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White LED 1x/1.5x Charge Pump in
UCSP and Thin QFN
PC Board Layout and Routing
The MAX1573 is a high-frequency switched-capacitor
voltage regulator. For best circuit performance, use a
solid ground plane and place C IN and C OUT as close
to the MAX1573 as possible. Also, place their ground
pads close together and as close as possible to GND.
See the MAX1573 EV kit for an example.
Component Selection
Use ceramic capacitors with an X5R dielectric or better
temperature coefficient. The transfer capacitors may be
reduced in value if the input voltage does not fall below
3.4V, if only two or three LEDs are used, or if four LEDs
are used at 10mA or less. Some typical external com-
ponent values are shown in Table 2.
Under normal operating conditions, power dissipation
is low. Maximum power dissipation occurs at an input
voltage of 4.2V and all four LEDs (with V F = 4V) are dri-
ven with 30mA per LED. The power is calculated as:
P D = [(1.5 x V IN ) - V F ] x 120mA = 276mW
At higher input voltages, the MAX1573 switches to 1x
mode and power dissipation decreases.
Pin Configurations (continued)
1 μ F
1 μ F
C1P C1N
C2P C2N
TOP VIEW
1
2
3
4
V IN
1 Ω
IN
OUT
C1P
OUT
EN1
EN2
2.2 μ F
2.2 μ F
1 μ F
A
C2N
C2P
SET
EN1
MAX1573
LED1
B
EN2
SET
LED2
LED3
C
IN
LED4
LED2
RSET
GND
LED4
D
C1N
GND
LED3
LED1
UCSP 4 ? 4
Figure 3. C-R-C Filter Reduces Input Ripple
Table 2. Typical Component Values
COMPONENT
Input/Output
Capacitors
Transfer
Capacitors
LED
R SET
VALUE (μF)
1
1
0.47
0.22
—
As required
MANUFACTURER
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Nichia
Panasonic
PART
JMK107BJ105KA
JMK107BJ105KA
LMK107BJ474KA
LMK107BJ224KA
NSCW215T
—
DESCRIPTION
1μF ±10%, 6.3V X5R ceramic capacitor (0603)
1μF ±10%, 6.3V X5R ceramic capacitor (0603)
0.47μF ±10%, 10V X5R ceramic capacitor (0603)
0.22μF ±10%, 10V X7R ceramic capacitor (0603)
White LEDs
±1% resistor (0603)
Chip Information
TRANSISTOR COUNT: 3655
PROCESS: BiCMOS
_______________________________________________________________________________________
7
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MAX1573ETE+T 功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX1573ETE-G104 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1573ETE-T 功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX1573ETE-TG104 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1573EVKIT 制造商:Maxim Integrated Products 功能描述:SMALLEST HIGHEST EFFICIENCY WHITE - Rail/Tube
MAX1573TQFNEVKIT 制造商:Maxim Integrated Products 功能描述:SMALLEST HIGHEST EFFICIENCY WHITE - Rail/Tube
MAX1574EEE 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1574ETB 制造商:Maxim Integrated Products 功能描述:180MA, 1X/2X, WHITE LED CHARGE PUMP IN 3MM X - Rail/Tube