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19-3349; Rev 2; 4/05
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5-Output PMICs with DC-DC Core Supply for
Low-Cost PDAs
General Description
The MAX8594/MAX8594A complete power-manage-
ment chips for low-cost personal digital assistants
(PDAs) operates from a 1-cell lithium-ion (Li+) or 3-cell
NiMH battery. They include all regulators, outputs, and
voltage monitors necessary for small portable devices
while requiring a bare minimum of external compo-
nents. Featured are three linear regulators, a boost DC-
DC converter for LCD bias, an efficient 4MHz buck
DC-DC converter for core power, a microprocessor
(µP) reset output, and low-battery shutdown in a 0.8mm
high thin QFN package.
The COR1 buck DC-DC converter supplies a pin-selec-
table output at 400mA. All linear regulators feature
PMOS pass elements for efficient low-dropout opera-
tion. A MAIN LDO supplies 3.3V at 500mA. A secure-
digital (SD) card slot output supplies 3.3V at 500mA,
and a COR2 LDO supplies 1.8V at 50mA. Each output
has its own logic-controlled enable. For other output
voltage combinations, contact Maxim.
An LCD bias boost DC-DC converter features an on-
board MOSFET and True Shutdown™ when off. This
means that during shutdown, input power is disconnect-
ed from the inductor so the boost output falls to 0V rather
than remaining one diode drop below the input voltage.
A µP reset output clears 20ms (typ) after the COR1 out-
put achieves regulation to ensure an orderly start. In
addition, the COR1 regulator is not started until the 3.3V
main output is in regulation. Also included are a 1%
accurate reference and low-battery monitor. Thermal
shutdown protects the die from overheating.
The MAX8594/MAX8594A operate from a 3.1V to a 5.5V
supply voltage and consume 46µA no-load supply cur-
rent. They are packaged in a tiny, 4mm x 4mm, 24-pin
thin QFN capable of dissipating 1.67W. The devices
are specified for operation from -40°C to +85°C.
Applications
PDAs
Organizers
Cellular and Cordless Phones
MP3 Players
Handheld Devices
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8594ETG
-40°C to +85°C
24 Thin QFN-EP* 4mm x 4mm
(T2444-4)
Features
Minimum External Components
Efficient Step-Down DC-DC Powers CPU Core
1V/1.3V Selectable Core Voltage, 400mA
(MAX8594)
1.3V/1.8V Selectable Core Voltage, 400mA
(MAX8594A)
Main LDO 3.3V, 500mA
SD Card Output 3.3V, 500mA
Second Core LDO 1.8V, 50mA
High-Efficiency LCD Boost
LCD 0V True Shutdown when Off
46µA Quiescent Current
Typical Operating Circuit
VIN
MAIN
ON
OFF
SDIG
ON
OFF
COR2 ON
OFF
COR1 ON
OFF
1.8V/1.3V
1.3V/1V
LCD ON
OFF
TO MAIN
TO MAIN
TO MAIN
MAX8594
MAX8594A
MAIN
IN
LBI
SDIG
DBI
COR2
ENM
ENSD
PV
ENC2
ENC1
CV
ENL
RS
LBO
LXC
PGND
COR1
SW
LXL
LFB
GND
REF
DBO
3.3V, 500mA
MAIN
3.3V, 500mA
SD CARD SLOT
1.8V, 50mA
COR2
TO IN
1.3V OR 1.8V (MAX8594A)
1V OR 1.3V (MAX8594)
400mA
COR1
LCD
15V
MAX8594AETG
-40°C to +85°C
24 Thin QFN-EP* 4mm x 4mm
(T2444-4)
*EP = Exposed pad.
Pin Configuration appears at end of the data sheet.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.

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5-Output PMICs with DC-DC Core Supply for
Low-Cost PDAs
ABSOLUTE MAXIMUM RATINGS
IN, PV, ENSD, ENC1, ENC2, ENL, RS, SDIG,
LBI, DBI to GND ...................................................-0.3V to +6V
Current into LXC .........................................................400mARMS
Output Short-Circuit Duration.....................................Continuous
LXL to GND ............................................................-0.3V to +30V
MAIN, COR1, COR2, REF, LFB, CV, ENM, LBO, DBO,
Continuous Power Dissipation (TA = +70°C)
24-Pin Thin QFN Package
LXC, SW to GND......................................-0.3V to (VIN + 0.3V)
PV to IN..................................................................-0.3V to +0.3V
(derate 20.8mW/°C above +70°C) .................................1.67W
Operating Temperature Range ...........................-40°C to +85°C
PGND to GND .......................................................-0.3V to +0.3V
Junction Temperature ......................................................+150°C
Current into LXL..........................................................300mARMS
Current out of SW .......................................................300mARMS
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
(VIN = VPV = VENSD = VENC2 = VENL = VENM = VENC1 = VDBI = VLBI = VCV = 4.0V, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
GENERAL
IN, PV Voltage Range
3.1 5.5 V
VIN Complete Shutdown
Threshold
VDBI = VIN, VIN falling
VDBI = VIN, VIN rising
2.950 3.0 3.050
3.135 3.3 3.525
V
VDBI Complete Shutdown
Threshold
VLBI LBO Threshold
VDBI falling
VDBI rising
VLBI rising
VLBI falling
1.234
1.306
1.234
1.103
1.25
1.375
1.25
1.125
1.263
1.478
1.263
1.140
V
V
VIN LBO Threshold
VLBI = VIN, VIN falling
VLBI = VIN, VIN rising
3.262 3.33 3.366
3.625 3.7 3.744
V
DBI Input Dual ModeThreshold
Preset mode, VIN = 2.9V
ADJ mode, VIN = 2.9V
VIN -
0.3
VIN -
1.2
V
LBI Input Dual-Mode Threshold
with Respect to IN
Preset mode, VIN = 3.2V
ADJ mode, VIN = 3.2V
VIN -
0.3
VIN -
1.2
V
DBI Complete Shutdown Input
Program Range
VIN falling
3.0 5.5 V
DBI Input Bias Current
LBI Input Bias Current
VDBI = 1.25V
VLBI = 1.25V
-50
-50
IN, PV Operating Current
Shutdown (DBI remains on, REF off), VIN = VPV = VDBI =
VLBI = 2.7V
All off (REF on)
2
30
All on; LXL, LXC not switching
130
Main on, no load
46
IN Operating Current
Main on, no load, COR1 on, LXC not switching
80
All on except LCD, VENL = 0V, LXL and LXC not switching
115
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2 _______________________________________________________________________________________
+50
+50
10
55
180
75
110
160
nA
nA
µA
µA

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5-Output PMICs with DC-DC Core Supply for
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ELECTRICAL CHARACTERISTICS (continued)
(VIN = VPV = VENSD = VENC2 = VENL = VENM = VENC1 = VDBI = VLBI = VCV = 4.0V, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
LDOs
MAIN, SDIG Soft-Start Time
MAIN Output Voltage
MAIN Current Limit
MAIN Dropout Voltage
SDIG Output Voltage
SDIG Current Limit
SDIG Dropout Voltage
SDIG Reverse Leakage Current
COR2 Output Voltage
COR2 Current Limit
COR1 PWM BUCK
COR1 Output Voltage Accuracy
p-Channel On-Resistance
n-Channel On-Resistance
p-Channel Current-Limit
Threshold
CONDITIONS
ILOAD = 100µA to 300mA, VIN = 3.6V to 5.5V
ILOAD = 1mA
ILOAD = 300mA
ILOAD = 500mA
ILOAD = 100µA to 200mA, VIN = 3.6V to 5.5V
ILOAD = 1mA
ILOAD = 200mA
ILOAD = 500mA
VSDIG = 5.5V, VENSD = VIN = 0V
ILOAD = 100µA to 50mA, VIN = 3.6V to 5.5V
CV = high (MAX8594A)
CV = high (MAX8594) or CV = low (MAX8594A)
CV = low (MAX8594)
ILXC = -180mA
ILXC = -180mA, VPV = 3.1V
ILXC = 180mA
ILXC = 180mA, VPV = 3.1V
MIN TYP MAX UNITS
300
3.218
550
3.218
525
1.755
65
600
3.3
800
1
210
350
3.3
718
0.75
170
525
7
1.8
98
1200
3.383
1200
330
595
3.383
900
300
1010
15
1.845
150
µs
V
mA
mV
V
mA
mV
µA
V
mA
1.743
1.259
0.972
1.8
1.3
1
0.70
0.8
0.25
0.30
1.855
1.340
1.023
1.34
1.58
0.46
0.53
-0.500 -0.75 -0.925
V
A
n-Channel Current-Limit
Threshold
Minimum On- and Off-Times
LXC Leakage Current
REF AND RESET OUTPUT
REF Voltage Accuracy
REF Line Regulation
REF Load Regulation
RS Deassert Threshold for COR1
Rising (Note 1)
tON(MIN)
tOFF(MIN)
VLXC = 0V, VENC1 = 0V
IREF = 0.1µA
3.1V < VIN < 5.5V, IREF = 0.1µA
0.1µA < IREF < 10µA
CV = low (MAX8594A),
CV = low or CV = high (MAX8594)
CV = high (MAX8594A)
-0.50
-10
-0.72
0.1
0.1
+0.1
-0.92
+10
A
µs
µA
1.236
88.00
67.0
1.25
0.1
1
90
69
1.264
3
3
93.25
72.7
V
mV
mV
%
_______________________________________________________________________________________ 3

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ELECTRICAL CHARACTERISTICS (continued)
(VIN = VPV = VENSD = VENC2 = VENL = VENM = VENC1 = VDBI = VLBI = VCV = 4.0V, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RS Assert Threshold
CV = low or CV = high (MAX8594),
CV = low (MAX8594A)
CV = high (MAX8594A)
80
%
62.5
RS Deassert Delay
10 20 30 ms
RS Assert Delay
50mV overdrive
5 µs
LCD
LXL Voltage Range
28 V
LXL Current Limit
L1 = 10µH
195 235 275
mA
LXL On-Resistance
LXL Leakage Current
Maximum LXL On-Time
VLXL = 28V
1.7
0.2 2
234
µA
µs
Minimum LXL Off-Time
LFB Feedback Threshold
VLFB > 1.1V
VLFB < 0.8V (soft-start)
0.8 1 1.2
3.9 5 6.0
1.229 1.25 1.270
µs
V
LFB Input Bias Current
SW Off-Leakage Current
SW PMOS On-Resistance
VLFB = 1.3V
VSW = 0V, VPV = 5.5V, VENL = 0V
5 50
0.01 1
1 1.5
nA
µA
SW PMOS Peak Current Limit
700 mA
SW PMOS Average Current Limit
300 mA
Soft-Start Time
LOGIC
CSW = 1µF
0.13 ms
EN_, CV Input Low Level
EN_, CV Input High Level
EN_, CV Input Leakage Current
RS, LBO, DBO Output Low Level
DBO Output Low Level
RS, LBO, DBO Output High
Leakage
VIN = 3.1V to 5.5V
VIN = 3.1V to 5.5V
Sinking 1mA, VIN = 2.5V
Sinking 100µA, VIN = 1.0V
VOUT = 5.5V, VIN = 5.5V
0.35
1.4
0.01 1
0.02 0.1
0.02 0.1
1
V
V
µA
V
V
µA
THERMAL PROTECTION
Thermal-Shutdown Temperature Rising temperature
+160
°C
Thermal-Shutdown Hysteresis
15 °C
4 _______________________________________________________________________________________

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5-Output PMICs with DC-DC Core Supply for
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ELECTRICAL CHARACTERISTICS
(VIN = VPV = VENSD = VENC2 = VENL = VENM = VENC1 = VDBI = VLBI = 4.0V, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
GENERAL
IN, PV Voltage Range
VIN Complete Shutdown
Threshold
VDBI Complete Shutdown
Threshold
VLBI LBO Threshold
VIN LBO Threshold
DBI Input Dual-Mode Threshold
LBI Input Dual-Mode Threshold
with Respect to IN
DBI Complete Shutdown Input
Program Range
DBI Input Bias Current
LBI Input Bias Current
IN, PV Operating Current
IN Operating Current
LDOs
MAIN, SDIG Soft-Start Time
MAIN Output Voltage
MAIN Current Limit
MAIN Dropout Voltage
CONDITIONS
VDBI = VIN, VIN falling
VDBI = VIN, VIN rising
VDBI falling
VDBI rising
VLBI rising
VLBI falling
VLBI = VIN, VIN falling
VLBI = VIN, VIN rising
Preset mode, VIN = 2.9V
ADJ mode, VIN = 2.9V
Preset mode, VIN = 3.2V
ADJ mode, VIN = 3.2V
VIN falling
VDBI = 1.25V
VLBI = 1.25V
Shutdown (DBI remains on, REF off), VIN = VPV = VDBI =
VLBI = 2.7V
All off (REF on)
All on, LXL, LXC not switching
Main on, no load
Main on, no load, COR1 on, LXC not switching
All on except LCD, VENL = 0V, LXL and LXC not
switching
Ramp ILIM from 0% to 100%
ILOAD = 100µA to 300mA, VIN = 3.6V to 5.5V
ILOAD = 300mA
ILOAD = 500mA
MIN
3.1
2.93
3.135
1.228
1.306
1.228
1.103
3.248
3.609
VIN -
0.3
VIN -
0.3
3.0
-50
-50
300
3.209
550
TYP
MAX UNITS
5.5
3.06
3.525
1.264
1.478
1.264
1.140
3.366
3.744
V
V
V
V
V
VIN -
1.25
V
VIN -
1.25
5.5
+50
+50
10
55
180
75
110
160
V
V
nA
nA
µA
µA
1200
3.383
1230
330
595
µs
V
mA
mV
_______________________________________________________________________________________ 5