MAX1575ETE [MAXIM]
White LED 1x/1.5x Charge Pump for Main and Sub-Displays; 白光LED，1 /倍/1.5倍电荷泵的主，次屏显示器
| 型号： | MAX1575ETE |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | White LED 1x/1.5x Charge Pump for Main and Sub-Displays |
| 文件： | 总4页 (文件大小：88K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3335; Rev 0; 7/04
MAX1 5 7 5 Eva lu a t io n Kit
Ge n e ra l De s c rip t io n
Fe a t u re s
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 s ing le -wire s e ria l p uls e -d imming fe a ture of the
MAX1575.
♦ Powers 4 Main and 2 Sub-Display LEDs
♦ Average 85% Efficiency (PLED / PBATT) 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
Co m p o n e n t Lis t
DESIGNATION
QTY
DESCRIPTION
1µF ±20%, 6.3V X5R ceramic
capacitors (0402)
C1–C4
4
Panasonic ECJ0EB0J105M or
TDK C1005X5R0J105M or
equivalent
Ord e rin g In fo rm a t io n
PART
TEMP RANGE
IC PACKAGE
2.2µF ±10%, 6.3V X5R ceramic
capacitors (0603)
MAX1575EVKIT 0°C to +70°C
16 Thin QFN (4mm x 4mm)
C5, C8
C6, C7
2
2
Panasonic ECJ1VB0J225K or
TDK C1608X5R0J225K or
equivalent
Qu ic k S t a rt
0.01µF ±10%, X7R ceramic
capacitors (0402)
TDK C1005X7R1E103K or
equivalent
Re c o m m e n d e d Eq u ip m e n t
A 2.7V to 5.5V power supply or battery capable of
delivering 200mA.
P ro c e d u re
White surface-mount
right-angle LEDs
Follow the steps below to verify board operation.
D1–D6
D7, D8
6
2
Nichia NSCW215T
1) Verify that shunts are connected across pins 1-2 of
jumpers JU2 and JU3.
Diodes (SOD-323)
Central CMDD4448
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.
JU1
JU2, JU3
R1
0
2
1
2
Not installed, PC board short
3-pin headers
4) Connect the positive power supply terminal to the
pad on the EV kit labeled IN.
6.81kΩ ±1% resistor (0402)
10kΩ ±5% resistors (0402)
5) Connect the power supply ground terminal to the
pad on the EV kit labeled GND.
R2, R3
Momentary pushbutton switches
Panasonic EVQ-PHP03T
6) Turn on the power supply and verify that the LEDs
are lit.
S1, S2
U1
2
1
Maxim MAX1575ETE
(16 thin QFN 4mm x 4mm)
See the Detailed Description section for testing the
dimming and shutdown features.
U2, U3
—
2
2
MAX6818EUS-T (4-pin SOT143)
Shunt, 2 position
________________________________________________________________ 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.
MAX1 5 7 5 Eva lu a t io n Kit
Co m p o n e n t S u p p lie rs
SUPPLIER
Central Semiconductor
PHONE
WEBSITE
www.centralsemi.com
www.kamaya.com
631-435-1110
260-489-1533
814-237-1431
248-352-6575
714-373-7939
408-573-4150
847-803-6100
402-563-6866
Kamaya
Murata
www.murata.com
Nichia
www.nichia.com
Panasonic
Taiyo Yuden
TDK
www.panasonic.com
www.t-yuden.com
www.component.tdk.com
www.vishay.com
Vishay
Note: Indicate that you are using the MAX1575 when contacting these component suppliers.
S h u t d o w n
De t a ile d De s c rip t io n
Two jumpers are included on the EV kit for shutting
down each of the displays. To turn off the main LED
group, short pins 2-3 of JU2. To turn off the sub-LED
group, short pins 2-3 of JU3. Note that with pins 2-3 of
JU2 or JU3 shorted, power is disconnected from the
corresponding pulse-generator circuit on the left side of
the board. To place the MAX1575 in low-power shut-
down mode and disconnect power from both pulse-
generator circuits, short pins 2-3 of both JU2 and JU3.
LED Dim m in g
To test the dimming feature, press the button labeled
DIM MAIN or DIM SUB. Each of the first nine button
presses dims the corresponding group of LEDs by
10%. The tenth press dims the LEDs by 5%, and the
eleventh press returns the LEDs to full brightness. Refer
to the MAX1575 data sheet for more information on the
dimming feature.
Using External Pulse Generators for Dimming
To use external pulse generators in place of the pulse
generators included with the EV kit, simply connect the
outputs of the external pulse generators to EN_MAIN
for the main display dimming, and EN_SUB for the sub-
display dimming. The grounds of the external pulse
g e ne ra tors s hould b e c onne c te d to the EV kit p a d
labeled GND. Short pins 1-2 of jumpers JU2 and JU3.
Note tha t the re a re 10kΩ p ullup re s is tors from
EN_MAIN and EN_SUB to IN on the EV kit.
Ch a n g in g t h e Nu m b e r o f LEDs
The EV kit comes with 6 LEDs installed, 4 for the main
display and 2 for the sub-display. To use fewer LEDs,
locate the small pad next to the LED to be removed and
connect it to the pad on the EV kit labeled IN.
Co n n e c t in g Ex t e rn a l LEDs
To connect external LEDs to the MAX1575 EV kit, cut
the trace shorting JU1. Connect the anodes of all the
external LEDs to the small pad labeled OUT. Connect
the cathodes to the small pads next to D1–D6 (D1–D4
for the main LEDs, D5–D6 for the sub-LEDs). Connect
any unused pads (D1–D6) to IN.
Ad ju s t in g t h e 1 0 0 % Brig h t n e s s Le ve l
The full-brightness LED current is adjusted by chang-
ing the resistor R1. Calculate the value of R1 with the
following equation, where I
is the current through
LED_
one of the LEDs with the dimming set to 100%.
0.6V × 234
R1 =
I
LED_
2
_______________________________________________________________________________________
MAX1 5 7 5 Eva lu a t io n Kit
IN EN_MAIN GND IN
C1
1µF
1
2
3
JU2
16
C1P
13
C5
2.2µF
IN
OUT
C1N
C4
1µF
4
R2
10kΩ
D7
14
12
V
CC
IN
2
JU1
OUT
C3
1µF
U2
3
2
D1
D2
D3
OUT
IN
11
LED1
LED2
LED3
GND
MAX6816
C6
0.01µF
GND
1
IN
10
9
S1
5
4
U1
ENM
ENS
1
2
3
JU3
MAX1575
R1
6.81kΩ
C8
2.2µF
4
D4
D5
D6
8
7
6
R3
10kΩ
3
D8
LED4
LED5
LED6
SET
V
CC
U3
2
3
OUT
IN
MAX6816
C7
0.01µF
GND
1
S2
C2P
C2N
15
1
EN_SUB
C2
1µF
Figure 1. MAX1575 EV Kit Schematic
_______________________________________________________________________________________
3
MAX1 5 7 5 Eva lu a t io n Kit
Figure 3. MAX1575 EV Kit Layout—Component Side
Figure 2. MAX1575 EV Kit Component Placement Guide—
Component Side
Figure 4. MAX1575 EV Kit Layout—Solder Side
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
_____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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