Fixed 5.0V Output Charge Pump Regulator POWER MANAGEMENT Features

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Fixed 5.0V Output Charge Pump Regulator POWER MANAGEMENT Features

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SC632
Fixed 5.0V Output Charge Pump Regulator
POWER MANAGEMENT Features
Input voltage range 2.9V 5.5V VOUT tolerance 5.0V Continuous output current 275mA Peak output current 500mA Three charge pump modes 1.5x Output ripple 30mVPP IOUT 400mA Short circuit, over-voltage, over-temperature protection Soft-start functionality Shutdown current 0.1A, typical Ultra thin package (mm) Fully WEEE RoHS compliant
Description
SC632 high-current voltage regulator using Semtech's proprietary low-noise charge pump technology. Performance optimized single Li-Ion battery cell applications. regulator provides performance linear, drop-out (LDO) voltage regulator when input greater than 5.0V. Unlike LDO, dropout avoided when input less than 5.0V. Instead, charge pump activated provide voltage boost head-room needed voltage regulation. Only 2.2F bucket capacitors required deliver full output current. charge pump provides solution compared inductive boost regulators. SC632's charge pump three modes operation: 1.5x, modes. 1.5x modes deliver current load each phases. mode turns charge pump, delivering current through LDO. When active, charge pump provides low-ripple operation 200kHz, which typically less than 30mVpp output. SC632 capable delivering 275mA continuous current, with peak current 500mA. output capacitor used decoupling load smoothing mode transitions. Hysteresis provided prevent chatter between charge pump modes. micro lead-frame package both small thermally efficient, measuring (mm).
Applications
Mobile phones players On-The-Go Multi-LED backlit LCDs Compact flash/CF+ products PMPs Digital video cameras Digital still cameras PDAs
Typical Application Circuit
VBAT VOUT 5.0V 275mA COUT
SC632
Chip enable C1C2+ C2C1 2.2F 2.2F
Patents Pending
June 2008 2008 Semtech Corporation
SC632
Configuration Ordering Information
Device
SC632ULTRT(1)(2) SC632EVB
Package
MLPD-UT-8 Evaluation Board
VIEW
Notes: Available tape reel only. reel contains 3,000 devices. Lead-free package only. Device WEEE RoHS compliant.
MLPD-UT-8; 2x2, LEAD 68°C/W
Marking Information
Datecode
SC632
Absolute Maximum Ratings
-0.3 +6.0 (V). -0.3 +6.0 C1+, -0.3 (VOUT 0.3) Voltage Other Pins -0.3 (VIN 0.3) Short Circuit Duration Continuous Protection Level(2) (kV)
Recommended Operating Conditions
Ambient Temperature Range (°C)
Thermal Information
Thermal Resistance, Junction Ambient(1) (°C/W) Maximum Junction Temperature (°C) +150 Storage Temperature Range (°C) +150 Peak Reflow Temperature (10s 30s) (°C) +260
Exceeding above specifications result permanent damage device device malfunction. Operation outside parameters specified Electrical Characteristics section recommended. NOTES Calculated from package still air, mounted (in), layer with thermal vias under exposed JESD51 standards. Tested according JEDEC standard JESD22-A114-B.
Electrical Characteristics
Unless otherwise specified: +25°C Typ, -40°C +85°C Max; 2.2F (ESR 0.03); COUT 22F; 2.9V 5.5V
Parameter
Output Voltage Output Voltage Ripple
Symbol
VOUT
Condition
4.2V, IOUT IOUT 400mA Peak Load thermally limited(1), <150°C, 3.3V 5.5V
4.85
5.15
Units
Maximum Output Current
IOUT
Continuous Load, 55°C, 3.15V 4.2V Continuous Load, 3.10V 4.2V
37.5
Shutdown Current Total Quiescent Current Charge Pump Frequency Start-Up Time Line Regulation Load Regulation
fPUMP VLINE VLOAD
Shutdown GND), 3.6V high, IOUT 3.2V transitions from high), 4.85V VOUT 5.15V, load IOUT 1mA, 2.85V 4.2V =4.2V, IOUT 400mA
SC632
Electrical Characteristics (continued)
Parameter
Input High Threshold Input Threshold Input High Current Input Current
Symbol
Condition
5.5V 2.7V 5.5V 5.5V mode
Units
0.25 2.85 5.05 3.71
Open-Loop Output Resistance
ROUT
1.5x mode, 3.7V mode, 3.1V
TRANS Mode Transition Voltage TRANS 1.5X Fault Protection Short-Circuit Current
IOUT 200mA IOUT 200mA
VOUT IOUT VOUT mode
Input Current Limit
ILIMIT
VOUT 1.5x modes VOUT IOUT
TOTP Over Temperature THYS
Rising Threshold Hysteresis(3)
Notes: Thermal limitation dependent upon thermal performance printed circuit board support package standard C/W. Voltage where mode transition takes place charge pump with falling. Guaranteed design tested production.
SC632
Typical Characteristics
Load Regulation
VOUT 4.2V VOUT IOUT
Line Regulation
Output Voltage Variation VLOAD (mV)
Output Voltage Variation LINE (mV)
TA=85°C
TA=25°C
85°C 25°C 3.6V, -40°C
TA=-40°C
Output Current (mA)
Input Voltage
PSRR versus Frequency 1.5x Mode
3.6V, VOUT IOUT 50mA
PSRR versus Frequency 1.5x Mode
4.2V, VOUT IOUT 50mA
Gain (dB)
CIN=COUT=22F (0805) C1=C2=2.2F (0603)
CIN=COUT=22F (0805) C1=C2=2.2F (0603)
Gain (dB)
-100 Frequency (Hz) 1000 10000
-100
Frequency (Hz)
1000
10000
PSRR versus Frequency Mode
Gain (dB)
2.9V, VOUT IOUT 50mA
CIN=COUT=22F (0805) C1=C2=2.2F (0603)
-100 Frequency (Hz) 1000 10000
SC632
Typical Characteristics (continued)
Efficiency 10mA
VOUT IOUT 10mA
Efficiency 50mA
VOUT IOUT 50mA
1.5x Mode
1.5x Mode
Efficiency(%)
Efficiency(%)
Mode Transition Hysteresis Mode
Mode Transition Hysteresis Mode
Input Voltage
Input Voltage
Efficiency 100mA
VOUT IOUT 100mA 1.5x Mode
Efficiency 200mA
VOUT IOUT 200mA
1.5x Mode
Efficiency(%)
Efficiency(%)
Mode Transition Hysteresis Mode
Mode Transition Hysteresis
Mode
Input Voltage
Input Voltage
Efficiency 300mA
VOUT IOUT 300mA
Efficiency 400mA
VOUT IOUT 400mA
1.5x Mode
1.5x Mode
Efficiency(%)
Efficiency(%)
Mode
Mode
Input Voltage
Input Voltage
SC632
Typical Characteristics (continued)
Ripple Mode
5.2V, VOUT 5.0V, IOUT 400mA
Ripple 1.5x Mode
4.2V, VOUT= 5.0V, IOUT 400mA
(20mV/div)
(100mV/div)
VOUT (20mV/div) IOUT (200mA/div) 400mA
VOUT (100mV/div) IOUT (200mA/div) 400mA
CIN=COUT=22F (0805) Time (10s/div) C1=C2=2.2F (0603)
CIN=COUT=22F (0805) C1=C2=2.2F (0603) Time (10s/div)
Ripple Mode
3.2V, VOUT 5.0V, IOUT 400mA
Startup Load)
3.6V, IOUT
(50mV/div) (2V/div)- VOUT (50mV/div) IOUT (200mA/div) 400mA VOUT (2V/div)- CIN=COUT=22F (0805) Time (10s/div) C1=C2=2.2F (0603) IOUT (200mA/div) Time (200s/div) CIN=COUT=22F (0805) C1=C2=2.2F (0603)
Startup (400mA)
3.6V, IOUT 400mA VOUT IOUT
Quiescent Current
(2V/div)- (mA)
-45C
VOUT (2V/div)- CIN=COUT=22F (0805) IOUT (200mA/div)- Time (200s/div) C1=C2=2.2F (0603)
4.20
3.94
3.68
3.42
3.16
2.90
SC632
Descriptions
Name
C1IN C2Thermal
Function
Ground connect ground plane with multiple vias Positive terminal bucket capacitor Negative terminal bucket capacitor Input supply voltage Chip enable active-high Output Positive terminal bucket capacitor Negative terminal bucket capacitor This heat sinking connected internally. must connected ground plane using multiple vias.
SC632
Block Diagram
200kHz
Logic Control
CHARGE PUMP
Reference Voltage Generator
SC632
Applications Information
General Description
SC632 5.0V output charge pump regulator designed support 400mA 55°C, 3.3V 5.5V) 275mA 85°C, 3.15V 5.5V) continuous current powering 5.0V devices portable handheld equipment including Compact Flash products. SC632 three operating modes 1.5x, mode linear series regulation mode with open-loop output resistance only 250m. mode functions low-noise series linear regulator. 1.5x modes noise, constant frequency, constant duty cycle switch mode, using bucket capacitors. bucket supports full output current while other bucket charges from input. buckets exchange roles next phase, supplying continuous output current both phases reducing need large output decoupling capacitor. constant frequency, constant duty cycle operation also produces predictable constant frequency harmonics.
Temperature Derating
supply range ambient temperature range application should compared with following derating curve determine maximum safe continuous load current. operating points beneath each curve safe operating temperature range package.
Derating 4.2V
IOUT (mA)
Derating 5.5V
Ambient Temp (°C)
Mode Transition Hysteresis
Hysteresis provided prevent chatter between charge pump modes input steps 120mV. Decouple input prevent steps greater than 120mV, optimum transient performance, when input voltage reaches mode transition thresholds.
Maximum Continuous Output
Protection Circuitry
SC632 also provides protection circuitry that prevents device from operating unspecified state. These functions include:
Thermal Resistance
SC632 package thermally efficient when circuit board layout connects thermal through multiple vias ground plane. thermal resistance rating dependent upon connection between thermal ground plane. layout that done correctly should keep junction temperature below overtemperature limit while operating SC632 within specified electrical conditions. poor layout allow junction temperature reach over temperature limit, important maintain adequate ground plane around device maximize heat transfer PCB.
Over-Current Protection (OCP) Short-Circuit Current Protection (SCCP) Over-Temperature Protection (OTP)
Over-Current Protection Over-current protection provided limit output current. When VOUT greater than limits output typical. threshold allows device recover from excessive voltage droop during over current.
SC632
Applications Information (continued)
Short-Circuit Current Protection Short-circuit current protection provided limit current that sourced when output shorted ground. When short circuit forces VOUT drop below SCCP detects condition limits output current 600mA (typical). Over-Temperature Protection over-temperature circuit helps prevent device from overheating experiencing catastrophic failure. When junction temperature exceeds 165°C, device disabled. remains disabled until junction temperature drops below this threshold. Hysteresis included that prevents device from re-enabling until junction temperature reduced 20°C. When selecting capacitors application, first consider voltage characteristic capacitor. value capacitance operating voltage considerably lower than rated value. following table lists recommended capacitor values which have been chosen minimize impact this limitation. Table Recommended Capacitors
Capacitor Value Case Size Notes
Typical output 20mV charge pump modes COUT 0805 Typical input ripple 100mV charge pump modes 0603 Required full rated output current Useful load current 300mA
Capacitor Selection
SC632 designed low-ESR ceramic capacitors input output bypass capacitors well charge pump bucket capacitors. Ideal performance achieved when bucket capacitors exactly equal. value input output decoupling capacitors will vary with system requirements. best ripple performance COUT normally bucket capacitors 2.2F. profile designs, capacitors used place each 22F.
CBUCKET CBUCKET
0402
NOTE: only type capacitors, with 6.3V rating higher
highest capacitance values smallest package sizes will tend have poor voltage characteristics. highest value 0402 size capacitor retains little rated value 5VDC. same value chosen next larger package size, 0603, will retain about rated value 5VDC.
SC632
Applications Information (continued)
Layout Considerations
Poor layout degrade performance regulator contributory factor problems, ground bounce, thermal issues, resistive voltage losses. Poor regulation instability result. following design rules recommended: Place bucket capacitors close device possible same side board. short wide copper areas between capacitor pins device pins. Place input output decoupling capacitors close possible device connect these capacitors' ground pads together ground plane using multiple vias through short wide copper area. Connect directly copper area under thermal pad. thermal center device electrically connected. Connect this ground plane using multiple vias. ground plane further reduce noise interference sensitive circuit nodes.
SC632
COUT
SC632
Outline Drawing MLPD-UT-8
DIMENSIONS INDICATOR (LASER MARK) INCHES .020 .000 .007 .075 .061 .075 .026 .024 .002 MILLIMETERS 0.50 0.00 0.60 0.05 0.30 2.10 1.80 2.10 0.90 0.40
SEATING PLANE
(.006) .010 .012 .079 .083 .067 .071 .079 .083 .031 .035 .020 .014 .016 .012 .003 .004
(0.1524) 0.18 0.25 1.90 2.00 1.55 1.70 1.90 2.00 0.65 0.80 0.50 0.30 0.35 0.08 0.10
NOTES: CONTROLLING DIMENSIONS MILLIMETERS (ANGLES DEGREES). COPLANARITY APPLIES EXPOSED WELL TERMINALS.
SC632
Land Pattern MLPD-UT-8
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: CONTROLLING DIMENSIONS MILLIMETERS (ANGLES DEGREES). THIS LAND PATTERN REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES MET. THERMAL VIAS LAND PATTERN EXPOSED SHALL CONNECTED SYSTEM GROUND PLANE. FAILURE COMPROMISE THERMAL AND/OR FUNCTIONAL PERFORMANCE DEVICE.
Contact Information
Semtech Corporation Power Management Products Division Flynn Road, Camarillo, 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com

Fixed 5.0V Output Charge Pump Regulator POWER MANAGEMENT Features

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