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19-3841; Rev 0; 10/05
MAX8716 Evaluation Kit
The MAX8716 evaluation kit (EV kit) demonstrates the
MAX8716’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 MAX8716 EV kit provides dual +5V and +3.3V output voltages from +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 line- and 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 R19, R20, R21, and R22.
Features
♦ +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
♦ Independently Selectable PWM, Skip, and LowNoise-Mode Operation
♦ Independent Power-Good Outputs
♦ Low-Profile Components
♦ Fully Assembled and Tested
Ordering Information
PART
TEMP RANGE
MAX8716EVKIT
0°C to +70°C
IC PACKAGE
24 Thin QFN (4mm x 4mm)
Component List
DESIGNATION
C1, C3
QTY
2
DESCRIPTION
10µF ±20%, 25V X5R ceramic
capacitors (1210)
TDK C3225X7R1E106M
AVX 12103D106M
Taiyo Yuden TMK325BJ106MM
C2
0
Not installed (1210)
C4, C6
0
Not installed (E case)
C5
1
220µF, 4V, 40mΩ low-ESR capacitor
(D case)
Sanyo 4TPC220M
1
150µF, 6.3V, 40mΩ low-ESR
capacitor (D case)
Sanyo 6TPC150M
4
1µF ±20%, 10V X5R ceramic
capacitors (0805)
Taiyo Yuden LMK212BJ105KG or
TDK C2012X7R1C105MKT
2
0.1µF ±10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K or
equivalent
C7
C9, C11, C14,
C18
C10, C17
C12
1
0.22µF, 16V X5R ceramic capacitor
(0805)
Taiyo Yuden EMK212BJ224KG
C24, C25
0
Not installed (0603)
D1, D2
2
1A, 30V Schottky diodes
Nihon EP10QY03 or
Toshiba CRS02
DESIGNATION
QTY
DESCRIPTION
D3
1
100mA, 30V dual Schottky diode
(SOT23) common anode
Central Semiconductor CMPSH-3A
JU1, JU2
2
4-pin headers
JU3, JU4
2
3-pin headers
JU5, JU6, JU12,
JU14
0
Not installed (short jumpers)
L1, L2
2
5.7µH, 5.8A, 10.3mΩ power inductors
Sumida CDEP105-5R7NC
N1, N3
2
n-channel MOSFETs (8-pin SO)
Fairchild FDS6612A
N2, N4
2
n-channel MOSFETs (8-pin SO)
Fairchild FDS6670A
R1, R2
2
0.007Ω ±1%, 1/2W resistors (2010)
IRC LR2010-01-R0007-F or
Dale WSL-2010-R0007F
R3
1
20Ω ±5% resistor (0805)
R4, R14
2
100kΩ ±5% resistors (0603)
R5, R6
0
Not installed (short PC trace) (0603)
R10, R16
2
3Ω ±5% resistors (0603)
R19–R24
0
Not installed (0603)
U1
1
MAX8716ETG (24-pin thin QFN
4mm x 4mm)
—
4
Shunts
—
1
MAX8716 rev B PC board
________________________________________________________________ Maxim Integrated Products
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.
1
Evaluates: MAX8716
General Description
Evaluates: MAX8716
MAX8716 Evaluation Kit
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Central
Semiconductor
631-435-1110
www.centralsemi.com
Dale-Vishay
402-564-3131
www.vishay.com
Fairchild
888-522-5372
www.fairchildsemi.com
IRC
361-992-7900
www.irctt.com
Kemet
864-963-6300
www.kemet.com
Murata
770-436-1300
www.murata.com
Nihon
847-843-7500
www.niec.co.jp
Sanyo
619-661-6835
www.sanyodevice.com
Sumida
847-545-6700
www.sumida.com
Taiyo Yuden
800-348-2496
www.t-yuden.com
TDK
847-803-6100
www.component.tdk.com
Toshiba
408-526-2459
www.toshiba.com
Note: Indicate that you are using the MAX8716 when contacting
these component suppliers.
Quick Start
(d) JU2 pins 1 and 2 (SKIP2 high, OUT2 in forcedPWM mode)
3) Turn on the battery power 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 VOUT1 = +3.3V
and VOUT2 = +5.0V
Detailed Description
Jumper Settings
Table 1. Jumper JU4 Functions
(Output Voltage OUT1 Control)
JU4
ON1 PIN
OUT1
OUT1 is enabled,
VOUT1 = 3.3V
1 and 2
(default)
Connected to VDD
2 and 3
Connected to GND
OUT1 is disabled
Not
installed
ON1 must be driven
by an external signal
connected to ON1 pad
OUT1 operation depends
on the external ON1
signal levels
Recommended Equipment
Before you begin, the following equipment is needed. Do
not turn on the power until all connections are made:
• +6V to +24V power supply, battery, or notebook AC
adapter
Table 2. Jumper JU3 Functions
(Output Voltage OUT2 Control)
JU3
ON2 PIN
OUT2
•
DC bias power supply, +5V at 100mA
•
Dummy loads capable of sinking 5A each
1 and 2
(default)
Connected to VDD
OUT2 is enabled,
VOUT2 = 5.0V
•
Digital multimeters (DMMs)
2 and 3
Connected to GND
OUT2 is disabled
Not
installed
ON2 must be driven
by an external signal
connected to ON2 pad
OUT2 operation depends
on the external ON2
signal levels
•
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) JU4 pins 1 and 2 (ON1 high, OUT1 (+3.3V)
enabled)
(b) JU3 pins 1 and 2 (ON2 high, OUT2 (+5.0V)
enabled)
(c) JU1 pins 1 and 2 (SKIP1 high, OUT1 in forcedPWM mode)
2
Table 3. Jumper JU1 Functions
(Low-Noise-Mode Control for OUT1)
JU1
SKIP1 PIN
OPERATIONAL MODE
1 and 2
(default)
Connected to VDD
OUT1 is in forced-PWM
mode (fixed frequency)
1 and 4
Connected to REF
OUT1 is in low-noise
mode
1 and 3
Connected to GND
OUT1 is in pulse-skipping
mode
_______________________________________________________________________________________
MAX8716 Evaluation Kit
JU2
SKIP2 PIN
OPERATIONAL MODE
1 and 2
(default)
Connected to VDD
OUT2 is in forced-PWM
mode (fixed frequency)
1 and 4
Connected to REF
OUT2 is in low-noise
mode
1 and 3
Connected to GND
OUT2 is in pulse-skipping
mode
Evaluating Other Output Voltages
The MAX8716 provides a fixed +3.3V output (OUT1) when
FB1 is connected to VCC (R6 = 0) and a fixed +5.0V output (OUT2) when FB2 is connected to VCC (R5 = 0).
OUT1 and OUT2 can also be adjusted from +1.0V to
+5.5V by using a resistive voltage-divider formed by
R21, R22 (R6 = open) and R19, R20 (R5 = open). The
MAX8716 regulates FB1 and FB2 to a fixed reference
voltage (+1.0V).
The adjusted output voltages are:
VOUT1 = VFB1 (1 + R21 / R22)
where VFB1 = +1.0V, and:
VOUT2 = VFB2 (1 + R19 / R20)
where VFB2 = +1.0V.
_______________________________________________________________________________________
3
Evaluates: MAX8716
Table 4. Jumper JU2 Functions
(Low-Noise-Mode Control for OUT2)
3.3V AT 5A
VOUT2
4
PGND
VIN
C11
1µF
3.3V
VIN
C4
OPEN
L1
5.7µH
C1
10µF
25V
PGOOD2
C5
220µF
4V
R1
0.007Ω
C24
OPEN
R23
OPEN
D1
JU5
JU6
VDD
R14
100kΩ
1
2
JU1
1
VDD
3
JU4
3
4
2
VDD
2
1
3
REF
C9
1µF
19
20
1
4
7
5
2
22
21
17
C10
0.1µF 18
R10
3Ω
VCC
3
JU2
1
7
8 N2
FDS6670A
4
4
2
6
5
BST1
1
3
2
7
8 N1
FDS6612A BST1
4
6
5
C2
OPEN
R3
20Ω
REF
VDD
U1
15
VDD
Figure 1. MAX8716 EV Kit Schematic
_______________________________________________________________________________________
3
REF
CSL2
CSH2
GND
DL2
LX2
DH2
BST2
C12
0.22µF
FB1
FB2
ON2
PGOOD1
REF
MAX8716
C14
1µF
PGOOD2
ON1
SKIP1
CSL1
CSH1
DL1
LX1
DH1
BST1
VCC
SKIP2
VDD
23
8
6
24
9
10
16
14
13
12
11
VDD
2
JU3
3
1
VDD
1
3
6
5
VOUT2
R20
OPEN
R22
OPEN
R21
OPEN
VOUT1
R6
SHORT
VCC
PGOOD1
R5
SHORT
JU14
2
R2
0.007Ω
C25
OPEN
R24
OPEN
4
7
N3 8
FDS6612A
BST1
BST2
D2
JU12
BST2
R4
100kΩ
R19
OPEN
VDD
2
7
N4 8
FDS6670A
4
C17
0.1µF
R16
3Ω
2
L
R
VCC
C6
OPEN
L2
5.7µH
1
3
6
5
3
VIN
D3
C3
10µF
25V
C7
150µF
6.3V
VOUT1
1
C18
1µF
PGND
5V AT 5A
VOUT1
Evaluates: MAX8716
MAX8716 Evaluation Kit
MAX8716 Evaluation Kit
Evaluates: MAX8716
Figure 2. MAX8716 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX8716 EV Kit PC Board Layout—Component Side
Figure 4. MAX8716 EV Kit PC Board Layout—Internal Layer 2,
PGND/Signal Plane
Figure 5. MAX8716 EV Kit PC Board Layout—Internal Layer 3,
PGND/GND Layer
_______________________________________________________________________________________
5
Evaluates: MAX8716
MAX8716 Evaluation Kit
Figure 6. MAX8716 EV Kit PC Board Layout—Solder Side
Figure 7. MAX8716 EV Kit Component Placement Guide—
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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maxim Integrated Products
Springer
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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