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19-3625; Rev 0; 3/05
MAX8717 Evaluation Kit
General Description
The MAX8717 evaluation kit (EV kit) demonstrates the MAX8717's standard application circuit. This dual-PWM synchronous DC-DC converter steps down high-voltage batteries and/or AC adapters, generating main supplies for notebook computers. The MAX8717 EV kit provides dual 5V and 3.3V output voltages from the 6V to 24V battery input range. It delivers up to 5A output current for the 5V output and 5A for the 3.3V output with 95% efficiency. The EV kit operates at 300kHz switching frequency and has superior lineand load-transient response. This EV kit is a fully assembled and tested circuit board. Both outputs are adjustable between 1.0V and 5.5V by changing feedback resistors R20, R21, R24, and R26. 6V to 24V Input Voltage Range Output Voltages 3.3V at 5A (Adjustable from 1.0V to 5.5V) 5.0V at 5A (Adjustable from 1.0V to 5.5V) 300kHz Switching Frequency (Selectable 200kHz/300kHz/500kHz) Independently Selectable PWM, Skip, and LowNoise Mode Operation Independent Power-Good Outputs Low-Profile Components Fully Assembled and Tested
Features
Evaluates: MAX8717
Ordering Information
PART MAX8717EVKIT TEMP RANGE 0C to +70C IC PACKAGE 28 Thin QFN 5mm x 5mm
Component List
DESIGNATION C1, C19 QTY 0 DESCRIPTION Not installed (E case) 220F, 6.3V, 25m low-ESR capacitor (D case) Sanyo 6TPE220M Kemet T520V227M006ASE025 150F, 6.3V, 25m low-ESR capacitor (D case) Sanyo 6TPE150M Kemet T520D157M006ASE025 Not installed (1812) 10F 20%, 25V X5R ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM or TDK C4532X5R1E106M 0.1F 10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H104K or equivalent 1F 20%, 10V X5R ceramic capacitors (0805) Taiyo Yuden LMK212BJ105KG or TDK C2012X7R1C105MKT D1, D2 2 DESIGNATION C13, C20, C21, C26 C14 QTY 0 DESCRIPTION Not installed (0603) 0.22F, 16V X5R ceramic capacitor (0805) Taiyo Yuden EMK212BJ224KG 10F 20%, 6.3V X5R ceramic capacitors (0805) TDK C2012X5R0J106M or Taiyo Yuden AMK212BJ106MG 1A, 30V Schottky diodes Nihon EP10QY03 or Toshiba CRS02 100mA, 30V Schottky diodes (SOT23) (top mark: D95) Central Semiconductor CMPSH-3 3-pin headers 4-pin headers
C2
1
1
C3
1
C27, C28
2
C4, C7
0
C5, C6
2
D3, D4 JU1, JU2 JU3, JU4, JU5 JU1 (1, 2), JU2 (1, 2), JU3 (1, 3), JU4 (1, 2), JU5 (1, 2)
2 2 3
C8, C9
2
5
Shunts
C12, C15
2
________________________________________________________________ Maxim Integrated Products
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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.
MAX8717 Evaluation Kit Evaluates: MAX8717
Component List (continued)
DESIGNATION QTY DESCRIPTION 5.7H, 5.8A, 10.3m power inductors Sumida CDEP105-5R7NC, or Sumida CDRH127/LD-5R8NC, or TDK RLF12560T-5R6N9R2 n-channel MOSFETs (8-pin SO) Fairchild FDS6612A n-channel MOSFETs (8-pin SO) Fairchild FDS6670A 0.007 1%, 1/2W resistors (2010) IRC LR2010-01-R0007-F or Dale WSL-2010-R0007F DESIGNATION R3-R6, R22, R23 R7, R8 R9 R10, R11, R19, R25 R15-R18, R20, R21, R24, R26, R29, R32 U1 None QTY 0 2 1 4 DESCRIPTION Not installed (short PC trace) (0603) 100k 5% resistors (0603) 20 5% resistor (0805) 0 1% resistors (0603)
L1, L2
2
N1, N3 N2, N4
2 2
0
Not installed (0603) MAX8717ETL (28-pin thin QFN 5mm x 5mm) MAX8717 PC board
R1, R2
2
1 1
Component Suppliers
SUPPLIER Central Semiconductor Dale-Vishay Fairchild IRC Kemet Murata Nihon Sanyo Sumida Taiyo Yuden TDK Toshiba PHONE 631-435-1110 402-564-3131 888-522-5372 361-992-7900 864-963-6300 770-436-1300 847-843-7500 619-661-6835 847-545-6700 800-348-2496 847-803-6100 408-526-2459 FAX 631-435-1824 402-563-6296 -- 361-992-3377 864-963-6322 770- 436-3636 847-843-2798 619-661-1055 847-545-6720 847-925-0899 847-390-4405 408-526-2426 WEBSITE www.centralsemi.com www.vishay.com www.fairchildsemi.com www.irctt.com www.kemet.com www.murata.com www.niec.co.jp www.sanyodevice.com www.sumida.com www.t-yuden.com www.component.tdk.com www.toshiba.com
Note: Indicate that you are using the MAX8717 when contacting these component suppliers.
Quick Start
Recommended Equipment
* 6V to 24V, power supply, battery, or notebook AC adapter * DC bias power supply, 5V at 100mA * Dummy loads capable of sinking 5A * Digital multimeters (DMMs) * 100MHz dual-trace oscilloscope
Procedure
1) Ensure that the circuit is connected correctly to the supplies and dummy loads prior to applying any power. 2) Verify that the shunts are across: a) JU1 pins 1 and 2 (ON1 high, OUT1 (3.3V) enabled) b) JU2 pins 1 and 2 (ON2 high, OUT2 (5.0V) enabled) c) JU3 pins 1 and 3 (300kHz switching frequency)
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MAX8717 Evaluation Kit
d) JU4 pins 1 and 2 (SKIP1 high, OUT1 in forcedPWM mode) e) JU5 pins 1 and 2 (SKIP2 high, OUT2 in forcedPWM mode) 3) Turn on input power VIN prior to +5V bias power; otherwise, the output UVLO timer times out and the FAULT latch is set, disabling the regulator outputs until +5V power is cycled or ON1/ON2 is toggled. 4) Verify that the output voltages are V OUT1 = 3.3V and VOUT2 = 5.0V.
Evaluates: MAX8717
Table 4. Jumper JU4 Functions (LowNoise Mode Control for OUT1)
JU4 1 and 2 (default) 1 and 3 1 and 4 SKIP1 PIN Connected to VCC. Connected to REF. Connected to GND. OPERATIONAL MODE OUT1 is in forced-PWM mode (fixed frequency). OUT1 is in low-noise mode. OUT1 is in pulseskipping mode.
Table 1. Jumper JU1 Functions (Output Voltage OUT1 Control)
JU1 1 and 2 (default) 2 and 3 Not installed ON1 PIN Connected to VCC. Connected to GND. OUT1 OUT1 is enabled, VOUT1 = 3.3V. OUT1 is disabled.
Table 5. Jumper JU5 Functions (LowNoise Mode Control for OUT2)
JU5 1 and 2 (default) 1 and 3 1 and 4 SKIP2 PIN Connected to VCC. Connected to REF. Connected to GND. OPERATIONAL MODE OUT2 is in forced-PWM mode (fixed frequency). OUT2 is in low-noise mode. OUT2 is in pulseskipping mode.
OUT1 operation ON1 must be driven by depends on the an external signal external ON1 signal connected to ON1 pad. levels.
Table 2. Jumper JU2 Functions (Output Voltage OUT2 Control)
JU2 1 and 2 (default) 2 and 3 Not installed ON2 PIN Connected to VCC. Connected to GND. ON2 must be driven by an external signal connected to ON2 pad. OUT2 OUT2 is enabled, VOUT2 = 5.0V. OUT2 is disabled. OUT2 operation depends on the external ON2 signal levels.
Detailed Description
Jumper Setting Evaluating Other Output Voltages
The MAX8717 provides a fixed 3.3V output (OUT1) when FB1 is connected to VCC (R25 = 0) and a fixed 5.0V output (OUT2) when FB2 is connected to VCC (R19 = 0). OUT1 and OUT2 can also be adjusted from 1.0V to 5.5V by using a resistive voltage-divider formed by R24, R26 (R25 = open), and R20, R21 (R19 = open). The MAX8717 regulates FB1, FB2 to a fixed reference voltage (1.0V). The adjusted output voltages are: VOUT1 = VFB1(1+R24/R26) where VFB1 = 1.0V; VOUT2 = VFB2(1+R20/R21) where VFB2 = 1.0V. Two 330pF to 1000pF feed-forward bypass capacitors (C13, C26) reduce duty-cycle jitter and feedback noise. Refer to the MAX8716/MAX8717/MAX8757 data sheet for selection of output capacitors and inductor values for different output voltages.
3
Table 3. Jumpers JU3 Functions (Switching-Frequency Selection)
JU3 1 and 2 1 and 3 (default) 1 and 4 FSEL PIN Connected to VCC. Connected to REF. Connected to GND. FREQUENCY (kHz) 500 300 (as shipped) 200
Note: Do not change the operating frequency without first recalculating component values. 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.
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MAX8717 Evaluation Kit Evaluates: MAX8717
VCC R7 100k PGOOD1
PGOOD1 CSL1
27 25
R6 SHORT (PC TRACE) R5 SHORT (PC TRACE)
CSH1 VDD VREF C14 0.22F 19 GND BST1 3 REF DH1 1 C15 1F 28 VCC R16 OPEN U1 8 VCC R18 OPEN VREF JU4 3 VCC VREF VOUT1 C13 OPEN R25 0 JU5 3 4 2 1 SKIP2 CSH2 R24 OPEN R26 OPEN VCC 500kHz JU3 2 3 1 4 200kHz VCC PGOOD2 1 ON1 VCC 1 ON2 3 JU2 2 3 JU1 2 6 ON1 FB2 26 VREF 300kHz 4 DL2 SKIP2 VCC 4 2 1 SKIP1 2 SKIP1 DH2 LX2 MAX8717 ILIM2 BST2 VCC LX1
24 R22 SHORT (PC TRACE) 3 D4 1 VDD 5 6 N1 4 1 65 20 VDD 17 18 C12 1F R23 SHORT (PC TRACE) C8 0.1F 4 1 65 16 4 1 12 VBIAS +5V VDD N2 4 1
VIN 8
VIN 24V MAX C6 10F 25V L1 5.7H R29 OPEN C20 OPEN GND R1 0.007 1% C1 OPEN
23 22 21
VCC VCC
R9 20
C9 0.1F
7
C4 OPEN
VOUT1
3 2 8 7 3 2 D1
VOUT1 3.3V AT 5A C2 220F 6.3V C28 10F GND 6.3V
VREF
R10 R15 0 OPEN
DL1 ILIM1 VDD PGND
VREF
R11 R17 0 OPEN
1 D3 3 5 6 8 7 N3 3 2 8 7 N4 3 2 C5 10F 25V C7 OPEN VIN R32 OPEN L2 5.7H C21 OPEN R2 0.007 1% VOUT2 VOUT2 5V AT 5A C19 OPEN C27 10F GND 6.3V
13
14 15
D2 R4 SHORT (PC TRACE) R3 SHORT (PC TRACE)
C3 150F 6.3V
FB1
CSL2
11 VCC
5
FSEL 9 10
R8 100k PGOOD2
VCC VOUT2 R19 0 R20 OPEN C26 OPEN
R21 OPEN 7 ON2
Figure 1. MAX8717 Schematic
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MAX8717 Evaluation Kit Evaluates: MAX8717
Figure 2. MAX8717 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX8717 EV Kit PC Board Layout--Top Silkscreen
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MAX8717 Evaluation Kit Evaluates: MAX8717
Figure 4. MAX8717 EV Kit PC Board Layout--Bottom Silkscreen
Figure 5. MAX8717 EV Kit PC Board Layout--Solder Side
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MAX8717 Evaluation Kit Evaluates: MAX8717
Figure 6. MAX8717 EV Kit PC Board Layout--PGND/Signal Layer 2
Figure 7. MAX8717 EV Kit PC Board Layout--PGND/AGND 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) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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