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PDF SC630 Data sheet ( Hoja de datos )
| Número de pieza | SC630 | |
| Descripción | Fixed 3.3V High Output Charge Pump Buck/Boost Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC630 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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SC630
Fixed 3.3V High Output
Charge Pump Buck/Boost Regulator
POWER MANAGEMENT
Features
Description
Input voltage range — 2.9V to 5.5V
V tolerance 3.3V ±3%
OUT
V regulation (line + load) ±2%
OUT
Continuous output current — 400mA
Peak output current — 500mA
Three charge pump modes — 1x, 1.5x and 2x
Output
ripple
≤
20mVpp
for
I
OUT
≤
400mA
Short circuit, over-voltage, and over-temperature
protection
Soft-start functionality
Shutdown current — 0.1μA, typical
Ultra thin package — 2 x 2 x 0.6 (mm)
Fully WEEE and RoHS compliant
Applications
Mobile phones
MP3 players
Multi-LED backlit LCDs
Compact flash/CF+ products
PMPs
Digital video cameras
Digital still cameras
PDAs
The SC630 is a high-current voltage regulator using
Semtech’s proprietary low-noise charge pump technol-
ogy. Performance is optimized for use in single Li-Ion
battery cell applications. The regulator provides the per-
formance of a linear, low drop-out (LDO) voltage regulator
when the battery is greater than 3.3V. Unlike an LDO,
drop-out is avoided when the battery is less than 3.3V.
Instead, a charge pump is activated to provide voltage
boost — the head-room needed for voltage regulation.
Only two 2.2μF bucket capacitors are required to deliver
the full output current. The charge pump provides a low
EMI solution compared to inductive buck/boost
regulators.
The SC630’s charge pump has three modes of operation:
2x, 1.5x, and 1x modes. The 2x and 1.5x modes deliver
current to the load in each of two phases. The 1x mode
turns off the charge pump, delivering current through an
LDO. When active, the charge pump provides low-ripplehttp://www.DataSheet4U.net/
operation at 200kHz, which is typically less than 20mVpp
at the output. The SC630 is capable of delivering 400mA
continuous current, with peak current to 500mA. A 22μF
output capacitor of is used for decoupling the load and for
smoothing mode transitions. Hysteresis is provided to
prevent chatter between charge pump modes.
The micro lead-frame package is both small and thermally
efficient, measuring 2 x 2 x 0.6 (mm).
Typical Application Circuit
VBAT
CIN
22μF
IN
OUT
VOUT = 3.3V @ 400mA
COUT
22μF
SC630
May 28, 2008
Chip
enable
EN
GND
C1+
C1-
C2+
C2-
C1
2.2μF
C2
2.2μF
© 2008 Semtech Corporation
Patents Pending
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
SC630
Typical Characteristics
Load Regulation
25 VOUT = 3.3V, VIN = 3.6V
20
TA=85°C
15
TA=25°C
10
5 TA=-40°C
0
0 90 180 270 360
Output Current (mA)
Efficiency versus Load Current
100 VOUT = 3.3V
90
80
VIN = 3.4V
VIN = 3.6V
VIN = 3.8V
VIN = 4.0V
70
60
50
0
90 180 270 360
Load Current (mA)
450
450
Line Regulation
20 VOUT = 3.3V, IOUT = 1mA
15
85°C
10
3.6V, 0mV
25°C
5
-40°C
0
-5
-10
-15
-20
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
PSRR — 1x Mode
0 VIN = 4.2V, VOUT = 3.3V, IOUT = 50mA
-10
-20
C =C =22μF (0805)
IN OUT
C =C =2.2μF (0603)
12
-30
http://www.DataSheet4U.net/
-40
-50
-60
-70
-80
-90
-100
10
100 1000
Frequency (Hz)
10000
PSRR — 1.5x Mode
0 VIN = 3.2V, VOUT = 3.3V, IOUT = 50mA
-10
-20
C =C =22μF (0805)
IN OUT
C1=C2=2.2μF (0603)
-30
-40
-50
-60
-70
-80
-90
-100
10
100 1000
Frequency (Hz)
10000
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
SC630
Applications Information (continued)
Over-Temperature Protection
The over-temperature circuit helps prevent the device
from overheating and experiencing a catastrophic failure.
When the junction temperature exceeds 165°C the device
is disabled. It remains disabled until the junction tempera-
ture drops below this threshold. Hysteresis is included
that prevents the device from re-enabling until the junc-
tion temperature is reduced by 20°C.
Capacitor Selection
The SC630 is designed to use low-ESR ceramic capacitors
for the input and output bypass capacitors as well as the
charge pump bucket capacitors. Ideal performance is
achieved when the bucket capacitors are exactly equal.
The value of input and output decoupling capacitors will
vary with system requirements. C and C are normally
IN OUT
22μF and the bucket capacitors C1 and C2 are 2.2μF. For
low profile designs, two parallel 10μF capacitors may be
used in place of each 22μF.
For applications with load currents below 100 mA, the
bucket capacitors may be reduced to 1μF and the input
and output capacitors may be reduced to 10μF. The fol-
lowing table lists recommended capacitor values. Note
that the smallest available capacitor packages have very
poor DC voltage characteristics. 0402 and 0603 size
capacitors may be as low as 50% of rated value
at 3.3V.
The following capacitors are recommended for best per-
formance. Use only X5R ceramic with a voltage rating of
6.3V or higher.
Table 1 — Recommended Capacitors
Capacitor
Value
μF
Case
Size
Notes
C ,C
IN OUT
Typical output V ≤ 20mV in all
PP
charge pump modes
22 0805
Typical input ripple ≤ 100mV in all
charge pump modes
CIN , COUT
Typical performance is similar to
10 0805 the 22uF if 0805 capacitor size is
used, due to the weaker DC volt-
age coefficient of the 22uF 0805.
http://www.DataSheet4U.net/
C ,C
IN OUT
C
BUCKET
C
BUCKET
C
BUCKET
Typical output V as high as
PP
75mV in boosting charge pump
modes
Typical input ripple as high as
175mV in boosting charge pump
10 0603 modes
For a lower profile design, two
10uF 0603’s may be substituted
in place of one 10uF or 22uF
0805. Two are needed, due to the
weaker DC voltage coefficient of
the 0603 package size.
Required for the full rated output
2.2 0603
current
Useful for load current up to
2.2 0402 300mA
Useful for load current up to
1.0 0402
100mA
NOTE: Use only X5R type capacitors, with a 6.3V rating or higher
The highest capacitance values in the smallest package
sizes tend to have poor DC voltage characteristics. The
highest value 0402 size capacitor retains as little as 35% of
its rated value at 5VDC. The same value chosen in the next
larger package size (0603) retains about 60% of its rated
value at 5VDC.
11
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC630.PDF ] | |
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