19-2080; Rev 0; 07/01
MAX1844 Evaluation Kit
General Description
The MAX1844 evaluation kit (EV kit) demonstrates the
MAX1844鈥檚 standard 4A application circuit. This DC-DC
converter steps down high-voltage batteries and/or AC
adapters, generating a precision, low-voltage rail for
use as chipset, DRAM, and other low-voltage supplies.
The MAX1844 EV kit provides a 1.8V output voltage
from a 7V to 24V battery input range. It delivers up to
4A output current with greater than 90% 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. It also allows the evaluation of other output volt-
ages in the 1.0V to 5.5V range by changing feedback
resistors R1 and R2.
o
7V to 24V Input Voltage Range
o
Accurate Current Sense
o
Preset 1.8V/2.5V Output Voltage
o
1.0V to 5.5V Adjustable Output
o
4A Output Current
o
300kHz Switching Frequency
o
Power-Good Output
o
Over/Undervoltage Protection
o
20-Pin QSOP Package
o
Low-Profile Components
o
Fully Assembled and Tested
Features
Evaluates: MAX1844
Ordering Information
PART
MAX1844EVKIT
TEMP. RANGE
0
o
C to +70
o
C
IC PACKAGE
20 QSOP
Component List
DESIGNATION QTY
C1
1
DESCRIPTION
10碌F, 25V ceramic capacitor (1812)
Taiyo Yuden TMK432BJ106KM or
TDK C4532X5R1E106M
330碌F, 6.3V 40m鈩?low-ESR
capacitor
Sanyo 6TPB330M
0.1碌F ceramic capacitor (0805)
0.22碌F ceramic capacitor (1206)
4.7碌F, 10V X5R ceramic capacitor
(1206)
Taiyo Yuden LMK316BJ475ML
3.3碌F, 10V X5R ceramic capacitor
(1206)
Taiyo Yuden LMK316BJ335ML
2200pF ceramic capacitor (0805)
1A Schottky diode
Nihon EP10QY03,
International Rectifier 10MQ040N,
or Nihon EC10QS03
100mA, 30V Schottky diode
Central Semiconductor CMPSH-3
U1
JU1, JU2
JU9, JU10
None
None
None
None
1
2
2
4
1
1
1
DESIGNATION QTY
L1
N1A, N1B
C2
C3
C4
C5
1
1
1
1
R1, R2, R11,
R13, R14, R15
R3
R4
R5, R6
R7
R8
R9
R10
1
1
0
1
1
2
1
1
1
1
DESCRIPTION
4.7碌H power inductor
Sumida CDRH124-4R7MC
Dual N-channel MOSFET
Fairchild FDS6982A
Not installed (0805)
130k鈩?/div>
鹵1%
resistor (0805)
100k鈩?/div>
鹵5%
resistor (0805)
1M鈩?/div>
鹵5%
resistors (0805)
20鈩?/div>
鹵5%
resistor (0805)
200鈩?/div>
鹵5%
resistor (0805)
274k鈩?/div>
鹵1%
resistor (0805)
0.015鈩?/div>
鹵1%
1/2W resistor (2010)
IRC LR2010-01-R015-F or
Dale WSL-2010-R015F
MAX1844EEP (20-pin QSOP)
2-pin headers
3-pin headers
Shunts (JU1, JU2, JU9, JU10)
MAX1844 PC board
MAX1844 data sheet
MAX1844 EV kit data sheet
C6
C7
1
1
D1
1
D2
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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