19-1893; Rev 0; 1/01
MAX1775 Evaluation Kit
General Description
The MAX1775 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains a
dual step-down switching regulator circuit. The circuit is
configured for a main output voltage of +3.3V and a
core output voltage of +1.8V. The main output provides
up to 1.5A, and the core provides up to 500mA of cur-
rent.
Power for the circuit can be provided from a +2.7V to
+5.5V DC source. The EV kit can be reconfigured for
input voltages up to +28V. The core鈥檚 input can be
powered from the input source or, for higher input volt-
ages, from the main output.
The MAX1775 EV kit demonstrates low quiescent cur-
rent and high efficiency up to 95% for maximum battery
life. Operation up to 1.25MHz allows the use of tiny sur-
face-mount components.
o
+2.7V to +5.5V Input Range
o
Output Voltages
+3.3V Output at 1.5A
+1.8V Output at 500mA
o
Outputs are Adjustable with Resistors
o
Internal MOSFET Switches (Core Output)
o
5碌A (typ) IC Shutdown Current
o
Switching Frequency Up to 1.25MHz
o
Surface-Mount Components
o
Fully Assembled and Tested
Features
Evaluates: MAX1775
Ordering Information
PART
MAX1775EVKIT
TEMP. RANGE
0掳C to +70掳C
IC PACKAGE
16 QSOP
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
10碌F, 25V X5R ceramic
capacitor (1812)
Taiyo Yuden TMK432BJ106KM
1碌F, 25V X7R ceramic
capacitors (1206)
Taiyo Yuden TMK316BJ105KL
47碌F, 6.3V low-ESR electrolytic
capacitor (POSCAP)
Sanyo 6TPA47M
47碌F 卤20%, 6.3V tantalum
capacitor (C)
Sprague-Vishay
592D476X06R3C2T or
AVX TPSC476M016R0350
recommended
0.22碌F, 25V X7R ceramic
capacitor (1206)
Taiyo Yuden TMK316BJ224KF
10碌F, 6.3V X5R ceramic
capacitors (1206)
Taiyo Yuden JMK316BJ106KL
Not installed, capacitors (0805)
DESIGNATION
D1
L1
C2, C5
2
L2
QTY
0
1
1
DESCRIPTION
Not installed, Schottky diode
Nihon EC31QS04 optional
5.0碌H, 2.4A inductor
Sumida CDRH6D28-5R0NC
5.4碌H, 1.6A inductor
Sumida CDRH5D18-5R4NC
+30V/-20V, 5.5A/4.0A
N/P-channel MOSFET (SO-8)
Fairchild Semiconductor
FDS8928A
24.3k鈩?/div>
卤1%
resistor (0805)
30.1k鈩?/div>
卤1%
resistor (0805)
0.033鈩?卤1%, 0.5W resistor
(2010) Dale WSL-2010-R033-1%
66.5k鈩?/div>
卤1%
resistor (0805)
40.2k鈩?/div>
卤1%
resistor (0805)
MAX1775EEE (16 QSOP)
3-pin headers
Shunts (JU1, JU2)
MAX1775 PC board
MAX1775 data sheet
MAX1775 EV kit data sheet
C3
1
P1A/P1B
1
R1
R2
R3
R4
R5
U1
JU1, JU2
None
None
None
None
1
1
1
1
1
1
2
2
1
1
1
C4
1
C6
1
C7, C8
C9, C10
2
0
________________________________________________________________
Maxim Integrated Products
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For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.
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