SC630A [SEMTECH]
1MHz Fixed 3.3V Output Charge Pump Regulator; 1MHz固定3.3V输出电荷泵稳压器
| 型号： | SC630A |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | 1MHz Fixed 3.3V Output Charge Pump Regulator |
| 文件： | 总15页 (文件大小：412K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC630A
1MHz Fixed 3.3V Output
Charge Pump Regulator
POWER MANAGEMENT
Features
Description
Input voltage range — 2.95V to 5.5V
VOUT tolerance — 3.3V 3ꢁ
The SC630A 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 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 and the head-room
needed for regulation.
Continuous output current — 300mA max
Three charge pump modes — ꢀx, ꢀ.5x and 2x
Output ripple voltage — 33mVPP , typical
Short circuit, over-voltage, and over-temperature
protection
Soft-start functionality
Shutdown current — 0.ꢀµA, typical
Ultra thin package — 2 x 2 x 0.6 (mm)
Lead-free and halogen-free
WEEE and RoHS compliant
The SC630A’s charge pump has three modes of operation:
2x, ꢀ.5x, and ꢀx modes. The 2x and ꢀ.5x modes deliver
current to the load in each of two phases. The ꢀx mode
turns off the charge pump, delivering current through an
LDO. Hysteresis is provided to prevent chatter between
charge pump modes. When active, the charge pump pro-
vides low-ripple operation at ꢀMHz. Typically the output
ripple is ꢀꢁ of the output voltage — 33mVpp at 2ꢀ5mA.
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
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.
Set-top boxes
Typical Application Circuit
VOUT = 3.3V @ 300mA
IN
OUT
CIN
2.2µF
COUT
VBAT
2.2µF
SC630A
C1+
C1-
C2+
C2-
Chip
enable
EN
C1
2.2µF
C2
2.2µF
GND
US Patent: 7,808,220
ꢀ
Rev. ꢀ.ꢀ
© 20ꢀꢀ Semtech Corporation
SC630A
Pin Configuration
Ordering Information
Device
Package
SC630AULTRT(ꢀ)(2)
MLPD-UT-8 2x2
Evaluation Board
SC630AEVB
Notes:
(ꢀ) Available in tape and reel only. A reel contains 3,000 devices.
(2) Lead-free package 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
K0A
yw
yw = Datecode
2
SC630A
Absolute Maximum Ratings
Recommended Operating Conditions
IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
Cꢀ+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to (VOUT + 0.3)
Pin Voltage - All Other Pins (V). . . . . . . . . . . -0.3 to (VIN + 0.3)
OUT Short Circuit Duration . . . . . . . . . . . . . . . . . Continuous
ESD Protection Level(ꢀ) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ambient Temperature Range (°C) . . . . . . . . -40 < TA < +85
IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.95 < VIN < 5.5
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W). . . . . 68
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +ꢀ50
Storage Temperature Range (°C). . . . . . . . . . . . -65 to +ꢀ50
Peak IR Reflow Temperature (ꢀ0s to 30s) (°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
(ꢀ) Tested according to JEDEC standard JESD22-Aꢀꢀ4-B.
(2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD5ꢀ standards.
Electrical Characteristics
Unless otherwise specified: TA = +25°C for Typ, -40°C to +85°C for Min and Max; Cꢀ = C2 = 2.2µF (ESR < 0.03Ω); CIN = COUT = 22µF; VIN = 2.95V to 5.5V
Parameter
Symbol
VOUT
Condition
VIN = 4.2V, IOUT = ꢀmA
IOUT = 2ꢀ5mA
Min
Typ Max
Units
V
Output Voltage
Output Voltage Ripple
3.2
3.3
33
3.4
VPP
mV
Continuous Load, 2.95V ≤ VIN ≤ 5.5V, ꢀx or ꢀ.5x mode
300
mA
Shutdown Current
ISD
IQ
Shutdown (EN = GND), VIN = 3.6V
EN high, IOUT = ꢀmA
VIN = 3.2V
0.ꢀ
2.5
ꢀ
2
µA
mA
Total Quiescent Current
Charge Pump Frequency
3.5
fPUMP
MHz
(EN transitions from low to high),
Start-Up Time
tSU
400
µs
3.2V ≤ VOUT ≤ 3.4V, No load
Line Regulation
ΔVLINE
ΔVLOAD
VIH
IOUT = ꢀmA, 2.95V ≤ VIN ≤ 4.2V
VIN Fixed, ꢀmA ≤ IOUT ≤ 300mA
VIN = 5.5V
2ꢀ
25
mV
mV
V
Load Regulation
EN Input High Threshold
EN Input Low Threshold
EN Input High Current
ꢀ.6
VIL
VIN = 2.7V
0.4
2
V
IIH
VIN = 5.5V
µA
3
SC630A
Electrical Characteristics (continued)
Parameter
Symbol
Condition
VIN = 5.5V
Min
Typ Max
Units
EN Input Low Current
IIL
2
µA
Ω
Ω
Ω
V
ꢀx mode
0.3
4.5
Open-Loop Output Resistance
Mode Transition Voltage (2)
ROUT
ꢀ.5x mode, VIN = 3.08V
2x mode, VIN = 2.95V
IOUT = 300mA
2.6
VTRANS ꢀX
3.35
3.08
VTRANS ꢀ.5X
IOUT = 300mA
V
Fault Protection
Short-Circuit Current
ISC
VOUT = 0V, IOUT = IIN
ꢀx mode
300
0.6
ꢀ.2
600
ꢀ.2
2.0
700
ꢀ65
20
980
2.0
2.8
mA
A
Input Current Limit
ILIMIT
ꢀ.5x and 2x modes
VOUT ≤ 2V, IOUT = IIN
Rising Threshold
Hysteresis
A
mA
°C
°C
TOTP
THYS
Over Temperature (3)
Notes:
(ꢀ) 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 is where a mode transition takes place in the charge pump with VIN falling.
(3) Guaranteed by design — not tested in production
4
SC630A
Typical Characteristics
Line Regulation
Load Regulation
VOUT = 3.3V, VIN = 3.6V
VOUT = 3.3V, IOUT = 1mA
-25
-20
-15
-10
-5
20
15
25°C
10
5
85°C
-40°C
0
TA=85°C
TA=25°C
TA=-40°C
-5
-10
-15
0
-20
0
100
150
200
250
300
350
50
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Output Current (mA)
Input Voltage (V)
Efficiency versus Load Current
Output Ripple
VOUT = 3.3V
VOUT = 3.3V, CIN = COUT = C1 = C2 = 2.2µf (0603)
100
90
100
80
60
40
20
0
VIN = 3.4V
VIN = 3.6V
1.5x and 2x mode
VIN = 3.8V
VIN = 4.0V
80
300mA
200mA
70
60
50
100mA
50mA
10mA
1x mode
3.6
0
50
100
150
Load Current (mA)
250
300
350
5.6
5.2
4.8
4.0
4.4
Input Voltage (V)
3.2
2.8
200
PSRR — 1.5x Mode
PSRR — 1x Mode
VIN = 3.2V, VOUT = 3.3V, IOUT = 50mA
VIN = 4.2V, VOUT = 3.3V, IOUT = 50mA
0
-10
-20
-30
-40
-50
-60
-70
-80
0
-10
-20
-30
-40
CIN = COUT = Cꢀ = C2= 2.2µF (0603)
CIN = COUT = Cꢀ = C2= 2.2µF (0603)
-50
-60
-70
-80
-90
-90
-100
-100
10
100
1000
10000
10
100
10000
1000
Frequency (Hz)
Frequency (Hz)
5
SC630A
Typical Characteristics (continued)
Efficiency — 10mA
Efficiency — 50mA
VOUT = 3.3V, IOUT = 50mA
VOUT = 3.3V, IOUT = 10mA
100
100
90
80
70
60
50
90
80
1x Mode
Mode
70
Transition
Hysteresis
1x Mode
Mode
Transition
Hysteresis
1.5x Mode
60
1.5x Mode
50
5.6
5.2
4.8
4.4
4.0
3.6
3.2
2.8
5.6
5.2
4.8
4.4
4.0
3.6
3.2
2.8
Input Voltage (V)
Input Voltage (V)
Efficiency — 100mA
Efficiency — 200mA
VOUT = 2.95V, IOUT = 100mA
VOUT = 3.3V, IOUT = 200mA
100
90
100
90
80
70
1x Mode
Mode
80
1x Mode
Mode
Transition
Hysteresis
70
Transition
Hysteresis
1.5x Mode
1.5x Mode
3.6
60
50
60
50
2x Mode
5.6
5.2
4.8
4.4
4.0
3.6
3.2
2.8
5.6
5.2
4.8
4.4
4.0
3.2
2.8
Input Voltage (V)
Input Voltage (V)
Efficiency — 300mA
VOUT = 3.3V, IOUT = 300mA
100
90
1x Mode
80
70
60
50
40
1.5x Mode
Mode
Transition
Hysteresis
2x Mode
5.6
5.2
4.8
4.4
4.0
3.6
3.2
2.8
Input Voltage (V)
6
SC630A
Typical Characteristics (continued)
Ripple — 1.5x Mode
Ripple — 1x Mode
VIN = 3.6V, VOUT = 3.3V, IOUT = 2ꢀ5mA
VIN = 3.2V, VOUT = 3.3V, IOUT = 2ꢀ5mA
VIN -PP (ꢀ00mV/div)
VIN -PP (ꢀ00mV/div)
VOUT -PP (ꢀ00mV/div)
VOUT -PP (ꢀ00mV/div)
IOUT (200mA/div)
2ꢀ5mA
2ꢀ5mA
0mA
IOUT (200mA/div)
CIN=COUT=Cꢀ=C2=2.2µF (0603)
Time (1µs/div)
0mA
CIN=COUT=Cꢀ=C2=2.2µF (0603)
Time (1µs/div)
Ripple — 2x Mode
Startup (No Load)
VIN = 2.85V, VOUT = 3.3V, IOUT = 2ꢀ5mA
VIN = 3.6V, IOUT = 0mA
VEN (2V/div)–
0V—
VIN -PP (ꢀ00mV/div)
VOUT -PP (ꢀ00mV/div)
IOUT (200mA/div)
VOUT (2V/div)––
0V—
2ꢀ5mA
IOUT (200mA/div)–
0V—
0mA
CIN=COUT=Cꢀ=C2=2.2µF (0603)
Time (1µs/div)
CIN=COUT=Cꢀ=C2=2.2µF (0603)
Time (200µs/div)
Quiescent Current
Startup (215mA)
VIN = 3.6V, IOUT = 2ꢀ5mA
VOUT = 3.3V, IOUT = 1mA
2.5
2
VEN (2V/div)–
0V—
85°C
1.5
1
25°C
-45°C
VOUT (2V/div)––
0V—
IOUT (200mA/div)–
0V—
0.5
0
CIN=COUT=Cꢀ=C2=2.2µF (0603)
Time (200µs/div)
5.6
5.2
4.8
4.4
4
3.6
3.2
2.8
VIN (V)
7
SC630A
Pin Descriptions
Pin
ꢀ
Pin Name
GND
Cꢀ+
Pin Function
Ground — connect to ground plane with multiple vias
Positive terminal of bucket capacitor ꢀ
Negative terminal of bucket capacitor ꢀ
Input supply voltage
2
3
Cꢀ-
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
SC630A
Block Diagram
IN
LDO
4
5
2 C1+
1MHz
3
C1-
7
8
C2+
C2-
Logic
Control
EN
CHARGE
PUMP
6 OUT
Reference
Voltage
Generator
1 GND
9
SC630A
Applications Information
General Description
Temperature Derating
The SC630A is a 3.3V output charge pump regulator
designed to support up to 300mA (TA ≤ 85°C, 2.95V ≤ VIN ≤
5.5V) of continuous current. It is used for powering Micro
HDDs (Hard Disk Drives) and other 3.3V devices in porta-
ble handheld equipment including Compact Flash and
CF+ products.
The load current and battery voltage range of the appli-
cation should be compared with the efficiency plots on
page 6 to determine if 2x mode is required by the appli-
cation. The data provided in the following derating curve
for 2x mode is based on the peak power dissipation that
could occur while in 2x mode. ꢀx and ꢀ.5x modes do not
require derating.
The SC630A has three operating modes — ꢀx, ꢀ.5x, and
2x. The ꢀx mode is a linear series regulation mode with a
low output resistance of only 300mΩ. The ꢀx mode func-
tions as a low noise series linear regulator. The ꢀ.5x and 2x
modes are a low noise constant frequency, constant 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 frequency,
constant duty cycle operation also produces predictable
constant frequency harmonics.
350
300
Derating for applications
requiring 2x mode
250
200
150
100
35
45
55
65
75
85
95
105
Ambient Temperature (°C)
Maximum Continuous Output
Protection Circuitry
Mode Transition Hysteresis
The SC630A also provides protection circuitry that pre-
vents the device from operating in an unspecified state.
These functions include:
Hysteresis is provided to prevent chatter between charge
pump modes. The hysteresis between charge pump
modes is shown in the efficiency plots of the Typical
Characteristics section. For optimum transient perfor-
mance, the input should be decoupled to prevent steps
greater than the hysteresis voltage. Note that hysteresis is
load dependent, and increases with the load current to
prevent chatter between the charge pump modes.
• Over-Current Protection (OCP)
• Short-Circuit Current Protection (SCCP)
• 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 ꢀA typical. The threshold at 2V allows the device
to recover from excessive voltage droop during an over
current.
Thermal Resistance
The SC630A package is thermally efficient when the
circuit board layout connects the thermal pad through
multiple vias to the ground plane. The thermal resistance
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 SC630A 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.
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).
ꢀ0
SC630A
Applications Information (continued)
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 ꢀ65°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.
Size Code Value
Capacitor
Notes
mil(mm)
μF
This capacitor is required for
the full rated output current.
Typical output VPP < ꢀ00mV
in all charge pump modes.
CIN , COUT
Cꢀ, C2
0603(ꢀ608)
2.2
This capacitor combina-
tion supports up to 200mA
output current with typical
output VPP < ꢀ00mV in all
charge pump modes.
Capacitor Selection
CIN , COUT
Cꢀ, C2
The SC630A 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(ꢀ608 metric) case
size with X5R dielectric for CIN , COUT , Cꢀ and C2 capacitors
(refer to Table ꢀ).
0402(ꢀ005)
0402(ꢀ005)
2.2
This capacitor combina-
tion supports up to ꢀ00mA
output current with typical
output VPP < ꢀ00mV in all
charge pump modes.
CIN , COUT
0.47
ꢀ.0
Cꢀ, C2
CIN , COUT
This combination of capaci-
tors support up to ꢀ00mA
output current with typical
output VPP < ꢀ00mV in all
charge pump modes.
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.
0402(ꢀ005)
0.ꢀ
Cꢀ, C2
The 0.ꢀµF bucket capacitors
will increase output resis-
tance by 2.5Ω compared to
0.47µF and larger values.
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 35ꢁ of
its rated value at 5VDC. The same value chosen in the next
larger package size, 0603, will retain about 60ꢁ of its rated
value at 5VDC.
NOTE: Use only X5R type capacitors, with a 6.3V rating or higher
ꢀꢀ
SC630A
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.
3. Connect pin ꢀ 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.
ꢀ. 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.
SC630A
C2
GND
C2-
C2+
OUT
EN
C1+
C1-
C1
IN
COUT
CIN
EN
ꢀ2
SC630A
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).
ꢀ3
SC630A
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.
ꢀ4
SC630A
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Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 930ꢀ2
Phone: (805) 498-2ꢀꢀꢀ Fax: (805) 498-3804
www.semtech.com
ꢀ5
相关型号：
SC630AULTRT
Switched Capacitor Regulator, 0.3A, PDSO8, 2 X 2 MM, 0.60 MM HEIGHT, HALOGEN FREE AND ROHS COMPLIANT, MLPD-8
SEMTECH
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