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19-3327; Rev 0; 7/04
MAX1540 Evaluation Kit
General Description
The MAX1540 evaluation kit (EV kit) demonstrates the standard 5A application circuit of the MAX1540. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating precision low-voltage chipset, dynamic random access memory (DRAM), and input/output (I/O) power supplies for notebook computers. The MAX1540 EV kit provides a fixed 1.8V output voltage (OUT1), a fixed 2.5V output voltage (OUT2), and a fixed 5V, 100mA linear regulator (LDOOUT) from the 7V to 24V battery input range. It delivers up to 5A output current for each output voltage with greater than 90% efficiency. The EV kit operates at 355kHz/485kHz switching frequency (OUT2/OUT1, respectively) and has superior line- and load-transient response. This EV kit is a fully assembled and tested circuit board. It also allows the evaluation of other output voltages in the 0.7V to 5.5V range by changing resistors R21 and R22 for OUT1, and resistors R19 and R20 for OUT2. o 7V to 24V Input Voltage Range o Fixed 2.5V and 1.8V Output Voltages (Adjustable from 0.7V to 5.5V) o Fixed 5V/100mA Linear Regulator o 5A Output Current for Each Output o 355kHz (OUT2) and 485kHz (OUT1) Switching Frequency o Selectable Inductor Saturation Protection o Separate Power-Good Outputs o Selectable Overvoltage/Undervoltage Protection o Low-Profile Components o Fully Assembled and Tested
Features
Evaluates: MAX1540
Ordering Information
PART MAX1540EVKIT TEMP RANGE IC PACKAGE 0C to +70C 32 Thin QFN 5mm x 5mm
Component List
DESIGNATION QTY C1 C2, C3 0 2 DESCRIPTION Not installed (1812) 10F, 25V ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM TDK C4532X7R1E106K 220F, 4V, 25m low-ESR capacitors Sanyo 4TPE220M Not installed (case D) 1F, 10V X7R ceramic capacitors (0603) Murata GRM188R61A105K Taiyo Yuden LMK107BJ105KA TDK C1608X5R1A105K 0.1F, 25V X7R ceramic capacitors (0603) Murata GRM188R71E104K TDK C1608X7R1E104K 0.22F, 16V X7R ceramic capacitor (0603) Taiyo Yuden EMK107BJ224KA TDK C1608X7R1C224K 10F, 10V tantalum capacitor (case B) AVX TAJB106M010 Kemet T491B106M010AS DESIGNATION QTY C16 C23 C24, C25 D1, D2 D3 JU1, JU2, JU3 JU4, JU5 L1 0 1 0 2 1 3 2 1 DESCRIPTION Not installed (0805) 4.7F, 25V X7R ceramic capacitor (1210) TDK C3325X7R1E475K Not installed (0603) 2A, 30V Schottky diodes Central Semiconductor CMSH2-40M 100mA, 30V, dual Schottky diode Central Semiconductor CMPSH-3A 3-pin headers 4-pin headers 2.2H, 7.5A power inductor Sumida CDRH105-2R2 Sumida CDEP104(L)-2R2 4H, 6.2A power inductor Sumida CDEP105(S)-4R0 n-channel MOSFETs (SO8) Fairchild FDS6612A n-channel MOSFETs (SO8) Fairchild FDS6670A
C4, C6 C5, C7
1 0
C9, C11, C18
3
C10, C14, C17
3
L2 N1, N3 N2, N4
1 2 2
C12
1
C15
1
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX1540 Evaluation Kit Evaluates: MAX1540
Component List (continued)
DESIGNATION QTY R1, R2 R3 R4, R7, R10, R13, R16, R20, R22 R5, R6, R8, R9, R11, R12, R17, R18, R19, R21, R23-R27 R14, R28 R15 U1 None None None 2 1 0 DESCRIPTION 0.010 1%, 0.5W resistors (2010) IRC LR2010-01-R010-F Dale WSL-2010-R010F 20 5% resistor (0603) Not installed (short PC trace) (0603)
Quick Start
Equipment Needed
* 7V to 24V power supply, battery, or notebook AC adapter * Dummy loads capable of sinking 5A * Digital multimeters (DMMs) * 100MHz dual-trace oscilloscope
Procedure
0 Not installed (0603)
1) Ensure that the circuit is connected correctly to the supplies and dummy load prior to applying any power. 1) Verify that the shunts are across: a) JU1 pins 1 and 2 (ON1 high), JU2 pins 1 and 2 (ON2 high) b) JU4 pins 1 and 2 (SKIP high, forced PWM) c) JU5 pins 1 and 3 (TON = REF, 450kHz switching frequency) d) JU3 pins 1 and 2 (linear regulator enabled) 3) Turn on VIN, input/battery power supply. 4) Verify that the output voltages are V OUT1 = 1.8V, VOUT2 = 2.5V, and VLDOOUT = 5V.
2 0 1 1 5 4
100k 5% resistors (0603) Not installed (short PC trace) (1206) MAX1540ETJ (32-pin TQFN 5mm x 5mm) MAX1540 PC board Shunts Rubber bumpers
Component Suppliers
SUPPLIER AVX Central Semiconductor Dale-Vishay Fairchild IRC Murata Nihon Sanyo Sumida Taiyo Yuden TDK PHONE 843-946-0238 516-435-1110 402-564-3131 408-721-2181 361-992-7900 770-436-1300 847-843-7500 619-661-6835 708-956-0666 800-348-2496 847-390-4373 FAX 843-626-3123 516-435-1824 402-563-6296 408-721-1635 361-992-3377 770-436-3636 847-843-2798 619-661-1055 708-956-0702 847-925-0899 847-390-4428 WEBSITE www.avxcorp.com www.centralsemi.com www.vishay.com www.fairchildsemi.com www.irctt.com www.murata.com www.niec.co.jp www.sanyovideo.com www.sumida.com www.t-yuden.com www.component.tdk.com
Note: Indicate that you are using the MAX1540 when contacting these component suppliers.
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MAX1540 Evaluation Kit
Detailed Description
Jumper Settings
Evaluates: MAX1540
Table 4. Jumper JU4 Functions (Low-Noise Mode)
JU4 SKIP PIN Connected to LDOOUT. Connected to REF. Connected to GND. Unconnected. OPERATIONAL MODE Low-noise mode, OUT1 and OUT2 are in forced-PWM mode. OUT1 is in pulse-skipping mode. OUT2 is in forced-PWM mode. OUT1 and OUT2 are in pulseskipping mode. OUT1 is in forced-PWM mode. OUT2 is in pulse-skipping mode. 1 and 2 (default)
Table 1. Jumper JU1 Functions (Output-Voltage OUT1 Control)
JU1 1 and 2 (default) 2 and 3 ON1 PIN Connected to LDOOUT. Connected to GND. OUT1 OUT1 enabled, VOUT1 = 1.8V. OUT1 shutdown mode. OUT1 operation depends on the external ON1 signal levels.
1 and 3 1 and 4 Not installed
ON1 must be driven by an external signal Not installed connected to the ON1 pad.
Table 2. Jumper JU2 Functions (Output-Voltage OUT2 Control)
JU2 1 and 2 (default) 2 and 3 ON2 PIN Connected to LDOOUT. Connected to GND. OUT2 OUT2 enabled, VOUT2 = 2.5V. OUT2 shutdown mode. OUT2 operation depends on the external ON2 signal levels.
Table 5. Jumper JU5 Functions (Switching-Frequency Selection)
JU5 1 and 2 1 and 3 (default) 1 and 4 Not installed TON PIN Connected to VCC. Connected to REF. Connected to GND. Unconnected. FREQUENCY (OUT1/OUT2) (kHz) 235/170 485/355 (as shipped) 620/460 345/255
ON2 must be driven by an external signal Not installed connected to the ON2 pad.
Table 3. Jumper JU3 Functions (Linear-Regulator LDOOUT Control)
JU3 1 and 2 (default) 2 and 3 LDOON PIN Connected to LDOIN through JU3. Connected to GND. LDOOUT LDOOUT enabled, VLDOOUT = 5V. LDOOUT shutdown mode. R11 and R12 set the LDOIN undervoltagelockout threshold.
Note: Do not change the operating frequency without first recalculating component values because the frequency has a significant effect on preferred inductor value, peak current-limit level, MOSFET heating, PFM/PWM switchover point, output noise, efficiency, and other critical parameters.
Evaluating Other Fixed Output Voltages
The MAX1540 provides a fixed 1.8V output (OUT1) when FB1 is connected to GND (R21 = open, R22 = 0) and a fixed 2.5V output (OUT2) when FB2 is connected to GND (R19 = open, R20 = 0). OUT1 and OUT2 can also be adjusted from 0.7V to 5.5V by using a resistive voltage-divider at FB1 and FB2. The MAX1540 regulates FB1 and FB2 to a fixed reference voltage (0.7V). The adjusted output voltage is: VOUT1 = VFB1 (1 + R21 / R22) VOUT2 = VFB2 (1 + R19 / R20) where: VFB1 = VFB2 = 0.7V. Refer to the MAX1540/MAX1541 data sheet for selection of output capacitor and inductor values for various output voltages.
LDOON connected to Not installed voltage-divider R11/R12.
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MAX1540 Evaluation Kit Evaluates: MAX1540
LDOOUT LDOOUT VIN VIN VCC C1 OPEN 1 REF R13 R18 SHORT OPEN R17 OPEN C2 10F 3 R3 20 VCC REF C9 1F 7 VCC REF VCC 5 OVP/UVP LSAT VCC U1 C14 0.1F 20 LDOOUT C15 10F 10V V+ 19 C23 4.7F R16 SHORT
R15 SHORT C16 OPEN BST1
VIN
3 D3 L 1 7 R 2 6 5 1 3 VIN
MAX1540
BST2 DH2
16 14
BST2 BST2 7 6 5 D2 2 1 3 JU12
VCC
R4 SHORT
R5 OPEN
ILIM2
LX2
C17 15 0.1F 8 N4 FDS6670A 4
8 N3 FDS6612A 4
C3 10F
2
REF
R27 R25 OPEN OPEN R26 OPEN 6 5 1 3
R6 OPEN 7
R9 OPEN
R7 SHORT
R8 OPEN 6 R10 SHORT ILIM1
DL2 GND CSP2
18 17 9
R24 OPEN C25 OPEN
L2 4.0H
8
N1 BST1 FDS6612A 4 BST1 2 6 5 1 3 JU10 7 8
C10 0.1F N2 FDS6670A 24
23 BST1 25 DH1 24 LX1
CSN2 OUT2
10 12
JU11
R2 0.01 C6 220F C7 OPEN C18 1F
2.5V OUT2
L1 2.2H
R23 OPEN C24 OPEN
D1
21
DL1
30 27
CSP1 OUT1 CSN1 LDOON 22 LDOOUT
1.8V OUT1 C11 1F C4 220F
R1 0.01 C5 OPEN VCC REF PGND JU5 2 4 1 LDOOUT R14 100k 3
VIN 1 2 JU3 3 OUT2 JU2 R19 OPEN OUT1 R20 SHORT R21 OPEN R12 OPEN R11 VIN OPEN
JU9 LDOOUT REF JU4 2 4 1 3 LDOOUT 1
29
2 4
SKIP TON
ON2
31
1 2 3
FB2
11
2 32 ON1 JU1 3 13 PGOOD2 REF 8 FB1 PGOOD1 REF 26 C12 0.22F
LDOOUT 28 R28 100k
PGOOD2
PGND
GND
R22 SHORT PGOOD1
Figure 1. MAX1540 EV Kit Schematic
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MAX1540 Evaluation Kit Evaluates: MAX1540
Figure 2. MAX1540 EV Kit Component Placement Guide--Top Silkscreen
Figure 3. MAX1540 EV Kit Component Placement Guide-- Bottom Silkscreen
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MAX1540 Evaluation Kit Evaluates: MAX1540
Figure 4. MAX1540 EV Kit PC Board Layout--Component Side
Figure 5. MAX1540 EV Kit PC Board Layout--Ground Layer 2
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MAX1540 Evaluation Kit Evaluates: MAX1540
Figure 7. MAX1540 EV Kit PC Board Layout--Solder Side
Figure 6. MAX1540 EV Kit PC Board Layout--Ground Layer 3
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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