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MAX8559EBAII-MAX8559ETAJ2
Dual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
General DescriptionThe 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.
ApplicationsCellular and Cordless Phones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
PCMCIA Cards
Wireless LAN Cards
Hand-Held Instruments
FeaturesTwo 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
Typical Operating Circuit19-3121; Rev 0; 1/04
*xy = Output voltage code (see the Output Voltage
Selector Guide).
**EP = Exposed pad.
†Future product—contact factory for availability.
Output Voltage Selector Guide appears at end of data sheet.
Pin Configurations
MAX8559
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
ABSOLUTE MAXIMUM RATINGSStresses 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)
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)
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.)
MAX8559
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFNypical 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.)
MAX8559
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFNypical 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.)
MAX8559
Detailed DescriptionThe 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 LoopThe 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 TransistorThe 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
