MAX1573 Evaluation Kit Datasheet by Maxim Integrated

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lVI/JXI/VI [VI/JXI/VI
General Description
The MAX1573 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board. The EV kit con-
tains the MAX1573, a white LED driver with a high-effi-
ciency charge pump. The EV kit accepts a 2.7V to 5.5V
input voltage and drives up to 4 white LEDs with regu-
lated constant current for uniform intensity. The
MAX1573 runs at 1MHz fixed frequency, allowing tiny
external components. An EV kit is available for both the
UCSP and the TQFN packages.
Features
Proprietary Adaptive 1x/1.5x Modes
High Efficiency (PLEDs / PBATT), Up to 92%
2% LED Current Matching
28mA/LED Drive Capability
Eliminates Ballast Resistor
Low 0.1µA Shutdown Current
2.7V to 5.5V Input Voltage Range
Tiny 2.1 x 2.1 x 0.6mm UCSPPackage
Surface-Mount Components
Fully Assembled and Tested
Evaluates: MAX1573
MAX1573 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-2894; Rev 1; 4/04
Component List
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.
Ordering Information
Quick Start
Recommended Equipment
For evaluation of either EV kit:
Variable-output power supply capable of supplying
up to +5.5V at 300mA
Procedure
The MAX1573 EV kit is fully assembled and tested.
Perform the following steps to verify board operation.
Do not turn on the power supply until all connec-
tions are completed:
1) Verify that shunts are across pins 1 and 2 of JU1
(EN1) and JU2 (EN2).
2) Preset the power supply to 2.7V and turn off.
3) Connect the positive lead of the power supply to the
VIN pad on the EV kit board. Connect the ground
lead of the power supply to the GND pad directly
below the VIN pad.
4) Turn on the power supply.
5) Verify that all 4 white LEDs are on with uniform
intensity.
PART
TEMP RANGE
IC PACKAGE
MAX1573EVKIT 0°C to +70°C 14 UCSP 4 x 4
MAX1573TQFNEVKIT
0°C to +70°C 16 TQFN
DESIGNATION QTY DESCRIPTION
C1C4 4
1µF ±10%, 6.3V X5R ceramic
capacitors (0603)
TDK C1608X5R0J105K
D1D4 4 Surface-mount white LEDs
Nichia NSCW215T
JU1, JU2 2 3-pin headers
JU3 1 Not installed
R1 1 7.5k ±1% resistor (0603)
U1 1 MAX1573EBE or MAX1573ETE
None 2 Shunts
None 1 MAX1573EVKIT PC board
UCSP is a trademark of Maxim Integrated Products, Inc.
Component Suppliers
Note: Please indicate that you are using the MAX1573 when contacting these suppliers.
SUPPLIER COMPONENT PHONE WEBSITE
Nichia LEDs 717-285-2323 www.nichia.com
Panasonic Resistors 714-373-7366 www.maco.panasonic.co.jp
Taiyo Yuden Capacitors 408-573-4150 www.t-yuden.com
TDK Capacitors 888-835-6646 www.component.tdk.com
HH HH [MAXI/VI \Hi [VI/JXIIVI
Evaluates: MAX1573
MAX1573 Evaluation Kit
2 _______________________________________________________________________________________
6) Sweep the power supply to 5.5V. Verify that all 4
LEDs remain on with constant and uniform intensity.
7) Reconfigure JU1 and JU2 to verify the different
brightness levels. For instructions on brightness
control, see Table 1.
Detailed Description
Jumper Selection
EN1 and EN2 on the MAX1573 provide control for
ON/OFF, 1/10, 3/10, and full current. JU1 and JU2 con-
nect these 2 pins to either VIN or GND (see Table 1).
An external signal can be used to drive EN1 or EN2 by
removing the corresponding shunt completely from the
jumper and connecting the external signal to the
appropriate connecting pad.
Setting LED Current
The default LED current is set to 17mA (with shunts
across pins 1 and 2 on JU1 and JU2). To set a different
LED current, change R1, where R1 = 215 x 0.6 /
ILED(FULL).
Evaluating Off-Board LEDs
The MAX1573 EV kit allows for easy evaluation of off-
board LEDs. To evaluate off-board LEDs, first cut the
trace that shorts JU3. Next, connect the pad labeled
VOUT on the EV kit to the anodes of the LEDs under
evaluation. Last, connect the cathode of each LED to
one of the EV kit pads labeled LED1LED4. If evaluat-
ing fewer than 4 off-board LEDs, see the Evaluating
Fewer Than 4 LEDs section.
Evaluating Fewer than 4 LEDs
To evaluate fewer than 4 LEDs, remove the desired
LED(s) and connect the corresponding LED pad(s) to
the input voltage. Do not leave LED pad(s) floating.
MAX1573
VOUT
OUT
LED1 D4 LED1
LED2
LED3
LED4
A2
IN
C2
1µF
C3
1µF
EN1
EN2
SET
C1
JU1
JU2 C4
D3
C3
D2
B2
B1A1
D1
C1N C1P C2N C2P
D4
U1
LED2
LED3
LED4
GND
D3
D2D1
JU3
SHORT
C4
1µF
C1
1µF
R1
7.5k
1%
VIN
2.7V TO 5.5V
EN1/PWM
EN2
GND
1
2
3
1
2
3
A3
A4
B4
GND0
JU1 POSITION EN1 JU2 POSITION EN2 MAX1573 OUTPUT
1 and 2 Connected to VIN 1 and 2 Connected to VIN Full brightness
1 and 2 Connected to VIN 2 and 3 Connected to GND 3/10 brightness
2 and 3 Connected to GND 1 and 2 Connected to VIN 1/10 brightness
2 and 3 Connected to GND 2 and 3 Connected to GND Shutdown
Figure 1. MAX1573 EV Kit Schematic
Table 1. JU1 and JU2 Functions (Dimming Control)
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Evaluates: MAX1573
MAX1573 Evaluation Kit
_______________________________________________________________________________________ 3
Figure 2. MAX1573 UCSP EV Kit Component Placement
Guide—Top Silkscreen
Figure 4. MAX1573 UCSP EV Kit PC Board Layout—
Component Side
Figure 5. MAX1573 UCSP EV Kit PC Board Layout—Solder
Side
Figure 3. MAX1573 UCSP EV Kit Component Placement
Guide—Bottom Silkscreen
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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
4_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Evaluates: MAX1573
MAX1573 Evaluation Kit
Figure 6. MAX1573 TQFN EV Kit Component Placement
Guide—Top Silkscreen
Figure 7. MAX1573 TQFN EV Kit Component Placement
Guide—Bottom Silkscreen
Figure 9. MAX1573 TQFN EV Kit PC Board Layout—Solder
Side
Figure 8. MAX1573 TQFN EV Kit PC Board Layout—
Component Side

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