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SC632
Fixed 5.0V Output Charge Pump Regulator
POWER MANAGEMENT Features
Input voltage range -- 2.9V to 5.5V VOUT tolerance -- 5.0V 3% Continuous output current -- 275mA Peak output current -- 500mA Three charge pump modes -- 1x, 1.5x and 2x Output ripple 30mVPP 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 SC632 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 input is greater than 5.0V. Unlike an LDO, dropout 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. 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 boost regulators. The SC632'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 30mVpp at the output. The SC632 is capable of delivering 275mA continuous current, with peak current to 500mA. A 22F output capacitor 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 USB On-The-Go Multi-LED backlit LCDs Compact flash/CF+ products PMPs Digital video cameras Digital still cameras PDAs
Typical Application Circuit
VBAT CIN 22F IN OUT VOUT = 5.0V @ 275mA COUT 22F
SC632
Chip enable EN C1+ C1C2+ GND C2C1 2.2F C2 2.2F
Patents Pending
June 19, 2008 (c) 2008 Semtech Corporation 1
SC632
Pin Configuration Ordering Information
Device
SC632ULTRT(1)(2) SC632EVB
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
632 yw
yw = Datecode
2
SC632
Absolute Maximum Ratings
IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 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 pin -- Short Circuit Duration . . . . . . . . . . Continuous ESD Protection Level(2) (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(1) (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) 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. (2) Tested according to JEDEC standard JESD22-A114-B.
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
Output Voltage Output Voltage Ripple
Symbol
VOUT VPP
Condition
VIN = 4.2V, IOUT = 1mA IOUT 400mA Peak Load - thermally limited(1), TJ <150C, 3.3V VIN 5.5V
Min
4.85
Typ
5.0 30
Max
5.15
Units
V mV mA
500
Maximum Output Current
IOUT
Continuous Load, TA 55C, 3.15V VIN 4.2V Continuous Load, 3.10V VIN 4.2V
400
mA
275 0.1 1.5 140 200 400 21 37.5 2 2.5 260
mA A mA kHz s mV mV
Shutdown Current Total Quiescent Current Charge Pump Frequency Start-Up Time Line Regulation Load Regulation
ISD IQ fPUMP tSU VLINE VLOAD
Shutdown (EN = GND), VIN = 3.6V EN high, IOUT = 1mA VIN = 3.2V (EN transitions from low to high), 4.85V VOUT 5.15V, No load IOUT = 1mA, 2.85V VIN 4.2V VIN =4.2V, 1mA IOUT 400mA
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SC632
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 0.25 2.85 2.9 5.05 3.71
V A A V V
Open-Loop Output Resistance
ROUT
1.5x mode, VIN = 3.7V 2x mode, VIN = 3.1V
V TRANS 1X Mode Transition Voltage (2) V TRANS 1.5X Fault Protection Short-Circuit Current ISC
IOUT = 200mA IOUT = 200mA
VOUT = 0V, IOUT = IIN VOUT > 2V, 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
VOUT > 2V, 1.5x and 2x modes VOUT 2V, IOUT = IIN
TOTP Over Temperature THYS
Rising Threshold Hysteresis(3)
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
SC632
Typical Characteristics
Load Regulation
25 VOUT = 5V, VIN = 4.2V 25 VOUT = 5V, IOUT = 1mA
Line Regulation
Output Voltage Variation -- VLOAD (mV)
Output Voltage Variation -- V LINE (mV)
20 TA=85C 15
TA=25C
20 85C 15 25C 10 3.6V, 0mV 5 0 -5 -10 -15 -40C
10
TA=-40C
5
0
0
90
180 270 Output Current (mA)
360
450
2.7
3.1
3.5
3.9 4.3 Input Voltage (V)
4.7
5.1
5.5
PSRR versus Frequency -- 1.5x Mode
0 -10 -20 -30 VIN = 3.6V, VOUT = 5V, IOUT = 50mA
PSRR versus Frequency -- 1.5x Mode
0 VIN = 4.2V, VOUT = 5V, IOUT = 50mA -10 -20 -30
Gain (dB)
CIN=COUT=22F (0805) C1=C2=2.2F (0603)
CIN=COUT=22F (0805) C1=C2=2.2F (0603)
Gain (dB)
-40 -50 -60 -70 -80 -90
-40 -50 -60 -70 -80 -90
-100 10 100 Frequency (Hz) 1000 10000
-100
10
100 Frequency (Hz)
1000
10000
PSRR versus Frequency -- 2x Mode
0 -10 -20 -30
Gain (dB)
VIN = 2.9V, VOUT = 5V, IOUT = 50mA
CIN=COUT=22F (0805) C1=C2=2.2F (0603)
-40 -50 -60 -70 -80 -90 -100 10 100 Frequency (Hz) 1000 10000
5
SC632
Typical Characteristics (continued)
Efficiency -- 10mA
100 VOUT = 5V, IOUT = 10mA
100
Efficiency -- 50mA
VOUT = 5V, IOUT = 50mA
90 1.5x Mode
90 1.5x Mode
Efficiency(%)
Efficiency(%)
80 Mode Transition Hysteresis 2x Mode
80 Mode Transition Hysteresis 2x Mode
70
70
60
60
50 4.2
3.9
3.6 3.3 Input Voltage (V)
3.0
2.7
50 4.2
3.9
3.3 3.6 Input Voltage (V)
3.0
2.7
Efficiency -- 100mA
100 VOUT = 5V, IOUT = 100mA 1.5x Mode 90
Efficiency -- 200mA
100 VOUT = 5V, IOUT = 200mA
90 1.5x Mode
Efficiency(%)
80
Efficiency(%)
Mode Transition Hysteresis 2x Mode
80
Mode Transition Hysteresis
2x Mode
70
70
60
60
50 4.2
3.9
3.6
3.3
3.0
2.7
50 4.2
3.9
3.6
Input Voltage (V)
3.3 Input Voltage (V)
3.0
2.7
Efficiency -- 300mA
100 VOUT = 5V, IOUT = 300mA
Efficiency -- 400mA
100 VOUT = 5V, IOUT = 400mA
90
90
1.5x Mode
1.5x Mode
Efficiency(%)
Efficiency(%)
80 2x Mode 70
80 2x Mode 70
60
60
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
6
SC632
Typical Characteristics (continued)
Ripple -- 1x Mode
VIN = 5.2V, VOUT = 5.0V, IOUT = 400mA
Ripple -- 1.5x Mode
VIN = 4.2V, VOUT= 5.0V, IOUT = 400mA
VIN -PP (20mV/div)
VIN -PP (100mV/div)
VOUT -PP (20mV/div) IOUT (200mA/div) 400mA
VOUT -PP (100mV/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 = 3.2V, VOUT = 5.0V, 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) 0mA Time (10s/div) C1=C2=2.2F (0603) 0V-- IOUT (200mA/div) Time (200s/div) CIN=COUT=22F (0805) C1=C2=2.2F (0603)
Startup (400mA)
VIN = 3.6V, IOUT = 400mA VOUT = 5V, IOUT = 1mA
Quiescent Current
2.5
85C
25C
VEN (2V/div)- 0V -- IQ (mA)
2.0
1.5
-45C
VOUT (2V/div)- 0V-- CIN=COUT=22F (0805) 0V-- IOUT (200mA/div)- Time (200s/div) C1=C2=2.2F (0603)
1.0
0.5 4.20
3.94
3.68
VIN (V)
3.42
3.16
2.90
7
SC632
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
SC632
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
SC632
Applications Information
General Description
The SC632 is a 5.0V output charge pump regulator designed to support up to 400mA (TA 55C, 3.3V VIN 5.5V) and 275mA (TA 85C, 3.15V VIN 5.5V) of continuous current for powering 5.0V devices in portable handheld equipment including Compact Flash and CF+ products. The SC632 has three operating modes -- 1x, 1.5x, and 2x. The 1x mode is a linear series regulation mode with a low open-loop output resistance of only 250m. 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.
Temperature Derating
The VIN supply range and ambient temperature range of the application should be compared with the following derating curve to determine the maximum safe continuous load current. The DC operating points beneath each curve are in the safe operating temperature range of the MLP package.
450
400 Derating for VIN < 4.2V 350
IOUT (mA)
300
Derating for VIN < 5.5V
250
200
150 35 45 55 75 65 Ambient Temp (C) 85 95 105
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.
Maximum Continuous Output
Protection Circuitry
The SC632 also provides protection circuitry that prevents the device from operating in an unspecified state. These functions include:
Thermal Resistance
The SC632 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 overtemperature limit while operating the SC632 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.
10
SC632
Applications Information (continued)
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). 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. When selecting capacitors for an application, first consider the DC voltage characteristic of the capacitor. 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. 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 2.2 0603 Required for the full rated output current Useful for load current up to 300mA
Capacitor Selection
The SC632 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. For best ripple performance CIN and COUT are normally 22F and the bucket capacitors C1 and C2 are 2.2F. For low profile designs, two 10F capacitors may be used in place of each 22F.
CBUCKET CBUCKET
2.2
0402
NOTE: Use only X5R type capacitors, with a 6.3V rating or higher
The highest capacitance values in the smallest package sizes will 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.
11
SC632
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.
SC632
GND C2-
C2
C1
C1+ GND C1-
C2+
OUT
IN
EN
COUT CIN
EN
12
SC632
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 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
(.006) .010 .012 .079 .083 .067 .071 .079 .083 .031 .035 .020 BSC .014 .016 .012 8 .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 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
SC632
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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