MAX1953EVKIT [MAXIM]
Evaluation Kit for the MAX1953/MAX1954/MAX1957 ; 评估板MAX1953 / MAX1954 / MAX1957\n
| 型号： | MAX1953EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX1953/MAX1954/MAX1957
|
| 文件： | 总8页 (文件大小：195K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2516; Rev 0; 7/02
MAX1953 Evaluation Kit
General Description
Features
The MAX1953 evaluation kit (EV kit) demonstrates three
low-cost, buck controller application circuits. The
MAX1953 application circuit features an adjustable current
limit. The 1MHz switching frequency renders a small foot-
print. The MAX1954 application circuit operates from a 3V
to 13.2V input voltage range and is adjustable indepen-
dent of the supply voltage. The MAX1954 switches at
300kHz and boasts 93% efficiency with the supplied com-
ponents. The MAX1957 application circuit demonstrates
ꢀ Low-Cost Current-Mode Controllers
ꢀ Fixed-Frequency Pulse-Width Modulation (PWM)
ꢀ 0.8V (min) Output Voltage for MAX1953/MAX1954
ꢀ Operates from Low 3V Input Voltage
ꢀ MAX1953
1MHz Switching Frequency
Small Component Size, Low Cost
Adjustable Current Limit
ꢀ MAX1954
3V to 13.2V Input Voltage
93% Efficiency
300kHz Switching Frequency
ꢀ MAX1957
the ability to track V
. The MAX1957 switches at
REFIN
300kHz and is capable of sinking and sourcing up to 3A.
This fully tested EV kit comes with the MAX1953 and
MAX1954 evaluation circuits assembled. The MAX1953
EV kit also has complete layout to evaluate the MAX1957.
Request free samples of the MAX1957 from Maxim to
evaluate this circuit.
0.4V to 0.86V Output Voltage Range
IN
Sinking and Sourcing Capability of Up to 3A
Component List
Output Voltage Tracks V
REFIN
ꢀ Shutdown Feature
MAX1953 Application Circuit
ꢀ All N-Channel MOSFETs Design for Low Cost
ꢀ No Current-Sense Resistor Needed
ꢀ Internal Digital Soft-Start
DESIGNATION QTY
DESCRIPTION
0.1µF 10ꢀ% ꢁ0ꢂ ꢃX7
ceramic capacitor
Taiyo Yuden UMK10XBJ104KA
C8
1
2
ꢀ Surface-Mount Components
10µF% 4ꢂ ꢃꢁ7 ceramic capacitors
Taiyo Yuden AMK212BJ106MG
C9% C10
ꢀ Thermal-Overload Protection
ꢀ Small 10-Pin µMAX Package
2X0pF% 10ꢂ ꢃX7 ceramic capacitor
Kemet C0402C2X1M87AC
C11
C12
1
1
2
ꢀ MAX1953/MAX1954 Circuit Assembled and Tested
Not installed
10µF% 6.3ꢂ ꢃꢁ7 ceramic capacitors
Taiyo Yuden JMK316BJ106ML
C13% C14
4.XµF% 6.3ꢂ ꢃꢁ7 ceramic capacitor
Taiyo Yuden JMK212BJ4XꢁMG
Ordering Information
C1ꢁ
C16
D2
1
1
1
1
1
1
PART
TEMP RANGE
IC PACKAGE
120pF% ꢁ0ꢂ COG ceramic capacitor
Murata G7M188ꢁC1H121J
MAX1953EVKIT
-40°C to +85°C
10 µMAX
Schottky diode
Central Semiconductor CMPSH1-4
Jumper% SIP3% 3-pin header
Digi-Key S1012-3-ND or equivalent
Recommended Equipment
3V to 6V at +7A DC power supply or battery
Digital multimeter (DMM)
JU3
JU4
L2
•
•
•
Jumper% SIP2% 2-pin header
Digi-Key S1012-2-ND or equivalent
Ammeter (optional)
1µH% 3.6A% 20m inductor
Toko 81XFY-170M
________________________________________________________________ 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.
MAX1953 Evaluation Kit
Component List (continued)
MAX1954 Application Circuit (continued)
MAX1953 Application Circuit (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
Shunt
1000pF% 10ꢂ ceramic capacitor
Kemet C0402C102M87AC
None
N2
2
1
Cꢁ
C6
1
1
1
1
2
1
1
Digikey S9000-ND or equivalent
Dual% 20ꢂ% 9.4A% 0.014 MOSFET
Fairchild FDS6898A
4XpF% 10ꢂ ceramic capacitor
Kemet C0402C4X0K8GAC
74
7ꢁ
76
U2
1
1
1
1
16.9k
8.06k
33k
1ꢀ resistor
1ꢀ resistor
ꢁꢀ resistor
0.22µF% 10ꢂ ꢃX7 ceramic capacitor
Kemet C0603C224M87AC
CX
Schottky diode
Central Semiconductor CMPSH1-4
D1
MAꢃ19ꢁ3EUB
Jumpers% SIP2% 2-pin headers
Digi-Key S1012-2-ND or equivalent
JU1% JU2
L1
MAX1954 Application Circuit
DESIGNATION QTY
DESCRIPTION
2.XµH% 6.6A% 12m inductor
Coilcraft DO3316P-2X2HC
10µF% 16ꢂ ꢃꢁ7 ceramic capacitor
Taiyo Yuden EMK32ꢁBJ106MN
C1
C2
C3
1
1
1
Dual% 20ꢂ% X.ꢁA% 0.018 MOSFET
Fairchild FDS6890A
N1
0.1µF 10ꢀ% 16ꢂ ꢃX7 ceramic capacitor
Taiyo Yuden #EMK10XBJ104KA
71
72
73
1
1
1
9.09k
8.06k
62k
1ꢀ resistor
1ꢀ resistor
ꢁꢀ resistor
180µF% 4ꢂ% 1ꢁm SP capacitor
Panasonic EEFUE0G1817
10µF% 4ꢂ ꢃꢁ7 ceramic capacitor
Taiyo Yuden AMK212BJ106MG%
(Not installed)
Shunt
None
U1
2
1
C4
1
Digikey S9000-ND or equivalent
MAꢃ19ꢁ4EUB
Component Suppliers
SUPPLIER
COMPONENT
Diodes
PHONE
WEBSITE
www.centralsemi.com
www.coiltronics.com
www.fairchildsemi.com
www.kemet.com
Central Semiconductor
Coiltronics
ꢁ16-43ꢁ-1110
ꢁ61-Xꢁ2-ꢁ000
408-X21-2181
864-963-6300
XX0-436-1300
408-ꢁX3-41ꢁ0
800-X4ꢁ-86ꢁ6
Inductors
Fairchild Semiconductor
Kemet
MOSFETs
Capacitors
Capacitors
Capacitors
Inductors
Murata
www.murata.com
Taiyo Yuden
Toko
www.t-yuden.com
www.toko.com
2) ꢂerify that the shunt is in place at JU1 between
positions 1 and 2.
Quick Start
The MAꢃ19ꢁ3/MAꢃ19ꢁ4 application circuits are fully
assembled and tested. Follow these steps to verify
board operation:
3) ꢂerify that there is no shunt at JU2.
4) Connect the positive lead of the power supply to
the ꢂIN pad and connect the negative lead of the
power supply to GND0.
MAX1954
1) Preset the DC power supply to 3ꢂ. Turn off the
power supply.
ꢁ) Turn on the power supply.
2
_______________________________________________________________________________________
MAX1953 Evaluation Kit
6) ꢂerify that the voltage at ꢂOUT is 1.Xꢂ.
Setting the Current Limit (MAX1953)
Use JU3 to set the short-circuit current-limit threshold for
the MAꢃ19ꢁ3. Short JU3 between pins 1 and 2 for a
10ꢁmꢂ threshold% between 2 and 3 for 320mꢂ threshold%
or remove the shunt from JU3 for a 210mꢂ threshold.
X) Gradually increase the input voltage up to ꢁ.ꢁꢂ%
verifying that the output voltage remains at 1.Xꢂ.
8) Connect a ꢁA load between ꢂOUT and GND0.
9) ꢂerify that the voltage at ꢂOUT is 1.Xꢂ.
Evaluating the MAX1957
MAX1953
1) Preset the DC power supply to 3ꢂ. Turn off the
power supply.
The MAꢃ19ꢁX circuit comes unpopulated on the
MAꢃ19ꢁ3 Eꢂ kit. Table 1 is a bill of materials for the
MAꢃ19ꢁX circuit. To evaluate the MAꢃ19ꢁX% request a
free sample of the MAꢃ19ꢁX from Maxim and populate
the MAꢃ19ꢁ3 Eꢂ kit board with the components specified.
2) Ensure that there is a shunt between positions 1
and 2 at JU3.
3) ꢂerify that there is no shunt at JU4.
Setting the Output Voltage
The MAꢃ19ꢁX’s output voltage tracks the voltage at
7EFIN. Populate 7X and 78 with 2k resistors to set the
ratio to 1/2. Set a different input/output voltage ratio with
the following equation:
4) Connect the positive lead of the power supply to
the ꢂIN1 pad and connect the negative lead to the
GND1 pad.
ꢁ) Turn on the power supply.
6) ꢂerify that the voltage at ꢂOUT1 is 2.ꢁꢂ.
ꢂ
ꢂ
x (78/(7X 78))
OUT2
7EFIN
X) Gradually increase the input voltage up to ꢁ.ꢁꢂ veri-
fying that the output voltage remains at 2.ꢁꢂ.
Jumper Settings
JU2, JU4, and JU5 Functions
(Shutdown Mode)
8) Connect a 3A load between ꢂOUT1 and GND2.
9) ꢂerify that the voltage at ꢂOUT1 is 2.ꢁꢂ.
Detailed Description
The MAꢃ19ꢁ3/MAꢃ19ꢁ4/MAꢃ19ꢁX feature a shutdown
mode to minimize the quiescent current. To shut down
the MAꢃ19ꢁ3% place a shunt between pins 1 and 2 on
JU4. To shut down the MAꢃ19ꢁ4% place a shunt
between pins 1 and 2 on JU2. To shutdown the
MAꢃ19ꢁX% place a shunt between pins 1 and 2 on JUꢁ.
Evaluating Other Output Voltages
The MAꢃ19ꢁ3/MAꢃ19ꢁ4 application circuits come
assembled with output voltages of 2.ꢁꢂ and 1.Xꢂ%
respectively. The MAꢃ19ꢁ3/MAꢃ19ꢁ4 are capable of
adjustable output voltage settings from 0.8ꢂ to 0.86ꢂ .
IN
To adjust the output voltage% place a 1ꢀ% 8.06k resistor
at 72 (7ꢁ) and a 1ꢀ resistor at 71 (74) with a value
corresponding to the equation:
JU1 Function (HSD Control, MAX1954)
The HSD and IN pins on the MAꢃ19ꢁ4 can be connect-
ed when using input voltages lower than ꢁ.ꢁꢂ. Place a
shunt on JU1 to connect the HSD and IN pins.
71 (74) = 8.06 x 103 x ((ꢂ
/0.8) - 1)
OUT
ꢂ
can not exceed ꢂ .
IN
OUT
JU3 Function (ILIM Control, MAX1953)
Use JU3 to select the current-limit threshold for the
MAꢃ19ꢁ3. See Table 2 for the possible positions of JU3.
The compensation network may need to be optimized
for each output voltage. 7efer to the Stability and
Compensation section of the MAꢃ19ꢁ3/MAꢃ19ꢁ4/
MAꢃ19ꢁX data sheet for the method to calculate the
compensation components.
Input Capacitance Guidelines
An oscillation may occur in the input voltage when
using the MAꢃ19ꢁ3 Eꢂ kit that shows up on the output.
This is typically due to long input leads. An LC “tank”
circuit is formed with the inductance of the input leads
and the input capacitance. Use very short leads or add
a high equivalent series resistance (ES7) capacitor
(aluminum electrolytic or tantalum) at the input to stop
this oscillation. This “detunes” the LC tank circuit and
effectively stops the oscillation.
Using Separate Power Supplies
(MAX1954)
Two power supplies can be used with the MAꢃ19ꢁ4 in
order to extend the input voltage range to 13.2ꢂ.
7emove the shunt on JU1 to use separate power sup-
plies for ꢂIN and ꢂHSD. If the input voltage required is
between 3ꢂ and ꢁ.ꢁꢂ% ꢂIN and ꢂHSD can be connected
together through JU1.
_______________________________________________________________________________________
3
MAX1953 Evaluation Kit
Table 1. MAX1957 Bill of Materials
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
2.XµH% 6.6A%12m inductor
Coilcraft DO3316P-2X2HC
2X0µF% 2ꢂ% 1ꢁm polymer capacitors
Panasonic EEFUE0E2X17
L3
N3
1
1
1
C1X% C18% C19
3
1
1
1
Dual% 20ꢂ% X.ꢁA% 0.018 MOSFET
Fairchild FDS6890A
10µF% 6.3ꢂ ꢃꢁ7 ceramic capacitor
Taiyo Yuden JMK316BJ106ML
C20
C21
C22
Shunt
4.XµF% 6.3ꢂ ꢃꢁ7 ceramic capacitor
Taiyo Yuden JMK212BJ4XꢁMG
None
Digi-Key S9000-ND or equivalent
7X% 78
79
2
1
1
1
2k
1ꢀ resistors
ꢁꢀ resistor
4X0pF% 10ꢂ ceramic capacitor
Kemet C0402C4X1M87AC
ꢁ1.1k
710
U3
10k ꢁꢀ resistor
MAꢃ19ꢁXEUB
0.1µF 10ꢀ% ꢁ0ꢂ ꢃX7 ceramic
capacitors
C23% C24
2
Taiyo Yuden UMK10XBJ104KA
22µF% 6.3ꢂ ꢃꢁ7 ceramic capacitors
Taiyo Yuden JMK316BJ226ML
C2ꢁ% C26% C2X
3
1
1
1
1
68pF% 10ꢂ ceramic capacitor
Kemet C0402C680K8GAC
C28
C29
D3
Table 2. JU3 Positions
1ꢁ00pF% ꢁ0ꢂ ꢃX7 ceramic capacitor
Murata G7M1887X1H1ꢁ2K
SHUNT
ILIM
V
(mV)
CS
LOCATION
Between 1 and 2
None
Connected to GND
10ꢁ
Schottky diode
Central Semiconductor CMPSH1-4
Floating
210
320
Between 2 and 3
Connected to IN
Jumper% SIP2% 2-pin header
Digikey S1012-2-ND or equivalent
JUꢁ
VHSD
5.5V TO 13.2V
JU1
1
2
C1
10 F
VIN
5V
D1
N1
FAIRCHILD
FDS6890A
CMPSH1-4
HSD
BST
IN
L1
2.7 H, 6.6A
COILCRAFT DO3316P-272HG
C7
0.22 F
DH
LX
N
VOUT
1.7V AT 5A
C2
0.1 F
U1
MAX1954
R1
9.09k
N
DL
COMP/
SHDN
2
JU2
1
C3
C4
R3
62k
C5
C6
47pF
180 F OPEN
POLYMER
PGND
FB
1000pF
R2
8.06k
GND
Figure 1. MAX1954 EV Kit Schematic
4
_______________________________________________________________________________________
MAX1953 Evaluation Kit
VIN1
3V to 3.6V
C13
10 F
C15
4.7 F
C14
10 F
D2
CMPSH1-4
N2
FAIRCHILD
FDS6898A
3
2
1
IN
BST
JU3
ILIM
L2
U2
DH
LX
N
N
VOUT1
2.5V AT 3A
1 H, 3.6A
C8
TOKO 817FY-1ROM
0.1 F
MAX1953
R4
16.9k
DL
PGND
FB
COMP/
SHDN
2
JU4
1
C9
C10
R6
33k
C11
270pF
C12
OPEN
10 F 10 F
R5
8.06k
GND
C16
120pF
Figure 2. MAX1953 EV Kit Schematic
VIN2
3V to 3.6V
C20
10 F
D3
CMPSH1-4
C25
22 F
C26
22 F
C27
22 F
C21
4.7 F
N3
FAIRCHILD
FDS6890A
REFIN
2.5V
R7
2k
IN
BST
REFIN
L3
U3
N
N
VOUT2
1.25V AT 3A
DH
LX
2.7 H, 6.6A
C23
0.1 F
R8
2k
C24
COILCRAFT DO3316-272HC
0.1 F
MAX1957
C29
1500pF
DL
PGND
FB
COMP/
SHDN
2
JU5
C17
C18
C19
R9
51.1k
1
C22
470pF
C28
68pF
270 F 270 F 270 F
POLYMER
R10
10k
GND
Figure 3. MAX1957 EV Kit Schematic
_______________________________________________________________________________________
5
MAX1953 Evaluation Kit
1.0"
Figure 4. MAX1953 EV Kit Component Placement Guide—Top Silkscreen
6
_______________________________________________________________________________________
MAX1953 Evaluation Kit
1.0"
Figure 5. MAX1953 EV Kit PC Board Layout—Component Side
_______________________________________________________________________________________
7
MAX1953 Evaluation Kit
1.0"
Figure 6. MAX1953 EV Kit PC Board Layout—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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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