MAX1575 Datasheet, PDF (1/4 Pages) Maxim Integrated Products – MAX1575 Evaluation Kit

19-3335; Rev 0; 7/04
MAX1575 Evaluation Kit
General Description
The MAX1575 evaluation kit (EV kit) is a fully assem-
bled and tested circuit for evaluating the MAX1575
white LED 1x/1.5x charge pump. The MAX1575 drives
4 white LEDs in a main display group and 2 white LEDs
in a sub-group. These 6 surface-mount white LEDs are
included on the EV kit. In addition to the LED driver cir-
cuit, the EV kit includes two pulse-generator circuits on
the left side of the PC board that are used for testing
the single-wire serial pulse-dimming feature of the
MAX1575.
Component List
DESIGNATION
C1–C4
C5, C8
C6, C7
D1–D6
QTY
4
2
2
DESCRIPTION
1µF ±20%, 6.3V X5R ceramic
capacitors (0402)
Panasonic ECJ0EB0J105M or
TDK C1005X5R0J105M or
equivalent
2.2µF ±10%, 6.3V X5R ceramic
capacitors (0603)
Panasonic ECJ1VB0J225K or
TDK C1608X5R0J225K or
equivalent
0.01µF ±10%, X7R ceramic
capacitors (0402)
TDK C1005X7R1E103K or
equivalent
White surface-mount
6 right-angle LEDs
Nichia NSCW215T
D7, D8
JU1
2 ^{Diodes (SOD-323)}
Central CMDD4448
0 Not installed, PC board short
JU2, JU3
R1
R2, R3
S1, S2
U1
U2, U3
2 3-pin headers
1 6.81kΩ ±1% resistor (0402)
2 10kΩ ±5% resistors (0402)
2 ^{Momentary pushbutton switches}
Panasonic EVQ-PHP03T
1 ^{Maxim MAX1575ETE}
(16 thin QFN 4mm x 4mm)
2 MAX6818EUS-T (4-pin SOT143)
—
2 Shunt, 2 position
Features
♦ Powers 4 Main and 2 Sub-Display LEDs
♦ Average 85% Efficiency (P_LED / P_BATT) over Li+
Battery Discharge
♦ 1.5% LED Current Matching
♦ Adaptive 1x/1.5x Mode Switchover
♦ Low Input Ripple and EMI
♦ Individual 5% to 100% Brightness Single-Wire
Serial Pulse Dimming
♦ 2.7V to 5.5V Supply Voltage Range
♦ Thin QFN 4mm x 4mm IC Package
♦ Fully Assembled and Tested
Ordering Information
PART
TEMP RANGE
IC PACKAGE
MAX1575EVKIT 0°C to +70°C 16 Thin QFN (4mm x 4mm)
Quick Start
Recommended Equipment
A 2.7V to 5.5V power supply or battery capable of
delivering 200mA.
Procedure
Follow the steps below to verify board operation.
1) Verify that shunts are connected across pins 1-2 of
jumpers JU2 and JU3.
2) Preset the power supply to between 2.7V and 5.5V.
3) Turn off the power supply. Do not turn on the power
supply until all connections are completed.
4) Connect the positive power supply terminal to the
pad on the EV kit labeled IN.
5) Connect the power supply ground terminal to the
pad on the EV kit labeled GND.
6) Turn on the power supply and verify that the LEDs
are lit.
See the Detailed Description section for testing the
dimming and shutdown features.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.