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PDF SC603 Data sheet ( Hoja de datos )
| Número de pieza | SC603 | |
| Descripción | CHARGE PUMP REGULATOR WITH SELECTABLE 5.0V/4.5V OUTPUT | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC603 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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POWER MANAGEMENT
Description
The SC603 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.
Only two tiny ceramic bucket capacitors are required, and
the inductorless implementation provides a reduced-EMI
solution. Low noise mode switching circuitry and con-
stant output current allow the use of extremely small
input and output capacitors.
The SC603 charge pump regulator can be used for ap-
plications that require up to 200mA of output current
with a 4.5V output. The 5.0V output version provides up
to 160mA of output current.
Compared to a switch mode regulator, the SC603 offers
a solution with less cost, area, noise and complexity.
Typical Application Circuit
SC603
CHARGE PUMP REGULATOR WITH
SELECTABLE 5.0V/4ww.5w.VDataOShUeeTt4PU.cUomT
Features
Small size - MLP Micro 10 lead 3x3mm package
Selectable 5.0V or 4.5V output voltage
200mA available with 4.5V output
160mA available with 5.0V output
Short circuit protection
Soft Start function
Shutdown current <2µA
Selectable fixed frequencies of 262kHz & 650kHz
Low ripple
Regulated to +/-5%
Ease of use
Applications
Cellular phones
LED photo flash for cellular phones
LED backlighting
PDA power supplies
Portable electronics
Electronic books
Wireless web appliances
2.7V to 6.5V
Cin
1.0uF
3 VIN
6 EN
4 FSEL
5 VSEL
U1
1
VOUT
CF1+ 2
9
CF1-
CF2+ 10
7
CF2-
GND
8
4.5V or 5.0V
Cbucket1
1.0uF
Cbucket2
1.0uF
Cout
1.0uF
UP TO 10 LEDS
November 2, 2004 1 www.semtech.com
1 page  
SC603
POWER MANAGEMENT
Applications Information
Charge Pump Function for Low Ripple
The SC603 uses a voltage doubler circuit which is imple-
mented with two switched or ‘bucket’ capactors. Most
charge pump doublers use only one bucket capacitor.
Two bucket capacitors switching on alternate phases
greatly reduce the output ripple voltage.
Over-Voltage Protection for Low Voltage Capacitors
The output is prevented from exceeding 6.0V. This fea-
ture allows the use of 6.3V ceramic capacitors.
Comparison with Other Regulation Methods
In many instances, a charge pump regulator is the best
choice for portable power applications. These regula-
tors offer many advantages over switch mode regula-
tors. A smaller bill of materials, less layout area, lower
component height, less noise, no EMF, and less overall
circuit cost are typical reasons to use this type of regula-
tion. The efficiency of a charge pump regulator often
approaches and in some cases exceeds the efficiency
of a switch mode regulator.
Inductors are often the largest and most expensive dis-
crete component in a design. There are no inductors
used in the SC603, so the inductor’s cost and layout
area are eliminated. The noise and EMF associated with
the inductor are also eliminated.
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Frequency Selection
The FSEL input is for frequency selection. A logic High
level at this input will set the clock frequency to 650kHz,
while a logic Low sets the clock to 262kHz. Input from a
µP or other device may be used to change the charge
pump frequency at any time. The optimal frequency will
depend upon the capacitor values, the load current, and
the exceptable amount of output ripple.
Ripple Performance
Examples of the output ripple, charge pump frequency
and capacitor size are listed in Table 2 Ripple Perfor-
mance.
Efficiency
Efficiency for the SC603 is defined as,
η
=
V O⋅I O
V IN⋅(2⋅I O +
I
Q)
where VO = output voltage
IO = output current
VIN = input voltage
IQ = quiescent current [from Electrical Charac-
teristics on page 2]
The SC603’s fixed frequency harmonics are an advan-
tage in portable communications equipment, such as
cellular telephones. The SC603 has distinct frequen-
cies of operation, so the harmonics are predictable. The
harmonics are not fixed in a switch mode regulator.
Switch mode regulators have harmonics which vary due
to the pulse width modulation used to regulate the out-
put. Varying harmonics can be a problem because it may
be more difficult to ensure acceptable noise perfor-
mance over the entire operating range.
Many switch mode regulators have increased voltage
ripple on the output during pulse skipping mode due to
the fact that there are large periods of time when no
current is supplied to the output. The SC603 supplies
current to the output continuously, so the voltage ripple
is less than a switch mode regulator, even with greatly
reduced output capacitance.
2004 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Outline Drawing - MLP-10
SC603
www.DataSheet4U.com
AE
PIN 1
INDICATOR
(LASER MARK)
aaa C
C
Land Pattern- MLP-M1icro2 10
LxN
B
E
A
A1
A2
C
DIMENSIONS
DIM
INCHES
MIN NOM MAX
MILLIMETERS
MIN NOM MAX
A .031 - .039 0.80 - 1.00
A1 .000 - .002 0.00 - 0.05
A2 - (.008) -
- (0.20) -
b .007 .009 .011 0.18 0.23 0.30
C .074 .079 .083 1.87 2.02 2.12
D .042 .048 .052 1.06 1.21 1.31
E .114 .118 .122 2.90 3.00 3.10
e .020 BSC
0.50 BSC
L .012 .016 .020 0.30 0.40 0.50
N 10
10
aaa .003
0.08
bbb .004
0.10
SEATING
PLANE
D
N
e bxN
bbb C A B
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.
Contact Information
2004 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SC603.PDF ] | |
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