SC632A [SEMTECH]
1MHz Fixed 5.0V Output Charge Pump Regulator; 1MHz固定5.0V输出电荷泵稳压器
| 型号： | SC632A |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | 1MHz Fixed 5.0V Output Charge Pump Regulator |
| 文件： | 总15页 (文件大小：490K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC632A
1MHz Fixed 5.0V Output
Charge Pump Regulator
POWER MANAGEMENT
Features
Description
The SC6±2A 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.
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 — ꢀx, ꢀ.5x and 2x
Output ripple voltage — 50mVPP , 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
The SC6±2A’s charge pump has three modes of operation:
2x, ꢀ.5x, and ꢀx modes. 2x and ꢀ.5x are voltage boost
modes that deliver current to the load in each of two
phases. The ꢀx 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
ꢀMHz. Typically the output ripple is 50mVpp at the
maximum continuous current rating of 275mA.
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
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 = 5.0V @ 275mA
IN
OUT
CIN
2.2µF
COUT
VBAT
2.2µF
SC632A
Chip
enable
C1+
C1-
EN
C1
2.2µF
C2+
C2-
C2
2.2µF
GND
US Patent: 7,808,220
ꢀ
Revision ꢀ.0
© 20ꢀꢀ Semtech Corporation
SC632A
Pin Configuration
Ordering Information
Device
Package
SC6±2AULTRT(ꢀ)(2)
MLPD-UT-8 2x2
Evaluation Board
SC6±2AEVB
Notes:
(ꢀ) 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
K2A
yw
Yw = Datecode
2
SC632A
Absolute Maximum Ratings
Recommended Operating Conditions
IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.± to +6.0
OUT (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.± to +6.0
Cꢀ+, 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ambient Temperature Range (°C) . . . . . . . . -40 ≤ TA ≤ +85
IN (V) ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.95 ≤ VIN ≤ 5.5
Thermal Information
Thermal Resistance, Junction to Ambient(ꢀ) (°C/W) . . . . 68
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +ꢀ50
Storage Temperature Range (°C). . . . . . . . . . . . -65 to +ꢀ50
Peak IR Reflow Temperature (ꢀ0s 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
(ꢀ) Calculated from package in still air, mounted to ± x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD5ꢀ standards.
(2) Tested according to JEDEC standard JESD22-Aꢀꢀ4-B.
Electrical Characteristics
Unless otherwise specified: TA = +25°C for Typ, -40°C to +85°C for Min and Max; CIN = COUT = Cꢀ = C2 = 2.2µF (ESR < 0.0±Ω); VIN = 2.95V to 5.5V
Parameter
Symbol
VOUT
Condition
VIN = 4.2V, IOUT = ꢀmA
IOUT = 275mA
Min
Typ Max
Units
V
Output Voltage
Output Voltage Ripple
4.85
5.0
50
5.ꢀ5
VPP
mV
Peak Load - thermally limited(ꢀ),
TJ <ꢀ50°C, ±.4V ≤ VIN ≤ 5.5V
400
275
mA
mA
Maximum Output Current
IOUT
Continuous Load,
±.ꢀ0V ≤ VIN ≤ 4.2V
Shutdown Current
ISD
IQ
Shutdown (EN = GND), VIN = ±.6V
EN high, IOUT = ꢀmA
VIN = ±.2V
0.ꢀ
2.5
ꢀ
2
µA
mA
Total Quiescent Current
Charge Pump Frequency
±.5
fPUMP
MHz
(EN transitions from low to high),
4.85V ≤ VOUT ≤ 5.ꢀ5V, No load
Start-Up Time
tSU
400
µs
Line Regulation
Load Regulation
ΔVLINE
IOUT = ꢀmA, 2.95V ≤ VIN ≤ 4.2V
VIN =4.2V, ꢀmA ≤ IOUT ≤ 400mA
2ꢀ
mV
mV
ΔVLOAD
±7.5
±
SC632A
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
ꢀ.6
VIN = 2.95V
0.4
2
V
VIN = 5.5V
µA
µA
Ω
IIL
VIN = 5.5V
2
ꢀx mode
0.25
±.5
Open-Loop Output Resistance
Mode Transition Voltage (2)
ROUT
ꢀ.5x mode, VIN = ±.7V
2x mode, VIN = ±.ꢀV
IOUT = 200mA
IOUT = 200mA
Ω
4.5
Ω
VTRANS ꢀX
5.05
±.8
V
VTRANS ꢀ.5X
V
Fault Protection
Short-Circuit Current
ISC
VOUT = 0V, IOUT = IIN
VOUT > 2V, ꢀx mode
VOUT > 2V, ꢀ.5x and 2x modes
VOUT ≤ 2V, IOUT = IIN
±00
0.6
ꢀ.2
600
ꢀ.2
2.0
700
ꢀ65
20
980
2.0
2.8
mA
A
Input Current Limit
ILIMIT
A
mA
°C
°C
TOTP
THYS
Rising Threshold
Over Temperature
Notes:
Hysteresis(±)
(ꢀ) 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
SC632A
Typical Characteristics
Line Regulation
Load Regulation
VOUT= 5.0V, VIN = 4.2V
VOUT= 5.0V, IOUT = ꢀmA
25
20
15
10
5
25
20
15
10
5
85°C
TA=25°C
TA=85°C
25°C
3.6V, 0mV
TA=-40°C
-40°C
0
-5
-10
-15
0
0
80
160
240
320
400
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Output Current (mA)
Input Voltage (V)
PSRR versus Frequency — 1x Mode
VIN = 5.25V, VOUT= 5V, IOUT = 50mA; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
Output Ripple
VOUT= 5V; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
120
100
0
-10
400mA
-20
-30
-40
80
60
40
20
0
300mA
200mA
1.5x and 2x mode
-50
-60
100mA
50mA
-70
-80
10mA
-90
1x mode
-100
5.6
5.2
4.8
4.0
4.4
Input Voltage (V)
3.6
3.2
2.8
10
100
1000
10000
Frequency (Hz)
PSRR versus Frequency — 2x Mode
VIN = 2.9V, VOUT= 5V, IOUT = 50mA; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
PSRR versus Frequency — 1.5x Mode
VIN = 4.2V, VOUT= 5V, IOUT = 50mA; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
0
0
-10
-10
-20
-30
-40
-20
-30
-40
-50
-60
-50
-60
-70
-70
-80
-80
-90
-90
-100
-100
10
100
1000
10000
10
100
1000
10000
Frequency (Hz)
Frequency (Hz)
5
SC632A
Typical Characteristics (continued)
Efficiency — 50mA
VOUT= 5.0V, IOUT = 50mA, TA = 25°C
Efficiency — 10mA
VOUT= 5.0V, IOUT = ꢀ0mA, TA = 25°C
100
100
90
1x Mode
Mode
Transition
Hysteresis
90
1x Mode
1x Mode
Mode
Transition
Hysteresis
2x Mode
1x Mode
80
70
60
50
40
30
80
Mode
Transition
Hysteresis
1.5x Mode
2x Mode
Mode
Transition
Hysteresis
70
60
50
40
30
1.5x Mode
1.5x Mode
2x Mode
2x Mode
1.5x 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
3.6
3.2
2.8
Input Voltage (V)
Input Voltage (V)
Efficiency — 200mA
VOUT= 5.0V, IOUT = 200mA, TA = 25°C
Efficiency — 100mA
VOUT= 5.0V, IOUT = ꢀ00mA, TA = 25°C
100
100
90
1x Mode
1x Mode
Mode
Mode
Transition
Hysteresis
Transition
90
80
70
60
50
40
30
Hysteresis
1x Mode
1x Mode
2x Mode
80
2x Mode
Mode
Transition
Hysteresis
1.5x Mode
1.5x Mode
1.5x Mode
Mode
Transition
Hysteresis
70
1.5x Mode
2x Mode
60
50
40
30
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
3.6
3.2
2.8
Input Voltage (V)
Input Voltage (V)
Efficiency — 400mA
VOUT= 5.0V, IOUT = 400mA, TA = 25°C
Efficiency — 300mA
VOUT= 5.0V, IOUT = ±00mA, TA = 25°C
100
90
100
90
1x Mode
Mode
1x Mode
Mode
Transition
Hysteresis
1x
Transition
Hysteresis
1.5x Mode
Mode
80
80
1.5x Mode
Mode
2x Mode
2x Mode
70
60
50
40
30
70
60
50
40
30
Transition
Mode Transition
Hysteresis
Hysteresis
2x Mode
1.5x Mode
1x
Mode
2x Mode
1.5x 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
3.6
3.2
2.8
Input Voltage (V)
Input Voltage (V)
6
SC632A
Typical Characteristics (continued)
Ripple — 1.5x Mode
VIN = 4.2V, VOUT= 5.0V, IOUT = 275mA; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
Ripple — 1x Mode
VIN = 5.2V, VOUT = 5.0V, IOUT = 275mA; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
VIN -PP (ꢀ00mV/div)
VIN -PP (ꢀ00mV/div)
VOUT -PP (ꢀ00mV/div)
VOUT -PP (ꢀ00mV/div)
IOUT (200mA/div)
275mA
0mA
275mA
IOUT (200mA/div)
0mA
Time (400ns/div)
Time (400ns/div)
Ripple — 2x Mode
Startup (No Load)
VIN = ±.2V, VOUT = 5.0V, IOUT = 275mA; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
VIN = ±.6V, IOUT = 0mA; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
VEN (2V/div)–
0V—
VIN -PP (ꢀ00mV/div)
VOUT -PP (ꢀ00mV/div)
VOUT (2V/div)–
0V—
275mA
IOUT (200mA/div)
0V—
0mA
IOUT (200mA/div)
Time (200µs/div)
Time (400ns/div)
Quiescent Current
Startup (400mA)
VOUT = 5V, IOUT = ꢀmA
VIN = ±.6V, IOUT = 400mA; CIN = COUT = Cꢀ = C2 = 2.2uF (060±)
4
3.5
VEN (2V/div)–
0V —
2x Mode
1.5x Mode
3
2.5
2
2x Mode
VOUT (2V/div)–
0V—
1x Mode
1.5x Mode
1x Mode
0V—
–
1.5
1
IOUT (200mA/div)
Time (200µs/div)
5.6
5.2
4.8
4.4
4.0
3.6
3.2
2.8
Input Voltage (V)
7
SC632A
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
±
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
SC632A
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
SC632A
Applications Information
General Description
Temperature Derating
The SC6±2A is a 5.0V output charge pump regulator
designed to support up to ±00mA (TA ≤ 80°C, ±.ꢀ5V ≤ VIN ≤
4.2V) and 275mA (TA ≤ 85°C, ±.ꢀ5V ≤ 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±2A has three operating modes — ꢀx, ꢀ.5x, and
2x. The ꢀx mode is a linear series regulation mode with a
low open-loop output resistance of only 250mW. The ꢀx
mode functions 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 con-
tinuous 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.
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 ꢀ20mV. Decouple
the input to prevent steps greater than ꢀ20mV, for
optimum transient performance, when the input voltage
reaches the mode transition thresholds.
Protection Circuitry
The SC6±2A 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)
• Over-Temperature Protection (OTP)
The SC6±2A 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±2A 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-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.
ꢀ0
SC632A
Applications Information (continued)
Short-Circuit Current Protection
Table 1 — Recommended Capacitors
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).
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.
Over-Temperature Protection
CIN , COUT
Cꢀ, C2
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.
060±(ꢀ608)
2.2
This capacitor combina-
tion supports up to 200mA
output current with typical
output VPP < ꢀ00mV in all
charge pump modes.
CIN , COUT
Cꢀ, C2
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.
Capacitor Selection
CIN , COUT
The SC6±2A 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 060±(ꢀ608 metric) case
size with X5R dieletric for CIN , COUT , Cꢀ and C2 capacitors
(refer to Table ꢀ).
0.47
ꢀ.0
Cꢀ, C2
This combination of capaci-
tors support up to ꢀ00mA
output current with typical
output VPP < ꢀ00mV in all
charge pump modes.
CIN , COUT
0402(ꢀ005)
The 0.ꢀµF bucket capaci-
tors will increase output
resistance by 2.5Ω compared
to 0.47µF and larger values.
So, at ꢀ00mA output the ꢀ.5x
to 2x mode transition will be
200mV higher.
0.ꢀ
Cꢀ, C2
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.
NOTE: Use only X5R type capacitors, with a 6.±V rating or higher
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 ±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.
ꢀꢀ
SC632A
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 ꢀ 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.
SC632A
C2
C2-
GND
C2+
OUT
EN
C1+
C1-
C1
IN
COUT
CIN
EN
ꢀ2
SC632A
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).
ꢀ±
SC632A
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.
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