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PDF SC632A Data sheet ( Hoja de datos )
| Número de pieza | SC632A | |
| Descripción | 1MHz Fixed 5.0V Output Charge Pump Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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POWER MANAGEMENT
Features
Input voltage range — 2.95V to 5.5V
VOUT tolerance — 5.0V ±3%
Continuous output current — 275mA
Peak output current — 400mA
Three charge pump modes — 1x, 1.5x and 2x
Output ripple voltage — 50mVPP , typical
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)
Lead-free and halogen-free
WEEE and RoHS compliant
Applications
Mobile phones
Tablets
USB On-The-Go
Multi-LED backlit LCDs
Compact flash/CF+ products
Digital video cameras
DVI/HDMI ports
Wi-Fi base stations
Modems
Set-top boxes
SC632A
1MHz Fixed 5.0V Output
Charge Pump Regulator
Description
The SC632A is a high-current voltage regulator using
Semtech’s proprietary low-noise charge pump technol-
ogy. The charge pump provides a low EMI solution
compared to inductive boost regulators. Performance is
optimized for use in single Li-Ion battery cell applications.
The regulator provides the performance 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.
The SC632A’s charge pump has three modes of operation:
2x, 1.5x, and 1x modes. 2x and 1.5x are voltage boost
modes that deliver current to the load in each of two
phases. The 1x mode turns off the charge pump, deliver-
ing current through an LDO. Hysteresis is provided to
prevent chatter between charge pump modes. When
active, the charge pump provides low-ripple operation at
1MHz. Typically the output ripple is 50mVpp at the
maximum continuous current rating of 275mA.
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A small 2.2µF capacitor is recommended for all four capaci-
tors. The full rated output current is provided when 2.2µF
is used for both bucket capacitors. At the output, a 2.2µF
capacitor decouples the load and provides smoothing for
mode transitions, while another 2.2µF is used to decouple
the input.
Typical Application Circuit
VBAT
CIN IN
2.2µF
OUT
VOUT = 5.0V @ 275mA
COUT
2.2µF
SC632A
Chip
enable
EN
GND
C1+
C1-
C2+
C2-
C1
2.2µF
C2
2.2µF
Revision 1.0
© 2011 Semtech Corporation
US Patent: 7,808,220
datasheet pdf - http://www.DataSheet4U.net/
1 page  
SC632A
Typical Characteristics
VOUT= 5.0V, VIN = 4.2V
25
Load Regulation
20
TA=25°C
15
TA=85°C
TA=-40°C
10
5
0
0 80 160 240 320 400
Output Current (mA)
PSRR versus Frequency — 1x Mode
VIN = 5.25V, VOUT= 5V, IOUT = 50mA; CIN = COUT = C1 = C2 = 2.2uF (0603)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
100 1000
Frequency (Hz)
10000
Line Regulation
VOUT= 5.0V, IOUT = 1mA
25
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
Input Voltage (V)
5.1 5.5
Output Ripple
VOUT= 5V; CIN = COUT = C1 = C2 = 2.2uF (0603)
120
100 400mA
80
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60
1.5x and 2x mode
300mA
200mA
40
20
0
5.6
1x mode
5.2
4.8 4.4 4.0
Input Voltage (V)
3.6
100mA
50mA
10mA
3.2 2.8
PSRR versus Frequency — 1.5x Mode
VIN = 4.2V, VOUT= 5V, IOUT = 50mA; CIN = COUT = C1 = C2 = 2.2uF (0603)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
100 1000
Frequency (Hz)
10000
PSRR versus Frequency — 2x Mode
VIN = 2.9V, VOUT= 5V, IOUT = 50mA; CIN = COUT = C1 = C2 = 2.2uF (0603)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
100 1000
Frequency (Hz)
10000
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
SC632A
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 VOUT to drop below 2V,
the SCCP detects the condition and limits the output
current to 600mA (typical).
Table 1 — Recommended Capacitors
Size Code
mil(mm)
Value
μF
Capacitor
Notes
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 SC632A is designed to use low-ESR ceramic capacitors
for the input and output bypass capacitors as well as the
charge pump bucket capacitors. The value of input, output
and decoupling capacitors will vary with system require-
ments for ripple and output current. Performance as
shown in the Typical Characteristic section is expected
when using 2.2µF capacitors in the 0603(1608 metric) case
size with X5R dieletric for CIN , COUT , C1 and C2 capacitors
(refer to Table 1).
Consider the DC voltage characteristic of the capacitor
when choosing capacitors for an application. The value of
capacitance at the DC operating voltage may be consider-
ably lower than the rated value. The following table lists
recommended capacitor values which have been chosen
to minimize the impact of this limitation.
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, will retain about 60% of its rated
value at 5VDC.
0603(1608)
CIN , COUT
2.2
C1, C2
0402(1005)
CIN , COUT
2.2
C1, C2
0402(1005)
0.47
CIN , COUT
C1, C2
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1.0 CIN , COUT
0402(1005)
0.1 C1, C2
This capacitor is required for
the full rated output current.
Typical output VPP < 100mV
in all charge pump modes.
This capacitor combina-
tion supports up to 200mA
output current with typical
output VPP < 100mV in all
charge pump modes.
This capacitor combina-
tion supports up to 100mA
output current with typical
output VPP < 100mV in all
charge pump modes.
This combination of capaci-
tors support up to 100mA
output current with typical
output VPP < 100mV in all
charge pump modes.
The 0.1µF bucket capaci-
tors will increase output
resistance by 2.5Ω compared
to 0.47µF and larger values.
So, at 100mA output the 1.5x
to 2x mode transition will be
200mV higher.
NOTE: Use only X5R type capacitors, with a 6.3V rating or higher
11
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11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SC632A.PDF ] | |
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