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PDF SC632 Data sheet ( Hoja de datos )
| Número de pieza | SC632 | |
| Descripción | Fixed 5.0V Output Charge Pump Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC632 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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SC632
Fixed 5.0V Output
Charge Pump Regulator
POWER MANAGEMENT
Features
Description
Input voltage range — 2.9V to 5.5V
V tolerance — 5.0V ±3%
OUT
Continuous output current — 275mA
Peak output current — 500mA
Three charge pump modes — 1x, 1.5x and 2x
Output ripple ≤ 30mV for I ≤ 400mA
PP OUT
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
USB On-The-Go
Multi-LED backlit LCDs
Compact flash/CF+ products
PMPs
Digital video cameras
Digital still cameras
PDAs
The SC632 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 input is greater than 5.0V. Unlike an LDO, drop-
out is avoided when the input is less than 5.0V. Instead, a
charge pump is activated to provide voltage boost and
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 boost regulators.
The SC632’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-ripple
operationhttp://www.DataSheet4U.net/ at 200kHz, which is typically less than 30mVpp
at the output. The SC632 is capable of delivering 275mA
continuous current, with peak current to 500mA. A 22μF
output capacitor 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 = 5.0V @ 275mA
COUT
22μF
SC632
Chip
enable
EN
GND
C1+
C1-
C2+
C2-
C1
2.2μF
C2
2.2μF
June 19, 2008
© 2008 Semtech Corporation
Patents Pending
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
SC632
Typical Characteristics
Load Regulation
25 VOUT = 5V, VIN = 4.2V
20
TA=85°C
15
TA=25°C
10
TA=-40°C
5
0
0 90 180 270 360 450
Output Current (mA)
Line Regulation
25 VOUT = 5V, IOUT = 1mA
20
85°C
15
25°C
10
3.6V, 0mV
5
-40°C
0
-5
-10
-15
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
PSRR versus Frequency — 1.5x Mode
0 VIN = 3.6V, VOUT = 5V, IOUT = 50mA
-10 CIN=COUT=22μF (0805)
C =C =2.2μF (0603)
-20 1 2
-30
-40
-50
-60
-70
-80
-90
-100
10
100 1000
Frequency (Hz)
10000
PSRR versus Frequency — 1.5x Mode
0 VIN = 4.2V, VOUT = 5V, IOUT = 50mA
-10
-20
CIN=COUT=22μF (0805)
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 versus Frequency — 2x Mode
0 VIN = 2.9V, VOUT = 5V, IOUT = 50mA
-10
-20
C =C =22μF (0805)
IN OUT
C =C =2.2μF (0603)
12
-30
-40
-50
-60
-70
-80
-90
-100
10
100 1000
Frequency (Hz)
10000
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
SC632
Applications Information (continued)
Short-Circuit Current Protection
Short-circuit current protection is provided to limit the
current that can be sourced when the output is shorted to
ground. When a short circuit forces V to drop below 2V,
OUT
the SCCP detects the condition and limits the output
current to 600mA (typical).
When selecting capacitors for an application, first consider
the DC voltage characteristic of the capacitor. The value
of capacitance at the DC operating voltage may be con-
siderably lower than the rated value. The following table
lists recommended capacitor values which have been
chosen to minimize the impact of this limitation.
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 SC632 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. For best ripple perfor-
mance C and C are normally 22μF and the bucket
IN OUT
capacitors C1 and C2 are 2.2μF. For low profile designs, two
10μF capacitors may be used in place of each 22μF.
Table 1 — Recommended Capacitors
Capacitor
Value
μF
Case
Size
Notes
C ,C
IN OUT
C
BUCKET
C
BUCKET
Typical output V ≤ 20mV in all
PP
charge pump modes
22 0805
Typical input ripple ≤ 100mV in all
charge pump modes
Required for the full rated output
2.2 0603
current
Useful for load current up to
2.2 0402
300mA
NOTE: Use only X5R type capacitors, with a 6.3V rating or higher
http://www.DataSheet4U.net/
The highest capacitance values in the smallest package
sizes will 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, will retain about 60%
of its rated value at 5VDC.
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC632.PDF ] | |
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