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19-1336; Rev 2; 11/98
MAX1703 Evaluation Kit
________________General Description
The MAX1703 evaluation kit (EV kit) provides a regulated 5.0V output while operating on input voltages as low as 1.2V. The input may be a DC source or a 1 to 3-cell battery. Efficiency is up to 95%, and output loads are up to 1A. The kit, which uses surface-mount components, is fully assembled and tested for quick evaluation. Jumpers are provided to select the output voltage, switching mode, and shutdown control.
____________________________Features
o 5.0V Output o 1A Output Current o 1.2V to 5.5V Input o Up to 95% Efficiency o 0.1A Shutdown Current o 300kHz PWM Operation o Optional Low-Power Mode o Small Surface-Mount Components
Evaluates: MAX1703
____________________ Component List
DESIGNATION QTY C1, C2, C3 C4 3 1 DESCRIPTION 0.22F, 25V ceramic capacitors 100F, 10V low-ESR tantalum capacitor: AVX TPSD107M010R0100 or Sprague 593D107X0010D 220F, 10V low-ESR tantalum capacitors AVX TPSE227M010R0100 or Sprague 593D227X0010E Not installed, optional user capacitor 0.5A, 20V Schottky diode Motorola MBR0520L 4.7H, 3.2A power inductor Sumida CDH74-4R7 Coilcraft DO3316-4R7, Coiltronics UP2B-4R7 or Sumida CDRH 104, 4746-JPS-007 3-pin jumpers 2-pin jumpers 100k 1% resistors Not installed, user-selected resistor 10, 5% resistor 100k, 5% resistors 1M, 5% resistors MAX1703ESE Shunts 3.40" X 2.40" printed circuit board MAX1703 data sheet SUPPLIER AVX Coilcraft Coiltronics Motorola Sprague Sumida J1, J2 J3, J4 R1, R7, R5 R2, R4, R6 R3 R8, R9 R10, R11 U1 None None None 2 2 3 0 1 2 2 1 4 1 1 PART MAX1703EVKIT
Ordering Information
TEMP. RANGE 0C to +70C PIN-PACKAGE 16 Narrow SO
C5, C6 C7 D1
2 1 1
Component Suppliers
PHONE (803) 946-0690 (847) 639-6400 (561) 241-7876 (602) 244-5303 (603) 224-1961 (847) 956-0666 FAX (803) 626-3123 (847) 639-1469 (561) 241-9339 (602) 244-4015 (603) 224-1430 (847) 956-0702
L1
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________________________________________________________________ Maxim Integrated Products
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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX1703 Evaluation Kit Evaluates: MAX1703
_________________________Quick Start
The MAX1703 EV kit is shipped fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Verify that the shunts are connected as listed in Table 2 for a 5V output. 2) Connect a 1.2V to 5.5V supply to the VIN pad. The ground connects to the GND pad. 3) Connect a voltmeter to the VOUT pad. 4) Turn on the power, and verify that the output voltage is 5V. 5) Connect a load if any. power inductor must not saturate at the 3.2A peak current produced by MAX1703. All inductors listed in the component list have high current ratings and low coil resistance. The input and output capacitors must have low equivalent-series resistance (ESR) to handle the high peak currents found in switching regulators. Low ESR is especially critical in low-voltage circuits to reduce the AC voltage across the capacitors. A higher ESR on the output capacitor will increase the output ripple. Consider using parallel capacitors to reduce the total ESR if the application requires lower output ripple. A low-ESR input capacitor must be located physically close to the inductor. A Schottky diode is used for the lower forward voltage drop as well as the fast switching characteristic. The diode selected for the evaluation board was selected for its small size. The Schottky diode must be connected between LX and POUT as close to the IC as possible. A separate low-noise ground plane connects pin 5 to the reference and signal grounds. This low-noise ground plane is then connected to the power ground plane at the two PGND pins (Figure 4).
_______________Detailed Description
Jumper Selections
Four jumpers on the printed circuit board allow user selection of several configurations. Table 1 lists the jumpers and their functions. Table 2 lists the jumper positions when the board is set for normal 5V output operation.
______________Component Selection
The final circuit performance is determined by the quality of the components surrounding the MAX1703. The
Table 1. Jumper Functions
JUMPER SHUNT POSITION 1&2 J1 2&3 Open 1&2 J2 2&3 Open Shorted J3 Open PIN CONNECTION ON connected to GND ON connected to VOUT ON is not controlled by the board. CLK/SEL pin connected to GND CLK/SEL pin connected to VOUT CLK/SEL connected to CLK/SEL pad FB pin connected to GND FB pin connected to the resistor divider VOUT connected to pull-up resistors The pull-up resistors are disconnected MAX1703 OPERATION The MAX1703 is enabled. The MAX1703 is disabled. ON must be driven by a signal connected to the ON pad. Low-power mode, the MAX1703 operates in the PFM mode. High-power mode, the MAX1703 operates in the PWM mode. CLK/SEL pin can be driven by an external source to select the power mode or a 200kHz to 400kHz signal to control the switching frequency. VOUT preset to 5V. Output voltage determined by the R4-R5 resistor divider. Note: A resistor must be installed in R4 to set the output voltage before removing the shunt. This jumper is necessary for normal circuit operation. The J4 shunt should only be removed when testing the MAX1703 shutdown current.
Shorted J4 Open
2
_______________________________________________________________________________________
MAX1703 Evaluation Kit Evaluates: MAX1703
Table 2. Jumper Position for Normal 5.0V Operation
JUMPER J1 J2 J3 J4 SHUNT POSITION 1&2 2&3 Shorted Shorted PIN CONNECTION ON pin connected to GND. CLK/SEL pin connected to VOUT. FB pin connected to GND. VOUT connected to the pull-up resistors. MAX1703 OPERATION The MAX1703 is enabled. High-power mode; the MAX1703 operates in the PWM mode. VOUT is preset to 5V. This shunt is necessary for normal circuit operation.
VIN 1.2V TO 5.3V C4 100F 10V 3 POKIN R1 100k 1% 8 1 C1 0.22F VOUT POK REF LXP 11 D1 MBR0520L 14 C5 220F 10V C6 220F 10V
R2 OPEN TO J4
L1 4.7H VOUT
POK
R9 100k
LXN
POUT
13
J4
U1
POUT
15 R3 10 C3 0.22F C2 0.22F 10V J3 C7 OPEN TO R9
MAX1703
OUT
4
R4 OPEN
R10 1M 3 ON J1 2 1 16 ON
FB
2
R5 100k 1%
R8 100k AO
AO 3 CLK/SEL J2 2 1 GND R11 1M 9 CLK/SEL GND 5 PGND 10 AIN PGND 12
7
6 R7 100k 1% R6 OPEN
AIN
Figure 1. MAX1703 EV Kit Schematic
_______________________________________________________________________________________ 3
MAX1703 Evaluation Kit Evaluates: MAX1703
1.0"
1.0"
Figure 2. MAX1703 EV Kit Component Placement Guide
Figure 3. MAX1703 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX1703EV 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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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