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PDF SC600 Data sheet ( Hoja de datos )
| Número de pieza | SC600 | |
| Descripción | mAhXLifeTM LED Driver with 5.0V a 4.5V or 4.0V Output | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC600 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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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.
mAhxLifeTM 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.
mAhXLifeTM 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
mAhXLifeTM LED Driver with
5.0V, 4.5V, or 4.0V Outputwww.DataSheet4U.com
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
VOUT 1
CF1+ 2
9
CF1-
CF2+ 10
CF2- 7
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 www.semtech.com
1 page  
SC600
POWER MANAGEMENT
Pin Descriptions
www.DataSheet4U.com
Pin#
1
2
3
4
5
6
7
8
9
10
Pin Name Pin Function
VOUT Output voltage regulated to 5.0V, 4.5V, or 4.0V.
CF1+ Positive terminal of bucket capacitor 1.
VIN Input voltage ranging from 2.5V to 6.5V.
CD4
CX8
Bits select the charge pump operating frequency from 8kHz, 32kHz, 262kHz, and 650kHz.
Frequency selection is defined in Table 1 on page 9.
EN Active high enable. Bias current is less than 1μA when set low.
CF2-
Negative terminal of bucket capacitor 2.
GND
Ground.
CF1-
Negative terminal of buck capacitor 1.
CF2+ Positive terminal of bucket capacitor 2.
Block Diagram
VIN 3
EN 6
CX8 5
CD4 4
GND 8
CLK/16 X0
X
650kHz, 262kHz, 32kHz, or 8kHz
MODE
SELECT
DRIVERS
SWITCH
BLOCK
1 VOUT
EN
OSC
CLK/8
X1
262kHz
650kHz
X2
X3 A
B
VIN
VOUT
VREF
COMPARATORS
2 CF1+
9 CF1-
10 CF2+
7 CF2-
CX8 TIMER
CD4
VIN
© 2006 Semtech Corp.
5
www.semtech.com
5 Page 
SC600
POWER MANAGEMENT
Applications Information (Cont.)
www.DataSheet4U.com
Table 2 -Ripple Performance (Cont.)
Part No.
Freq. [kHz] IOUT [mA] Output Ripple [mVp-p] Ouput Ripple [mVp-p] COUT [μF]
1.5x mode
2x mode
SC600B(1) 4.5V
8
10
215
50 1
32 40
300
90 1
262 120
40
25 1
650 120
15
25 1
650 120
30
45 0.33
SC600D 4.0V
8
10
105
50 1
32 40
240
45 1
262 120
30
20 1
650 120
11
20 1
650 120
Note: (1) SC600C is very similar to SC600B.
25
40 0.33
CBUCKET [μF]
1
1
1
1
1
1
1
1
1
1
Mode Transition Impedance
The mode transition impedance Ro refers to the output
resistance of the charge pump before a transition to a
stronger mode occurs. Ro is dependent upon the frac-
tional charge pump, switching frequency, bucket capaci-
tor value, bucket capacitor ESR, and the internal switch
resistances.
Ro is proportional to,
1
fC
Ro can be measured to verify a low transition imped-
ance. Before measuring Ro, select the capacitors, set
the operating frequency and a constant load current. Find
the input voltage just before a weak to strong mode tran-
sition (i.e., 1.5x to 2x mode). Measure VIN, VOUT, and IOUT
before the transition.
A lower value of Ro will improve efficiency, so low ESR
ceramic capacitors are required. An X7R or X5R dielec-
tric is recommended. Y5V dielectric can require 2 to 3
times the rated value of an X7R dielectric for the same
performance over the operating temperature range.
Efficiency
Efficiency for the SC600 is defined as,
V OI O
η = V IN modeI O I Q
Ro will be,
modeV IN V OUT
Ro=
I OUT
© 2006 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SC600.PDF ] | |
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