MAX1702 Evaluation MAX1702 evaluation kit) fully assembled tested

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MAX1702 Evaluation MAX1702 evaluation kit) fully assembled tested

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19-2517; Rev. 7/02
MAX1702 Evaluation
MAX1702 evaluation kit) fully assembled tested surface-mount circuit board that demonstrates MAX1702B power-management optimized microprocessor-based applications. MAX1702B integrates three high-performance step-down DC-DC power supplies with associated supervisory management functions. first power supply (VI/O) configured 3.3V provides 900mA. second power supply (VCORE) configured 1.1V provides 400mA. third power supply (VMEM) configured 1.8V, 2.5V, 3.3V provides 800mA. Power management functions include automatic power-up sequencing, power-on reset, manual reset with timer, levels low-battery detection. operates with 2.6V 5.5V input voltage range, allowing batteries regulated power supply input.
Features
Triple-Output Power Supply 3.3V VI/O Peripheral Output 1.1V VCORE Core Output 1.8V, 2.5V, 3.3V Selectable VMEM Memory Output Internal Switches 1MHz Pulse-Width Modulation (PWM) Switching Adjustable Dead/Low-Battery Settings 900mA Available from VI/O Output 800mA Available from VMEM Output 400mA Available from VCORE Output Surface-Mount Construction Fully Assembled Tested
Evaluates: MAX1702B
Ordering Information
PART MAX1702EVKIT TEMP RANGE +70°C PACKAGE (6mm
Component List
DESIGNATION DESCRIPTION 4.7µF ±20%, 6.3V ceramic capacitor (0805) C2012X5R0J475KT Taiyo Yuden JMK212BJ475MG 10µF ±10%, 6.3V ceramic capacitors (1206) C3216X5R0J106KT Taiyo Yuden JMK316BJ106KL 1000pF ±10%, ceramic capacitors (0603) C1608X7R1H102KT Taiyo Yuden UMK107CG102KZ 680pF ±10%, ceramic capacitor (0603) C1608X7R1H681KT Taiyo Yuden UMK107CG681KZ 0.1µF ±10%, ceramic capacitor (0603) C1608X7R1C104KT Taiyo Yuden EMK107BJ104KA DESIGNATION C10, C12, C11, C13, C15, DESCRIPTION installed, capacitor (1210) 1.0µF ±10%, ceramic capacitors (0603) C1608X5R1A105K installed, capacitors (0603) 33pF ±5%, ceramic capacitors (0603) C1608COG1H330JT Taiyo Yuden UMK107CG330JZ 3-pin header 4-pin header 4.7µH, 1.32A inductors Sumida CDRH4D28-4R7 4.7µH, 900mA inductor Sumida CDRH3D16-4R7NC 267k resistor (0603) 90.9k resistor (0603) 137k resistor (0603)
C18, C19,
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1702 Evaluation Evaluates: MAX1702B
Component List (continued)
DESIGNATION R9-R12 DESCRIPTION resistor (0603) 8.06k resistor (0603) resistor (0603) resistor (0603) resistor (0603) 100k resistors (0603) resistor (0603) Momentary contact switch MAX1702BEGX (36-pin QFN, 6mm) Shunts (JU1, JU2) MAX1702 board MAX1702B data sheet MAX1702 data sheet
Turn power supply verify that VI/O output 3.3V, VCORE output 1.1V, VMEM output 2.5V. voltmeter verify that LBO, OUTOK, 3.3V 1.25V.
Detailed Description
MAX1702 fully assembled tested surface-mount circuit board that demonstrates capability MAX1702B triple-output step-down DC-DC converter optimized microprocessor-based applications. MAX1702B integrates three high-performance, 1MHz switching, step-down DC-DC power supplies. These power supplies used power microprocessor, memory, peripherals single system. microprocessor VCORE supply configured 1.1V provides 400mA. memory VMEM supply configurable 1.8V, 2.5V, 3.3V provides 800mA. peripheral VI/O supply configured 3.3V provides 900mA. VPLL output filtered output from VCORE that used supply noise-sensitive circuitry such phase-lock loop. input voltage range 2.6V 5.5V requires current from source with outputs fully loaded.
Quick Start
MAX1702 fully assembled tested surface-mount board. Follow steps below board operation. turn power supply until connections completed: Verify that shunt across pins jumper (ON2). Verify that shunt across pins jumper (PGM3). Connect voltmeter across VI/O IGND monitor VI/O output voltage. Connect voltmeter across VCORE CGND monitor VCORE output voltage. Connect voltmeter across VMEM MGND monitor VMEM output voltage. Connect positive terminal 4.5V supply pad. Connect negative terminal pad.
Input Source
MAX1702 2.6V 5.5V input voltage range that allows batteries regulated power supply power source. However, requires minimum 3.6V input VI/O output supply regulate 3.3V ±2%. input voltage falls below 3.6V, VI/O tracks input voltage. VMEM configured regulate 3.3V, also tracks input voltage below 3.6V.
Input Thresholds
MAX1702B contains low-battery detection thresholds, dead battery (DBI) low-battery (LBI), that used monitor input power source kit. These thresholds programmable with external resistors. threshold 2.7V
Component Suppliers
SUPPLIER Sumida Taiyo Yuden PHONE 847-545-6700 800-348-2496 847-803-6100 847-545-6720 847-925-0899 847-390-4405 WEBSITE www.sumida.com www.t-yuden.com www.component.tdk.com
Note: Please indicate that using MAX1702 when contacting these component suppliers.
MAX1702 Evaluation Evaluates: MAX1702B
Table VMEM Output Settings (JU2)
SHUNT STATUS CONNECTION PGM3 connected PGM3 connected PGM3 connected VMEM OUTPUT connected
Table Normal/Sleep Mode (JU1)
SHUNT STATUS CONNECTION connected OPERATION Normal mode Sleep mode (VCORE disabled, VI/O VMEM remain enabled) External controller determines operation mode
threshold 3.6V with resistors input source falls below threshold, low-battery output pulled low. enters shutdown mode when input source falls below threshold. Replace resistors with different values reconfigure thresholds. Refer MAX1702B data sheet select resistor values
None
connected external controller
Power-Up Sequence
MAX1702 power-up sequence initiated when input voltage greater than dead-battery setting (DBI) greater than UVLO threshold (2.4V). During initial power-up, VI/O first ramps soft-start mode. Once VI/O reaches regulation voltage, VMEM ramps target soft-start mode. Finally, once VMEM reaches regulation voltage, VCORE ramps target soft-start mode. reset output held during this time. Once VCORE output reached target voltage, 65.5ms reset timer started. pulled high when timer expires. timer manually reset pushing momentary switch applying logic-low signal pad. outputs stay during manual reset.
data sheet instructions selecting resistors VMEM supply 800mA output voltage 3.3V, 2.5V, 1.8V configuring JU2. Table configuration. VI/O output voltage fixed 3.3V supply 900mA.
SLEEP Mode
contains 3-pin jumper (JU1) that used enable MAX1702B normal mode place sleep mode. normal operation, three converters enabled. sleep mode, VCORE shutdown while VI/O VMEM remain enabled. Sleep mode allows microprocessor enter sleep mode while memory peripherals kept alive system application. Table configuration. Normal sleep modes also controlled with external device removing shunt applying CMOS logic-level signal pad.
Triple Outputs
MAX1702 features three (VCORE, VMEM, VI/O) step-down DC-DC converters that regulate different voltages. VCORE supply 400mA output voltage 1.1V. VCORE output voltage with resistors Refer Setting Output Voltages section MAX1702B
OUTOK Output
MAX1702 provides OUTOK logic output signal indicate regulation state VCORE. logic OUTOK indicates that VCORE output dropped 92.5% regulation voltage. logic high OUTOK indicates that VCORE 95.5% regulation voltage.
MAX1702 Evaluation Evaluates: MAX1702B
OPEN 4.7µF
267k 137k
90.9k
INP1
N.C. N.C. N.C. N.C.
OUT1 N.C.
4.7µH 10µF
VI/O VI/O OPEN IGND 33pF OPEN VCORE 10µF VPLL CGND 33pF 4.7µH 10µF 680pF VMEM OPEN MGND 1000pF
100k 100k VI/O VI/O 100k 100k
VI/O OUTOK
OUTOK
MAX1702B
COMP1 INP2 N.C. 8.06k 4.7µH 10µF
N.C.
0.1µF
OPEN
COMP2 OUT3
PGM3 COMP3 33pF
N.C. INP3 N.C.
1000pF
Figure MAX1702 Schematic
MAX1702 Evaluation Evaluates: MAX1702B
Figure MAX1702 Component Placement Guide- Component Side
Figure MAX1702 Board Layout-Component Side
Figure MAX1702 Layout-Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2002 Maxim Integrated Products Printed
registered trademark Maxim Integrated Products.

MAX1702 Evaluation MAX1702 evaluation kit) fully assembled tested

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