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MAX1559ETEMAXIMN/a275avai5-Output Power-Management IC For Low-Cost PDAs


MAX1559ETE ,5-Output Power-Management IC For Low-Cost PDAsELECTRICAL CHARACTERISTICS(V = V = V = V = V = 4.0V, T = 0°C to +85°C, unless otherwise noted. Typi ..
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MAX1559ETE
5-Output Power-Management IC For Low-Cost PDAs
General Description
The MAX1559 is a complete power-management chip
for low-cost personal digital assistants (PDAs) and
portable devices operating from a 1-cell lithium-ion
(Li+) or 3-cell NiMH battery. It includes all the regula-
tors, outputs, and voltage monitors necessary for small
PDAs while requiring a bare minimum of external com-
ponents. Featured are four linear regulators, a DC-DC
boost converter for LCD bias, a microprocessor reset
output, and low-battery shutdown in a miniature QFN
package. For a compatible Li+ charger for both USB
and AC adapter inputs, refer to the MAX1551*.
The four linear regulators feature PMOS pass elements
for efficient low-dropout operation. A MAIN LDO sup-
plies 3.3V at 500mA. A signal-detect (SD) card-slot out-
put supplies 3.3V at 400mA. The COR1 LDO outputs 1V
at 250mA, and the COR2 LDO supplies 1.8V at 30mA.
The SD output and COR2 LDO have pin-controlled
shutdown. For other output-voltage combinations, con-
tact Maxim.
The DC-DC boost converter features an on-board MOSFET
and True Shutdown™ when off. This means that during
shutdown, input power is disconnected from the induc-
tor so that the boost output falls to 0V rather than
remaining one diode drop below the input voltage.
A µP reset output clears when the MAIN LDO achieves
regulation to ensure an orderly start. Thermal shutdown
protects the die from overheating.
The MAX1559 operates from a 3.1V to 5.5V supply and
consumes 50mA of no-load supply current. It is pack-
aged in a 1.3W, 16-pin thin QFN with a power pad on
the underside of the package. The MAX1559 is speci-
fied for operation from -40°C to +85°C.
Applications

PDAs
Organizers
Cellular and Cordless Phones
MP3 Players
Hand-Held Devices
Features
Minimal External Components3.3V, 500mA MAIN LDO 3.3V, 400mA SD Card Output1V, 250mA Core LDO 1.8V, 30mA Second Core LDOHigh-Efficiency LCD BoostLCD 0V True Shutdown when Off50µA Quiescent Current3.1V to 5.5V Input Range
MAX1559
Low-Cost PDAs
Ordering Informationypical Operating Circuit

True Shutdown is a trademark of Maxim Integrated Products, Inc.
*. Patent #6,507,172.
Pin Configuration appears at end of data sheet.
MAX1559
5-Output Power-Management IC For
Low-Cost PDAs
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.
IN, SWIN, ENSD, ENC2, ENLCD, RS,
SDIG to GND.........................................................-0.3V to +6V
LX to GND..............................................................-0.3V to +30V
MAIN, COR1, COR2, REF, LFB to GND......-0.3V to (VIN+ 0.3V)
SWIN to IN.............................................................-0.3V to +0.3V
Current into LX or SWIN.............................................300mARMS
Current Out of SW......................................................300mARMS
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA= +70°C)
16-Pin Thin QFN (derate 16.9mW/°C above +70°C)...1.349W
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
ELECTRICAL CHARACTERISTICS

(VIN= VSWIN= VENSD= VENC2= VENLCD= 4.0V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1559
5-Output Power-Management IC For
Low-Cost PDAs
ELECTRICAL CHARACTERISTICS (continued)

(VIN= VSWIN= VENSD= VENC2= VENLCD= 4.0V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1559
5-Output Power-Management IC For
Low-Cost PDAs
ELECTRICAL CHARACTERISTICS
MAX1559
5-Output Power-Management IC For
Low-Cost PDAs
ELECTRICAL CHARACTERISTICS (continued)

(VIN= VSWIN= VENSD= VENC2= VENLCD= 4.0V, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 2:
Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics

(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1559
5-Output Power-Management IC For
Low-Cost PDAsypical Operating Characteristics (continued)

(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1559
5-Output Power-Management IC For
Low-Cost PDAs
LCD EFFICIENCY vs. LOAD CURRENT

MAX1559 toc13
ILOAD (mA)321
LCD OUTPUT VOLTAGE
vs. LOAD CURRENT

MAX1559 toc14
IIN (mA)
OUTPUT VOLTAGE (V)312
VIN (V)
LCD OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX1559 toc15
OUTPUT VOLTAGE (V)
10ms/div
2.6V
VIN
1V/div
MAIN
1V/div
POWER-ON TIMING FOR 3.3V
MAIN AND RESET SIGNAL

MAX1559 toc16
COR1
1V/div
1V/div
200µs/div
3.6V
VIN
1V/div
MAIN
1V/div
COR1
1V/div
1V/div
POWER-ON TIMING FOR 3.3V
MAIN AND 1V CORE

MAX1559 toc17
4ms/div
3.3V
2.4V
VIN
1V/div
MAIN
1V/div
COR1
1V/div
1V/div
POWER-OFF TIMING FOR 3.3V
MAIN, 1V CORE, AND RESET SIGNAL

MAX1559 toc18ypical Operating Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
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