View MAX1638EVKIT_293013.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MAX1638VRM Evaluation Kit
_______________General Description
The MAX1638VRM evaluation kit (EV kit) provides a digitally programmable output voltage between 1.3V and 3.5V from a 5V input supply. It delivers up to 14A output current with greater than 90% efficiency. The MAX1638 features 1% output accuracy as well as 1% AC-load regulation. The EV kit operates at a 600kHz switching frequency and has excellent dynamic response to correct for fast output transients. A separate test-fixture PC board emulates a system motherboard and contains a 22F ceramic capacitor that models the local CPU bypass capacitors. The test fixture also puts the GlitchCatcher MOSFETs on the correct side of the VRM connector, in order to reduce stray inductance.
____________________________Features
4.5V to 5.5V Input Voltage Range 1.3V to 3.5V Output Voltage Range 14A Output Current Capability 1% AC-Load Regulation Power-Good Output 600kHz Switching Frequency GlitchCatcher(R) Provides Excellent LoadTransient Response (MAX1638VRM test fixture) o 24-Pin SSOP Package o Fully Assembled and Tested o o o o o o o
Evaluates: MAX1638
MAX1638VRM EV Board _____________________Component List
DESIGNATION QTY C1, C2, C3 3 4 3 1 1 1 1 1 1 1 DESCRIPTION 220F, 10V, low-ESR capacitors Sanyo 10SA220M 220F, 4V, low-ESR capacitors Sanyo 4SP220M 0.1F ceramic capacitors 10F, 10V tantalum capacitor Sprague 595D106X0010A 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2T 2.2F, 10V ceramic capacitor TDK C3216X7R1C225M or Taiyo Yuden EMK316BJ225ML 1000pF ceramic capacitor 0.056F ceramic capacitor Schottky diode Central Semiconductor CMPSH-3 0.47H power inductor Coiltronics UP4-R47 (0.47H) or Panasonic ETQP1F0R7H (0.7H) N-channel MOSFET (D2PAK) Fairchild FDB7030L or International Rectifier IRL3803S 0.009, 1%, 1W resistors Dale WSL-2512-R009-F 100, 5% resistor 10, 5% resistor 1k, 5% resistor 100k, 5% resistor MAX1638EAG (SSOP-24) 40-pin power connector AMP 532956-7 MAX1638VRM PC board 1
_______________Ordering Information
PART MAX1638VRMEVKIT TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
C5-C8 C9, C10, C14 C11
MAX1638VRM Test-Fixture _____________________Component List
DESIGNATION QTY C1 C2 U1 1 1 1 DESCRIPTION 22F, 10V ceramic capacitor TDK C4532X5RA226M or Taiyo Yuden LMK432BJ226K 1F ceramic capacitor N- and P-channel MOSFET (SO-8) International Rectifier IRF7105 0.5, 5%, 1/2W resistor (not installed) Dale WSL-2010-R5-J or IRC LR2010-01-R5-J 5-position dip switch 40-pin male power connector AMP 146315-1 MAX1638VRM test-fixture PC board
C12 C13 CC1 CC2 D1 L1
R1 SW1 P1 None
0 1 1 1
N1, N2 R1, R2 R3 R4 R5 R6 U1 J1 None
2 2 1 1 1 1 1 1 1
GlitchCatcher is a registered trademark of Maxim Integrated Products.
________________________________________________________________ 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.
MAX1638VRM Evaluation Kit Evaluates: MAX1638
______________Component Suppliers
SUPPLIER AVX Central Semiconductor Coilcraft Coiltronics Dale-Vishay Fairchild International Rectifier IRC Kemet Panasonic Sanyo Sprague Sumida Taiyo Yuden TDK Vishay/Vitramon PHONE (803) 946-0690 (516) 435-1110 (847) 639-6400 (561) 241-7876 (402) 564-3131 (408) 721-2181 (310) 322-3331 (512) 992-7900 (864) 963-6300 (201) 392-7522 (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 (561) 241-9339 (402) 563-6418 (408) 721-1635 (310) 322-3332 (512) 992-3377 (864) 963-6521 (201) 392-4441 (619) 661-1055 (603) 224-1430 (847) 956-0702 (408) 573-4159 (847) 390-4428 (203) 452-5670 SHUNT LOCATION 2&3 Not installed 1&2 LG PIN Connected to GND Floating Connected to VCC AC LOOP REGULATION (%) 0.5 1 2 0 1 1 -- 1 1 1 0 0 -- 1 1 1 0 0 -- 1 1 1 0 0 -- 1 1 1 0 1 -- 0 1
Table 1. MAX1638 Output Voltage Adjustment Settings (abbreviated)
D4 0 0 -- D3 0 0 -- D2 0 0 -- D1 0 0 -- D0 0 1 -- OUTPUT VOLTAGE (V) 2.050 2.000 Decreases in 50mV increments 1.3 3.5 3.4 Decreases in 100mV increments 2.1 Off
Table 2. Jumper JU1 Functions
Note: Please indicate that you are using the MAX1638 when contacting these component suppliers.
_________________________Quick Start
The MAX1638VRM 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 located on the MAX1638VRM test board. 2) Connect a voltmeter and load, if any, to the VOUT pad. 3) Turn on the power supply to the board. 4) Set switch SW1 per Table 1 to get the desired output voltage.
Table 3. Jumper JU2 Functions
SHUNT LOCATION 1&4 1&2 1&3 FREQ PIN Connected to GND Connected to REF Connected to VCC SWITCHING FREQUENCY (kHz) 300 600 1000
_______________Detailed Description
Jumper Selection
The 3-pin jumper JU1 selects the AC loop gain. Table 2 lists the selectable jumper options. JU1 allows the user to trade off gain response to AC-load regulation and transient response. AC-load regulation can be set to 0.5%, 1%, and 2%. The default value is 1%.
The 4-pin jumper JU2 selects the switching frequency. Table 3 lists the selectable jumper options. The EV kit's components are selected for 600kHz operation. If 300kHz or 1MHz operation is selected, component values might 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 MAX1638 data sheet).
2
_______________________________________________________________________________________
4.5V TO 5.5V VCC C14 0.1F 1 L C11 10F 10V 3 R 2 R4 10 D1 CMPSH-3 C1 220F 10V C2 220F 10V C3 220F 10V
VIN VIN VIN VIN VIN
J1-1 J1-2 J1-3 J1-21 J1-22
9 20 VDD DH R2 0.009 8 LG LX DL PWROK PGND 10 REF CSH CSL 7 D0 FB PDRV NDRV CC1 CC2 FREQ AGND 11 REF VCC 2 3 15 1 14 CC2 0.056F 13 R5 1k 18 J1-23 NDRV 19 J1-5 PDRV D1 D2 D3 D4 12 6 5 17 16 3 4 22 21 N2 C5 220F 4V C6 220F 4V C7 220F 4V 23 C9 0.1F C8 220F 4V L1 0.47H R1 0.009 BST 1 VCC N1 24
Figure 1. MAX1638VRM EV Kit Schematic
J1-11 J1-13 J1-15 J1-17 J1-19 J1-30 J1-32 J1-34 J1-36 J1-38 J1-40 GND GND GND GND GND GND GND GND GND GND GND
VCC
C12 4.7F 16V
C10 0.1F
2% 1% 2 0.5%
1
JU1
3
VIN
R6 100k
MAX1638
2 REF
PWRGD J1-29
R3* 100
OUTEN J1-26
C13 2.2F 10V
J1-10 J1-12 J1-14 J1-16 J1-18 J1-20 J1-31 J1-33 J1-35 J1-37 J1-39
VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT SENSE
VID0
J1-7
VID1
J1-27
VID2
J1-8
VID3
J1-28
VID4
J1-9
CC1 1000pF
J1-4
12VIN
J1-6
ISHARE
J1-24
12VIN
JU2 4
J1-25
UP
Evaluates: MAX1638
_______________________________________________________________________________________
*R3 RECOMMENDED FOR REMOTE SENSING
MAX1638VRM Evaluation Kit
3
MAX1638VRM Evaluation Kit Evaluates: MAX1638
GlitchCatcher Current-Boost Driver
Drivers for an optional current-boost circuit (GlitchCatcher) are included in the MAX1638. The current-boost circuit is intended to improve transient response to fast-load step changes by bypassing the inductor's lowpass filter operation. When the output voltage drops out of regulation by more than 2%, the P-channel or N-channel switches turn on and force the output back into regulation. The GlitchCatcher circuit is located on the solder side of the MAX1638VRM test fixture. For more information, refer to the section Choosing the GlitchCatcher MOSFETs in the MAX1638 data sheet.
1.0"
Figure 2. MAX1638VRM EV Kit Component Placement Guide--Component Side
1.0"
Figure 3. MAX1638VRM EV Kit Component Placement Guide--Solder Side
4 _______________________________________________________________________________________
MAX1638VRM Evaluation Kit Evaluates: MAX1638
1.0"
Figure 4. MAX1638VRM EV Kit PC Board Layout--Component Side
1.0"
Figure 5. MAX1638VRM EV Kit PC Board Layout--Internal Signal Plane (Layer 2)
_______________________________________________________________________________________
5
MAX1638VRM Evaluation Kit Evaluates: MAX1638
1.0"
Figure 6. MAX1638VRM EV Kit PC Board Layout--Internal GND Plane (Layer 3)
1.0"
Figure 7. MAX1638VRM EV Kit PC Board Layout--Solder Side
6
_______________________________________________________________________________________
MAX1638VRM Evaluation Kit Evaluates: MAX1638
PWRGD
P1-29 PWRGD P1-1 P1-2 VIN VIN VIN VIN VIN GND GND GND GND GND GND GND GND GND GND GND SENSE VID0 VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT P1-10 P1-12 P1-14 P1-16 P1-18 P1-20 P1-31 P1-33 P1-35 P1-37 VOUT
VIN 4.5 TO 5.5V
P1-3 P1-21 P1-22 P1-11 P1-13 P1-15 P1-17 P1-19
GND
P1-30 P1-32 P1-34 P1-36 P1-38 P1-40
SENSE D0 SW1E 5 6
P1-39 P1-7
VIN 3
C2 1F
D1 SW1D 4 7
P1-27
VID1
PDRV
P1-5
4
U1B IRF7105 6 5 R1 SHORT (PC TRACE) *C1 22F 10V
D2 SW1C 3 8
P1-8
VID2 8 2 7 U1A IRF7105
D3 SW1B 2 9
P1-28
VID3
NDRV P1-23
D4 SW1A 1 10
P1-9
VID4
*MODELS LOCAL CPU BYPASS CAPACITORS
Figure 8. MAX1638VRM EV Kit Test Fixture
_______________________________________________________________________________________ 7
MAX1638VRM Evaluation Kit Evaluates: MAX1638
1.0"
1.0"
Figure 9. MAX1638VRM EV Kit Test Fixture Component Placement Guide--Component Side
Figure 10. MAX1638VRM EV Kit Test-Fixture Component Placement Guide--Solder Side
1.0"
1.0"
Figure 11. MAX1638VRM EV Kit Test-Fixture PC Board Layout--Component Side
Figure 12. MAX1638VRM EV Kit Test-Fixture 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.
8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX1638EVKIT

	To Download MAX1638EVKIT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .