2024年5月11日发(作者：江梦桃)
元器件交易网
19-3351; Rev 0; 7/04
MAX1954A Evaluation Kit
General DescriptionFeatures
The MAX1954A evaluation kit (EV kit) demonstrates the
♦Current-Mode Controller
MAX1954A buck controller application circuit. The EV
kit generates a 1.5V output voltage at load currents up
♦300kHz Fixed-Frequency PWM
to 5A from a 10.8V to 13.2V input voltage range inde-
♦0.8V Minimum Output Voltage
pendent of the IC supply voltage. The MAX1954A
♦10.8V to 13.2V Input Voltage Range
switches at 300kHz and has better than 90% efficiency
with the supplied components.
♦>90% Efficiency
The EV kit comes fully assembled and tested.
♦Output Shutdown Mode
♦All n-Channel MOSFET Design for Low Cost
♦No Current-Sense Resistor Needed
♦Foldback Short-Circuit Protection
♦Thermal-Overload Protection
♦Small 10-Pin µMAX
®
Package
♦Assembled and Tested
Ordering Information
µMAX is a registered trademark of Maxim Integrated Products, Inc.
PARTTEMP RANGEIC PACKAGE
MAX1954AEVKIT0°C to +70°C10 µMAX
Component List
DESIGNATIONQTYDESCRIPTION
DESIGNATIONQTYDESCRIPTION
22µF, 16V X5R ceramic capacitor
C100Not installed (0603)
C11
(1210)
TDK C3225X5R1C226K
D11
Schottky diode (SOT23-F)
Central Semiconductor CMPSH1-4
0.22µF, 10V X 7R cer am i c cap aci tor
C21
( 0603)
2- p in head er s
Kem et C 0603C 224M 8RAC
JU1, JU22
S ul li ns P TC 36S AAN
( 36- p in str i p , cut to si ze as need ed )
1µF, 10V X7R ceramic capacitor
C31
(0603)
L11
2.7µH, 6.6A, 12mΩ inductor
TDK C1608X7R1A105K
Coilcraft DO3316P-272HC
180µF, 2V, 9mΩ SP capacitor
Dual n-MOSFET 20V, 7.5A, 0.018Ω
C41
Panasonic EEFSX0D181R
N11
(8-pin SO)
Fairchild FDS6890A
C50Not installed (0603)
R117.15kΩ ±1% resistor (0603)
18pF ±5%, 50V C0H ceramic
C61
capacitor (0402)
R218.06kΩ ±1% resistor (0603)
Taiyo Yuden UMK105CH180JW
R3182kΩ ±5% resistor (0603)
470pF ±10%, 50V X7R ceramic
R412Ω ±5% resistor (0603)
C71
capacitor (0402)
R50Not installed (0603)
Taiyo Yuden UMK105BJ471KW
U11MAX1954AEUB
0.1µF ±10%, 16V X5R ceramic
None2Shunts
C81
capacitor (0603)
Taiyo Yuden EMK107BJ104KA
1500pF, 50V X7R ceramic
C91
capacitor (0603)
TDK C1608X7R1H152K
________________________________________________________________Maxim Integrated Products1
For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at
1-888-629-4642, or visit Maxim’s website at .
Evaluates: MAX1954A
元器件交易网
MAX1954A Evaluation Kit
E
v
a
l
u
a
t
e
s
:
M
A
X
1
9
5
4
A
Component Suppliers
SUPPLIER
Central Semiconductor
Coilcraft
Fairchild Semiconductor
Kemet
Taiyo Yuden
TDK
COMPONENT
Diodes
Inductors
MOSFETs
Capacitors
Capacitors
Capacitors
PHONE NUMBER
516-435-1110
800-322-2645
408-721-2181
864-963-6300
408-573-4150
81-3-5201-7200
WEBSITE
Note:Indicate you are using the MAX1954A when contacting these manufacturers.
Recommended Equipment
•
•
•
•
•
15V at 1A DC variable power supply
5V at 100mA power supply
Digital multimeter (DMM)
5A load
Ammeter (optional)
Detailed Description
Evaluating Other Output Voltages
The MAX1954A EV kit comes preset to a 1.5V output
voltage. The output of the MAX1954A is adjustable down
to 0.8V. To adjust the output voltage, place a 1% resistor
at R1 with a value corresponding to the equation:
Quick Start
The MAX1954A application circuit is fully assembled
and tested. Follow these steps to verify board operation:
1)Preset the DC power supplies to 12V and 5V. Turn
off the power supplies. Do not turn on the power
supplies until all connections are complete.
2)Remove the shunt from JU1 and JU2.
3)Connect the positive lead of the 5V power supply to
the VIN pad on the EV kit and connect the negative
lead of the power supply to the GND pad on the
EV kit.
4)Connect the positive lead of the 12V power supply
to the VHSD pad on the EV kit and connect the neg-
ative lead of the power supply to the GND pad on
the EV kit.
5)Connect the positive lead of the DMM to the VOUT
pad on the EV kit and connect the negative lead of
the DMM to the GND pad on the EV kit.
6)Turn on the power supplies.
7)Verify that the voltage at VOUT is 1.5V ±2.5%.
8)Connect a 5A load between VOUT and GND.
9)Verify that the voltage at VOUT is 1.5V ±2.5%.
R1 = 8.06 x 10
3
x ((V
OUT
/ 0.8) - 1)
Note that V
OUT
cannot exceed V
IN
and is limited by the
maximum duty cycle of the MAX1954A.
Refer to the MAX1954A data sheet for information on
selecting output inductor, capacitor, and compensation
components to optimize the circuit for different output
voltages.
Using a Single Power Supply
If the input source is between 3V to 5.5V, install a shunt
on JU1 (to connect VHSD and VIN), and connect the
power supply between the VHSD pad and the GND pad
on the EV kit. Refer to the MAX1954A data sheet for
information on selecting the inductor, capacitors, and
compensation components for optimum performance.
Jumper Settings
Jumper JU1 Function
(HSD Control)
Connect HSD to IN when using input voltages lower
than 5.5V. Place a shunt on JU1 to connect HSD to IN.
Jumper JU2 Function
(Output Shutdown Mode)
The MAX1954A features an output shutdown mode to
minimize the quiescent current. To shut down the out-
put, place a shunt between pins 1 and 2 on JU2. For
normal operation remove the shunt from JU2.
2_______________________________________________________________________________________
2024年5月11日发(作者：江梦桃)
元器件交易网
19-3351; Rev 0; 7/04
MAX1954A Evaluation Kit
General DescriptionFeatures
The MAX1954A evaluation kit (EV kit) demonstrates the
♦Current-Mode Controller
MAX1954A buck controller application circuit. The EV
kit generates a 1.5V output voltage at load currents up
♦300kHz Fixed-Frequency PWM
to 5A from a 10.8V to 13.2V input voltage range inde-
♦0.8V Minimum Output Voltage
pendent of the IC supply voltage. The MAX1954A
♦10.8V to 13.2V Input Voltage Range
switches at 300kHz and has better than 90% efficiency
with the supplied components.
♦>90% Efficiency
The EV kit comes fully assembled and tested.
♦Output Shutdown Mode
♦All n-Channel MOSFET Design for Low Cost
♦No Current-Sense Resistor Needed
♦Foldback Short-Circuit Protection
♦Thermal-Overload Protection
♦Small 10-Pin µMAX
®
Package
♦Assembled and Tested
Ordering Information
µMAX is a registered trademark of Maxim Integrated Products, Inc.
PARTTEMP RANGEIC PACKAGE
MAX1954AEVKIT0°C to +70°C10 µMAX
Component List
DESIGNATIONQTYDESCRIPTION
DESIGNATIONQTYDESCRIPTION
22µF, 16V X5R ceramic capacitor
C100Not installed (0603)
C11
(1210)
TDK C3225X5R1C226K
D11
Schottky diode (SOT23-F)
Central Semiconductor CMPSH1-4
0.22µF, 10V X 7R cer am i c cap aci tor
C21
( 0603)
2- p in head er s
Kem et C 0603C 224M 8RAC
JU1, JU22
S ul li ns P TC 36S AAN
( 36- p in str i p , cut to si ze as need ed )
1µF, 10V X7R ceramic capacitor
C31
(0603)
L11
2.7µH, 6.6A, 12mΩ inductor
TDK C1608X7R1A105K
Coilcraft DO3316P-272HC
180µF, 2V, 9mΩ SP capacitor
Dual n-MOSFET 20V, 7.5A, 0.018Ω
C41
Panasonic EEFSX0D181R
N11
(8-pin SO)
Fairchild FDS6890A
C50Not installed (0603)
R117.15kΩ ±1% resistor (0603)
18pF ±5%, 50V C0H ceramic
C61
capacitor (0402)
R218.06kΩ ±1% resistor (0603)
Taiyo Yuden UMK105CH180JW
R3182kΩ ±5% resistor (0603)
470pF ±10%, 50V X7R ceramic
R412Ω ±5% resistor (0603)
C71
capacitor (0402)
R50Not installed (0603)
Taiyo Yuden UMK105BJ471KW
U11MAX1954AEUB
0.1µF ±10%, 16V X5R ceramic
None2Shunts
C81
capacitor (0603)
Taiyo Yuden EMK107BJ104KA
1500pF, 50V X7R ceramic
C91
capacitor (0603)
TDK C1608X7R1H152K
________________________________________________________________Maxim Integrated Products1
For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at
1-888-629-4642, or visit Maxim’s website at .
Evaluates: MAX1954A
元器件交易网
MAX1954A Evaluation Kit
E
v
a
l
u
a
t
e
s
:
M
A
X
1
9
5
4
A
Component Suppliers
SUPPLIER
Central Semiconductor
Coilcraft
Fairchild Semiconductor
Kemet
Taiyo Yuden
TDK
COMPONENT
Diodes
Inductors
MOSFETs
Capacitors
Capacitors
Capacitors
PHONE NUMBER
516-435-1110
800-322-2645
408-721-2181
864-963-6300
408-573-4150
81-3-5201-7200
WEBSITE
Note:Indicate you are using the MAX1954A when contacting these manufacturers.
Recommended Equipment
•
•
•
•
•
15V at 1A DC variable power supply
5V at 100mA power supply
Digital multimeter (DMM)
5A load
Ammeter (optional)
Detailed Description
Evaluating Other Output Voltages
The MAX1954A EV kit comes preset to a 1.5V output
voltage. The output of the MAX1954A is adjustable down
to 0.8V. To adjust the output voltage, place a 1% resistor
at R1 with a value corresponding to the equation:
Quick Start
The MAX1954A application circuit is fully assembled
and tested. Follow these steps to verify board operation:
1)Preset the DC power supplies to 12V and 5V. Turn
off the power supplies. Do not turn on the power
supplies until all connections are complete.
2)Remove the shunt from JU1 and JU2.
3)Connect the positive lead of the 5V power supply to
the VIN pad on the EV kit and connect the negative
lead of the power supply to the GND pad on the
EV kit.
4)Connect the positive lead of the 12V power supply
to the VHSD pad on the EV kit and connect the neg-
ative lead of the power supply to the GND pad on
the EV kit.
5)Connect the positive lead of the DMM to the VOUT
pad on the EV kit and connect the negative lead of
the DMM to the GND pad on the EV kit.
6)Turn on the power supplies.
7)Verify that the voltage at VOUT is 1.5V ±2.5%.
8)Connect a 5A load between VOUT and GND.
9)Verify that the voltage at VOUT is 1.5V ±2.5%.
R1 = 8.06 x 10
3
x ((V
OUT
/ 0.8) - 1)
Note that V
OUT
cannot exceed V
IN
and is limited by the
maximum duty cycle of the MAX1954A.
Refer to the MAX1954A data sheet for information on
selecting output inductor, capacitor, and compensation
components to optimize the circuit for different output
voltages.
Using a Single Power Supply
If the input source is between 3V to 5.5V, install a shunt
on JU1 (to connect VHSD and VIN), and connect the
power supply between the VHSD pad and the GND pad
on the EV kit. Refer to the MAX1954A data sheet for
information on selecting the inductor, capacitors, and
compensation components for optimum performance.
Jumper Settings
Jumper JU1 Function
(HSD Control)
Connect HSD to IN when using input voltages lower
than 5.5V. Place a shunt on JU1 to connect HSD to IN.
Jumper JU2 Function
(Output Shutdown Mode)
The MAX1954A features an output shutdown mode to
minimize the quiescent current. To shut down the out-
put, place a shunt between pins 1 and 2 on JU2. For
normal operation remove the shunt from JU2.
2_______________________________________________________________________________________