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PDF MAX8594A Data sheet ( Hoja de datos )
| Número de pieza | MAX8594A | |
| Descripción | 5-Output PMICs with DC-DC Core Supply | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3349; Rev 2; 4/05
www.DataSheet4U.com
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.
1 page  
www.DataSheet4U.com
5-Output PMICs with DC-DC Core Supply for
Low-Cost PDAs
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
5 Page 
www.DataSheet4U.com
5-Output PMICs with DC-DC Core Supply for
Low-Cost PDAs
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN = 4V, TA = +25°C, unless otherwise noted.)
COR1 EFFICIENCY vs. LOAD CURRENT
WITH 1.3V OUTPUT
90
85
80
VIN = 5V
75
70 VIN = 4V
65 VIN = 3.6V
60
55
50
45
40
0.1
1 10 100
LOAD CURRENT (mA)
1000
VLXC
VCOR1
LIGHT-LOAD SWITCHING COR1
MAX8594/MAX8594A toc23
ILOAD = 20mA
5V/div
0
50mV/div
AC-COUPLED
COR1 EFFICIENCY vs. LOAD CURRENT
WITH 1.8V OUTPUT
100
95
90
85
80 VIN = 5V
VIN = 4V
75
70 VIN = 3.6V
65
60
55
50
0.1
1 10 100
LOAD CURRENT (mA)
1000
VLXC
VCOR1
HEAVY-LOAD SWITCHING COR1
MAX8594/MAX8594A toc24
ILOAD = 200mA
5V/div
0
50mV/div
AC-COUPLED
ILXC 200mA/div
1µs/div
ILXC 200mA/div
200ns/div
VCOR1
COR1 RESPONSE TO CV
MAX8594/MAX8594A toc25
1.3V/1.8V
500mV/div
1V/1.3V
0
VCV 2V/div
40µs/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX8594A.PDF ] | |
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