SEMTECH SC632

SC632 Fixed 5.0V Output Charge Pump Regulator POWER MANAGEMENT Features Description  Input voltage range — 2.9V to 5.5V The SC632 is a high-current voltage regulator using  V tolerance — 5.0V ±3% Semtech’s proprietary low-noise charge pump technol- OUT  Continuous output current — 275mA ogy. Performance is optimized for use in single Li-Ion  Peak output current — 500mA battery cell applications. The regulator provides the per-  Three charge pump modes — x, .5x and 2x formance of a linear, low drop-out (LDO) voltage regulator  Output ripple ≤ 30mV for I ≤ 400mA when the input is greater than 5.0V. Unlike an LDO, drop- PP OUT  Short circuit, over-voltage, and over-temperature out is avoided when the input is less than 5.0V. Instead, a protection charge pump is activated to provide voltage boost and  Soft-start functionality the head-room needed for voltage regulation.  Shutdown current — 0.µA, typical Only two 2.2µF bucket capacitors are required to deliver  Ultra thin package — 2 x 2 x 0.6 (mm) the full output current. The charge pump provides a low  Lead-free and halogen-free EMI solution compared to inductive boost regulators.  WEEE and RoHS compliant Applications The SC632’s charge pump has three modes of operation: 2x, .5x, and x modes. The 2x and .5x modes deliver  Mobile phones current to the load in each of two phases. The x mode  MP3 players turns off the charge pump, delivering current through an  USB On-The-Go LDO. When active, the charge pump provides low-ripple  Multi-LED backlit LCDs operation at 200kHz, which is typically less than 30mVpp  Compact flash/CF+ products at the output. The SC632 is capable of delivering 275mA  PMPs continuous current, with peak current to 500mA. A 22µF  Digital video cameras output capacitor is used for decoupling the load and for  Digital still cameras smoothing mode transitions. Hysteresis is provided to  PDAs prevent chatter between charge pump modes. Typical Application Circuit V = 5.0V @ 275mA OUT IN OUT C C IN OUT V BAT 22µF 22µF SC632 Chip C1+ EN C 1 enable C1- 2.2µF C2+ C 2 C2- 2.2µF GND US Patent: 7,808,220 Revision 6.0 © 20 Semtech Corporation  SC632 Pin Configuration Ordering Information Device Package ()(2) SC632ULTRT MLPD-UT-8 2x2 SC632EVB Evaluation Board Notes: () Available in tape and reel only. A reel contains 3,000 devices. GND C2- 1 8 (2) Lead-free packaging only. Device is WEEE and RoHS compliant, TOP VIEW and halogen-free. C1+ 2 7 C2+ Device Options C1- 3 6 OUT T Device Features IN 5 EN 4 SC630A MHz, 3.3V, smaller C and C IN OUT SC632A MHz, 5.0V, smaller C and C IN OUT SC630 200kHz, 3,3V MLPD-UT-8; 2x2, 8 LEAD θ = 68°C/W JA Marking Information 632 yw yw = Datecode 2 SC632 Absolute Maximum Ratings Recommended Operating Conditions IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 Ambient Temperature Range (°C) . . . . . . . . -40 ≤ T ≤ +85 A OUT (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 IN (V) ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 ≤ V ≤ 5.5 IN C+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V + 0.3) OUT Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to (V + 0.3) IN Thermal Information OUT pin — Short Circuit Duration . . . . . . . . . . Continuous () (2) Thermal Resistance, Junction to Ambient (°C/W) . . . . 68 ESD Protection Level (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +50 Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +50 Peak IR Reflow Temperature (0s 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 () 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 JESD5 standards. (2) Tested according to JEDEC standard JESD22-A4-B. Electrical Characteristics Unless otherwise specified: T = +25°C for Typ, -40°C to +85°C for Min and Max; C = C = 2.2µF (ESR < 0.03Ω); C = C = 22µF; V = 2.9V to 5.5V A  2 IN OUT IN Parameter Symbol Condition Min Typ Max Units Output Voltage V V = 4.2V, I = mA 4.85 5.0 5.5 V OUT IN OUT Output Voltage Ripple V I ≤ 400mA 30 mV PP OUT () Peak Load - thermally limited , 500 mA T <50°C, 3.3V ≤ V ≤ 5.5V J IN Continuous Load, Maximum Output Current I 400 mA OUT T ≤ 55°C, 3.5V ≤ V ≤ 4.2V A IN Continuous Load, 275 mA 3.0V ≤ V ≤ 4.2V IN Shutdown Current I Shutdown (EN = GND), V = 3.6V 0. 2 µA SD IN Total Quiescent Current I EN high, I = mA .5 2.5 mA Q OUT Charge Pump Frequency f V = 3.2V 40 200 260 kHz PUMP IN (EN transitions from low to high), Start-Up Time t 400 µs SU 4.85V ≤ V ≤ 5.5V, No load OUT Line Regulation ΔV I = mA, 2.85V ≤ V ≤ 4.2V 2 mV LINE OUT IN Load Regulation ΔV V =4.2V, mA ≤ I ≤ 400mA 37.5 mV LOAD IN OUT 3 SC632 Electrical Characteristics (continued) Parameter Symbol Condition Min Typ Max Units EN Input High Threshold V V = 5.5V .6 V IH IN EN Input Low Threshold V V = 2.7V 0.4 V IL IN EN Input High Current I V = 5.5V 2 µA IH IN EN Input Low Current I V = 5.5V 2 µA IL IN x mode 0.25 Ω Open-Loop Output Resistance R .5x mode, V = 3.7V 2.85 Ω OUT IN 2x mode, V = 3.V 2.9 Ω IN V I = 200mA 5.05 V TRANS X OUT (2) Mode Transition Voltage V I = 200mA 3.7 V TRANS .5X OUT Fault Protection Short-Circuit Current I V = 0V, I = I 300 600 980 mA SC OUT OUT IN V > 2V, x mode 0.6 .2 2.0 A OUT Input Current Limit I V > 2V, .5x and 2x modes .2 2.0 2.8 A LIMIT OUT V ≤ 2V, I = I 700 mA OUT OUT IN T Rising Threshold 65 °C OTP Over Temperature (3) T Hysteresis 20 °C HYS Notes: () 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 V falling. IN (3) Guaranteed by design — not tested in production. 4 SC632 Typical Characteristics Load Regulation Line Regulation V = 5V, V = 4.2V OUT IN V = 5V, I = 1mA OUT OUT 25 25 20 TA=25°C 85°C 20 15 T =85°C A 25°C 10 15 3.6V, 0mV -40°C 5 10 0 T =-40°C A -5 5 -10 0 -15 0 90 180 270 360 450 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 — 1.5x Mode PSRR versus Frequency — 1.5x Mode V = 3.6V, V = 5V, I = 50mA IN OUT OUT V = 4.2V, V = 5V, I = 50mA IN OUT OUT 0 0 C =C =22µF (0805) C =C =22µF (0805) IN OUT IN OUT -10 -10 C =C =2.2µF (0603) C =C =2.2µF (0603)  2  2 -20 -20 -30 -30 -40 -40 -50 -50 -60 -60 -70 -70 -80 -80 -90 -90 -100 -100 10 1000 10000 100 10 100 1000 10000 Frequency (Hz) Frequency (Hz) PSRR versus Frequency — 2x Mode V = 2.9V, V = 5V, I = 50mA IN OUT OUT 0 C =C =22µF (0805) IN OUT -10 C =C =2.2µF (0603)  2 -20 -30 -40 -50 -60 -70 -80 -90 -100 10 100 10000 1000 Frequency (Hz) 5 Gain (dB) Output Voltage Variation —ΔVLOAD (mV) Gain (dB) Gain (dB) Output Voltage Variation —ΔV (mV) LINE SC632 Typical Characteristics (continued) Efficiency — 50mA Efficiency — 10mA V = 5V, I = 10mA V = 5V, I = 50mA OUT OUT OUT OUT 100 100 90 90 1.5x Mode 1.5x Mode 80 80 Mode Mode Transition Transition 2x Mode Hysteresis Hysteresis 70 70 2x Mode 60 60 50 50 4.2 3.9 3.6 3.3 3.0 2.7 3.3 4.2 3.9 3.6 3.0 2.7 Input Voltage (V) Input Voltage (V) Efficiency — 200mA Efficiency — 100mA VOUT = 5V, IOUT = 100mA V = 5V, I = 200mA OUT OUT 100 100 1.5x Mode 90 90 1.5x Mode Mode 80 80 Transition Mode Hysteresis Transition 2x Mode Hysteresis 70 70 2x Mode 60 60 50 50 4.2 3.9 3.6 3.3 3.0 2.7 4.2 2.7 3.9 3.6 3.3 3.0 Input Voltage (V) Input Voltage (V) Efficiency — 300mA Efficiency — 400mA V = 5V, I = 300mA V = 5V, I = 400mA OUT OUT OUT OUT 100 100 90 90 1.5x Mode 1.5x Mode 80 80 2x Mode 2x Mode 70 70 60 60 50 50 4.2 4.2 3.9 3.6 3.3 3.0 2.7 3.9 3.6 3.3 3.0 2.7 Input Voltage (V) Input Voltage (V) 6 Efficiency(%) Efficiency(%) Efficiency(%) Efficiency(%) Efficiency(%) Efficiency(%) SC632 Typical Characteristics (continued) Ripple — 1.5x Mode Ripple — 1x Mode V = 5.2V, V = 5.0V, I = 400mA V = 4.2V, V = 5.0V, I = 400mA IN OUT OUT IN OUT OUT V (20mV/div) IN -PP V (00mV/div) IN -PP V (20mV/div) OUT -PP V (00mV/div) OUT -PP 400mA 400mA I (200mA/div) OUT I (200mA/div) OUT C =C =22µF (0805) IN OUT C =C =22µF (0805) IN OUT C =C =2.2µF (0603) 0mA  2 0mA C =C =2.2µF (0603)  2 Time (10µs/div) Time (10µs/div) Ripple — 2x Mode Startup (No Load) V = 3.2V, V = 5.0V, I = 400mA IN OUT OUT V = 3.6V, I = 0mA IN OUT V (50mV/div) IN -PP V (2V/div)– EN 0V— V (50mV/div) OUT -PP 400mA I (200mA/div) OUT V (2V/div)– OUT C =C =22µF (0805) IN OUT 0V— C =C =2.2µF (0603)  2 C =C =22µF (0805) IN OUT 0V— C =C =2.2µF (0603) 0mA  2 I (200mA/div) OUT Time (200µs/div) Time (10µs/div) Quiescent Current Startup (400mA) V = 5V, I = mA V = 3.6V, I = 400mA OUT OUT IN OUT 2.5 85C 25C 2.0 V (2V/div)– EN 0V — 1.5 -45C V (2V/div)– OUT 0V— 1.0 C =C =22µF (0805) IN OUT 0V— C =C =2.2µF (0603)  2 I (200mA/div)– OUT 0.5 Time (200µs/div) 4.20 3.94 3.68 3.42 3.16 2.90 V (V) IN 7 I (mA) Q SC632 Pin Descriptions Pin Pin Name Pin Function  GND Ground — connect to ground plane with multiple vias 2 C+ Positive terminal of bucket capacitor  3 C- Negative terminal of bucket capacitor  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 This pad is for heat sinking and is not connected internally. It must be connected to a ground plane using T Thermal Pad multiple vias. 8 SC632 Block Diagram IN 4 LDO 2 C1+ 200kHz 3 C1- 7 C2+ Logic EN 5 8 Control C2- CHARGE PUMP 6 OUT Reference Voltage Generator 1 GND 9 SC632 Applications Information General Description Temperature Derating The SC632 is a 5.0V output charge pump regulator The V supply range and ambient temperature range of IN designed to support up to 400mA (T ≤ 55°C, 3.5V ≤ V ≤ the application should be compared with the following A IN 4.2V) and 275mA (T ≤ 85°C, 3.5V ≤ V ≤ 5.5V) of continu- derating curve to determine the maximum safe continu- A IN ous current for powering 5.0V devices in portable ous load current. The DC operating points beneath each handheld equipment including Compact Flash and CF+ curve are in the safe operating temperature range of the products. MLP package. 450 The SC632 has three operating modes — x, .5x, and 2x. The x mode is a linear series regulation mode with a low 400 open-loop output resistance of only 250mW. The x mode Derating for V < 4.2V IN functions as a low-noise series linear regulator. The .5x 350 and 2x modes are a low noise, constant frequency, con- stant duty cycle switch mode, using two bucket capacitors. 300 Derating for V < 5.5V IN One bucket supports the full output current while the other bucket charges from the input. The two buckets 250 exchange roles in the next phase, supplying continuous 200 output current in both phases and reducing the need for a large output decoupling capacitor. The constant fre- 150 quency, constant duty cycle operation also produces 45 55 75 35 65 85 95 105 Ambient Temp (°C) predictable constant frequency harmonics. Maximum Continuous Output Mode Transition Hysteresis Hysteresis is provided to prevent chatter between charge Protection Circuitry pump modes for input steps of up to 20mV. Decouple The SC632 also provides protection circuitry that pre- the input to prevent steps greater than 20mV, for vents the device from operating in an unspecified state. optimum transient performance, when the input voltage These functions include: reaches the mode transition thresholds. • Over-Current Protection (OCP) Thermal Resistance • Short-Circuit Current Protection (SCCP) The SC632 package is thermally efficient when the circuit • Over-Temperature Protection (OTP) board layout connects the thermal pad through multiple vias to the ground plane. The thermal resistance rating is Over-Current Protection dependent upon the connection between the thermal Over-current protection is provided to limit the output pad and the ground plane. A layout that is done correctly current. When V is greater than 2V, OCP limits the OUT should keep the junction temperature below the over- output to A typical. The threshold at 2V allows the temperature limit while operating the SC632 within the device to recover from excessive voltage droop during an specified electrical conditions. A poor layout may allow over current. 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. 0 I (mA) OUT SC632 Applications Information (continued) Short-Circuit Current Protection When selecting capacitors for an application, first consider Short-circuit current protection is provided to limit the the DC voltage characteristic of the capacitor. The value current that can be sourced when the output is shorted to of capacitance at the DC operating voltage may be con- ground. When a short circuit forces V to drop below 2V, siderably lower than the rated value. The following table OUT the SCCP detects the condition and limits the output lists recommended capacitor values which have been current to 600mA (typical). chosen to minimize the impact of this limitation. Over-Temperature Protection Table 1 — Recommended Capacitors The over-temperature circuit helps prevent the device Value Case from overheating and experiencing a catastrophic failure. Capacitor Notes μF Size When the junction temperature exceeds 65°C, the device is disabled. It remains disabled until the junction tempera- Typical output V ≤ 20mV in all PP charge pump modes ture drops below this threshold. Hysteresis is included C , C 22 0805 IN OUT that prevents the device from re-enabling until the junc- Typical input ripple ≤ 00mV in all tion temperature is reduced by 20°C. charge pump modes Required for the full rated output C 2.2 0603 Capacitor Selection BUCKET current The SC632 is designed to use low-ESR ceramic capacitors Useful for load current up to for the input and output bypass capacitors as well as the C 2.2 0402 BUCKET 300mA charge pump bucket capacitors. Ideal performance is achieved when the bucket capacitors are exactly equal. NOTE: Use only X5R type capacitors, with a 6.3V rating or higher The value of input and output decoupling capacitors will vary with system requirements. For best ripple perfor- The highest capacitance values in the smallest package mance C and C are normally 22µF and the bucket IN OUT sizes will tend to have poor DC voltage characteristics. capacitors C and C are 2.2µF. For low profile designs, two  2 The highest value 0402 size capacitor retains as little as 0µF capacitors may be used in place of each 22µF. 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.  SC632 Applications Information (continued) 2. Place the input and output decoupling capacitors PCB Layout Considerations as close as possible to the device and connect these Poor layout can degrade the performance of the regula- capacitors’ ground pads together to the ground plane tor and can be a contributory factor in EMI problems, using multiple vias through a short wide copper ground bounce, thermal issues, and resistive voltage area. losses. Poor regulation and instability can result. 3. Connect pin  directly to the copper area under the The following design rules are recommended: thermal pad. 4. The thermal pad at the center of the device is not . Place the bucket capacitors as close to the device as electrically connected. Connect this pad to the possible and on the same side of the board. Use short ground plane using multiple vias. wide copper areas between the capacitor pins and 5. Use a ground plane to further reduce noise the device pins. interference on sensitive circuit nodes. SC632 C 2 C2- GND C2+ C1+ C 1 GND C1- OUT EN IN C OUT C IN EN 2 SC632 Outline Drawing — MLPD-UT-8 2x2 B A D DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX - - E A .020 .024 0.50 0.60 PIN 1 - - A1 .000 .002 0.00 0.05 INDICATOR (.006) (0.1524) A2 (LASER MARK) b .007 .010 .012 0.18 0.25 0.30 D .075 .079 .083 1.90 2.00 2.10 D1 .061 .067 .071 1.55 1.70 1.80 E .075 .079 .083 1.90 2.00 2.10 E1 .026 .031 .035 0.65 0.80 0.90 e .020 BSC 0.50 BSC A SEATING L .012 .014 .016 0.30 0.35 0.40 PLANE aaa C 8 8 N aaa .003 0.08 A2 A1 C bbb .004 0.10 D1 1 2 LxN E/2 E1 N bxN bbb C A B e 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. 3 SC632 Land Pattern — MLPD-UT-8 2x2 H DIMENSIONS R DIM INCHES MILLIMETERS (.077) (1.95) C G .047 1.20 H .067 1.70 Z (C) K G K .031 0.80 .020 0.50 P R .006 0.15 Y X .012 0.30 Y .030 0.75 Z .106 2.70 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. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD 3. SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE. 4 SC632 © Semtech 20 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. 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