19-2701; Rev 0; 12/02
MAX1993 Evaluation Kit
General Description
The MAX1993 evaluation kit (EV kit) demonstrates the
MAX1993鈥檚 standard 4A application circuit. This DC-to-
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 MAX1993 EV kit provides a dynamically adjustable
1.0V/1.5V output voltage from 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 dynamically
adjustable output voltages in the 0.7V to 5.5V range by
changing R6, R7, and R8 resistors.
This EV kit can also be used to evaluate the MAX1992,
which has preset 1.8V/2.5V output voltages.
Features
o
7V to 24V Input Voltage Range
o
Preset 1.8V/2.5V Output Voltages (Adjustable from
0.7V to 5.5V, MAX1992)
o
Dynamically Selectable Output Voltages 1.0V/1.5V
(Adjustable from 0.7V to 5.5V, MAX1993)
o
4A Output Current
o
300kHz Switching Frequency
o
Selectable Inductor Saturation Protection
o
Power-Good Output
o
Selectable Overvoltage/Undervoltage Protection
o
Low-Profile Components
o
Fully Assembled and Tested
Evaluates: MAX1992/MAX1993
Ordering Information
PART
MAX1993EVKIT
TEMP RANGE
0擄C to +70擄C
IC PACKAGE
24 Thin QFN 4mm
脳
4mm
Component List
DESIGNATION QTY
C1
1
DESCRIPTION
10碌F, 25V ceramic capacitor (1812)
Taiyo Yuden TMK432BJ106KM or
TDK C4532X5R1E106M
270碌F, 2.5V, 9m鈩?low-ESR capacitor
Sanyo 2R5TPE220M9
1碌F, 10V X5R ceramic capacitors (0805)
Taiyo Yuden LMK212BJ105KG or
TDK C2012X5R105M
0.1碌F ceramic capacitor (0603)
470pF ceramic capacitor (0603)
0.22碌F, 16V X5R ceramic capacitor
(0805)
Taiyo Yuden EMK212BJ224KG
1000pF ceramic capacitor (0603)
10碌F, 6.3V X5R ceramic capacitor
(0805)
TDK C2012X5R0J106M or
Taiyo Yuden AMK212BJ106MG
Not installed (0603)
1A, 30V Schottky diode
Nihon EP10QY03 or Nihon EC10QS03
100mA, 30V Schottky diode
Central Semiconductor CMPSH-3
3-pin headers
R19
U1
None
None
None
0
1
4
4
1
DESIGNATION QTY
JU4
L1
N1A, N1B
R1, R11,
R12, R22
R2, R3,
R13鈥揜17,
R20, R21
R4
R5
R6, R7
R8
R9
R10
R18
1
1
2
4
DESCRIPTION
4-pin header
2.5碌H, 7.5A power inductor
Sumida CDRH104R-2R5
Dual N-channel MOSFETs
Fairchild FDS6982A
0鈩?resistors (0603)
C2
1
C3, C7
C4
C5
C6
C8
2
1
1
1
1
0
1
1
2
1
1
1
1
Not installed (0603)
100k鈩?鹵1% resistor (0603
49.9k鈩?鹵1% resistor (0603)
75k鈩?鹵1% resistors (0603)
150k鈩?鹵1% resistor (0603)
100k鈩?鹵5% resistor (0603)
20鈩?鹵5% resistor (0805)
0.015鈩?鹵1%, 1/2W resistor (2010)
IRC LR2010-01-R015-F or
Dale WSL-2010-R015F
Not installed (short PC trace) (0805)
MAX1993ETG (24-pin thin QFN)
Shunts
Rubber feet
MAX1993 PC board
C9
1
C10, C11, C12
D1
D2
JU1, JU2, JU3
0
1
1
3
________________________________________________________________
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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