MAX1999 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 7V to 24V Input Voltage Range, 3.3V and 5V Output Voltages

19-2499; Rev 0; 7/02
MAX1999 Evaluation Kit
General Description
The MAX1999 evaluation kit (EV kit) demonstrates the
MAX1999’s 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–R4.
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).
Features
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
Ordering Information
PART
MAX1999EVKIT
TEMP RANGE
0^oC to +70^oC
IC PACKAGE
28 QSOP
Note: To evaluate the MAX1777/MAX1977, request a
MAX1777EEI/MAX1977EEI free sample with the MAX1999EVKIT.
Component List
DESIGNATION QTY
DESCRIPTION
C1, C2, C3
10µF, 25V ceramic capacitors (1812)
3 Taiyo Yuden TMK432BJ106KM or
TDK C4532X5R1E106M
C4
0 Not installed (1812)
C5, C7
0 Not installed, D case
470µF, 4V, 40mΩ, low-ESR capacitor,
C6
1 D case
Sanyo 4TPB470M
330µF, 6.3V, 40mΩ, low-ESR
C8
1 capacitor, D case
Sanyo 6TPB330M
C9, C10, C12,
C15
4 0.1µF ceramic capacitors (0805)
C11, C24
1µF, 10V X5R ceramic capacitors
2
(0805)
Taiyo Yuden LMK212BJ105KG or
TDK C2012X5R105M
DESIGNATION QTY
DESCRIPTION
C13, C14
0 Not installed
0.22µF, 16V X5R ceramic capacitor
C16
1 (0805)
Taiyo Yuden EMK212BJ224KG
C17
1
4.7µF, 35V tantalum capacitor, C case
Sprague 595D475X0035C2B
C18, C19
4.7µF, 16V tantalum capacitors,
2 A case
Sprague 595D475X0016A2B
D1
1
100mA, 30V dual Schottky diode
Central Semiconductor CMPSH-3A
D2, D3
1A, 30V Schottky diodes
2 Nihon EP10QY03
Toshiba CRS02
JU1, JU2
2 3-pin headers
JU3, JU5
2 4-pin headers
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1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.