Datasheet

SC630A
1MHz Fixed 3.3V Output
Charge Pump Regulator
POWER MANAGEMENT
Features
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Description
Input voltage range — 2.95V to 5.5V
VOUT tolerance — 3.3V ±3%
Continuous output current — 300mA max
Three charge pump modes — 1x, 1.5x and 2x
Output ripple voltage — 33mVPP , 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
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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
The SC630A is a high-current voltage regulator using
Semtech’s proprietary low-noise charge pump technology. 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.
The SC630A’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. 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 1% of the output voltage — 33mVpp at 215mA.
A small 2.2µF capacitor is recommended for all four capacitors. 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
CIN
2.2µF
VBAT
IN
OUT
VOUT = 3.3V @ 300mA
COUT
2.2µF
SC630A
Chip
enable
EN
C1+
C1C2+
GND
C2-
C1
2.2µF
C2
2.2µF
US Patent: 7,808,220
Rev. 1.1
© 2011 Semtech Corporation
SC630A
Pin Configuration
GND
Ordering Information
1
8
C2-
TOP VIEW
C1+
2
7
C2+
C1-
3
6
OUT
5
EN
Device
Package
SC630AULTRT(1)(2)
MLPD-UT-8 2x2
SC630AEVB
Evaluation Board
Notes:
(1) 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.
T
IN
4
MLPD-UT-8; 2x2, 8 LEAD
θJA = 68°C/W
Marking Information
K0A
yw
yw = Datecode
SC630A
Absolute Maximum Ratings
Recommended Operating Conditions
IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
Ambient Temperature Range (°C). . . . . . . . . -40 < TA < +85
C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to (VOUT + 0.3)
IN (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.95 < VIN < 5.5
Pin Voltage - All Other Pins (V). . . . . . . . . . . -0.3 to (VIN + 0.3)
OUT Short Circuit Duration. . . . . . . . . . . . . . . . . . Continuous
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W). . . . . 68
Maximum Junction Temperature (°C). . . . . . . . . . . . . . . +150
Storage Temperature Range (°C). . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s 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
(1) Tested according to JEDEC standard JESD22-A114-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 JESD51 standards.
Electrical Characteristics
Unless otherwise specified: TA = +25°C for Typ, -40°C to +85°C for Min and Max; C1 = C2 = 2.2µF (ESR < 0.03Ω); CIN = COUT = 22µF; VIN = 2.95V to 5.5V
Parameter
Symbol
Condition
Min
Typ
Max
Units
Output Voltage
VOUT
VIN = 4.2V, IOUT = 1mA
3.2
3.3
3.4
V
Output Voltage Ripple
VPP
IOUT = 215mA
Continuous Load, 2.95V ≤ VIN ≤ 5.5V, 1x or 1.5x mode
33
mV
300
mA
Shutdown Current
ISD
Shutdown (EN = GND), VIN = 3.6V
0.1
2
µA
Total Quiescent Current
IQ
EN high, IOUT = 1mA
2.5
3.5
mA
Charge Pump Frequency
fPUMP
VIN = 3.2V
1
MHz
tSU
(EN transitions from low to high),
3.2V ≤ VOUT ≤ 3.4V, No load
400
µs
Line Regulation
ΔVLINE
IOUT = 1mA, 2.95V ≤ VIN ≤ 4.2V
21
mV
Load Regulation
ΔVLOAD
VIN Fixed, 1mA ≤ IOUT ≤ 300mA
25
mV
EN Input High Threshold
VIH
VIN = 5.5V
EN Input Low Threshold
VIL
VIN = 2.7V
0.4
V
EN Input High Current
IIH
VIN = 5.5V
2
µA
Start-Up Time
1.6
V
SC630A
Electrical Characteristics (continued)
Parameter
EN Input Low Current
Open-Loop Output Resistance
Mode Transition Voltage (2)
Symbol
Condition
IIL
VIN = 5.5V
Min
Typ
Max
Units
2
µA
1x mode
0.3
Ω
1.5x mode, VIN = 3.08V
4.5
Ω
2x mode, VIN = 2.95V
2.6
Ω
V TRANS 1X
IOUT = 300mA
3.35
V
V TRANS 1.5X
IOUT = 300mA
3.08
V
ISC
VOUT = 0V, IOUT = IIN
300
600
980
mA
1x mode
0.6
1.2
2.0
A
1.5x and 2x modes
1.2
2.0
2.8
A
ROUT
Fault Protection
Short-Circuit Current
Input Current Limit
Over Temperature (3)
ILIMIT
VOUT ≤ 2V, IOUT = IIN
700
mA
TOTP
Rising Threshold
165
°C
THYS
Hysteresis
20
°C
Notes:
(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 is where a mode transition takes place in the charge pump with VIN falling.
(3) Guaranteed by design — not tested in production
SC630A
Typical Characteristics
Line Regulation
Load Regulation
VOUT = 3.3V, VIN = 3.6V
-20
-15
TA=85°C
-10
TA=25°C
TA=-40°C
-5
0
0
50
VOUT = 3.3V, IOUT = 1mA
20
100
150
200
Output Current (mA)
250
300
15
Output Voltage Variation — ΔVLINE (mV)
Output Voltage Variation — ΔVLOAD (mV)
-25
25°C
10
85°C
5
-40°C
0
PSRR — 1x Mode
-5
-10
-15
-20
350
2.7
3.1
3.5
3.9
4.3
Input Voltage (V)
VOUT = 3.3V
VIN = 4.0V
80
70
60
20
50
0
100
150
200
Load Current (mA)
250
300
300mA
40
60
50
VOUT = 3.3V, CIN = COUT = C1 = C2 = 2.2µf (0603)
80
VIN = 3.8V
0
350
200mA
100mA
50mA
5.6
0
CIN = COUT = C1 = C2= 2.2µF (0603)
4.8
4.0
4.4
Input Voltage (V)
3.6
3.2
2.8
-30
-40
-40
Gain (dB)
Gain (dB)
-20
-30
-50
-60
VIN = 4.2V, VOUT = 3.3V, IOUT = 50mA
CIN = COUT = C1 = C2= 2.2µF (0603)
-10
-20
-50
-60
-70
-70
-80
-80
-90
-90
-100
10
5.2
PSRR — 1x Mode
VIN = 3.2V, VOUT = 3.3V, IOUT = 50mA
-10
10mA
1x mode
PSRR — 1.5x Mode
0
5.5
1.5x and 2x mode
VIN = 3.6V
Ripple (mV p-p)
Efficiency (%)
100
VIN = 3.4V
90
5.1
Output Ripple
Efficiency versus Load Current
100
4.7
100
Frequency (Hz)
1000
10000
-100
10
100
Frequency (Hz)
1000
10000
SC630A
Typical Characteristics (continued)
Efficiency — 10mA
100
Efficiency — 50mA
VOUT = 3.3V, IOUT = 10mA
100
90
Efficiency(%)
Efficiency(%)
90
80
1x Mode
70
Mode
Transition
Hysteresis
60
50
VOUT = 3.3V, IOUT = 50mA
80
70
5.2
4.8
4.4
4.0
Input Voltage (V)
3.6
1x Mode
1.5x Mode
60
1.5x Mode
50
5.6
3.2
2.8
5.6
5.2
Efficiency — 100mA
100
Mode
Transition
Hysteresis
4.8
4.4
4.0
Input Voltage (V)
3.6
3.2
2.8
Efficiency — 200mA
VOUT = 2.95V, IOUT = 100mA
100
90
VOUT = 3.3V, IOUT = 200mA
90
80
1x Mode
Mode
Transition
Hysteresis
70
1.5x Mode
60
50
Efficiency(%)
Efficiency(%)
1x Mode
80
Mode
Transition
Hysteresis
70
1.5x Mode
60
2x Mode
5.6
5.2
4.8
4.4
4.0
Input Voltage (V)
3.6
3.2
2.8
50
5.6
5.2
4.8
4.4
4.0
Input Voltage (V)
3.6
3.2
2.8
Efficiency — 300mA
100
VOUT = 3.3V, IOUT = 300mA
1x Mode
90
Efficiency(%)
80
1.5x Mode
70
Mode
Transition
Hysteresis
60
50
40
2x Mode
5.6
5.2
4.8
4.4
4.0
Input Voltage (V)
3.6
3.2
2.8
SC630A
Typical Characteristics (continued)
Ripple — 1.5x Mode
Ripple — 1x Mode
VIN = 3.6V, VOUT = 3.3V, IOUT = 215mA
VIN = 3.2V, VOUT = 3.3V, IOUT = 215mA
VIN -PP (100mV/div)
VIN -PP (100mV/div)
VOUT -PP (100mV/div)
VOUT -PP (100mV/div)
215mA
IOUT (200mA/div)
215mA
IOUT (200mA/div)
CIN=COUT=C1=C2=2.2µF (0603)
0mA
0mA
CIN=COUT=C1=C2=2.2µF (0603)
Time (1µs/div)
Time (1µs/div)
Startup (No Load)
Ripple — 2x Mode
VIN = 2.85V, VOUT = 3.3V, IOUT = 215mA
VIN = 3.6V, IOUT = 0mA
VEN (2V/div)–
VIN -PP (100mV/div)
0V—
VOUT -PP (100mV/div)
VOUT (2V/div)––
0V—
215mA
IOUT (200mA/div)
IOUT (200mA/div)–
0mA
0V—
CIN=COUT=C1=C2=2.2µF (0603)
CIN=COUT=C1=C2=2.2µF (0603)
Time (200µs/div)
Time (1µs/div)
Quiescent Current
Startup (215mA)
VIN = 3.6V, IOUT = 215mA
2.5
VEN (2V/div)–
VOUT = 3.3V, IOUT = 1mA
2
0V—
85°C
1.5
IQ(mA)
VOUT (2V/div)––
-45°C
0V—
1
IOUT (200mA/div)–
0.5
0V—
25°C
CIN=COUT=C1=C2=2.2µF (0603)
Time (200µs/div)
0
5.6
5.2
4.8
4.4
VIN (V)
4
3.6
3.2
2.8
SC630A
Pin Descriptions
Pin
Pin Name
Pin Function
1
GND
Ground — connect to ground plane with multiple vias
2
C1+
Positive terminal of bucket capacitor 1
3
C1-
Negative terminal of bucket capacitor 1
4
IN
Input supply voltage
5
EN
Chip enable — active-high
6
OUT
Output
7
C2+
Positive terminal of bucket capacitor 2
8
C2-
Negative terminal of bucket capacitor 2
T
Thermal Pad
This pad is for heat sinking and is not connected internally. It must be connected to a ground plane using
multiple vias.
SC630A
Block Diagram
IN 4
LDO
2 C1+
1MHz
3 C17 C2+
EN 5
Logic
Control
Reference
Voltage
Generator
CHARGE
PUMP
8 C26 OUT
1 GND
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 portable handheld equipment including Compact Flash and
CF+ products.
The load current and battery voltage range of the application should be compared with the efficiency plots on
page 6 to determine if 2x mode is required by the application. 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. 1x and 1.5x modes do not
require derating.
Mode Transition Hysteresis
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 performance, 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.
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 overtemperature 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.
350
300
IOUT (mA)
The SC630A has three operating modes — 1x, 1.5x, and
2x. The 1x mode is a linear series regulation mode with a
low output resistance of only 300mW. The 1x mode functions as a low noise series linear regulator. The 1.5x 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.
Derating for applications
requiring 2x mode
250
200
150
100
35
45
55
65
75
85
Ambient Temperature (°C)
95
105
Maximum Continuous Output
Protection Circuitry
The SC630A also provides protection circuitry that prevents the device from operating in an unspecified state.
These functions include:
•
•
•
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 1A typical. The threshold at 2V allows the device
to recover from excessive voltage droop during an over
current.
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).
10
SC630A
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 temperature drops below this threshold. Hysteresis is included
that prevents the device from re-enabling until the junction temperature is reduced by 20°C.
Table 1 — Recommended Capacitors
Size Code
mil(mm)
Value
μF
CIN , COUT
0603(1608)
2.2
C1, C2
Capacitor Selection
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 requirements 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 dielectric 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 considerably 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.
Capacitor
CIN , COUT
0402(1005)
2.2
C1, C2
CIN , COUT
0402(1005)
0.47
C1, C2
1.0
CIN , COUT
0.1
C1, C2
0402(1005)
Notes
This capacitor is required for
the full rated output current.
Typical output VPP < 100mV
in all charge pump modes.
This capacitor combination supports up to 200mA
output current with typical
output VPP < 100mV in all
charge pump modes.
This capacitor combination supports up to 100mA
output current with typical
output VPP < 100mV in all
charge pump modes.
This combination of capacitors support up to 100mA
output current with typical
output VPP < 100mV in all
charge pump modes.
The 0.1µF bucket capacitors
will increase output resistance by 2.5Ω compared to
0.47µF and larger values.
NOTE: Use only X5R type capacitors, with a 6.3V rating or higher
11
SC630A
Applications Information (continued)
PCB Layout Considerations
Poor layout can degrade the performance of the regulator and can be a contributory factor in EMI problems,
ground bounce, thermal issues, and resistive voltage
losses. Poor regulation and instability can result.
The following design rules are recommended:
. 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.
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.
3. Connect pin 1 directly to the copper area under the
thermal pad.
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.
SC630A
GND
C1
C1+
C2-
GND
C2
C2+
C1-
OUT
IN
EN
COUT
CIN
EN
12
SC630A
Outline Drawing — MLPD-UT-8 2x2
B
D
A
DIMENSIONS
DIM
E
PIN 1
INDICATOR
(LASER MARK)
A
SEATING
PLANE
aaa C
A2
A1
C
A
A1
A2
b
D
D1
E
E1
e
L
N
aaa
bbb
INCHES
MIN
.020
.000
NOM
(.006)
MILLIMETERS
MAX
.024
.002
.007
.075
.061
.075
.026
.010 .012
.079 .083
.067 .071
.079 .083
.031 .035
.020 BSC
.012
.014 .016
8
.003
.004
MIN
0.50
0.00
NOM
-
(0.1524)
0.18 0.25
1.90 2.00
1.55 1.70
1.90 2.00
0.65 0.80
0.50 BSC
0.30 0.35
8
0.08
0.10
MAX
0.60
0.05
0.30
2.10
1.80
2.10
0.90
0.40
D1
1
E/2
2
LxN
E1
N
bxN
bbb
e
C A B
e/2
D/2
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2.
COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.
13
SC630A
Land Pattern — MLPD-UT-8 2x2
H
R
(C)
DIMENSIONS
K
G
Z
Y
P
DIM
INCHES
MILLIMETERS
C
(.077)
(1.95)
G
.047
1.20
H
.067
1.70
K
.031
0.80
P
.020
0.50
R
.006
0.15
X
.012
0.30
Y
.030
0.75
Z
.106
2.70
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.
14
SC630A
© Semtech 2011
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Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
15