SC632 [SEMTECH]
Fixed 5.0V Output Charge Pump Regulator; 固定5.0V输出电荷泵稳压器
| 型号： | SC632 |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Fixed 5.0V Output Charge Pump Regulator |
| 文件： | 总14页 (文件大小：233K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC632
Fixed 5.0V Output
Charge Pump Regulator
POWER MANAGEMENT
Features
Description
Input voltage range — 2.9V to 5.5V
OUT tolerance — 5.0V ±±3
The SC6±2 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.
V
Continuous output current — 275mA
Peak output current — 500mA
Three charge pump modes — 1x, 1.5x and 2x
Output ripple ≤ ±0mVPP for IOUT ≤ 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)
Lead free and Halogen free
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.
WEEE and RoHS compliant
Applications
The SC6±2’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
operation at 200kHz, which is typically less than ±0mVpp
at the output. The SC6±2 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.
Mobile phones
MP± players
USB On-The-Go
Multi-LED backlit LCDs
Compact flash/CF+ products
PMPs
Digital video cameras
Digital still cameras
PDAs
Typical Application Circuit
VOUT = 5.0V @ 275mA
IN
OUT
CIN
22μF
COUT
VBAT
22μF
SC632
Chip
enable
C1+
C1
EN
C1-
2.2μF
C2+
C2-
C2
2.2μF
GND
Patents Pending
October 7, 2009
1
© 2009 Semtech Corporation
SC632
Pin Configuration
Ordering Information
Device
Package
SC6±2ULTRT(1)(2)
MLPD-UT-8 2x2
Evaluation Board
SC6±2EVB
Notes:
(1) Available in tape and reel only. A reel contains ±,000 devices.
(2) Lead-free packaging only. Device is WEEE and RoHS compliant,
and halogen free.
C2-
C2+
OUT
EN
GND
C1+
C1-
IN
1
2
3
4
8
7
6
5
TOP VIEW
T
MLPD-UT-8; 2x2, 8 LEAD
θJA = 68°C/W
Marking Information
632
yw
yw = Datecode
2
SC632
Absolute Maximum Ratings
Recommended Operating Conditions
IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.± to +6.0
OUT (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.± to +6.0
C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.± to (VOUT + 0.±)
Pin Voltage — All Other Pins (V) . . . . . . . . . -0.± to (VIN + 0.±)
OUT pin — Short Circuit Duration . . . . . . . . . . Continuous
ESD Protection Level(2) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ambient Temperature Range (°C) . . . . . . . . -40 ≤ TA ≤ +85
IN (V) ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 ≤ VIN ≤ 5.5
Thermal Information
Thermal Resistance, Junction to Ambient(1) (°C/W) . . . . 68
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Storage Temperature Range (°C). . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to ±0s) (°C) . . . . . . . +260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES
(1) Calculated from package in still air, mounted to ± x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
(2) Tested according to JEDEC standard JESD22-A114-B.
Electrical Characteristics
Unless otherwise specified: TA = +25°C for Typ, -40°C to +85°C for Min and Max; C1 = C2 = 2.2μF (ESR < 0.0±Ω); CIN = COUT = 22μF; VIN = 2.9V to 5.5V
Parameter
Symbol
VOUT
Condition
VIN = 4.2V, IOUT = 1mA
IOUT ≤ 400mA
Min
Typ Max
Units
V
Output Voltage
Output Voltage Ripple
4.85
5.0
±0
5.15
VPP
mV
Peak Load - thermally limited(1),
TJ <150°C, ±.±V ≤ VIN ≤ 5.5V
500
400
275
mA
mA
mA
Continuous Load,
TA ≤ 55°C, ±.15V ≤ VIN ≤ 4.2V
Maximum Output Current
IOUT
Continuous Load,
±.10V ≤ VIN ≤ 4.2V
Shutdown Current
ISD
IQ
Shutdown (EN = GND), VIN = ±.6V
EN high, IOUT = 1mA
VIN = ±.2V
0.1
1.5
2
μA
mA
kHz
Total Quiescent Current
Charge Pump Frequency
2.5
260
fPUMP
140
200
(EN transitions from low to high),
4.85V ≤ VOUT ≤ 5.15V, No load
Start-Up Time
tSU
400
μs
Line Regulation
Load Regulation
ΔVLINE
IOUT = 1mA, 2.85V ≤ VIN ≤ 4.2V
VIN =4.2V, 1mA ≤ IOUT ≤ 400mA
21
mV
mV
ΔVLOAD
±7.5
±
SC632
Electrical Characteristics (continued)
Parameter
Symbol
Condition
VIN = 5.5V
Min
Typ Max
Units
V
EN Input High Threshold
EN Input Low Threshold
EN Input High Current
EN Input Low Current
VIH
VIL
IIH
1.6
VIN = 2.7V
0.4
2
V
VIN = 5.5V
μA
μA
ꢀ
IIL
VIN = 5.5V
2
1x mode
0.25
2.85
2.9
Open-Loop Output Resistance
Mode Transition Voltage (2)
ROUT
1.5x mode, VIN = ±.7V
2x mode, VIN = ±.1V
IOUT = 200mA
IOUT = 200mA
ꢀ
ꢀ
VTRANS 1X
5.05
±.71
V
VTRANS 1.5X
V
Fault Protection
Short-Circuit Current
ISC
VOUT = 0V, IOUT = IIN
VOUT > 2V, 1x mode
VOUT > 2V, 1.5x and 2x modes
VOUT ≤ 2V, IOUT = IIN
±00
0.6
1.2
600
1.2
2.0
700
165
20
980
2.0
2.8
mA
A
Input Current Limit
ILIMIT
A
mA
°C
°C
TOTP
THYS
Rising Threshold
Over Temperature
Notes:
Hysteresis(±)
(1) Thermal limitation is dependent upon the thermal performance of the printed circuit board in support of the package standard of 68° C/W.
(2) Voltage at the IN pin where a mode transition takes place in the charge pump with VIN falling.
(±) Guaranteed by design — not tested in production.
4
SC632
Typical Characteristics
Line Regulation
Load Regulation
VOUT = 5V, VIN = 4.2V
VOUT = 5V, IOUT = 1mA
25
20
15
10
5
25
20
15
10
5
TA=25°C
85°C
25°C
TA=85°C
3.6V, 0mV
-40°C
0
TA=-40°C
-5
-10
-15
0
0
90
180
Output Current (mA)
270
360
450
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
VIN = 3.6V, VOUT = 5V, IOUT = 50mA
PSRR versus Frequency — 1.5x Mode
VIN = 4.2V, VOUT = 5V, IOUT = 50mA
0
-10
-20
-30
-40
-50
-60
-70
-80
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
CIN=COUT=22μF (0805)
C1=C2=2.2μF (060±)
CIN=COUT=22μF (0805)
C1=C2=2.2μF (060±)
-90
-100
10
1000
10000
100
10
100
1000
10000
Frequency (Hz)
Frequency (Hz)
PSRR versus Frequency — 2x Mode
VIN = 2.9V, VOUT = 5V, IOUT = 50mA
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
CIN=COUT=22μF (0805)
C1=C2=2.2μF (060±)
10
100
10000
1000
Frequency (Hz)
5
SC632
Typical Characteristics (continued)
Efficiency — 50mA
Efficiency — 10mA
VOUT = 5V, IOUT = 10mA
VOUT = 5V, IOUT = 50mA
100
100
90
80
70
60
50
90
1.5x Mode
1.5x Mode
80
Mode
Transition
Hysteresis
Mode
Transition
Hysteresis
2x Mode
70
2x Mode
60
50
4.2
3.9
3.6
3.3
3.0
2.7
3.3
3.6
Input Voltage (V)
4.2
3.9
3.0
2.7
Input Voltage (V)
Efficiency — 200mA
VOUT = 5V, IOUT = 200mA
Efficiency — 100mA
OUT = 5V, IOUT = 100mA
V
100
90
100
90
80
70
60
50
1.5x Mode
1.5x Mode
Mode
80
Transition
Hysteresis
Mode
Transition
Hysteresis
2x Mode
70
2x Mode
60
50
4.2
3.9
3.6
3.3
Input Voltage (V)
3.0
2.7
4.2
2.7
3.6
3.9
3.3
3.0
Input Voltage (V)
Efficiency — 400mA
Efficiency — 300mA
VOUT = 5V, IOUT = 300mA
VOUT = 5V, IOUT = 400mA
100
90
100
90
1.5x Mode
1.5x Mode
80
80
2x Mode
2x Mode
70
70
60
50
60
50
4.2
3.9
3.6
3.3
3.0
2.7
2.7
4.2
3.9
3.6
3.3
3.0
Input Voltage (V)
Input Voltage (V)
6
SC632
Typical Characteristics (continued)
Ripple — 1.5x Mode
VIN = 4.2V, VOUT= 5.0V, IOUT = 400mA
Ripple — 1x Mode
VIN = 5.2V, VOUT = 5.0V, IOUT = 400mA
VIN -PP (20mV/div)
VOUT -PP (20mV/div)
VIN -PP (100mV/div)
VOUT -PP (100mV/div)
IOUT (200mA/div)
400mA
400mA
0mA
IOUT (200mA/div)
CIN=COUT=22μF (0805)
C1=C2=2.2μF (060±)
CIN=COUT=22μF (0805)
C1=C2=2.2μF (060±)
0mA
Time (10μs/div)
Time (10μs/div)
Ripple — 2x Mode
VIN = ±.2V, VOUT = 5.0V, IOUT = 400mA
Startup (No Load)
VIN = ±.6V, IOUT = 0mA
VIN -PP (50mV/div)
V
EN (2V/div)–
0V—
VOUT -PP (50mV/div)
IOUT (200mA/div)
400mA
0mA
VOUT (2V/div)–
0V—
CIN=COUT=22μF (0805)
C1=C2=2.2μF (060±)
CIN=COUT=22μF (0805)
C1=C2=2.2μF (060±)
0V—
I
OUT (200mA/div)
Time (200μs/div)
Time (10μs/div)
Quiescent Current
Startup (400mA)
VOUT = 5V, IOUT = 1mA
VIN = ±.6V, IOUT = 400mA
2.5
2.0
1.5
1.0
0.5
85C
25C
VEN (2V/div)–
0V —
-45C
VOUT (2V/div)–
0V—
CIN=COUT=22μF (0805)
C1=C2=2.2μF (060±)
0V—
IOUT (200mA/div)–
Time (200μs/div)
4.20
3.94
3.68
3.42
3.16
2.90
VIN (V)
7
SC632
Pin Descriptions
Pin
1
Pin Name
GND
C1+
Pin Function
Ground — connect to ground plane with multiple vias
Positive terminal of bucket capacitor 1
Negative terminal of bucket capacitor 1
Input supply voltage
2
±
C1-
4
IN
5
EN
Chip enable — active-high
Output
6
OUT
C2+
7
Positive terminal of bucket capacitor 2
Negative terminal of bucket capacitor 2
8
C2-
This pad is for heat sinking and is not connected internally. It must be connected to a ground plane using
multiple vias.
T
Thermal Pad
8
SC632
Block Diagram
IN 4
LDO
2 C1+
200kHz
3
C1-
7
8
C2+
C2-
Logic
Control
EN
5
CHARGE
PUMP
6 OUT
Reference
Voltage
Generator
1 GND
9
SC632
Applications Information
General Description
Temperature Derating
The SC6±2 is a 5.0V output charge pump regulator
designed to support up to 400mA (TA ≤ 55°C, ±.15V ≤ VIN ≤
4.2V) and 275mA (TA ≤ 85°C, ±.15V ≤ VIN ≤ 5.5V) of continu-
ous current for powering 5.0V devices in portable
handheld equipment including Compact Flash and CF+
products.
The VIN supply range and ambient temperature range of
the application should be compared with the following
derating curve to determine the maximum safe continu-
ous load current. The DC operating points beneath each
curve are in the safe operating temperature range of the
MLP package.
450
The SC6±2 has three operating modes — 1x, 1.5x, and 2x.
The 1x mode is a linear series regulation mode with a low
open-loop output resistance of only 250mΩ. The 1x mode
functions as a low-noise series linear regulator. The 1.5x
and 2x modes are a low noise, constant frequency, con-
stant duty cycle switch mode, using two bucket capacitors.
One bucket supports the full output current while the
other bucket charges from the input. The two buckets
exchange roles in the next phase, supplying continuous
output current in both phases and reducing the need for
a large output decoupling capacitor. The constant fre-
quency, constant duty cycle operation also produces
predictable constant frequency harmonics.
400
Derating for VIN < 4.2V
350
300
Derating for VIN < 5.5V
250
200
150
45
55
75
Ambient Temp (°C)
35
65
85
95
105
Maximum Continuous Output
Mode Transition Hysteresis
Hysteresis is provided to prevent chatter between charge
pump modes for input steps of up to 120mV. Decouple
the input to prevent steps greater than 120mV, for
optimum transient performance, when the input voltage
reaches the mode transition thresholds.
Protection Circuitry
The SC6±2 also provides protection circuitry that pre-
vents the device from operating in an unspecified state.
These functions include:
• Over-Current Protection (OCP)
Thermal Resistance
• Short-Circuit Current Protection (SCCP)
The SC6±2 package is thermally efficient when the circuit
board layout connects the thermal pad through multiple
vias to the ground plane. The thermal resistance rating is
dependent upon the connection between the thermal
pad and the ground plane. A layout that is done correctly
should keep the junction temperature below the over-
temperature limit while operating the SC6±2 within the
specified electrical conditions. A poor layout may allow
the junction temperature to reach the over temperature
limit, so it is important to maintain adequate ground plane
around the device to maximize heat transfer to the PCB.
• Over-Temperature Protection (OTP)
Over-Current Protection
Over-current protection is provided to limit the output
current. When VOUT is greater than 2V, OCP limits the
output to 1A typical. The threshold at 2V allows the
device to recover from excessive voltage droop during an
over current.
10
SC632
Applications Information (continued)
Short-Circuit Current Protection
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.
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).
Over-Temperature Protection
Table 1 — Recommended Capacitors
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.
Value Case
Capacitor
Notes
ꢀF
Size
Typical output VPP ≤ 20mV in all
charge pump modes
CIN , COUT
22
0805
Typical input ripple ≤ 100mV in all
charge pump modes
Required for the full rated output
current
2.2
2.2
060±
0402
CBUCKET
CBUCKET
Capacitor Selection
The SC6±2 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 CIN and COUT are normally 22μF and the bucket
capacitors C1 and C2 are 2.2μF. For low profile designs, two
10μF capacitors may be used in place of each 22μF.
Useful for load current up to
±00mA
NOTE: Use only X5R type capacitors, with a 6.±V rating or higher
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
±53 of its rated value at 5VDC. The same value chosen in
the next larger package size, 060±, will retain about 603
of its rated value at 5VDC.
11
SC632
Applications Information (continued)
2. Place the input and output decoupling capacitors
as close as possible to the device and connect these
capacitors’ground pads together to the ground plane
using multiple vias through a short wide copper
area.
PCB Layout Considerations
Poor layout can degrade the performance of the regula-
tor and can be a contributory factor in EMI problems,
ground bounce, thermal issues, and resistive voltage
losses. Poor regulation and instability can result.
±. Connect pin 1 directly to the copper area under the
thermal pad.
The following design rules are recommended:
4. The thermal pad at the center of the device is not
electrically connected. Connect this pad to the
ground plane using multiple vias.
5. Use a ground plane to further reduce noise
interference on sensitive circuit nodes.
1. Place the bucket capacitors as close to the device as
possible and on the same side of the board. Use short
wide copper areas between the capacitor pins and
the device pins.
SC632
C2
C2-
GND
C2+
OUT
EN
C1+
C1
C1-
IN
COUT
CIN
EN
12
SC632
Outline Drawing — MLPD-UT-8 2x2
B
A
D
DIMENSIONS
INCHES MILLIMETERS
MIN NOM MAX MIN NOM MAX
DIM
-
-
-
A
.020
.000
.024 0.50
.002 0.00
0.60
0.05
E
PIN 1
INDICATOR
-
A1
A2
b
(.006)
(0.1524)
(LASER MARK)
.007
.075
D1 .061
.010 .012 0.18 0.25 0.30
.079 .083 1.90 2.00 2.10
.067 .071 1.55 1.70 1.80
.079 .083 1.90 2.00 2.10
.031 .035 0.65 0.80 0.90
D
E
E1
e
.075
.026
.020 BSC
0.50 BSC
A
C
SEATING
PLANE
L
N
aaa
.012
.014 .016
8
.003
.004
0.30
0.40
0.35
8
0.08
0.10
aaa
C
A2
A1
bbb
D1
1
2
LxN
E/2
E1
N
bxN
bbb
C A B
e
e/2
D/2
NOTES:
1.
2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
1±
SC632
Land Pattern — MLPD-UT-8 2x2
H
DIMENSIONS
INCHES
R
DIM
MILLIMETERS
(.077)
.047
.067
.031
.020
.006
.012
.030
.106
(1.95)
1.20
1.70
0.80
0.50
0.15
0.30
0.75
2.70
C
G
H
K
P
R
X
Y
Z
Z
(C)
K
G
Y
P
X
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
3. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD
SHALL BE CONNECTED TO A SYSTEM GROUND PLANE.
FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR
FUNCTIONAL PERFORMANCE OF THE DEVICE.
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 9±012
Phone: (805) 498-2111 Fax: (805) 498-±804
www.semtech.com
14
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