19-2101; Rev 0; 8/01
MAX1845 Evaluation Kit
General Description
The MAX1845 evaluation kit (EV kit) demonstrates the
MAX1845鈥檚 standard application circuit. This DC-DC
converter steps down high-voltage batteries and/or AC
adapters, generating precision, low-voltage rails for use
as chipset, DRAM supplies, CPU core, and IO supplies.
The MAX1845 EV kit provides dual 1.8V and 2.5V output
voltages from a 7V to 22V battery input range. It delivers
up to 4A output current for the 2.5V output and 7A for
the 1.8V output, with greater than 90% efficiency. The
EV kit operates at 255kHz/345kHz switching frequency
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 1.0V to 5.5V range by changing feedback resistors
R1鈥揜4.
o
7V to 22V Input Voltage Range
o
1.8V and 2.5V Output Voltages
o
1.0V to 5.5V Adjustable Outputs
o
4A Output Current (2.5V Output)
o
7A Output Current (1.8V Output)
o
Adjustable Current-Limit Threshold
o
255kHz/345kHz Switching Frequency
o
Power-Good Output
o
Over- and Undervoltage Protection
o
28-Pin QSOP Package
o
Low-Profile Components
o
Fully Assembled and Tested
Features
Evaluates: MAX1845
Ordering Information
PART
MAX1845EVKIT
TEMP. RANGE
0 C to +70 C
o
o
IC PACKAGE
28 QSOP
Component List
DESIGNATION
C1鈭扖5
QTY
5
DESCRIPTION
10碌F, 25V ceramic capacitors
(1812)
Taiyo Yuden TMK432BJ106KM or
TDK C4532X5R1E106M
470碌F, 6.3V, 30m鈩?low-ESR
tantalum capacitors
Kemet T510X477M006AS
0.1碌F ceramic capacitors (0805)
1碌F, 10V X5R ceramic capacitor
(0805)
Taiyo Yuden LMK212BJ105MG
3.3碌F, 10V X5R ceramic capacitor
(1206)
Taiyo Yuden LMK316BJ335ML
Not installed
0.22碌F ceramic capacitor (1206)
4.7碌F, 16V tantalum capacitor
Sprague 595D475X0016A2B
100mA, 30V dual Schottky diode
Central Semiconductor CMPSH-3A
1A, 30V Schottky diodes
Nihon EP10QY03 or
Toshiba CRS02
2.2碌H power inductor
Panasonic ETQP6F2R2SFA or
Sumida CDRH127-2R4
DESIGNATION
L2
N1
QTY
1
1
DESCRIPTION
4.7碌H power inductor
Sumida CDRH124-4R7MC
N-channel MOSFET
International Rectifier IRF7807 or
Fairchild FDS6612A
N-channel MOSFET
International Rectifier IRF7805 or
Fairchild FDS6670A
Dual N-channel MOSFET
Fairchild FDS6982A
Not installed
0.005鈩?/div>
鹵1%,
1W resistor (2512)
Dale WSL-2512-R005F or
Panasonic ERJM1WSF5MOU
100k鈩?/div>
鹵5%
resistor (0805)
1M鈩?/div>
鹵5%
resistors (0805)
0.010鈩?/div>
鹵1%,
1/2W resistor (2010)
Dale WSL-2010-R010F
10鈩?/div>
鹵5%
resistor (0805)
MAX1845EEI (28-pin QSOP)
3-pin headers
Shunts
Rubber feet
MAX1845 PC board
MAX1845 data sheet
MAX1845EVKIT data sheet
C6鈭扖9
C10, C11
C12
4
2
1
N2
N3A, N3B
R1鈭扲4, R7, R8,
R10鈭扲14
R5
R6
R9, R15
R19
R20
U1
JU1, JU2, JU3
None
None
None
None
None
1
1
0
1
1
2
1
1
1
3
3
4
1
1
1
C13
C14, C15, C17,
C18
C16
C19
D1
D2, D3
1
0
1
1
1
2
L1
1
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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