MAX1573 Maxim Integrated Products, MAX1573 Datasheet - Page 7

• Manufacturer Part Number: MAX1573
• Description: White LED 1x/1.5x Charge Pump
• Manufacturer: Maxim Integrated Products

Table 2. Typical Component Values
Figure 3. C-R-C Filter Reduces Input Ripple
TRANSISTOR COUNT: 3655
PROCESS: BiCMOS
Input/Output
Capacitors
Transfer
Capacitors
LED
R
COMPONENT
V
SET
IN
2.2µF
1Ω
R SET
2.2µF
EN1
EN2
SET
IN
VALUE (µF)
As required
White LED 1x/1.5x Charge Pump in UCSP
_______________________________________________________________________________________
C1P C1N
0.47
0.22
—
1
1
1µF
MAX1573
GND
Chip Information
C2P C2N
MANUFACTURER
1µF
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Panasonic
Nichia
OUT
LED1
LED2
LED3
LED4
1µF
LMK107BJ474KA
LMK107BJ224KA
JMK107BJ105KA
JMK107BJ105KA
NSCW215T
PART
—
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
ven with 30mA per LED. The power is calculated as:
At higher input voltages, the MAX1573 switches to 1x
mode and power dissipation decreases.
P
D
= [(1.5 x V
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)
IN
) - V
DESCRIPTION
F
] x 120mA = 276mW
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F
= 4V) are dri-
7