MAX1573ETE 查看數據表（PDF） - Maxim Integrated
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MAX1573ETE Datasheet PDF : 9 Pages
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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 CIN and COUT 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
1μF
1μF
VIN
1Ω
2.2μF
C1P C1N C2P C2N
IN
OUT
1μF
2.2μF
EN1
MAX1573
LED1
EN2
LED2
SET
LED3
LED4
RSET
GND
Figure 3. C-R-C Filter Reduces Input Ripple
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 VF = 4V) are dri-
ven with 30mA per LED. The power is calculated as:
PD = [(1.5 x VIN) - VF] x 120mA = 276mW
At higher input voltages, the MAX1573 switches to 1x
mode and power dissipation decreases.
Pin Configurations (continued)
TOP VIEW
A
B
C
D
1
2
3
4
C1P
OUT
EN1
EN2
C2N
C2P
SET
IN
LED4 LED2
C1N
GND LED3 LED1
UCSP 4 ✕ 4
Table 2. Typical Component Values
COMPONENT
Input/Output
Capacitors
Transfer
Capacitors
LED
RSET
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
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