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SC630
Fixed 3.3V High Output Charge Pump Buck/Boost Regulator
POWER MANAGEMENT Features
Input voltage range -- 2.9V to 5.5V VOUT tolerance 3.3V 3% VOUT regulation (line + load) 2% Continuous output current -- 400mA Peak output current -- 500mA Three charge pump modes -- 1x, 1.5x and 2x Output ripple 20mVpp for IOUT 400mA Short circuit, over-voltage, and over-temperature protection Soft-start functionality Shutdown current -- 0.1A, typical Ultra thin package -- 2 x 2 x 0.6 (mm) Fully WEEE and RoHS compliant
Description
The SC630 is a high-current voltage regulator using Semtech's proprietary low-noise charge pump technology. 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 -- the head-room needed for voltage regulation. Only two 2.2F bucket capacitors are required to deliver the full output current. The charge pump provides a low EMI solution compared to inductive buck/boost regulators. The SC630'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 20mVpp at the output. The SC630 is capable of delivering 400mA continuous current, with peak current to 500mA. A 22F output capacitor of is used for decoupling the load and for smoothing mode transitions. Hysteresis is provided to prevent chatter between charge pump modes. The micro lead-frame package is both small and thermally efficient, measuring 2 x 2 x 0.6 (mm).
Applications
Mobile phones MP3 players Multi-LED backlit LCDs Compact flash/CF+ products PMPs Digital video cameras Digital still cameras PDAs
Typical Application Circuit
CIN 22F IN OUT VOUT = 3.3V @ 400mA COUT 22F
VBAT
SC630
Chip enable EN C1+ C1C2+ GND C2C1 2.2F C2 2.2F
Patents Pending
May 28, 2008 (c) 2008 Semtech Corporation 1
SC630
Pin Configuration Ordering Information
Device
SC630ULTRT(1)(2) SC630EVB
Package
MLPD-UT-8 2x2 Evaluation Board
GND
1 TOP VIEW
8
C2-
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.
C1+
2
7
C2+
C1-
3
T
6
OUT
IN
4
5
EN
MLPD-UT-8; 2x2, 8 LEAD JA = 68C/W
Marking Information
630 yw
yw = Datecode
2
SC630
Absolute Maximum Ratings
IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 C1+, 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(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Recommended Operating Conditions
Ambient Temperature Range (C) . . . . . . . . -40 < TA < +85 IN (V) ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 < VIN < 5.5
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 = +25C for Typ, -40C to +85C for Min and Max; C1 = C2 = 2.2F (ESR < 0.03); CIN = COUT = 22F; VIN = 2.9V to 5.5V
Parameter
Input Supply Voltage Output Voltage Output Voltage Ripple
Symbol
VIN VOUT VPP
Condition
Min
2.9
Typ
Max
5.5
Units
V V mV mA
VIN = 4.2V, IOUT = 1mA IOUT 400mA Peak Load - thermally limited(1), TJ <150C, 2.85V VIN 5.5V Continuous Load, 3.1V VIN 5.5V, 1x or 1.5x mode
3.2
3.3 20
3.4
500
Maximum Output Current
IOUT
400 0.1 1.5 1.5 140 200 400 21 25 2 2.0 2.5 260
mA A mA mA kHz s mV mV
Shutdown Current
ISD
Shutdown (EN = GND), VIN = 3.6V EN high, 1x mode, IOUT = 1mA, VIN = 4.2V
Total Quiescent Current
IQ EN high, 1.5x or 2x mode, IOUT = 1mA, VIN = 3.3V
Charge Pump Frequency Start-Up Time Line Regulation Load Regulation
fPUMP tSU VLINE VLOAD
VIN = 3.2V (EN transitions from low to high), 3.2V VOUT 3.4V, No load IOUT = 1mA, 2.85V VIN 4.2V VIN Fixed, 1mA IOUT 500mA
3
SC630
Electrical Characteristics (continued)
Parameter
EN Input High Threshold EN Input Low Threshold EN Input High Current EN Input Low Current
Symbol
VIH VIL IIH IIL
Condition
VIN = 5.5V VIN = 2.7V VIN = 5.5V VIN = 5.5V 1x mode
Min
1.6
Typ
Max
Units
V
0.4 2 2 0.3 3 2.4 3.3 2.93
V A A V V
Open-Loop Output Resistance
ROUT
1.5x mode, VIN = 3.15V 2x mode, VIN = 2.93V
V TRANS 1X Mode Transition Voltage (2) V TRANS 1.5X Fault Protection Short-Circuit Current ISC
IOUT = 300mA IOUT = 300mA
VOUT = 0V, IOUT = IIN 1x mode
300 0.6 1.2
600 1.2 2.0 700 165 20
980 2.0 2.8
mA A A mA C C
Input Current Limit
ILIMIT
1.5x and 2x modes VOUT 2V, IOUT = IIN
TOTP Over Temperature (3) THYS
Rising Threshold Hysteresis
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 where a mode transition takes place in the charge pump with VIN falling. (3) Guaranteed by design - not tested in production.
4
SC630
Typical Characteristics
Load Regulation
25 VOUT = 3.3V, VIN = 3.6V 20 VOUT = 3.3V, IOUT = 1mA
Line Regulation
Output Voltage Variation -- VLOAD (mV)
20 TA=85C 15 TA=25C 10
Output Voltage Variation -- VLINE (mV)
15 85C 10 3.6V, 0mV 5 -40C 0 -5 -10 -15 -20 2.7 25C
5
TA=-40C
0
0
90
180 270 Output Current (mA)
360
450
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Efficiency versus Load Current
100 VOUT = 3.3V VIN = 3.4V 90 VIN = 3.6V VIN = 3.8V
Efficiency (%)
0 -10 -20 -30
Gain (dB)
PSRR -- 1x Mode
VIN = 4.2V, VOUT = 3.3V, IOUT = 50mA
CIN=COUT=22F (0805) C1=C2=2.2F (0603)
VIN = 4.0V 80
-40 -50 -60 -70
70
60
-80 -90
50 0 90 180 270 360 450 Load Current (mA)
-100 10
100 Frequency (Hz)
1000
10000
PSRR -- 1.5x Mode
0 -10 -20 -30 VIN = 3.2V, VOUT = 3.3V, IOUT = 50mA
CIN=COUT=22F (0805) C1=C2=2.2F (0603)
Gain (dB)
-40 -50 -60 -70 -80 -90
-100 10 100 Frequency (Hz) 1000 10000
5
SC630
Typical Characteristics (continued)
Efficiency -- 10mA
100 VOUT = 3.3V, IOUT = 10mA
Efficiency -- 50mA
100 VOUT = 3.3V, IOUT = 50mA
90 1x Mode
90 1x Mode
Efficiency(%)
80 Mode Transition Hysteresis 1.5x Mode 60
Efficiency(%)
80 Mode Transition Hysteresis 1.5x Mode 60
70
70
50 4.2 3.9 3.6 3.3 Input Voltage (V) 3.0 2.7
50 4.2
3.9
3.6 3.3 Input Voltage (V)
3.0
2.7
Efficiency -- 100mA
100 VOUT = 3.3V, IOUT = 100mA 100
Efficiency -- 200mA
VOUT = 3.3V, IOUT = 200mA
90 1x Mode
Efficiency(%)
90 1x Mode
Efficiency(%)
80 Mode Transition Hysteresis 1.5x Mode 60
80 Mode Transition Hysteresis 1.5x Mode 60 2x Mode
70
70
50 4.2 3.9 3.6 3.3 Input Voltage (V) 3.0 2.7
50 4.2
3.9
3.6 3.3 Input Voltage (V)
3.0
2.7
Efficiency -- 300mA
100 VOUT = 3.3V, IOUT = 300mA
Efficiency -- 400mA
100 VOUT = 3.3V, IOUT = 400mA 1x Mode
88
1x Mode
88
Efficiency(%)
76
Efficiency(%)
Mode Transition Hysteresis
76
1.5x Mode
1.5x Mode
64
64 Mode Transition Hysteresis
52 2x Mode
52
2x Mode
40 4.2 3.9 3.6 3.3 Input Voltage (V) 3.0 2.7
40 4.2
3.9
3.6 3.3 Input Voltage (V)
3.0
2.7
6
SC630
Typical Characteristics (continued)
Ripple -- 1x Mode
VIN=3.6V, VOUT=3.3V, IOUT=400mA
Ripple -- 1.5x Mode
VIN=3.2V, VOUT=3.3V, IOUT=400mA
VIN -PP (20mV/div)
VIN -PP (100mV/div)
VOUT -PP (20mV/div) IOUT (200mA/div) 400mA
VOUT -PP (50mV/div) IOUT (200mA/div) 400mA
CIN=COUT=22F (0805) 0mA Time (10s/div) C1=C2=2.2F (0603) 0mA
CIN=COUT=22F (0805) C1=C2=2.2F (0603) Time (10s/div)
Ripple -- 2x Mode
VIN=2.85V, VOUT=3.3V, IOUT=400mA
Startup (No Load)
VIN=3.6V, IOUT=0mA
VIN -PP (50mV/div) VEN (2V/div)- 0V-- VOUT -PP (50mV/div) IOUT (200mA/div) 400mA VOUT (2V/div)- 0V-- CIN=COUT=22F (0805) CIN=COUT=22F (0805) 0mA Time (10s/div) C1=C2=2.2F (0603) IOUT (200mA/div)- 0V-- C1=C2=2.2F (0603)
Time (200s/div)
Startup (400mA)
VIN=3.6V, IOUT=400mA
2.25
Quiescent Current
VOUT = 3.3V, IOUT = 1mA
2.00
VEN (2V/div)- 0V --
IQ(mA)
1.75
VOUT (2V/div)- 0V--
1.50 25C 1.25 -45C 85C
IOUT (200mA/div)- 0V--
CIN=COUT=22F (0805) C1=C2=2.2F (0603) Time (200s/div)
1.00
0.75 5.50
4.98
4.46
VIN (V)
3.94
3.42
2.90
7
SC630
Pin Descriptions
Pin
1 2 3 4 5 6 7 8 T
Pin Name
GND C1+ C1IN EN OUT C2+ C2Thermal Pad
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 Chip enable -- active-high Output Positive terminal of bucket capacitor 2 Negative terminal of bucket capacitor 2 This pad is for heat sinking and is not connected internally. It must be connected to a ground plane using multiple vias.
8
SC630
Block Diagram
IN 4
LDO 200kHz
2 C1+ 3 C17 C2+
EN 5
Logic Control
CHARGE PUMP
8 C26 OUT
Reference Voltage Generator
1 GND
9
SC630
Applications Information
General Description
The SC630 is a 3.3V output charge pump regulator designed to support up to 400mA (TA 85C, 3.15V 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 SC630 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 300m. 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. 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.
450 400 350
IOUT (mA)
Derating for applications requiring only 1x and 1.5x modes
300 250 200 150 100 35 45 55 65 75 85 Ambient Temperature (C) 95 105 Derating for applications requiring 2x mode
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 SC630 also provides protection circuitry that prevents the device from operating in an unspecified state. These functions include:
Thermal Resistance
The SC630 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 SC630 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 (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 250mA (typical).
Temperature Derating
The load current and battery voltage range of the application should be compared with the efficiency plots on
10
SC630
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 165C 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 20C. The following capacitors are recommended for best performance. Use only X5R ceramic with a voltage rating of 6.3V or higher. Table 1 -- Recommended Capacitors
Capacitor Value F Case Size Notes
Typical output VPP 20mV in all charge pump modes CIN , COUT 22 0805 Typical input ripple 100mV in all charge pump modes Typical performance is similar to the 22uF if 0805 capacitor size is used, due to the weaker DC voltage coefficient of the 22uF 0805. Typical output VPP as high as 75mV in boosting charge pump modes Typical input ripple as high as 175mV in boosting charge pump modes For a lower profile design, two 10uF 0603's may be substituted in place of one 10uF or 22uF 0805. Two are needed, due to the weaker DC voltage coefficient of the 0603 package size. CBUCKET CBUCKET CBUCKET 2.2 0603 Required for the full rated output current Useful for load current up to 300mA Useful for load current up to 100mA
Capacitor Selection
The SC630 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. CIN and COUT are normally 22F and the bucket capacitors C1 and C2 are 2.2F. For low profile designs, two parallel 10F capacitors may be used in place of each 22F. For applications with load currents below 100 mA, the bucket capacitors may be reduced to 1F and the input and output capacitors may be reduced to 10F. The following table lists recommended capacitor values. Note that the smallest available capacitor packages have very poor DC voltage characteristics. 0402 and 0603 size capacitors may be as low as 50% of rated value at 3.3V.
CIN , COUT
10
0805
CIN , COUT
10
0603
2.2
0402
1.0
0402
NOTE: Use only X5R type capacitors, with a 6.3V 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 35% of its rated value at 5VDC. The same value chosen in the next larger package size (0603) retains about 60% of its rated value at 5VDC.
11
SC630
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: 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. 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.
SC630
GND C2C2+ GND OUT EN
C2
C1
C1+ C1IN
COUT CIN
EN
12
SC630
Outline Drawing -- MLPD-UT-8 2x2
A D B DIMENSIONS DIM PIN 1 INDICATOR (LASER MARK) E A A1 A2 b D D1 E E1 e L N aaa bbb INCHES MIN .020 .000 .007 .075 .061 .075 .026 NOM (.006) .010 .012 .079 .083 .067 .071 .079 .083 .031 .035 .020 BSC .012 .014 .016 8 .003 .004 MAX .024 .002 MILLIMETERS MIN 0.50 0.00 NOM MAX 0.60 0.05 0.30 2.10 1.80 2.10 0.90 0.40
A aaa C A1 A2 C
SEATING PLANE
(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
D1 1 LxN E/2 E1 2
N bxN e e/2 D/2 bbb C AB
NOTES: 1. 2. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.
13
SC630
Land Pattern -- MLPD-UT-8 2x2
H R DIM C G (C) K G Z H K P R Y X Y P X Z DIMENSIONS INCHES (.077) .047 .067 .031 .020 .006 .012 .030 .106 MILLIMETERS (1.95) 1.20 1.70 0.80 0.50 0.15 0.30 0.75 2.70
NOTES: 1. 2. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 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.
3.
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
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