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High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
Table 1. Component Suppliers
SUPPLIER
PHONE
WEBSITE
BATTERY
L1
D1
INPUT
Central
Semiconductor
631-435-1110
www.centralsemi.com
C1
4.7 μ F
3.3V
LOGIC
C4
V CC
LX
C2
0.47 μ F
R2
Kamaya
260-489-1533
www.kamaya.com
0.1 μ F
Murata
814-237-1431
www.murata.com
ON
OFF
EN
OV
WHITE
Nichia
Panasonic
Sumida
248-352-6575
714-373-7939
847-956-0666
www.nichia.com
www.panasonic.com
www.sumida.com
MAX1553
MAX1554
BRT
FB
R3
LEDs
Taiyo Yuden
408-573-4150
www.t-yuden.com
C3
SS
GND
R1
TDK
TOKO
847-803-6100
847-297-0070
www.component.tdk.com
www.toko.com
0.1 μ F
Figure 4. The MAX1553/MAX1554 can drive LEDs from battery
Ensure the diode’s average and peak current ratings
exceed the average output current and peak inductor
current. In addition, the diode’s reverse breakdown
voltage must exceed V OUT .
Applications Information
Low Input-Voltage Applications
The MAX1553/MAX1554 have minimum input voltages
of 2.7V (MAX1553) and 3.15V (MAX1554). However,
lower battery voltages can still be boosted for LED
drive as long as V CC remains within the operating
range. Since most systems have a 3.3V system supply
active when the display is active and backlit, that logic
supply can be used to supply V CC , while the battery
power connects directly to the boost inductor. No bat-
tery current is drawn when EN is low (Figure 4).
voltages that are lower than the device operating voltage
range by powering V CC from a logic supply and connecting
the boost inductor to the battery.
When laying out a board, minimize trace lengths
between the IC and the inductor, diode, input capaci-
tor, output capacitor, and R1. Keep traces short, direct,
and wide. Keep noisy traces, such as the LX node
trace, away from FB. Place the V CC bypass capacitor
(C1) as close to the IC as possible. The ground con-
nections of C1 and C2 should be as close together as
possible. Star connect the grounds for R1, R3, C3, and
the BRT voltage supply as close to the IC as possible.
The traces from V CC to C1, from C2 to the LEDs, and
from the LEDs to R1 can be longer if required.
PC Board Layout
Due to fast-switching waveforms and high-current
paths, careful PC board layout is required. An evalua-
tion kit (MAX1553EVKIT) is available as an example of
a proper layout.
TRANSISTOR COUNT: 740
PROCESS: BiCMOS
Chip Information
_______________________________________________________________________________________
9
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MAX1555EZK+ 制造商:Maxim Integrated Products 功能描述:CHRGR LI-ION/LI-POL 280MA 4.2V 5PIN TSOT-23 - Rail/Tube
MAX1555EZK+T 功能描述:电池管理 Dual USB/AC 1-Cell Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX1555EZK+T 制造商:Maxim Integrated Products 功能描述:CHARGER BATT LI+ USB/AC 5SOT23 制造商:Maxim Integrated Products 功能描述:CHARGER, BATT, LI+, USB/AC, 5SOT23 制造商:Maxim Integrated Products 功能描述:CHARGER, BATT, LI+, USB/AC, 5SOT23; Battery Type:Li-Ion, Li-Polymer; Input Voltage:7V; Battery Charge Voltage:4.2V; Charge Current Max:280mA; Battery IC Case Style:SOT-23; No. of Pins:5; No. of Series Cells:1; Operating Temperature ;RoHS Compliant: Yes
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