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19-3121; Rev 2; 8/05
KIT
ATION
EVALU
BLE
AVAILA
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
General Description
The MAX8559 dual, low-noise, low-dropout (LDO) linear
regulator operates from a 2.5V to 6.5V input voltage
and delivers at least 300mA of continuous output cur-
rent. It offers low output noise and low dropout of only
60mV at 100mA. Typical output noise for this device is
32µV
RMS
, and PSRR is 70dB at 10kHz. Designed with
an internal P-channel MOSFET pass transistor, the
MAX8559 maintains a low 115µA supply current per
LDO, independent of the load current and dropout volt-
age. Other features include short-circuit protection and
thermal-shutdown protection. The MAX8559 includes
two independent logic-controlled shutdown inputs and
is capable of operating without a bypass capacitor to
further reduce total solution size. The MAX8559 is avail-
able in a miniature 8-bump UCSP™ (2mm x 1mm) or
8-pin TDFN (3mm x 3mm) package.
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
Features
Two Low-Dropout-Voltage Regulators
Low 32µV
RMS
Output Noise
300mA Output Current for Each LDO
70dB PSRR at 10kHz
Independent Shutdown Controls
Low 60mV Dropout at 100mA Load
115µA Operating Supply Current per LDO
1.5V to 3.3V Factory-Preset Output
Small Ceramic Output Capacitors
Output Current Limit
Thermal-Overload and Short-Circuit Protection
1.95W Power-Dissipation Capability (TDFN)
2mm
2
Footprint (UCSP)
MAX8559
Ordering Information
Applications
Cellular and Cordless Phones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
PCMCIA Cards
Wireless LAN Cards
Handheld Instruments
PART
MAX8559EBAxy*-T
MAX8559EBAxy*+T
MAX8559ETAxy*-T
MAX8559ETAxy*+T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 UCSP (B8-1)
8 UCSP (B8-1)
8 TDFN-EP**
8 TDFN-EP**
*xy
= Output voltage code (see the Output Voltage
Selector Guide).
**EP
= Exposed pad.
+Denotes
lead-free package.
Typical Operating Circuit
OUTA
TOP VIEW
Pin Configurations
GND
BP
OUTB
INPUT
2.5V TO 6.5V
2.2μF
min
8
7
6
5
INA
INB
OUTA
1.5V TO 3.3V
2.2μF/150mA
4.7μF/300mA
MAX8559ETA
ON
OFF
ON
OFF
SHDNB
GND
BP
0.01μF
(OPTIONAL)
SHDNA
MAX8559
OUTB
1.5V TO 3.3V
2.2μF/150mA
4.7μF/300mA
INA
2
SHDNA
3
SHDNB
4
INB
TDFN
3mm x 3mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configurations continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Output Voltage Selector Guide appears at end of data sheet.
________________________________________________________________
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.
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
MAX8559
ABSOLUTE MAXIMUM RATINGS
INA, INB,
SHDNA, SHDNB,
BP to GND ...................-0.3V to +7V
INA to INB..............................................................-0.3V to +0.3V
OUTA, OUTB to GND ..................................-0.3V to (V
IN
+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Bump UCSP (derate 4.7mW/°C above +70°C)..........379mW
8-Pin TDFN (derate 24.4mW/°C above +70°C) ..........1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
8-Pin TDFN Lead Temperature (soldering, 10s)..............+300°C
8-Bump UCSP Solder Profile...........................................(Note 1)
Note 1:
For UCSP solder profile information, please refer to the application note APP_1891 on the Maxim website, www.maxim-ic.com.
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
= 3.8V,
SHDNA
=
SHDNB
= IN_, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage
Undervoltage-Lockout Threshold
SYMBOL
V
IN
V
UVLO
V
IN
rising, hysteresis is 40mV (typ)
T
A
= +25°C, I
OUTA
= I
OUTB
= 1mA
Output Voltage Accuracy
T
A
= -40°C to +85°C, I
OUTA
= I
OUTB
= 1mA
T
A
= -40°C to +85°C, I
OUTA
or I
OUTB
=
0.1mA to 300mA
Maximum Output Current
Output Current Limit
Ground Current
Dropout Voltage
(Note 2)
Line Regulation
I
OUT_
I
LIM_
No load
I
Q
V
OUT_
-
V
IN_
ΔV
LNR
No load, one LDO shutdown
I
OUTA
= I
OUTB
= 100mA
I
OUT_
= 1mA
I
OUT_
= 100mA
V
IN_
= (V
OUT_
+ 0.1V) to 6.5V, I
OUT_
= 1mA
100Hz to 100kHz, C
OUT_
= 10µF,
I
OUT_
= 1mA, C
BP
= 0.01µF
100Hz to 100kHz, C
OUT_
= 10µF,
I
OUT_
= 1mA, C
BP
= not installed
V
IN_
= V
OUT_
+ 1V, 10kHz
C
BP
= 0.01µF,
C
OUT_
= 2.2µF,
100kHz
I
OUT_
= 50mA
-0.15
CONDITIONS
MIN
2.5
2.15
-1
-2
-3
300
310
550
180
115
220
0.6
60
0
32
µV
RMS
254
70
dB
54
120
+0.15
mV
%/ V
920
290
µA
2.35
TYP
MAX
6.5
2.45
+1
+2
+3
mA
mA
%
UNITS
V
V
Output Voltage Noise
Power-Supply Ripple Rejection
PSRR
SHUTDOWN
Shutdown Supply Current
SHDN
Input Threshold
I
SHDN
V
IH
V
IL
SHDN_
= 0V
Input high voltage
Input low voltage
T
A
= +25°C
T
A
= -40°C to +85°C
1.6
0.4
0.01
0.1
1
µA
V
2
_______________________________________________________________________________________
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.8V,
SHDNA
=
SHDNB
= IN_, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SHDN
Input Bias Current
V
OUT_
Discharge Resistance in
Shutdown
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
SHDN
ΔT
SHDN
T
J
rising
+160
10
°C
°C
SYMBOL
I
SHDN
SHDN_
= IN or
GND
SHDN_
= GND
CONDITIONS
T
A
= +25°C
T
A
= -40°C to +85°C
MIN
TYP
10
100
385
MAX
100
UNITS
nA
Ω
MAX8559
Note 1:
All units are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:
The dropout voltage is defined as V
IN
- V
OUT
when V
OUT
is 100mV below the nominal value of V
OUT
. Specification only
applies when V
OUT
≥
2.5V.
Typical Operating Characteristics
(V
OUTA
= V
OUTB
= 2.85V, V
INA
= V
INB
= 3.8V, C
OUT
= 2.2µF (or 4.7µF for 300mA), C
BP
= 0.01µF, and C
IN
= 2.2µF (or 4.7µF for
300mA), unless otherwise noted.)
GROUND CURRENT
vs. SUPPLY VOLTAGE
MAX8559 toc01
GROUND CURRENT
vs. LOAD CURRENT
MAX8559 toc02
GROUND CURRENT
vs. TEMPERATURE
225
200
GROUND CURRENT (μA)
175
150
125
100
75
50
25
0
NO LOAD, BOTH OUTPUTS
100mA LOAD, BOTH OUTPUTS
MAX8559 toc03
300
250
GROUND CURRENT (μA)
200
150
100
50
NO LOAD, BOTH OUTPUTS
100mA LOAD, BOTH OUTPUTS
225
200
GROUND CURRENT (μA)
175
150
125
100
75
50
25
BOTH OUTPUTS LOADED
250
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
0
0
50
100
150
200
250
300
LOAD CURRENT (mA)
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
MAX8559
Typical Operating Characteristics (continued)
(V
OUTA
= V
OUTB
= 2.85V, V
INA
= V
INB
= 3.8V, C
OUT
= 2.2µF (or 4.7µF for 300mA), C
BP
= 0.01µF, and C
IN
= 2.2µF (or 4.7µF for
300mA), unless otherwise noted.)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8559 toc04
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
MAX8559 toc05
200
180
160
DROPOUT VOLTAGE (mV)
140
120
100
80
60
40
20
0
0
50
100
150
200
250
0
OUTPUT VOLTAGE ACCURACY (%)
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
300
0
50
100
150
200
250
300
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
0.3
OUTPUT VOLTAGE ACCURACY (%)
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-40
-15
10
35
60
85
TEMPERATURE (°C)
100mA LOAD, BOTH OUTPUTS
PSRR (dB)
50
40
30
20
10
100mA LOAD, BOTH OUTPUTS
MAX8559 toc06
PSRR vs. FREQUENCY
70
60
MAX8559 toc07
0.4
80
I
OUTA
= 50mA
0
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY
MAX8559 toc08
OUTPUT-NOISE SPECTRAL DENSITY
vs. FREQUENCY
R
LOAD
= 100Ω
NOISE DENSITY (nV/√Hz)
MAX8559 toc09
100
CHANNEL-TO-CHANNEL ISOLATION (dB)
90
80
70
60
50
40
30
20
10
0
0.01
0.1
1
10
100
I
OUTA
= 10mA
10,000
1000
100
10
1000
0.01
0.1
1
FREQUENCY (kHz)
10
100
FREQUENCY (kHz)
4
_______________________________________________________________________________________
Microchip MCU
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