MAX8594ETG+T Maxim Integrated Products, MAX8594ETG+T Datasheet

IC PMIC W/DC-DC SUP 24-TQFN

MAX8594ETG+T

Manufacturer Part Number
MAX8594ETG+T
Description
IC PMIC W/DC-DC SUP 24-TQFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8594ETG+T

Applications
Handheld/Mobile Devices
Voltage - Supply
3.1 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Supply
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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.
19-3349; Rev 2; 4/05
*EP = Exposed pad.
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.
MAX8594ETG
MAX8594AETG -40°C to +85°C
PART
PDAs
Organizers
Cellular and Cordless Phones
MP3 Players
Handheld Devices
5-Output PMICs with DC-DC Core Supply for
-40°C to +85°C
TEMP RANGE PIN-PACKAGE
________________________________________________________________ Maxim Integrated Products
Ordering Information
General Description
24 Thi n QFN - E P * 4m m x 4m m
( T2444- 4)
24 Thi n QFN - E P * 4m m x 4m m
( T2444- 4)
Applications
♦ Minimum External Components
♦ Efficient Step-Down DC-DC Powers CPU Core
♦ 1V/1.3V Selectable Core Voltage, 400mA
♦ 1.3V/1.8V Selectable Core Voltage, 400mA
♦ 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
Pin Configuration appears at end of the data sheet.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
TO MAIN
TO MAIN
TO MAIN
MAIN
COR2
COR1
1.3V/1V
(MAX8594)
(MAX8594A)
SDIG
LCD
1.8V/1.3V
V
IN
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
IN
ENM
ENSD
ENC2
ENC1
ENL
LBO
DBO
LBI
DBI
CV
RS
Typical Operating Circuit
MAX8594A
MAX8594
Low-Cost PDAs
PGND
COR2
COR1
MAIN
SDIG
GND
LXC
LXL
LFB
REF
SW
PV
3.3V, 500mA
MAIN
3.3V, 500mA
SD CARD SLOT
1.8V, 50mA
COR2
TO IN
Features
1.3V OR 1.8V (MAX8594A)
1V OR 1.3V (MAX8594)
400mA
COR1
LCD
15V
1

Related parts for MAX8594ETG+T

MAX8594ETG+T Summary of contents

Page 1

... COR1 ON OFF Applications 1.8V/1.3V 1.3V/1V LCD ON OFF TO MAIN TO MAIN TO MAIN Pin Configuration appears at end of the data sheet. True Shutdown is a trademark of Maxim Integrated Products, Inc. Low-Cost PDAs Features Typical Operating Circuit MAX8594 MAX8594A 3.3V, 500mA MAIN MAIN IN LBI 3.3V, 500mA SDIG ...

Page 2

... All off (REF on) All on; LXL, LXC not switching Main on, no load IN Operating Current Main on, no load, COR1 on, LXC not switching excep Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 _______________________________________________________________________________________ Current into LXC .........................................................400mA Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (T 24-Pin Thin QFN Package (derate 20.8mW/° ...

Page 3

PMICs with DC-DC Core Supply for ELECTRICAL CHARACTERISTICS (continued ENSD ENC2 ENL Typical values are +25°C.) A PARAMETER LDOs MAIN, SDIG Soft-Start Time MAIN Output ...

Page 4

PMICs with DC-DC Core Supply for Low-Cost PDAs ELECTRICAL CHARACTERISTICS (continued ENSD ENC2 ENL Typical values are +25°C.) A PARAMETER CV = low ...

Page 5

PMICs with DC-DC Core Supply for ELECTRICAL CHARACTERISTICS ( ENSD ENC2 ENL PARAMETER GENERAL IN, PV Voltage Range V V Complete Shutdown DBI IN Threshold V DBI ...

Page 6

PMICs with DC-DC Core Supply for Low-Cost PDAs ELECTRICAL CHARACTERISTICS (continued ENSD ENC2 ENL PARAMETER SDIG Output Voltage I LOAD SDIG Current Limit I LOAD SDIG ...

Page 7

PMICs with DC-DC Core Supply for ELECTRICAL CHARACTERISTICS (continued ENSD ENC2 ENL PARAMETER LOGIC EN_, CV Input Low Level V IN EN_, CV Input High Level ...

Page 8

PMICs with DC-DC Core Supply for Low-Cost PDAs (Circuit of Figure 4V +25°C, unless otherwise noted SDIG OUTPUT VOLTAGE vs. LOAD CURRENT 3.50 3.25 3.00 2.75 2.50 2.25 2.00 1.75 1.50 0 ...

Page 9

PMICs with DC-DC Core Supply for (Circuit of Figure 4V +25°C, unless otherwise noted AND OUTPUT TIMING MAX8594/MAX8594A toc10 MAIN COR1 20ms/div LCD OUTPUT VOLTAGE ...

Page 10

PMICs with DC-DC Core Supply for Low-Cost PDAs (Circuit of Figure 4V +25°C, unless otherwise noted LCD RESPONSE TO ENL V ENL LCD BOOST SOFT-START SW TURN-ON V LCD 400µs/div COR1 RESPONSE ...

Page 11

PMICs with DC-DC Core Supply for (Circuit of Figure 4V +25°C, unless otherwise noted COR1 EFFICIENCY vs. LOAD CURRENT WITH 1.3V OUTPUT ...

Page 12

PMICs with DC-DC Core Supply for Low-Cost PDAs PIN NAME 3.3V, 500mA LDO Output for Secure-Digital Card Slot. SDIG has reverse current protection so SDIG can be biased when no power is present at IN. SDIG output turns off ...

Page 13

PMICs with DC-DC Core Supply for PIN NAME LCD True-Shutdown Switch Output the power source for the LCD boost inductor. SW turns when ENL is high. For best efficiency, bypass SW with a 4.7µF ...

Page 14

PMICs with DC-DC Core Supply for Low-Cost PDAs MAX8601 AC ADAPTER INPUT DC 4.15V TO 7V 1µF USB INPUT USB 4.15V TO 6V 1µF CHARGE EN CONTROL 500mA 100mA USEL LOGIC ISEL Figure 1. Typical Application Circuit with Charger ...

Page 15

PMICs with DC-DC Core Supply for POWER INPUT C1 1µF ON OFF ON OFF ON OFF ON OFF 1.8V/1.3V 1.3V/1V LCD ON OFF TO MAIN R8 1MΩ TO MAIN R7 1MΩ TO MAIN R6 1MΩ Figure 2. Block Diagram ...

Page 16

... PWM control signal using external components. SW provides an input-power disconnect for the LCD when ENL is low (off). The input-power disconnect Idle Mode is a trademark of Maxim Integrated Products, Inc. 16 ______________________________________________________________________________________ function is ideal for applications that require the output voltage to fall shutdown (True Shutdown) ...

Page 17

PMICs with DC-DC Core Supply for Power Sequencing As V increases from 0V, sequencing is as follows: IN The DBI comparator is always on. DBO, LBO, and 1) RS are pulled low at approximately V MAIN, SDIG, COR1, COR2, ...

Page 18

PMICs with DC-DC Core Supply for Low-Cost PDAs IN DBI (1.25V FALLING, 1.375V RISING) LBI (1.125V FALLING, 1.25V RISING) MAX8594 MAX8594A Figure 4. Setting the DBI and LBI Threshold with Three External Resistors In Figure 4, one three-resistor-divider can ...

Page 19

PMICs with DC-DC Core Supply for MAX5365 DOUT DAC Figure 6. Adjusting the Output Voltage with a DAC and LBO are automatically driven low and the part is shut down when the DBI threshold is crossed ...

Page 20

PMICs with DC-DC Core Supply for Low-Cost PDAs Using PWM Signals Many µPs have the ability to create PWM outputs. These are digital outputs, based on either 16-bit or 8-bit counters, with a programmable duty cycle. In many applications, ...

Page 21

PMICs with DC-DC Core Supply for Chip Information TRANSISTOR COUNT: 3436 PROCESS: BiCMOS ______________________________________________________________________________________ Low-Cost PDAs Pin Configuration TOP VIEW ENC1 ENSD 20 21 COR1 MAX8594 ENC2 22 MAX8594A 23 COR2 MAIN ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0 ...

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