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19-1875; Rev 0; 12/00
MAX1606 Evaluation Kit
General Description
The MAX1606 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a step-up switching converter that generates a positive voltage to drive low-power LCD displays. The circuit is configured for a +18V output voltage and provides up to 20mA. Higher output voltages are possible by selecting different components. The IC operates from a +2.4V to +5.5V supply voltage but can boost battery voltages as low as +0.8V up to +28V at the output. The IC also offers a true shutdown mode that disconnects the output from the input. Three different inductor current limits can be evaluated with the EV kit as configured.
Features
o Input Voltage +0.8V to +5.5V (VIN) +2.4V to +5.5V (VCC) o Output Voltage +18V Output Up to 20mA (as configured) o True Shutdown (output disconnected from input) o Output Voltage Adjustable with Resistors o Adjustable Inductor Current-Limit Setting o Internal MOSFET Switches o 1A (max) IC Shutdown Current o Switching Frequency Up to 500kHz o Surface-Mount Components o Fully Assembled and Tested
Evaluates: MAX1606
Component List
DESIGNATION C1 QTY 1 DESCRIPTION 10F, 6.3V, X5R ceramic cap (1206) Taiyo Yuden JMK316BJ106ML or equivalent 0.1F, 16V, X7R ceramic cap (0603) Taiyo Yuden EMK107BJ104KA or equivalent 1.0pF, 25V, X7R ceramic cap (1206) Taiyo Yuden TMK316BJ105KL or equivalent 10pF, 50V, COG ceramic cap (0603) Murata GRM39COG100D050 or Taiyo Yuden UMK107CG100DZ 1.0M 1% resistor (0805) 75k 1% resistor (0805) 0.5A schottky diode (SOD-123) Nihon EP05Q03L 10H, 1.2A inductor Sumida CDRH5D18-100 MAX1606EUA (8-pin MAX) 3-pin headers Shunts MAX1606 PC board MAX1606 data sheet MAX1606 EV kit data sheet PART MAX1606EVKIT
Ordering Information
TEMP. RANGE 0C to +70C IC PACKAGE 8 MAX
Component Suppliers
SUPPLIER Murata Nihon USA Sumida Taiyo Yuden PHONE 814-237-1431 661-867-2555 847-956-0666 408-573-4150 FAX 814-238-0409 661-867-2698 847-956-0702 408-573-4159
C2
1
C3
1
C4
1
Note: Please indicate that you are using the MAX1606 when contacting these component suppliers.
Quick Start
The MAX1606 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. Verify that shunts are across pins 1 and 2 of jumpers JU2 (SHDN) and JU1 (LIM, 500mA). 2. Connect a +0.8V to +5.5V DC power supply to the VIN pad. Connect the supply ground to the GND pad (or use the same supply and limits as in step 3) 3. Connect a +2.4V to +5.5V DC power supply to the VCC pad. Connect the supply ground to the GND pad.
R1 R2 D1 L1 U1 JU1, JU2 None None None None
1 1 1 1 1 2 2 1 1 1
________________________________________________________________ Maxim Integrated Products
1
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MAX1606 Evaluation Kit Evaluates: MAX1606
4. Turn on the VCC power supply, then the VIN power supply. Power-supply sequencing is not critical. 5. Verify that the output (VOUT) is +18V. For instructions on selecting the feedback resistors for other output voltages, see the Evaluating Other Output Voltages section.
Evaluating Other Output Voltages
Output The MAX1606 EV kit's step-up converter output (VOUT) is set to +18V by two feedback resistors (R1, R2). To generate output voltages other than +18V (VIN to +28V), select different voltage-divider resistors (R1, R2). Refer to the Setting the Output Voltage section in the MAX1606 data sheet for instructions on selecting the resistors. The output voltage (VOUT) is determined by the following equation: VOUT = VFB((R1 / R2) + 1) where VFB = 1.25V.
Detailed Description
The MAX1606 EV kit is a fully assembled and tested surface-mount circuit board that contains a step-up switching converter generating +18V used to drive lowpower LCD displays. The circuit provides up to 20mA of current to the EV kit's output. Higher output voltages up to +28V are possible by selecting different feedback resistors Power for the converter circuit can be supplied from a +0.8V to +5.5V DC source or a multiple-cell lithium-ion (Li+) battery. The IC requires a +2.4V to +5.5V DC source. The IC can also be powered from the converter's input supply if the input voltage is limited to between +2.4V and +5.5V. Three different inductor current limits can be evaluated with the EV kit--125mA, 250mA, and 500mA--by changing a jumper position. The MAX1606 EV kit demonstrates low quiescent current (18A typ).
Single-Supply Operation
VIN and VCC The MAX1606 EV kit can be operated from a single power supply. To evaluate the EV kit with a single supply, connect a jumper wire from the VIN pad to the VCC pad. Connect a +2.4V (min) to +5.5V (max) power supply to the VIN or VCC pad.
Table 1. Jumper JU2 Options
SHUNT LOCATION 1 and 2 SHDN PIN MAX1606 OUTPUT MAX1606 enabled, VOUT = +18V (as configured) Shutdown mode, VOUT = 0V
Jumper Selection
Shutdown Mode The MAX1606 EV kit features a shutdown mode that reduces MAX1606 supply current to <1A and disconnects the output from the input, thus preserving battery life and obtaining a true shutdown output voltage of 0V. The 3-pin jumper, JU2, selects the shutdown mode for the MAX1606. Table 1 lists the selectable jumper options. Inductor Current Limit The MAX1606 EV kit features options for evaluating several different inductor current limits. The 3-pin jumper, JU1, selects the inductor current limit for the MAX1606 EV kit. Table 2 lists the selectable jumper options.
Connected to VCC
2 and 3
Connected to GND
Table 2. Jumper JU1 Options
SHUNT LOCATION 1 and 2 2 and 3 None LIM PIN Connected to VCC Connected to GND Floating INDUCTOR CURRENT LIMIT (mA) 500 125 250
2
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MAX1606 Evaluation Kit Evaluates: MAX1606
VIN C1 10F VCC C2 0.1F GND
1
BATT U1 MAX1606
SW LX FB
8 5 2
L1 10H
2
D1
VOUT 1 C4 10pF R1 1M 1% R2 75k 1% VCC 1 JU2 SHDN 23 C3 1.0F
GNDO
3
VCC LIM 6
VCC 1 JU1 23
4
GND
SHDN
7
Figure 1. MAX1606 EV Kit Schematic
Actual board size is 2 3/8in 2 3/8in. Figure 2. MAX1606 EV Kit Component Placement Guide-- Component Side
Actual board size is 2 3/8in 2 3/8in. Figure 3. MAX1606 EV Kit PC Board Layout--Component Side
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3
MAX1606 Evaluation Kit Evaluates: MAX1606
Actual board size is 2 3/8in 2 3/8in. Figure 4. MAX1606 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) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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