View MAX1639EVKIT_990089.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MAX1639 Evaluation Kit
________________General Description
The MAX1639 evaluation kit (EV kit) provides a 2.5V output voltage from a +4.5V to +5.5V input supply. It delivers up to 8A output current with greater than 90% efficiency. Features include pin-selectable switching frequencies of 300kHz, 600kHz, and 1MHz, as well as current-mode operation for superior load- and line-transient response. This EV kit operates at 600kHz switching frequency. It can also be used to evaluate other output voltages by changing the feedback resistors R2 and R3. This EV kit is fully assembled and tested, and is offered in a 16-pin narrow SO package.
____________________________Features
o +4.5V to +5.5V Input Voltage Range o 2.5V Output Voltage (1.1V to 4.0V adjustable) o 8A Output Current o Power-Good Output o 600kHz Switching Frequency o 16-Pin Narrow SO Package o Fully Assembled and Tested
Evaluates: MAX1639
_______________Ordering Information
PART MAX1639EVKIT TEMP. RANGE 0C to +70C PIN-PACKAGE 16 Narrow SO
____________________Component List
DESIGNATION QTY C1 C2, C3 C4, C5, C9 CC1 CC2 C6 C7 C8 C10, D1 D2 L1 N1, N2 R1 R2 R3 R4 R5 R6 U1 JU1 None None None 1 2 3 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 DESCRIPTION 330F, 6.3V, low-ESR capacitor Sanyo 6SA330M 560F, 4V, low-ESR capacitors Sanyo 4SP560M 0.1F ceramic capacitors 1000pF ceramic capacitor 0.056F ceramic capacitor 2.2F, 10V ceramic capacitor TDK C3216X7R1C225M or Taiyo Yuden EMK316BJ225ML 10F, 10V tantalum capacitor Sprague 595D106X0010A2T 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2T Not installed Schottky diode Central Semiconductor CMPSH-3 1.0H power inductor Coiltronics UP2B-1R0 or Coilcraft DO3316P-102HC N-channel MOSFETs (SO-8) Fairchild FDS6680 0.009, 1%, 1W resistor Dale WSL-2512-R009-F or IRC LR2512-01-R009-F 12.7k, 1% resistor 10k, 1% resistor 10, 5% resistor 100k, 5% resistor 1k, 5% resistor MAX1639ESE 2-pin header Shunt MAX1639 PC board MAX1639 data sheet
_________________________Quick Start
The MAX1639 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 +5V supply voltage to the VIN pad. Connect ground to the GND pad. 2) Connect a voltmeter and load, if any, to the VOUT pad. 3) Remove the shunt from JU1. 4) Turn on the power supply to the board. Verify that the output voltage is 2.5V.
_______________Detailed Description
The MAX1639 provides a 2.5V output from 4.5V to 5.5V input voltage. It delivers up to 8A and operates at 600kHz. Other output voltages can be programmed by changing the feedback resistor R2. R2 is given by: V R2 = R3 OUT - 1 1.1 where R3 =10k. For output voltages greater than 3.3V, use appropriately rated output capacitors (C2, C3).
Jumper Selection
The 2-pin header JU1 selects the shutdown mode. Table 1 lists the selectable jumper options. The 4-pin header JU2 selects the switching frequency. Table 2 lists the selectable jumper options. The EV kit's components are selected for 600kHz operation. If 300kHz or 1MHz operation is selected, component values need to be changed and the PC board trace between pins 1 and 2 of JU2 must be cut (refer to the Design Procedure section in the MAX1639 data sheet).
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.
MAX1639 Evaluation Kit Evaluates: MAX1639
Table 1. Jumper JU1 Functions
SHUNT LOCATION ON OFF REF PIN Connected to GND Floating MAX1639 OUTPUT Shutdown mode, VOUT = 0V MAX1639 enabled, VOUT = 2.5V
__________________Component Suppliers
SUPPLIER AVX Central Semiconductor Coilcraft Dale-Vishay Fairchild International Rectifier IRC Motorola Nihon Sanyo Sprague Sumida Taiyo Yuden TDK Vishay/Vitramon PHONE (803) 946-0690 (516) 435-1110 (847) 639-6400 (402) 564-3131 (408) 721-2181 (310) 322-3331 (512) 992-7900 (602) 303-5454 (805) 867-2555 (619) 661-6835 (603) 224-1961 (847) 956-0666 (408) 573-4150 (847) 390-4373 (203) 268-6261 FAX (803) 626-3123 (516) 435-1824 (847) 639-1469 (402) 563-6418 (408) 721-1635 (310) 322-3332 (512) 992-3377 (602) 994-6430 (805) 867-2698 (619) 661-1055 (603) 224-1430 (847) 956-0702 (408) 573-4159 (847) 390-4428 (203) 452-5670
Table 2. Jumper JU2 Functions
SHUNT LOCATION 1 and 3 1 and 2 1 and 4 FREQ PIN Connected to GND Connected to REF Connected to VCC SWITCHING FREQUENCY (kHz) 300 600 1000
Note: 1MHz operation can affect the allowable output voltage range (due to duty factor limitations); it also affects soft-start and foldback current limiting (see the MAX1639 data sheet).
Note: Please indicate that you are using the MAX1639 when contacting these component suppliers.
C1 330F 6.3V
VIN 4.5V TO 5.5V R4 10 C9 0.1F C7 10F 10V 12 C8 4.7H 16V REF ON/OFF JU1 VIN C6 2.2F 10V R5 100k R6 CC1 1000pF 1k CC2 0.056F 1 JU2 VCC 4 3 REF 2 6 REF C5 0.1F VDD VCC 3 1 L 2 R D2 CMPSH-3
5 VCC DH BST LX DL 16 1 C4 0.1F 5, 6, 7, 8 13 4 1, 2, 3 N2 L1 1H D1* OPEN R1 0.009 1% C2 560F 4V R2 12.7k 1% C3 560F 4V VOUT 2.5V 4 5, 6, 7, 8 N1 1, 2, 3
15
U1 MAX1639
PWRGD
2 9 10 11
PGND PWROK CC1 CC2 FREQ CSH CSL FB AGND 7
14
4 3 8 R3 10k 1% C10 OPEN
VOUT = 1.1(1 + R2 / R3)
*OPTIONAL
Figure 1. MAX1639 EV Kit Schematic Diagram
2 _______________________________________________________________________________________
MAX1639 Evaluation Kit Evaluates: MAX1639
1.0"
1.0"
Figure 2. MAX1639 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1639 EV Kit PC Board Layout--Component Side
1.0"
1.0"
Figure 4. MAX1639 EV Kit PC Board Layout--Two Internal Ground Planes
Figure 5. MAX1639 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.
3 _____________________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.

▲Up To Search▲

Price & Availability of MAX1639EVKIT

	To Download MAX1639EVKIT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .