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MAX8559EBAJJ+TMAXIMN/a2500avaiDual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
MAX8559ETAAA+ |MAX8559ETAAAMAXIMN/a506avaiDual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
MAX8559ETAAJ+ |MAX8559ETAAJMAXIMN/a393avaiDual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
MAX8559ETAAJ+TMAXIMN/a2200avaiDual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
MAX8559ETADK+T |MAX8559ETADKTMAXIMN/a9316avaiDual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
MAX8559ETAJ1+TMAXIMN/a260avaiDual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
MAX8559ETAJ2+ |MAX8559ETAJ2MAXIMN/a278avaiDual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
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MAX8559ETAM1+TMAXN/a10000avaiDual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN


MAX8559ETAJJ+T ,Dual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFNFeatures♦ Two Low-Dropout-Voltage RegulatorsThe MAX8559 dual, low-noise, low-dropout (LDO) linearre ..
MAX8559ETAM1+T ,Dual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFNMAX855919-3121; Rev 2; 8/05Dual, 300mA, Low-Noise Linear Regulatorwith Independent Shutdown in UCSP ..
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MAX8560EZK-T ,4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFNELECTRICAL CHARACTERISTICS(V = 3.6V, SHDN = IN, T = -40°C to +85°C, typical values are at T = +25°C ..
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MAX8559EBAJJ+T-MAX8559ETAAA+-MAX8559ETAAJ+-MAX8559ETAAJ+T-MAX8559ETADK+T-MAX8559ETAJ1+T-MAX8559ETAJ2+-MAX8559ETAJJ+-MAX8559ETAJJ+T-MAX8559ETAM1+T
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
32µVRMS, 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.
Applications

Cellular and Cordless Phones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
PCMCIA Cards
Wireless LAN Cards
Handheld Instruments
Features
Two Low-Dropout-Voltage RegulatorsLow 32µVRMSOutput Noise300mA Output Current for Each LDO70dB PSRR at 10kHzIndependent Shutdown ControlsLow 60mV Dropout at 100mA Load115µA Operating Supply Current per LDO1.5V to 3.3V Factory-Preset OutputSmall Ceramic Output CapacitorsOutput Current LimitThermal-Overload and Short-Circuit Protection1.95W Power-Dissipation Capability (TDFN)2mm2Footprint (UCSP)
MAX8559
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
Ordering Information

OFF
OFF
MAX8559
INPUT
2.5V TO 6.5V
2.2μF
minINB
SHDNA
SHDNB
INA
GND
OUTB
OUTA0.01μF
(OPTIONAL)
2.2μF/150mA
4.7μF/300mA
1.5V TO 3.3V
2.2μF/150mA
4.7μF/300mA
1.5V TO 3.3V
Typical Operating Circuit

19-3121; Rev 2; 8/05
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGE

MAX8559EBAxy*-T-40°C to +85°C8 UCSP (B8-1)
MAX8559EBAxy*+T-40°C to +85°C8 UCSP (B8-1)
MAX8559ETAxy*-T-40°C to +85°C8 TDFN-EP**
MAX8559ETAxy*+T-40°C to +85°C8 TDFN-EP**
*xy = Output voltage code (see the Output Voltage
Selector Guide).
**EP = Exposed pad.
+Denotes lead-free package.
Output Voltage Selector Guide appears at end of data sheet.
Pin Configurations

GND
OUTB
INB
OUTABP
SHDNASHDNB
INA
TDFN
3mm x 3mm
4
MAX8559ETA765
TOP VIEW
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.
MAX8559
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
ABSOLUTE MAXIMUM RATINGS

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.
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 (VIN+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA= +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)
ELECTRICAL CHARACTERISTICS

(VIN= 3.8V, SHDNA= SHDNB= IN_, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Input VoltageVIN2.56.5V
Undervoltage-Lockout ThresholdVUVLOVIN rising, hysteresis is 40mV (typ)2.152.352.45V
TA = +25°C, IOUTA = IOUTB = 1mA-1+1
TA = -40°C to +85°C, IOUTA = IOUTB = 1mA-2+2Output Voltage Accuracy
TA = -40°C to +85°C, IOUTA or IOUTB =
0.1mA to 300mA-3+3
Maximum Output CurrentIOUT_300mA
Output Current LimitILIM_310550920mA
No load180290
No load, one LDO shutdown115Ground CurrentIQ
IOUTA = IOUTB = 100mA220
IOUT_ = 1mA0.6Dropout Voltage
(Note 2)
VOUT_ -
VIN_IOUT_ = 100mA60120mV
Line RegulationΔVLNRVIN_ = (VOUT_ + 0.1V) to 6.5V, IOUT_ = 1mA-0.150+0.15%/ V
100Hz to 100kHz, COUT_ = 10µF,
IOUT_ = 1mA, CBP = 0.01µF32
Output Voltage Noise
100Hz to 100kHz, COUT_ = 10µF,
IOUT_ = 1mA, CBP = not installed254
µVRMS
10kHz70
Power-Supply Ripple RejectionPSRR
VIN_ = VOUT_ + 1V,
CBP = 0.01µF,
COUT_ = 2.2µF,
IOUT_ = 50mA100kHz54
SHUTDOWN

TA = +25°C0.011Shutdown Supply CurrentISHDNSHDN_ = 0VTA = -40°C to +85°C0.1µA
VIHInput high voltage1.6SHDN Input ThresholdVILInput low voltage0.4V
Note 1:
For UCSP solder profile information, please refer to the application note APP_1891 on the Maxim website, .
MAX8559
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
ELECTRICAL CHARACTERISTICS (continued)

(VIN= 3.8V, SHDNA= SHDNB= IN_, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

TA = +25°C10100SHDN Input Bias CurrentISHDNSHDN_ = IN or
GNDTA = -40°C to +85°C100nA
VOUT_ Discharge Resistance in
ShutdownSHDN_ = GND385Ω
THERMAL PROTECTION

Thermal-Shutdown TemperatureTSHDNTJ rising+160°C
Thermal-Shutdown HysteresisΔTSHDN10°C
Note 1:
All units are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:
The dropout voltage is defined as VIN- VOUTwhen VOUTis 100mV below the nominal value of VOUT. Specification only
applies when VOUT≥2.5V.
Typical Operating Characteristics

(VOUTA= VOUTB= 2.85V, VINA= VINB= 3.8V, COUT= 2.2µF (or 4.7µF for 300mA), CBP= 0.01µF, and CIN= 2.2µF (or 4.7µF for
300mA), unless otherwise noted.)
GROUND CURRENT
vs. SUPPLY VOLTAGE
MAX8559 toc01
SUPPLY VOLTAGE (V)
GROUND CURRENT (
100mA LOAD, BOTH OUTPUTS
NO LOAD, BOTH OUTPUTS
GROUND CURRENT
vs. LOAD CURRENT
MAX8559 toc02
LOAD CURRENT (mA)
GROUND CURRENT (
BOTH OUTPUTS LOADED
GROUND CURRENT
vs. TEMPERATURE
MAX8559 toc03
TEMPERATURE (°C)
GROUND CURRENT (
100mA LOAD, BOTH OUTPUTS
NO LOAD, BOTH OUTPUTS
MAX8559
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN

DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8559 toc04
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
MAX8559 toc05
LOAD CURRENT (mA)
OUTPUT VOLTAGE ACCURACY (%)
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
MAX8559 toc06
TEMPERATURE (°C)
OUTPUT VOLTAGE ACCURACY (%)
100mA LOAD, BOTH OUTPUTS
100mA LOAD, BOTH OUTPUTS
PSRR vs. FREQUENCY

MAX8559 toc07
FREQUENCY (kHz)
PSRR (dB)
IOUTA = 50mA
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY

MAX8559 toc08
CHANNEL-TO-CHANNEL ISOLATION (dB)
IOUTA = 10mA
OUTPUT-NOISE SPECTRAL DENSITY
vs. FREQUENCY

MAX8559 toc09
NOISE DENSITY (nV/
Hz)10.1
10,000
RLOAD = 100Ωypical Operating Characteristics (continued)
(VOUTA= VOUTB= 2.85V, VINA= VINB= 3.8V, COUT= 2.2µF (or 4.7µF for 300mA), CBP= 0.01µF, and CIN= 2.2µF (or 4.7µF for
300mA), unless otherwise noted.)
40μs/div
LINE TRANSIENT

VOUTA10mV/div
AC-COUPLED
MAX8559 toc11
VINA4.5V
3.5V
1V/div
IOUTA = 100mA
10μs/div
LOAD TRANSIENT

IOUTA100mA/div
MAX8559 toc12
VOUTA20mV/div
AC-COUPLED
MAX8559
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN

10μs/div
LOAD TRANSIENT
NEAR DROPOUT

IOUTA100mA/div
MAX8559 toc13
VOUTA20mV/div
AC-COUPLED
1ms/div
SHUTDOWN RESPONSE

VSHDNA1V/div
MAX8559 toc14
VOUTA
1V/divypical Operating Characteristics (continued)
(VOUTA= VOUTB= 2.85V, VINA= VINB= 3.8V, COUT= 2.2µF (or 4.7µF for 300mA), CBP= 0.01µF, and CIN= 2.2µF (or 4.7µF for
300mA), unless otherwise noted.)
1ms/div
OUTPUT NOISE
(10Hz to 100kHz)

VOUT_500μV/div
MAX8559 toc10
MAX8559
Detailed Description

The MAX8559 is a dual, low-noise, low-dropout, low-qui-
escent-current linear regulator designed primarily for
battery-powered applications. The regulators are avail-
able with preset 1.5V to 3.3V output voltages. These out-
puts can supply loads up to 300mA with a 4.7µF output
capacitor, or up to 150mA with a 2.2µF output capacitor.
As illustrated in the Functional Diagram, the MAX8559
consists of a 1.25V reference, error amplifiers, P-chan-
nel pass transistors, internal feedback voltage-dividers,
and autodischarge circuitry.
Feedback Control Loop

The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
this reference with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than the
reference voltage, the pass-transistor gate is pulled
lower, allowing more current to pass to the output and
increasing the output voltage. If the feedback voltage is
too high, the pass-transistor gate is pulled up, allowing
less current to pass to the output. The output voltage is
fed back through an internal resistor voltage-divider
connected to OUT_.
Internal P-Channel Pass Transistor

The MAX8559 features two 0.6ΩP-channel MOSFET
pass transistors. A P-channel MOSFET provides sever-
al advantages over similar designs using PNP pass
transistors, including longer battery life. It requires no
base drive, reducing quiescent current considerably.
PNP-based regulators waste considerable current in
dropout when the pass transistor saturates, and they
also use high base-drive currents under large loads.
The MAX8559 does not suffer from these problems,
and with both outputs on it only consumes 180µA of
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
Pin Description
PIN
TDFNUCSP
NAMEFUNCTION
A1INALDO A Regulator Input. Connect to INB. Input voltage can range from 2.5V to 6.5V. Bypass INA
with a ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section).
2A2SHDNA
Shutdown A Input. A logic-low on SHDNA shuts down regulator A. If SHDNA and SHDNB are both
low, both regulators and the internal reference are off and the supply current is reduced to 10nA
(typ). If either SHDNA or SHDNB is a logic high, the internal reference is on. Connect SHDNA to
INA for always-on operation of regulator A.
3A3SHDNB
Shutdown B Input. A logic-low on SHDNB shuts down regulator B. If SHDNA and SHDNB are both
low, both regulators and the internal reference are off and the supply current is reduced to 10nA
(typ). If either SHDNA or SHDNB is a logic high, the internal reference is on. Connect SHDNB to
INB for always-on operation of regulator B.A4INBLDO B Regulator Input. Connect to INA. Input voltage can range from 2.5V to 6.5V. Bypass INB
with a ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section).B4OUTB
Regulator B Output. OUTB can source up to 300mA continuous current. Bypass OUTB with a
ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section). During
shutdown, OUTB is internally discharged to GND through a 385Ω resistor.B3GNDGround
7B2BPReference Noise Bypass. Bypass BP with a low-leakage 0.01µF ceramic capacitor for reduced
noise at both outputs.B1OUTA
Regulator A Output. OUTA can source up to 300mA continuous current. Bypass OUTA with a
ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section). During
shutdown, OUTB is internally discharged to GND through a 385Ω resistor.—Exposed
Paddle
Connect to ground plane. EP also functions as a heatsink. Solder to the circuit-board ground
plane to maximize thermal dissipation.
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