19-2499; Rev 0; 7/02
MAX1999 Evaluation Kit
General Description
The MAX1999 evaluation kit (EV kit) demonstrates the
MAX1999鈥檚 standard application circuit. This DC-DC con-
verter steps down high-voltage batteries and/or AC
adapters, generating system supplies for notebook com-
puters. The MAX1999 EV kit provides dual 5V and 3.3V
output voltages from a 7V to 24V battery input range. It
delivers up to 5A output current for the 5V output and 5A
for the 3.3V output with greater than 90% efficiency. The
EV kit operates at 200kHz/300kHz switching frequency
(5V/3.3V, respectively) and has superior line-and-load-
transient response.
This EV kit is a fully assembled and tested circuit board. It
allows the evaluation of other output voltages in the 2V to
5.5V range by changing feedback resistors R1鈥揜4.
This EV kit can also be used to evaluate the MAX1777
(200kHz/5.0V SMPS and 300kHz/3.3V SMPS) and the
MAX1977 (400kHz/5.0V SMPS and 500kHz/3.3V SMPS).
o
7V to 24V Input Voltage Range
o
3.3V and 5V Output Voltages
o
2V to 5.5V Adjustable Outputs (External Resistors)
o
5A Output Current (3.3V Output)
o
5A Output Current (5V Output)
o
No Current-Sense Resistor Needed (MAX1999)
o
Accurate Current Sense with Current-Sense
Resistor (MAX1777/MAX1977)
o
200kHz/300kHz Switching Frequency (5V/3.3V,
Respectively)
o
Power-Good (PGOOD) Output
o
Fault Protection Enable/Disable
o
28-Pin QSOP Package
o
Low-Profile Components
o
Fully Assembled and Tested
Features
Evaluates: MAX1777/MAX1977/MAX1999
Ordering Information
PART
MAX1999EVKIT
TEMP RANGE
0
o
C to +70
o
C
IC PACKAGE
28 QSOP
Note:
To evaluate the MAX1777/MAX1977, request a
MAX1777EEI/MAX1977EEI free sample with the MAX1999EVKIT.
Component List
DESIGNATION QTY
C1, C2, C3
C4
C5, C7
C6
3
0
0
1
DESCRIPTION
10碌F, 25V ceramic capacitors (1812)
Taiyo Yuden TMK432BJ106KM or
TDK C4532X5R1E106M
Not installed (1812)
Not installed, D case
470碌F, 4V, 40m鈩? low-ESR capacitor,
D case
Sanyo 4TPB470M
330碌F, 6.3V, 40m鈩? low-ESR
capacitor, D case
Sanyo 6TPB330M
0.1碌F ceramic capacitors (0805)
1碌F, 10V X5R ceramic capacitors
(0805)
Taiyo Yuden LMK212BJ105KG or
TDK C2012X5R105M
C17
1
DESIGNATION QTY
C13, C14
C16
0
1
DESCRIPTION
Not installed
0.22碌F, 16V X5R ceramic capacitor
(0805)
Taiyo Yuden EMK212BJ224KG
4.7碌F, 35V tantalum capacitor, C case
Sprague 595D475X0035C2B
4.7碌F, 16V tantalum capacitors,
A case
Sprague 595D475X0016A2B
100mA, 30V dual Schottky diode
Central Semiconductor CMPSH-3A
1A, 30V Schottky diodes
Nihon EP10QY03
Toshiba CRS02
3-pin headers
4-pin headers
C18, C19
2
C8
C9, C10, C12,
C15
1
D1
1
4
D2, D3
JU1, JU2
JU3, JU5
2
2
2
C11, C24
2
________________________________________________________________
Maxim Integrated Products
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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.
Maxim
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