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19-1858; Rev 1; 9/02
MAX1709 Evaluation Kit
General Description
The MAX1709 evaluation kit (EV kit) is a step-up DC-DC switching regulator for 1- to 3-cell battery inputs as well as 2.5V or 3.3V regulated supply inputs. The EV kit accepts a positive input between 0.7V and VOUT and converts it to a higher, pin-selectable output voltage. Efficiency is up to 87% with output load currents to 4A. This EV kit operates at a fixed 600kHz PWM frequency, allowing the use of a small inductor. A movable jumper on the EV kit selects either a 3.3V or 5V output voltage. Additional pads on the board accommodate the resistors for output adjustment. This EV kit uses surface-mount components and is fully assembled and tested for quick evaluation. o 0.7V to VOUT Input Voltage Range o Pin-Selectable 3.3V or 5V Output Voltage (5V as Shipped) o Adjustable Output Voltage (2.5V to 5.5V, External Divider) o Up to 4A Output Current o 600kHz PWM Operation o Internal 10A MOSFET Switch o 4A IC Shutdown Current o Surface-Mount Components o Fully Assembled and Tested
Features
Evaluates: MAX1709
Component List
DESIGNATION QTY C1, C2 2 DESCRIPTION 150F, 6.3V low-ESR capacitors Sanyo 6TPB150M or Panasonic EEFUE0J151R 150F, 6.3V, 15m low-ESR capacitors Panasonic EEFUE0J151R Not installed 0.22F ceramic capacitor (1206) 1F, 16V ceramic capacitor (1206) Taiyo Yuden EMK316BJ105KL TDK C3216X7R1C105M 0.1F ceramic capacitors (1206) 10A Schottky diode (DPAK) Central Semiconductor CSHD10-45L ON Semiconductor (Motorola) MBRD1035CTL or STM-Microelectronics STPS8L30B 2-pin headers 1H, 10A power inductor Coilcraft DO3316P-102HC or Coiltronics UP2B-1R0 Not installed 2 5% resistor (1206) 1M 5% resistors (1206) MAX1709EUI 28-pin TSSOP-EP Shunts MAX1709 PC board MAX1709EV kit data sheet MAX1709 data sheet
Ordering Information
PART MAX1709EVKIT TEMP RANGE 0C to +70C IC PACKAGE 28-Pin TSSOP-EP*
C4, C5 C6 C7 C8 C9, C10, C12
2 0 1 1 3
*Exposed pad.
D1
1
Component Suppliers
SUPPLIER Central Semiconductor Coilcraft Coiltronics Dale- Vishay ON Semiconductor (Motorola) Panasonic Sanyo STM- Microelectronics Sumida Taiyo Yuden PHONE 516-435-1110 708-639-6400 561-241-7876 402-564-3131 602-303-5454 714-373-7939 619-661-6835 617-259-0300 847-956-0666 408-573-4150 FAX 516-435-1824 708-639-1469 561-241-9339 402-563-6418 602-994-6430 714-373-7183 619-661-1055 617-259-9442 847-956-0702 408-573-4159
JU1, JU2, JU3 L1 R1, R2, R3 R4 R5-R8 U1 None None None None
3 1 0 1 4 1 3 1 1 1
Note: Please indicate that you are using the MAX1709 when contacting these component suppliers. 1
________________________________________________________________ Maxim Integrated Products
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.
MAX1709 Evaluation Kit Evaluates: MAX1709
Quick Start Reference
The MAX1709 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed: 1) Connect a voltmeter to the VOUT pad. 2) Connect a 3V supply to the VIN pad. Connect ground to the GND pad. 3) Remove all the shunts from JU1, JU2, and JU3. Turn on the power supply and verify that the output voltage is 5V. Refer to the MAX1709 data sheet for output load during startup. 4) For other output voltages, refer to the Setting the Output Voltage section in the MAX1709 data sheet for instructions on selecting feedback resistors R1 and R2.
Detailed Description
The MAX1709 EV kit provides a pin-selectable 3.3V or 5V output from a 0.7V to VOUT input voltage. The output voltage can also be adjusted with external resistors for voltages between 2.5V and 5.5V. The MAX1709 includes an internal MOSFET switch with a typical peak current limit of 10A and can deliver loads up to 4A. Connecting an external resistor from SS/LIM to GND (R3) can also reduce the current limit. Connecting a capacitor from SS/LIM to GND (C10) sets the soft-start rate. The EV kit operates at a 600kHz switching frequency and allows the use of a small inductor value. The switching frequency can also be synchronized to an external clock ranging from 350kHz to 1MHz.
Jumper Selection
Three jumpers on the PC board allow user selection of several configurations. Table 1 lists the jumpers and their functions.
Table 1. Jumper Functions
JUMPER JU1 JU2 SHUNT LOCATION Not installed Installed Not installed Installed Not installed JU3 PIN CONNECTION ONB connected to GND ONB connected to VOUT ONA connected to GND ONA connected to VOUT 3.3/5 connected to VOUT 3.3/5 connected to GND Installed 3.3/5 connected to GND and resistors R1, R2 are installed MAX1709 OPERATION MAX1709 is enabled if ONA = VOUT. MAX1709 is disabled if ONA = GND. MAX1709 is disabled if ONB = VOUT. MAX1709 is enabled if ONB = GND. VOUT is set to 5V. FB pin must be connected to ground (R2 = short). VOUT is set to 3.3V. FB pin must be connected to ground (R2 = short). VOUT = adjustable between 2.5V to 5.5V. Refer to the Setting the Output Voltage section in the MAX1709 data sheet for instructions on selecting feedback resistors R1 and R2. Also cut PC trace shorting R2.
2
_______________________________________________________________________________________
VIN VOUT L1 1H JU1 16 ONB LX3 LX2 LX2 1 ONA LX1 3 2 23 22 21 20 19 18 15 17 C9 0.1F R4 2 R6 1M LX1 PGND3 27 CLK/SEL PGND3 PGND2 PGND2 6 SS/LIM PGND1 OUT NC 13 REF FB 11 GND NC 3.3/5 26 1 JU3 GND 25 14 NC 24 R8 1M VOUT 2 16 C7 0.22F NC NC C10 0.1F 9 10 PGND1 LX1 4 C4 150F 6.3V C5 150F 6.3V C6 OPEN C8 1F 16V 5 C12 0.1F 6 D1 VOUT 5V AT 4A 7 LX3 R5 1M 8 GND C1 150F 6.3V C2 150F 6.3V
Figure 1. MAX1709 EV Kit Schematic
U1 MAX1709
R1 OPEN R2 SHORT (PC TRACE)
GND
ONB
VOUT
JU2
ONA
VOUT
R7 1M
CLK
R3 OPEN
Evaluates: MAX1709
_______________________________________________________________________________________
REF 1.25V
MAX1709 Evaluation Kit
3
MAX1709 Evaluation Kit Evaluates: MAX1709
1.0"
1.0"
Figure 2. MAX1709 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1709 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX1709 EV Kit PC Board Layout--Solder Side
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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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