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MAX1637 Evaluation Kit
General Description
The MAX1637 evaluation kit (EV kit) contains two separate switching-regulator circuits. The first circuit converts high-voltage battery power into a low-voltage supply rail for next-generation notebook CPU cores. Its output is fixed at 1.7V and delivers up to 7A output current with greater than 87% efficiency. The second circuit generates a low-voltage supply for general-purpose use. Its output is fixed at 2.5V and delivers up to 3A output current. The battery range for both circuits is 4.5V to 22V, and both require a separate 5V input voltage to power the MAX1637. Output voltages can be adjusted by changing the feedback resistor values. The MAX1637 EV kit has excellent dynamic response to correct for fast output transients. This EV kit is a fully assembled and tested circuit board.
____________________________Features
o 4.5V to 22V Battery Voltage Range o 4.5V to 5.5V Input Voltage Range (IC Power) o Output Voltage: Fixed 1.7V, 7A (Circuit 1) Fixed 2.5V, 3A (Circuit 2) o Circuit 1 Efficiency = 90% (VIN = 7V, VOUT = 1.7V @ IOUT = 3A) o Circuit 2 Efficiency = 91% (VIN = 7V, VOUT = 2.5V @ IOUT = 3A) o 3A Max IC Shutdown Current o Fast MOSFETs for Low Switching Losses o Tight PC Board Layout for Low Switching Losses o 300kHz Switching Frequency o Surface-Mount Construction o Fully Assembled and Tested
Evaluates: MAX1637
Ordering Information
PART MAX1637EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 16 QSOP
Component List
DESIGNATION C1, C2, C3, C4, C22 QTY 5 DESCRIPTION 10F, 25V ceramic capacitors Tokin C34Y5U1E106Z or United Chemi-Con/Marcon THCR50E1E106ZT 470F, 6.3V, 30m, low-ESR tantalum capacitors Kemet T510X477M006 470F, 4V, 55m, low-ESR tantalum capacitors Sprague 594D477X0004R2T 0.1F ceramic capacitors 1500pF ceramic capacitors 1F ceramic capacitors 4.7F, 16V tantalum capacitors Sprague 595D475X0016A2B Not installed 0.01F ceramic capacitors 2A Schottky diode SGS-Thomson STPS2L25U or Nihon EC20QS03L 1A Schottky diode International Rectifier 10BQ040 or Motorola MBRS130LT3 N3 1 N2 1 N1 1 DESIGNATION D2, D3 QTY 2 DESCRIPTION Schottky diodes Central Semiconductor CMPSH-3 2.2H power inductor Panasonic P1F2R0HL, Coiltronics UP4B-2R2, or Coilcraft DO5022P-222HC 10H power inductor Sumida CDRH125-100, Coiltronics UP2B-100, or Coilcraft DO3316P-103 N-channel MOSFET Fairchild FDS6612 or FDS9412, International Rectifier IRF7803, or Siliconix Si9804DY N-channel MOSFET Fairchild FDS6680 or Siliconix Si4420DY N-channel MOSFET International Rectifier IRF7403 or Siliconix Si4412DY N-channel MOSFET International Rectifier IRF7413, Fairchild NDS8410A, or Siliconix Si4410DY
L1
1
C5, C6, C7, C20 OR C5, C6, C7, C8, C20 C9, C10, C17, C19 C11, C16 C12, C15 C13, C18 C14, C21, C23, C24 C25, C26 D1
4
5 4 2 2 2 0 2 1
L2
1
D4
1
N4
1
Component List continued on next page. ________________________________________________________________ Maxim Integrated Products
1
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.
MAX1637 Evaluation Kit Evaluates: MAX1637
Component List (continued)
DESIGNATION R1 R2 R3 R4-R9 R10, R11 R12 R13 R14 U1, U2 JU1-JU6 None None QTY 1 1 1 6 2 1 1 1 2 6 1 1 DESCRIPTION 0.010, 1%, 1W resistor Dale WSL-2512-R010F 56.2k, 0.1% resistor Dale TNPW-1206 series 100k, 0.1% resistor Dale TNPW-1206 series 1M, 5% resistors 20, 5% resistors 0.020, 1%, 0.5W resistor Dale WSL-2010-R020-F or IRC LR2010-R020-F 130k, 1% resistor 100k, 1% resistor MAX1637EEE 2-pin headers MAX1637 PC board MAX1637 data sheet SUPPLIER AVX Central Semiconductor Coilcraft Dale-Vishay Fairchild International Rectifier IRC Kemet Motorola Panasonic Sanyo SGS-Thomson Siliconix Sprague Sumida Taiyo Yuden Tokin Vishay/Vitramon
Component Suppliers
PHONE (803) 946-0690 (516) 435-1110 (708) 639-6400 (402) 564-3131 (408) 721-2181 (310) 322-3331 (512) 992-7900 (408) 986-0424 (602) 303-5454 (714) 373-7939 (619) 661-6835 (617) 259-0300 (408) 988-8000 (603) 224-1961 (847) 956-0666 (408) 573-4150 (408) 432-8020 (203) 268-6261 FAX (803) 626-3123 (516) 435-1824 (708) 639-1469 (402) 563-6418 (408)721-1635 (310) 322-3332 (512) 992-3377 (408) 986-1442 (602) 994-6430 (714) 373-7183 (619) 661-1055 (617) 259-9442 (408) 970-3950 (603) 224-1430 (847) 956-0702 (408) 573-4159 (408) 434-0375 (203) 452-5670
Quick Start
The MAX1637 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supplies until all connections are completed.
Note: Please indicate that you are using the MAX1637 when contacting these component suppliers.
2.5V Output (3A Configuration)
1) Connect a +7V to +22V supply voltage to the VBATT pad. Connect a +4.5V to +5.5V supply voltage to the VBIAS pad. Connect the grounds to the GND pads. 2) Connect a voltmeter and load, if any, to the VOUT pad. 3) Turn on the VBATT power supply to the board first. 4) Turn on the VBIAS power supply. Verify that the output voltage is 2.5V. 5) For other output voltages, refer to the Setting the Output Voltage section in the MAX1637 data sheet for instructions on selecting feedback resistors R13 and R14.
1.7V Output (7A Configuration)
1) Connect a +4.5V to +22V supply voltage to the VBATT pad. Connect a separate +4.5V to +5.5V supply voltage to the VBIAS pad. Connect the grounds to the GND pads. 2) Connect a voltmeter and load, if any, to the VOUT pad. 3) Turn on the VBATT power supply to the board first. 4) Turn on the VBIAS power supply. Verify that the output voltage is 1.7V. 5) For other output voltages, refer to the Setting the Output Voltage section in the MAX1637 data sheet for instructions on selecting feedback resistors R2 and R3.
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MAX1637 Evaluation Kit Evaluates: MAX1637
Table 1. Jumpers JU1 and JU2 Functions
SHUNT LOCATION OFF SKIP PIN Connected to GND Connected to VBIAS OPERATIONAL MODE Idle mode, pulse-skipping operation for highest lightload efficiency Low-noise mode, fixed frequency PWM operation.
Table 3. Jumpers JU5 and JU6 Functions
SHUNT LOCATION OFF ON SHDN PIN MAX1637 OUTPUT
Connected to VBIAS MAX1637 enabled Connected to GND Shutdown mode, VOUT = 0V
ON
Jumper Selection
The 2-pin headers JU1 and JU2 select the mode of operation. Table 1 lists the selectable jumper options. The 2-pin headers JU3 and JU4 select the operating frequency. Table 2 lists the selectable jumper options. The EV kit's components are selected for 300kHz operation. Component values might need to be changed if 200kHz operation is selected (refer to the Design Procedure section in the MAX1637 data sheet). Synchronize the oscillator to an external clock signal by driving the SYNC pad with a pulse train of 5V amplitude in the 240kHz to 340kHz frequency range. The 2-pin headers JU5 and JU6 select the shutdown mode. Table 3 lists the selectable jumper options.
Table 2. Jumpers JU3 and JU4 Functions
SHUNT LOCATION OFF ON SYNC PIN Connected to VBIAS Connected to GND FREQUENCY (kHz) 300 200
Detailed Description
Both switching regulators require a bias supply voltage (VBIAS) to power the IC and provide gate-drive current. VBIAS must be in the range of 4.5V to 5.5V due to the MOSFETs selected, although the MAX1637 itself operates over a wider range (3.15V to 5.5V). The +5V VBIAS supply must be capable of sourcing at least 20mA. Actual VBIAS current draw is: IBIAS = (QG1 + QG2) x f + ICC where Q G1 , Q G2 is the total gate charge of the MOSFETs at V GS = VBIAS, and I CC is the current drawn by the MAX1637 VCC input. Battery power must be applied prior to VBIAS power due to the output undervoltage lockout built into the MAX1637. If VBIAS is applied first, the circuit begins switching and attempts to bring up the output voltage. Since battery power is not present, the 20ms UVLO timer expires and the PWM is latched off until VBIAS or SHDN is cycled.
_______________________________________________________________________________________
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Evaluates: MAX1637
MAX1637 Evaluation Kit
4
VCC VCC C9 0.1F 9 VGG BST 5, 6, 7, 8 DH 5 REF 14 N1 1, 2, 3 5, 6, 7, 8 11 4 N2 1, 2, 3 D1 12 1 2 3 4 C11 1500pF L1 2.2H 15 C10 0.1F R1 0.010 1% 4 13 D2 CMPSH-3 C1 10F 25V C2 10F 25V C3 10F 25V 10 VCC 6 SHDN C26 0.01F R10 20 C13 4.7F 16V VBATT 4.5V TO 22V C4 10F 25V
VBIAS 4.5V TO 5.5V
Figure 1. MAX1637 EV Kit Schematic (1.7V, 7A)
U1 MAX1637
DL PGND CSH 16 SKIP FB 7 SYNC CC CSL 2 JU3 1 8 GND LX C12 1F VBIAS 2 JU2 1 C5 470F 6.3V C6 470F 6.3V C7 470F 6.3V VOUT 1.7V C8 OPEN SENSE R2 56.2k 0.1% C14 OPEN R3 100k 0.1% CUT TRACE FOR REMOTE SENSING
R6 1M
ON/OFF
JU5
REF
R4 1M
SKIP
R5 1M
VBIAS
_______________________________________________________________________________________
SYNC
VBIAS 4.5V TO 5.5V VCC R11 20 C17 0.1F 9 VCC VGG BST 5, 6, 7, 8 DH 5 REF 14 N3 1, 2, 3 5, 6, 7, 8 11 4 N4 D4 1, 2, 3 12 1 2 3 4 C16 1500pF L2 10H 15 C19 0.1F R12 0.020 1% 4 C22 10F 25V 13 C23 OPEN 6 SHDN C25 0.01F D3 CMPSH-3 10 C18 4.7F 16V
Figure 2. MAX1637 EV Kit Schematic (2.5V, 3A)
R7 1M VBATT 4.5V TO 22V
ON/OFF
JU6
REF
U2 MAX1637
DL PGND CSH
LX
VOUT 2.5V
C15 1F VBIAS GND 2 16 SKIP SYNC FB CC CSL 7 R9 1M 2 JU4 1 JU1 1 8 R8 1M
C20 470F 6.3V
C24 OPEN
SENSE
SKIP
SYNC
R13 130k 1%
VBIAS
C21 OPEN
R14 100k 1%
Evaluates: MAX1637
_______________________________________________________________________________________
CUT TRACE FOR REMOTE SENSING
MAX1637 Evaluation Kit
5
MAX1637 Evaluation Kit Evaluates: MAX1637
1.0"
1.0"
Figure 3. MAX1637EV Kit--Component Placement Guide
Figure 4. MAX1637 EV Kit PC Board Layout--Component Side
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MAX1637 Evaluation Kit Evaluates: MAX1637
1.0"
1.0"
Figure 5. MAX1637 EV Kit PC Board Layout--Two Internal Ground Planes
Figure 6. MAX1637 EV Kit PC Board Layout--Solder Side
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MAX1637 Evaluation Kit Evaluates: MAX1637
NOTES
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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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