19-2962; Rev 1; 10/03
KIT
ATION
EVALU
BLE
AVAILA
5-Output Power-Management IC For
Low-Cost PDAs
General Description
Features
♦
Minimal External Components
♦
3.3V, 500mA MAIN LDO
♦
3.3V, 400mA SD Card Output
♦
1V, 250mA Core LDO
♦
1.8V, 30mA Second Core LDO
♦
High-Efficiency LCD Boost
♦
LCD 0V True Shutdown when Off
♦
50µA Quiescent Current
♦
3.1V to 5.5V Input Range
MAX1559
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.
Ordering Information
PART
MAX1559ETE
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 Thin QFN
Typical Operating Circuit
INPUT
3.1V TO 5.5V
IN
SWIN
SDIG
MAX1559
REF
COR1
1.0V, 250mA
3.3V, 400mA
MAIN
3.3V, 500mA
Applications
PDAs
Organizers
Cellular and Cordless Phones
MP3 Players
Hand-Held Devices
TO MAIN
SDIG
OFF
ON
ENSD
ENC2
ENLCD
COR2 OFF ON
LCD
OFF
ON
COR2
1.8V, 30mA
SW
D1
LX
LCD 20V,
1mA
LFB
RESET OUT
RS
GND
True Shutdown is a trademark of Maxim Integrated Products, Inc.
Pin Configuration 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.
5-Output Power-Management IC For
Low-Cost PDAs
MAX1559
ABSOLUTE MAXIMUM RATINGS
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 (V
IN
+ 0.3V)
SWIN to IN .............................................................-0.3V to +0.3V
Current into LX or SWIN .............................................300mA
RMS
Current Out of SW ......................................................300mA
RMS
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T
A
= +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
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
SWIN
= V
ENSD
= V
ENC2
= V
ENLCD
= 4.0V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
GENERAL
IN, SWIN Voltage Range
IN Complete Shutdown Threshold
IN Restart Threshold
IN, SWIN Operating Current—All On
IN Operating Current—All On Except LCD
IN Operating Current—MAIN and COR1 On
IN, SWIN Operating Current—Shut Down
REF Output Voltage
LDOs
MAIN Output Voltage
RS
Deassert Threshold for MAIN Rising
RS
Assert Threshold MAIN Falling
MAIN Current Limit
MAIN Dropout Voltage
(0.7Ω typ)
SDIG Output Voltage
SDIG Current Limit
SDIG Dropout Voltage
(0.85Ω typ) (Note 1)
SDIG Reverse Leakage Current
COR1 Output Voltage
COR1 Current Limit
I
LOAD
= 1mA
I
LOAD
= 200mA
I
LOAD
= 400mA
V
SDIG
= 5V, ENSD = V
IN
= GND
I
LOAD
= 100µA to 200mA,
V
IN
= 3.6V to 5.5V
0.960
250
I
LOAD
= 1mA
I
LOAD
= 300mA
I
LOAD
= 500mA
I
LOAD
= 100µA to 200mA,
V
IN
= 3.6V to 5.5V
3.2175
420
I
LOAD
= 100µA to 300mA,
V
IN
= 3.6V to 5.5V
3.2175
3.093
3.0100
630
3.3
3.173
3.094
900
1
210
350
3.3
630
0.80
170
340
7
1
450
300
600
15
1.025
750
µA
V
mA
mV
310
525
3.3825
825
V
mA
mV
3.3825
3.252
3.1755
1200
V
V
V
mA
Operating
V
IN
falling
V
IN
rising
V
LFB
= 1.3V
ENLCD = GND
ENLCD = ENC2 = ENSD = GND, LDO
loads = 0µA
V
SWIN
= V
IN
= 2.9V
I
REF
= 0µA to 5µA
1.235
3.1
2.95
3.51
3
3.6
100
90
50
2
1.25
5.5
3.05
3.69
125
110
65
10
1.265
V
V
V
µA
µA
µA
µA
V
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
5-Output Power-Management IC For
Low-Cost PDAs
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
SWIN
= V
ENSD
= V
ENC2
= V
ENLCD
= 4.0V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
COR2 Output Voltage
COR2 Current Limit
LCD
LX Voltage Range
LX Current Limit
LX On-Resistance
LX Leakage Current
Maximum LX On-Time
Minimum LX Off-Time
LFB Feedback Threshold
LFB Input Bias Current
SW Off Leakage Current
SW PMOS On-Resistance
SW PMOS Peak Current Limit
SW PMOS Ave Current Limit
Soft-Start Time
LOGIC IN AND OUT
EN_ Input Low Level
EN_ Input High Level
EN_ Input Leakage Current
RS,
Output Low Level
RS,
Output High Leakage
THERMAL PROTECTION
Thermal-Shutdown Temperature
Rising temperature
+160
°C
Sinking 1mA, V
IN
= 2.5V
V
OUT
= 5.5V
V
IN
= 3.1V to 5.5V
V
IN
= 3.1V to 5.5V
1.4
0.01
0.25
1
0.4
1
0.4
V
V
µA
V
µA
C
SW
= 1µF
V
LFB
= 1.3V
SW = GND, V
SWIN
= 5.5V, ENLCD = GND
V
LFB
> 1.1V
V
LFB
< 0.8V (soft-start)
V
LX
= 28V
8
0.8
3.9
1.23
11
1
5
1.25
5
0.01
1
700
300
0.13
L1 = 10µH
210
250
1.7
2
14
1.2
6.0
1.27
100
1
1.75
28
285
V
mA
Ω
µA
µs
µs
V
nA
µA
Ω
mA
mA
ms
CONDITIONS
I
LOAD
= 100µA to 20mA,
V
IN
= 3.6V to 5.5V
MIN
1.755
30
TYP
1.8
50
MAX
1.845
100
UNITS
V
mA
MAX1559
_______________________________________________________________________________________
3
5-Output Power-Management IC For
Low-Cost PDAs
MAX1559
ELECTRICAL CHARACTERISTICS
(V
IN
= V
SWIN
= V
ENSD
= V
ENC2
= V
ENLCD
= 4.0V,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
GENERAL
IN, SWIN Voltage Range
IN Complete Shutdown Threshold
IN Restart Threshold
IN, SWIN Operating Current—All On
IN Operating Current—All On Except LCD
IN Operating Current—MAIN and COR1 On
IN, SWIN Operating Current—Shut Down
LDOs
MAIN Output Voltage
RS
Deassert Threshold for MAIN Rising
RS
Assert Threshold MAIN Falling
MAIN Current Limit
MAIN Dropout Voltage
(0.7Ω typ) (Note 1)
SDIG Output Voltage
SDIG Current Limit
I
LOAD
= 1mA
SDIG Dropout Voltage (0.75Ω typ)
SDIG Reverse Leakage Current
COR1 Output Voltage
COR1 Current Limit
COR2 Output Voltage
COR2 Current Limit
LCD
LX Voltage Range
LX Current Limit
LX Leakage Current
Maximum LX On-Time
Minimum LX Off-Time
LFB Feedback Threshold
V
LFB
> 1.1V
V
LFB
< 0.8V (soft-start)
L1 = 10µH
V
LX
= 28V
8
0.8
3.9
1.220
200
28
285
2
14
1.2
6.0
1.270
V
mA
µA
µs
µs
V
I
LOAD
= 100µA to 20mA,
V
IN
= 3.6V to 5.5V
I
LOAD
= 200mA
I
LOAD
= 400mA
V
SDIG
= 5V, ENSD = V
IN
= GND
I
LOAD
= 100µA to 200mA,
V
IN
= 3.6V to 5.5V
0.96
250
1.755
30
I
LOAD
= 300mA
I
LOAD
= 500mA
I
LOAD
= 100µA to 200mA,
V
IN
= 3.6V to 5.5V
3.2175
420
I
LOAD
= 100µA to 300mA,
V
IN
= 3.6V to 5.5V
3.2175
3.093
3.0100
630
3.3825
3.252
3.1755
1200
310
525
3.3825
825
800
300
600
15
1.025
750
1.845
100
µA
V
mA
V
mA
mV
V
V
V
mA
mV
V
mA
Operating
V
IN
falling
V
IN
rising
V
LFB
= 1.3V
ENLCD = GND
ENLCD = ENC2 = ENSD = GND, LDO
loads = 0µA
V
SWIN
= V
IN
= 2.9V
3.1
2.95
3.51
5.5
3.05
3.69
125
110
65
10
V
V
V
µA
µA
µA
µA
CONDITIONS
MIN
MAX
UNITS
4
_______________________________________________________________________________________
5-Output Power-Management IC For
Low-Cost PDAs
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
SWIN
= V
ENSD
= V
ENC2
= V
ENLCD
= 4.0V,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
LFB Input Bias Current
SW Off-Leakage Current
LOGIC IN AND OUT
EN_ Input Low Level
EN_ Input High Level
EN_ Input Leakage Current
RS,
Output Low Level
RS,
Output High Leakage
Sinking 1mA, V
IN
= 2.5V
V
OUT
= 5.5V
V
IN
= 3.1V to 5.5V
V
IN
= 3.1V to 5.5V
1.4
1
0.4
1
0.4
V
V
µA
V
µA
V
LFB
= 1.3V
SW = GND, V
SWIN
= 5.5V, ENLCD = GND
CONDITIONS
MIN
MAX
100
1
UNITS
nA
µA
MAX1559
Note 1:
Specification is guaranteed by design, not production tested.
Note 2:
Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
MAIN DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX1559 toc01
SDIG DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX1559 toc02
MAIN OUTPUT VOLTAGE
vs. LOAD CURRENT
3.25
OUTPUT VOLTAGE (V)
3.00
2.75
2.50
2.25
2.00
MAX1559 toc03
500
300
250
DROPOUT VOLTAGE (mV)
200
150
100
50
0
3.50
DROPOUT VOLTAGE (mV)
400
300
200
100
1.75
1.50
0
50
100
150
I
LOAD
(mA)
200
250
300
0 100 200 300 400 500 600 700 800 900
I
LOAD
(mA)
0
0
100
200
300
I
LOAD
(mA)
400
500
600
_______________________________________________________________________________________
5
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