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19-1357; Rev 1; 7/98
MAX1653 Evaluation Kit
General Description
The MAX1653 evaluation kit (EV kit) provides a +3.3V output voltage from a +4.5V to +28V input. It delivers up to 2A output current with greater than 95% efficiency, operates at 300kHz switching frequency, and has superior line- and load-transient response. This EV kit can be used to evaluate other output voltages in the +2.5V to +5.5V range by changing feedback resistors R2 and R3. It can also be used to evaluate the MAX1655, which has a +1.0V to +5.5V output voltage range. o +4.5V to +28V Input Voltage Range o Selectable +3.3V or +5V Output Voltage o +2.5V to +5.5V Adjustable Output (MAX1653) +1.0V to +5.5V Adjustable Output (MAX1655) o 2A Output Current o 3A IC Shutdown Current o 300kHz Switching Frequency o Surface-Mount Construction o Fully Assembled and Tested
Features
Evaluates: MAX1653/MAX1655
Component List
DESIGNATION QTY C1 C2, C4 C3 C5 C6 C7 1 1 1 1 1 1 DESCRIPTION 22F, 35V, low-ESR tantalum capacitor AVX TPSE226M035R0300 or Sprague 593D226X0035E2W 0.1F ceramic capacitor 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2T 0.33F ceramic capacitor 0.01F ceramic capacitor 220F, 10V, low-ESR tantalum capacitor AVX TPSE227M010R0100 or Sprague 594D227X0010D2T 100mA, 30V Schottky diode Central Semiconductor CMPSH-3 0.5A, 30V Schottky diode Motorola MBR0530 15H inductor Sumida CDRH104-150, or Coiltronics UP2B-150, or Coilcraft D03316P-153 Dual, 30V, N-channel MOSFET International Rectifier IRF 7303 or Fairchild NDS8936 0.033, 1%, 1/2W resistor (2010) Dale WSL-2010-R033-F or IRC LR2010-R033-F Not installed 100k, 1% resistor MAX1653EEE 3-pin headers Shunts MAX1653 PC board MAX1652-MAX1655 data sheet SUPPLIER AVX Central Semiconductor Coilcraft Coiltronics Dale-Vishay Fairchild International Rectifier IRC Motorola Sprague Sumida Taiyo Yuden Vishay/Vitramon PART MAX1653EVKIT
Ordering Information
TEMP. RANGE 0C to +70C PIN-PACKAGE 16 QSOP
Note: To evaluate the MAX1655, request a MAX1655EEE free sample when ordering the MAX1653EVKIT.
Component Suppliers
PHONE 803-946-0690 516-435-1110 708-639-6400 561-241-7876 402-564-3131 408-822-2000 310-322-3331 512-992-7900 602-303-5454 603-224-1961 708-956-0666 408-573-4150 203-268-6261 FAX 803-626-3123 516-435-1824 708-639-1469 561-241-9339 402-563-6418 408-822-2102 310-322-3332 512-992-3377 602-994-6430 603-224-1430 708-956-0702 408-573-4159 203-452-5670
D1 D2
1 1
L1
1
N1
1
R1 R2 R3 U1 JU1-JU4 None None None
1 0 1 1 4 4 1 1
Note: Please indicate that you are using the MAX1653 when contacting these component suppliers.
Quick Start
The MAX1653V 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 +4.5V to +28V supply voltage to the VIN pad. Connect ground to the GND pad.
1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468.
MAX1653 Evaluation Kit Evaluates: MAX1653/MAX1655
2) Connect a voltmeter and load, if any, to the VOUT pad. 3) Verify that the shunts are across JU1 pins 2 and 3, JU2 pins 1 and 2, JU3 pins 1 and 2, and JU4 pins 2 and 3. 4) Turn on the power supply to the board. Verify that the output voltage is +3.3V. For a +5V output, remove the shunt from JU3 pins 1 and 2 and place it across JU3 pins 2 and 3. 5) Refer to the Evaluating Other Output Voltages section to modify the board for different output voltages. For high-input-voltage and low-output-voltage combinations, you may need to operate at 150kHz with appropriate component changes (see the Duty-Factor Limitation section in the MAX1652-MAX1655 data sheet).
Table 1. Jumper JU1 (Shutdown)
SHUNT LOCATION 1 and 2 2 and 3 SHDN PIN Connected to GND Connected to VIN MAX1653 OUTPUT Shutdown mode, VOUT = 0V MAX1653 enabled, VOUT = +3.3V or +5V
_______________Detailed Description
The MAX1653 provides a +3.3V output from a +4.5V to +28V input voltage. It delivers up to 2A output current and operates at 300kHz. Other output voltages can be programmed by feedback resistors R2 and R3. The MAX1653 EV kit uses a two-layer PC board optimized for compact design and best performance. Refer to the Board Layout Considerations section in the MAX1652- MAX1655 data sheet. The EV kit's components are selected for 300kHz operation. To operate at other frequencies, component values might need to be changed (refer to the Design Procedure section in the MAX1652-MAX1655 data sheet). The oscillator can be synchronized to an external clock signal by driving the SYNC pad with a pulse train of 5V amplitude in the 190kHz to 340kHz frequency range. The 3-pin header JU4 selects either 150kHz or 300kHz switching frequency. Table 4 lists the selectable jumper options.
Table 2. Jumper JU2 (Skip Mode)
SHUNT LOCATION SKIP PIN MODE OF OPERATION Idle mode, pulse-skipping operation for highest light-load efficiency Low-noise mode, fixed 300kHz frequency PWM operation
1 and 2
Connected to GND
2 and 3
Connected to VL
Table 3. Jumper JU3 (Output Voltage)
SHUNT LOCATION 1 and 2 2 and 3 Not installed FB PIN Connected to GND Connected to VL Connected to feedback resistors R2 and R3 MAX1653 OUTPUT VOUT = +3.3V VOUT = +5V VOUT = adjustable +2.5V to +5.5V range
Evaluating Other Output Voltages
To generate output voltages other than +3.3V or +5V in the +2.5V to +5.5V range, remove the shunt from the JU3 pins, and select the external voltage-divider resistors R2 and R3. Refer to the Setting the Output Voltage section in the MAX1652-MAX1655 data sheet for instructions on calculating R2 and R3 values. A 100k, 1% resistor is provided at the R3 location to prevent the feedback pin (FB) from floating if no shunt is installed on JU3.
Table 4. Jumper JU4 (Switching Frequency)
SHUNT LOCATION 1 and 2 2 and 3 Not installed SYNC PIN Connected to GND Connected to REF Drive externally FREQUENCY (kHz) 150 300 190 to 340
Evaluating the MAX1655
To generate output voltages in the +1.0V to +5.5V range, replace the MAX1653 with the MAX1655, remove the shunt from the JU3 pins, and select the external voltage-divider resistors R2 and R3. Refer to the Setting the Output Voltage section in the MAX1652- MAX1655 data sheet for instructions on calculating R2 and R3 values.
2
_______________________________________________________________________________________
VL C3 D1 CMPSH-3 11 3 DH 16 BST 14 3 C4 0.1F LX 15 15H 8 DL 13 2 5 SYNC PGND 12 3 REF CSL 9 4 GND SS 1 VL C6 0.01F 3 FB 7 2 JU3 1 R3 100k 1% C5 0.33F CSH 8 1 3 N1A IRF7303 2 D2 MBR0530 7 L1 R1 4 N1B IRF7303 VL 6 5 1 2
Figure 1. MAX1653 EV Kit Schematic
C1 22F 35V 4.7F 16V 10 V+ C2 0.1F 3 JU1 2 6 SHDN
VIN
4.5V TO 28V
SHDN 1
VL
U1 MAX1653
3 2 SKIP 1 2
VOUT 0.033 1%
JU2
1
C7 220F 10V
R2 OPEN
SYNC
JU4
Evaluates: MAX1653/MAX1655
_______________________________________________________________________________________
REF
MAX1653 Evaluation Kit
3
MAX1653 Evaluation Kit Evaluates: MAX1653/MAX1655
1.0"
Figure 2. MAX1653 EV Kit Component Placement Guide-- Component Side
1.0"
Figure 3. MAX1653 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX1653 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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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