions between 1.5V and 4.5V are available in
100mV increments. Contact factory for other versions.
Applications
Cellular and Cordless Phones
PDA and Palmtop Computers
Base Stations
Bluetooth Portable Radios and Accessories
Wireless LANs
Digital Cameras
Personal Stereos
Portable and Battery-Powered Equipment
Ordering Information continued at end of data sheet.
Typical Operating Circuits
INPUT
2V TO 6V
C
IN
= 1µF
ON
OFF
IN
OUT
OUTPUT PRESET
1.5V TO 4.5V
MAX8510
SHDN
GND
BP
C
BP
= 10nF
C
OUT
= 1µF
Output Voltage Selector Guide appears at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
Pin Configuration
TOP VIEW
IN
1
5
OUT
N.C.
BP (MAX8510)
N.C. (MAX8511)
FB (MAX8512)
GND
BP (MAX8510)
4
N.C. (MAX8511)
FB (MAX8512)
SHDN
1
2
3
4
8
N.C.
OUT
N.C.
IN
+
GND
2
MAX8510
MAX8511
MAX8512
MAX8510
MAX8511
MAX8512
7
6
5
SHDN
3
SC70
A "+" SIGN WILL REPLACE THE FIRST
PIN INDICATOR ON LEAD-FREE PACKAGES.
TDFN 2mm
×
2mm
________________________________________________________________
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.
Ultra-Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulators
MAX8510/MAX8511/MAX8512
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +7V
Output Short-Circuit Duration ............................................Infinite
OUT,
SHDN
to GND ......................................-0.3V to (IN + 0.3V)
FB, BP, N.C. to GND..................................-0.3V to (OUT + 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............0.247W
8-Pin TDFN (derate 61.9mW/°C above = 70°C) ..........0.953W
θ
JA
5-Pin SC70 ................................................................324°C/W
8-Pin TDFN ...............................................................83.9°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-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
+ 0.5V, T
A
= -40°C to +85°C, unless otherwise noted. C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 10nF. Typical values are at +25°C;
the MAX8512 is tested with 2.45V output, unless otherwise noted.) (Note 1)
PARAMETER
Input Voltage Range
Output Voltage Accuracy
Maximum Output Current
Current Limit
I
OUT
I
LIM
OUT = 90% of nominal value
V
OUT
≥
3V, I
OUT
= 80mA
V
OUT
≥
3V, I
OUT
= 120mA
Dropout Voltage (Note 2)
2.5V
≤
V
OUT
< 3V, I
OUT
= 80mA
2.5V
≤
V
OUT
< 3V, I
OUT
= 120mA
2V
≤
V
OUT
< 2.5V, I
OUT
= 80mA
2V
≤
V
OUT
< 2.5V, I
OUT
= 120mA
Ground Current
Line Regulation
Load Regulation
Shutdown Supply Current
I
Q
V
LNR
V
LDR
I
SHDN
I
OUT
= 0.05mA
V
IN
= V
OUT
(nom) - 0.1V, I
OUT
= 0mA
V
IN
= (V
OUT
+ 0.5V) to 6V, I
OUT
= 0.1mA
I
OUT
= 1mA to 80mA
SHDN
= 0V
f = 1kHz, I
OUT
= 10mA
Ripple Rejection
PSRR
f = 10kHz, I
OUT
= 10mA
f = 100kHz, I
OUT
= 10mA
T
A
= +25°C
T
A
= +85°C
MAX8510
MAX8511/MAX8512
MAX8510
MAX8511/MAX8512
MAX8510
MAX8511/ MAX8512
SYMBOL
V
IN
I
OUT
= 1mA, T
A
= +25°C
I
OUT
= 100µA to 80mA, T
A
= +25°C
I
OUT
= 100µA to 80mA
CONDITIONS
MIN
2
-1
-2
-3
120
130
200
80
120
90
135
120
180
40
220
0.001
0.003
0.003
0.05
78
72
75
65
54
46
dB
1
90
500
µA
%/V
%/mA
µA
250
200
mV
300
170
TYP
MAX
6
+1
+2
+3
mA
mA
%
UNITS
V
2
_______________________________________________________________________________________
Ultra-Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulators
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
OUT
+ 0.5V, T
A
= -40°C to +85°C, unless otherwise noted. C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 10nF. Typical values are at +25°C;
the MAX8512 is tested with 2.45V output, unless otherwise noted.) (Note 1)
PARAMETER
Output Noise Voltage
(RMS)
Shutdown Exit Delay
SHDN
Logic Low Level
SHDN
Logic High Level
SHDN
Input Bias Current
FB Input Bias Current
(MAX8512)
Thermal Shutdown
Thermal-Shutdown
Hysteresis
SYMBOL
CONDITIONS
f = 100Hz to 100kHz,
I
LOAD
= 10mA
f = 100Hz to 100kHz,
I
LOAD
= 80mA
R
LOAD
= 50Ω (Note3)
V
IN
= 2V to 6V
V
IN
= 2V to 6V
V
IN
= 6V,
SHDN
= 0V or
6V
V
IN
= 6V,V
FB
= 1.3V
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
0.01
0.006
0.01
160
10
0.1
1.5
MAX8510
MAX8511/MAX8512
MAX8510
MAX8511/MAX8512
MIN
TYP
11
230
13
230
300
0.4
µs
V
V
µA
µA
°C
°C
µV
MAX
UNITS
MAX8510/MAX8511/MAX8512
Note 1:
Limits are 100% tested at +25°C. Limits over operating temperature range are guaranteed by design.
Note 2:
Dropout 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 90% of final value.
Typical Operating Characteristics
(V
IN
= V
OUT
+ 0.5V, C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 10nF, T
A
= +25°C, unless otherwise noted.)
MAX8510
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
MAX8510 toc01
MAX8510 toc02
MAX8510
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.0
2.5
OUTPUT VOLTAGE (V)
I
OUT
= 0mA
% DEVIATION (%)
0.2
0
-0.2
-0.4
-0.6
0
2.0
1.5
1.0
0.5
0.0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
I
OUT
= 120mA
0.6
0.4
MAX8510
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
0.8
0.6
% DEVIATION (%)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
IOUT = 1mA
MAX8510 toc03
1.0
20
40
60
80
100
120
-40
-15
10
35
60
85
LOAD CURRENT (mA)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Ultra-Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulators
MAX8510/MAX8511/MAX8512
Typical Operating Characteristics (continued)
(V
IN
= V
OUT
+ 0.5V, C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 10nF, T
A
= +25°C, unless otherwise noted.)
MAX8510
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8510 toc04
MAX8510
DROPOUT VOLTAGE vs. OUTPUT VOLTAGE
MAX8510 toc05
MAX8510
GROUND PIN CURRENT vs. INPUT VOLTAGE
I
OUT
= 120mA
300
GROUND PIN CURRENT (µA)
250
200
150
100
50
I
OUT
= 0mA
MAX8510 toc06
150
T
A
= +85°C
DROPOUT VOLTAGE (mV)
120
T
A
= +25°C
90
250
I
OUT
= 80mA
DROPOUT VOLTAGE (mV)
200
350
150
60
T
A
= -40°C
30
100
50
0
0
20
40
60
80
100
120
LOAD CURRENT (mA)
0
2.0
2.2
2.4
2.6
2.8
3.0
3.2
OUTPUT (V)
0
0
1
2
3
4
5
INPUT VOLTAGE (V)
MAX8510
GROUND PIN CURRENT vs. LOAD CURRENT
MAX8510 toc 07
MAX8510
GROUND PIN CURRENT vs. TEMPERATURE
MAX8510 toc08
MAX8510
PSRR vs. FREQUENCY
80
70
60
PSRR (dB)
50
40
30
MAX8510 toc09
240
200
160
V
IN
= 3.8V
120
80
40
0
0
20
40
60
80
100
V
IN
= 5.5V
50
90
GROUND PIN CURRENT (µA)
GROUND PIN CURRENT (µA)
45
40
35
20
10
I
LOAD
= 10mA
C
BP
= 10nF
0.01
0.1
1
10
100
1000
30
120
-40
-15
10
35
60
85
LOAD CURRENT (mA)
TEMPERATURE (°C)
0
FREQUENCY (kHz)
MAX8511
PSRR vs. FREQUENCY
MAX8510 toc10
MAX8510
OUTPUT NOISE
MAX8510 toc11
MAX8510
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
1.E+04
OUTPUT NOISE DENSITY (nV/√Hz)
MAX8510 toc12
90
80
70
60
PSRR (dB)
50
40
30
20
10
0
0.01
0.1
1
10
100
I
LOAD
= 10mA
V
IN
= 3.8V
I
LOAD
= 10mA
V
NOISE
= 11µV
RMS
1.E+03
1.E+02
20µV/div
1000
400µs/div
1.E+01
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
4
_______________________________________________________________________________________
Ultra-Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulators
Typical Operating Characteristics (continued)
(V
IN
= V
OUT
+ 0.5V, C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 10nF, T
A
= +25°C, unless otherwise noted.)
MAX8510
OUTPUT NOISE vs. BP CAPACITANCE
MAX8510 toc13
MAX8510/MAX8511/MAX8512
MAX8510
LOAD TRANSIENT RESPONSE
MAX8510 toc14
MAX8510
LOAD TRANSIENT RESPONSE NEAR DROPOUT
MAX8510 toc15
25
20
OUTPUT NOISE (µV)
V
IN
= 3.5V
I
LOAD
= 0 TO 50mA
V
IN
= 3.1V
I
LOAD
= 0 TO 50mA
15
10
V
OUT
10mV/div
5
V
OUT
10mV/div
0
1
10
BP CAPACITANCE (nF)
100
1ms/div
1ms/div
MAX8510
LINE TRANSIENT RESPONSE
MAX8510 toc16
MAX8510
EXITING SHUTDOWN WAVEFORM
MAX8510 toc17
MAX8510
ENTERING SHUTDOWN DELAY
MAX8510 toc18
V
IN
= 3.5V TO 4V
SHUTDOWN VOLTAGE
V
OUT
= 2.85V
R
LOAD
= 47Ω
C
BP
= 0.01µF
SHUTDOWN
VOLTAGE
OUTPUT VOLTAGE
2V/div
V
OUT
2mV/div
200µs/div
20µs/div
OUTPUT VOLTAGE
2V/div
40µs/div
MAX8510
SHUTDOWN EXIT DELAY
MAX8510 toc19
MAX8510
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
MAX8510 toc20
V
OUT
= 3V
C
BP
= 100nF
V
OUT
1V/div
C
OUT
ESR (Ω)
100
10
1
SHUTDOWN
VOLTAGE
0.1
STABLE REGION
0.01
0
20
40
60
80
100
120
LOAD CURRENT (mA)
20µs/div
_______________________________________________________________________________________
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