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MAX1626 Evaluation Kit
_______________General Description
The MAX1626 evaluation kit (EV kit) provides a selectable 3.3V or 5V output voltage. The MAX1626 has a high-switch duty cycle of up to 100%, allowing the external P-channel transistor to turn on fully. The 100% duty cycle and a low 100mV current-sense level permit very low dropout voltages. The circuit is configured to deliver up to 2A of output current with greater than 90% conversion efficiency. This EV kit is a fully assembled and tested surfacemount circuit board. It can also be used to evaluate the MAX1627, which has an adjustable output voltage. Additional pads on the bottom of the board accommodate the external feedback resistors for setting different output voltages.
____________________________Features
o Selectable 3.3V or 5V Output Voltage o Low Dropout Voltage o 100% Max Duty Cycle o 2A Output Current o 16.5V Max Input Voltage o 1A Max Shutdown Current o 90A Max IC Supply Current o Up to 300kHz Switching Frequency o 8-Pin SO, Surface-Mount Construction o Fully Assembled and Tested
Evaluates: MAX1626/MAX1627
____________________Component List
DESIGNATION QTY C1, C2 2 DESCRIPTION 68F, 20V tantalum capacitors AVX TPSE686M020R0150 or Sprague 593D686X0020E2W 220F, 10V tantalum capacitor AVX TPSE227M010R0100 or Sprague 593D227X0010E2W 0.47F ceramic capacitor 0.1F ceramic capacitor Open Schottky diode Nihon NSQ03A03 or Motorola MBRS340T3 22H inductor Sumida CDRH125-220 or Coilcraft DO3316P-223 P-channel MOSFET International Rectifier IRF7416, Siliconix Si4431DY, or Motorola MMSF3P02HD 0.040, 1%, 1/2W resistor Dale WSL-2010-R040-F or IRC LR2010-01-R040-F Open MAX1626ESA Three-pin headers Shunts MAX1626 PC board MAX1626 data sheet
_______________Ordering Information
PART MAX1626EVKIT-SO TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
Note: To evaluate the MAX1627, request a MAX1627ESA free sample with the MAX1626EVKIT-SO.
C3 C4 C5 C6, C7 D1
1 1 1 0 1
______________Component Suppliers
SUPPLIER AVX Coilcraft Dale-Vishay International Rectifier IRC Motorola Nihon Siliconix Sprague Sumida PHONE (803) 946-0690 (800) 282-4975 (847) 639-6400 (402) 564-3131 (310) 322-3331 (512) 992-7900 (602) 303-5454 (805) 867-2555 (408) 988-8000 (800) 554-5565 (603) 224-1961 (847) 956-0666 FAX (803) 626-3123 (847) 639-1469 (402) 563-6418 (310) 322-3332 (512) 992-3377 (602) 994-6430 (805) 867-2698 (408) 970-3950 (603) 224-1430 (847) 956-0702
L1
1
P1
1
R1 R2, R3 U1 JU1, JU2 None None None
1 0 1 2 2 1 1
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX1626 Evaluation Kit Evaluates: MAX1626/MAX1627
_________________________Quick Start
The MAX1626 EV kit is a fully assembled and tested surface-mount printed circuit board. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Connect a 5.5V supply to the VIN pad. The ground connects to the GND pad. 2) Connect a voltmeter and load, if any, to the VOUT pad. 3) For normal operation, place the shunts on JU1 across pins 1 and 2, and place the shunts on JU2 across pins 2 and 3. 4) Turn on the power and verify that the output voltage is 5V. For a 3.3V output, remove the shunt from JU2 pins 2 and 3, and place it across JU2 pins 1 and 2. 5) Refer to the Evaluating Other Output Voltages section to modify the board for different output voltages.
Inductor Selection
The 22H Sumida CDRH125-220 inductor mounted on the EV kit board is a low-resistance, shielded, mediumcurrent inductor. It provides excellent performance over the line and load ranges. Refer to the Inductor Selection section in the MAX1626/MAX1627 data sheet for instructions on selecting the inductor value.
Evaluating Other Output Voltages
To generate output voltages other than 3.3V or 5V, replace the MAX1626 with the MAX1627 (adjustable output), and select the external voltage divider resistors R2 and R3 (located on the bottom side of the board). The only other modifications required are cutting the trace across JU3 and removing the shunt from JU2. Refer to the Setting the Output Voltage section in the MAX1626/MAX1627 data sheet for instructions on calculating R2 and R3 values.
_______________Detailed Description
Jumper Selection
The three-pin header JU1 selects shutdown mode. Table 1 lists the selectable jumper options. The three-pin header JU2 selects the output voltage mode. Table 2 lists the selectable jumper options.
Table 1. Jumper JU1 Functions
SHUNT LOCATION 2&3 1&2 SHDN PIN Connected to VIN Connected to GND MAX1626 OUTPUT Shutdown mode, VOUT = 0V MAX1626 enabled, VOUT = 5.0V
Table 2. Jumper JU2 Functions
SHUNT LOCATION 2&3 1&2 FB PIN Connected to VIN Connected to GND MAX1626 OUTPUT VOUT = 5V VOUT = 3.3V
2
_______________________________________________________________________________________
MAX1626 Evaluation Kit Evaluates: MAX1626/MAX1627
C1 68F 20V VIN
C2 68F 20V 2 3 1 P1 5 67 1 2 32 VIN JU2 R3 OPEN JU3 CUT HERE 8
R1 0.04
C4 0.47F
5 3
V+ SHDN REF
CS 6 EXT 7
4
L1 22H VOUT D1 C3 220F 10V C7 OPEN
SHDN
2
3 1 JU1 4
U1 MAX1626
OUT C5 0.1F GND 8 3/5
R2 OPEN
1
C6 OPEN
Figure 1. MAX1626 EV Kit Schematic
_______________________________________________________________________________________
3
MAX1626 Evaluation Kit Evaluates: MAX1626/MAX1627
Figure 2. MAX1626 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1626 EV Kit Component Placement Guide-- Solder Side
Figure 4. MAX1626 EV Kit PC Board Layout--Component Side
Figure 5. MAX1626 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) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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