SC600 Datasheet, PDF (1/19 Pages) Semtech Corporation – mAhXLifeTM LED Driver with 5.0V, 4.5V, or 4.0V Output

POWER MANAGEMENT
Description
The SC600 is a versatile charge pump designed for use
in battery operated power supply applications. The wide
input range is matched for Li-Ion battery applications.
mAhxLife^TM LED Drivers feature a fractional charge pump
implementation with efficiency comparable to a switching
regulator without costly inductors. Only two tiny ceramic
capacitors are required, and the inductorless implemen-
tation provides a reduced-EMI solution. Patented low
noise mode switching circuitry and constant output cur-
rent allow the use of extremely small input and output
capacitors.
The SC600 charge pump can be used for applications
that require up to 120mA of output current with a 4.0V
or 4.5V output. The 5.0V output version provides up to
60mA of output current.
mAhXLife^TM LED drivers replace switched mode power
supplies and provide comparable efficiency with less cost,
area, noise, and complexity.
Typical Efficiency
100
90% of Li-Ion
Battery Life
90
SC600A
80
5.0V@60mA
SC600
mAhXLife^TM LED Driver with
5.0V, 4.5V, or 4.0V Output
Features
‹ Small size - MLPD 10 lead 3x3mm or MSOP-10
package allows for a complete solution in .05 sq. in.
‹ Peak efficiency over 90% (extends battery life)
‹ Four component versions available
‹ 60mA versions available in 5.0V and 4.5V output
‹ 120mA versions available in 4.5V and 4.0V output
‹ Short-circuit and over-temperature protection
‹ Soft-start function
‹ Shutdown current <1μA
‹ Selectable fixed frequencies of 8kHz, 32kHz,
262kHz and 650kHz
‹ Low input and output ripple
‹ Regulated to ± 5%
‹ Ease of use
Applications
‹ Cellular phones
‹ LED backlighting
‹ PDA power supplies
‹ Portable electronics
‹ Electronic books
‹ Handheld computers
‹ Wireless web appliances
70
60
Device with Only 2x Mode
5.0V@60mA
50
4.2
4.0
3.8
3.6
3.4
3.2
3.0
Input Voltage [V]
Typical Application Circuit
2.7V to 6.5V
Cin
1.0uF
3 _VIN
6 _EN
4 _CD4
5
CX8
U1
1
VOUT
2
CF1+
9
CF1-
10
CF2+
7
CF2-
GND
8
4.0V, 4.5V or 5.0V
Cbucket1
1.0uF
Cout
0.33uF
Cbucket2
1.0uF
UP TO 6 LEDS
January 9, 2006
1
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