SEMTECH SC632A

SC632A 1MHz Fixed 5.0V Output Charge Pump Regulator POWER MANAGEMENT Features Description The SC632A is a high-current voltage regulator using  Input voltage range — 2.95V to 5.5V Semtech’s proprietary low-noise charge pump technol-  V tolerance — 5.0V ±3% OUT ogy. The charge pump provides a low EMI solution  Continuous output current — 275mA compared to inductive boost regulators. Performance is  Peak output current — 400mA optimized for use in single Li-Ion battery cell applications.  Three charge pump modes — x, .5x and 2x The regulator provides the performance of a linear, low  Output ripple voltage — 50mV , typical PP drop-out (LDO) voltage regulator when the input is greater  Short circuit, over-voltage, and over-temperature than 5.0V. Unlike an LDO, drop-out is avoided when the protection input is less than 5.0V. Instead, a charge pump is activated  Soft-start functionality to provide voltage boost and the head-room needed for  Shutdown current — 0.µA, typical voltage regulation.  Ultra thin package — 2 x 2 x 0.6 (mm)  Lead-free and halogen-free The SC632A’s charge pump has three modes of operation:  WEEE and RoHS compliant 2x, .5x, and x modes. 2x and .5x are voltage boost modes that deliver current to the load in each of two Applications phases. The x mode turns off the charge pump, deliver- ing current through an LDO. Hysteresis is provided to  Mobile phones prevent chatter between charge pump modes. When  Tablets active, the charge pump provides low-ripple operation at  USB On-The-Go MHz. Typically the output ripple is 50mVpp at the  Multi-LED backlit LCDs maximum continuous current rating of 275mA.  Compact flash/CF+ products  Digital video cameras A small 2.2µF capacitor is recommended for all four capaci- tors. The full rated output current is provided when 2.2µF  DVI/HDMI ports is used for both bucket capacitors. At the output, a 2.2µF  Wi-Fi base stations capacitor decouples the load and provides smoothing for  Modems mode transitions, while another 2.2µF is used to decouple  Set-top boxes the input. Typical Application Circuit V = 5.0V @ 275mA OUT IN OUT C C IN OUT V BAT 2.2µF 2.2µF SC632A Chip C1+ EN C 1 enable C1- 2.2µF C2+ C 2 C2- GND 2.2µF US Patent: 7,808,220 Revision .0 © 20 Semtech Corporation  SC632A Pin Configuration Ordering Information Device Package ()(2) SC632AULTRT MLPD-UT-8 2x2 SC632AEVB 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+ C1- 3 6 OUT T IN 5 EN 4 MLPD-UT-8; 2x2, 8 LEAD θ = 68°C/W JA Marking Information K2A yw Yw = Datecode 2 SC632A 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) ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.95 ≤ 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 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 = C = C = 2.2µF (ESR < 0.03Ω); V = 2.95V to 5.5V A IN OUT  2 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 = 275mA 50 mV PP OUT () Peak Load - thermally limited , 400 mA T <50°C, 3.4V ≤ V ≤ 5.5V J IN Maximum Output Current I OUT 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 2.5 3.5 mA Q OUT Charge Pump Frequency f V = 3.2V  MHz 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, 2.95V ≤ V ≤ 4.2V 2 mV LINE OUT IN Load Regulation ΔV V =4.2V, mA ≤ I ≤ 400mA 37.5 mV LOAD IN OUT 3 SC632A 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 = 2.95V 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 3.5 Ω OUT IN 2x mode, V = 3.V 4.5 Ω IN V I = 200mA 5.05 V TRANS X OUT (2) Mode Transition Voltage V I = 200mA 3.8 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 SC632A Typical Characteristics Load Regulation Line Regulation V V = 5.0V = 5.0V, , V V = 4.2V = 4.2V V = 5.0V, I = mA OUT OUT IN IN OUT OUT 25 25 20 85°C 20 T =25°C A 15 25°C 10 15 3.6V, 0mV T =-40°C A -40°C TA=85°C 5 10 0 -5 5 -10 -15 0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 0 80 160 240 320 400 Output Current (mA) Input Voltage (V) PSRR versus Frequency — 1x Mode Output Ripple V = 5.25V, V = 5V, I = 50mA; C = C = C = C = 2.2uF (0603) V = 5V; C = C = C = C = 2.2uF (0603) IN OUT OUT IN OUT  2 OUT IN OUT  2 120 0 -10 100 400mA -20 -30 80 300mA -40 1.5x and 2x mode 200mA 60 -50 -60 40 100mA -70 50mA -80 20 10mA -90 1x mode 0 -100 10 100 1000 10000 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 Frequency (Hz) Input Voltage (V) PSRR versus Frequency — 2x Mode PSRR versus Frequency — 1.5x Mode V = 4.2V, V = 5V, I = 50mA; C = C = C = C = 2.2uF (0603) V = 2.9V, V = 5V, I = 50mA; C = C = C = C = 2.2uF (0603) IN OUT OUT IN OUT  2 IN OUT OUT IN OUT  2 0 0 -10 -10 -20 -20 -30 -30 -40 -40 -50 -50 -60 -60 -70 -70 -80 -80 -90 -90 -100 -100 10 100 1000 10000 10 100 1000 10000 Frequency (Hz) Frequency (Hz) 5 Gain (dB) Gain (dB) Output Voltage Variation —ΔVLOAD (mV) Gain (dB) Output Voltage Variation —ΔV (mV) Ripple (mV p-p) LINE SC632A Typical Characteristics (continued) Efficiency — 50mA Efficiency — 10mA V = 5.0V, I = 0mA, T = 25°C V = 5.0V, I = 50mA, T = 25°C OUT OUT A OUT OUT A 100 100 1x Mode Mode Transition 90 90 Hysteresis 1x Mode Mode Transition 2x Mode 1x Mode Hysteresis 80 80 Mode 1.5x Mode 2x Mode Transition Hysteresis Mode 1x Mode Transition 70 70 1.5x Mode Hysteresis 1.5x Mode 2x Mode 60 60 2x Mode 1.5x Mode 50 50 40 40 30 30 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 Efficiency — 100mA V = 5.0V, I = 00mA, T = 25°C V = 5.0V, I = 200mA, T = 25°C OUT OUT A OUT OUT A 100 100 1x Mode 1x Mode Mode Mode Transition Transition 90 Hysteresis 90 Hysteresis 1x Mode 1x Mode 2x Mode 80 80 2x Mode Mode 1.5x Mode 1.5x Mode Transition Mode Hysteresis Transition 70 70 Hysteresis 1.5x Mode 2x Mode 1.5x Mode 60 60 2x Mode 50 50 40 40 30 30 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 — 300mA Efficiency — 400mA V = 5.0V, I = 300mA, T = 25°C V = 5.0V, I = 400mA, T = 25°C OUT OUT A OUT OUT A 100 100 1x Mode 1x Mode Mode Mode Transition Transition 90 90 Hysteresis Hysteresis 1x 1.5x Mode Mode 80 80 1.5x Mode 2x Mode 2x Mode Mode 70 70 Transition Hysteresis Mode Transition Hysteresis 2x Mode 60 60 1.5x Mode 1x Mode 2x Mode 50 50 1.5x Mode 40 40 30 30 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 Efficiency(%) Efficiency(%) Efficiency(%) Efficiency(%) Efficiency(%) Efficiency(%) SC632A Typical Characteristics (continued) Ripple — 1.5x Mode Ripple — 1x Mode V = 4.2V, V = 5.0V, I = 275mA; C = C = C = C = 2.2uF (0603) V = 5.2V, V = 5.0V, I = 275mA; C = C = C = C = 2.2uF (0603) IN OUT OUT IN OUT  2 IN OUT OUT IN OUT  2 V (00mV/div) IN -PP V (00mV/div) IN -PP V (00mV/div) OUT -PP V (00mV/div) OUT -PP 275mA 275mA I (200mA/div) I (200mA/div) OUT OUT 0mA 0mA Time (400ns/div) Time (400ns/div) Ripple — 2x Mode Startup (No Load) V = 3.2V, V = 5.0V, I = 275mA; C = C = C = C = 2.2uF (0603) V = 3.6V, I = 0mA; C = C = C = C = 2.2uF (0603) IN OUT OUT IN OUT  2 IN OUT IN OUT  2 V (2V/div)– EN V (00mV/div) IN -PP 0V— V (00mV/div) OUT -PP V (2V/div)– OUT 0V— 275mA I (200mA/div) OUT 0V— 0mA I (200mA/div) OUT Time (200µs/div) Time (400ns/div) Quiescent Current Startup (400mA) V = 5V, I = mA V = 3.6V, I = 400mA; C = C = C = C = 2.2uF (0603) OUT OUT IN OUT IN OUT  2 4 3.5 V (2V/div)– EN 0V — 2x Mode 1.5x Mode 3 2x Mode 2.5 V (2V/div)– OUT 1x Mode 1.5x Mode 0V— 2 1x Mode 0V— – 1.5 I (200mA/div) OUT 1 Time (200µs/div) 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 Input Voltage (V) 7 I (mA) Q SC632A 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 SC632A Block Diagram IN 4 LDO 2 C1+ 1MHz 3 C1- 7 C2+ Logic EN 5 8 Control C2- CHARGE PUMP 6 OUT Reference Voltage Generator 1 GND 9 SC632A Applications Information General Description Temperature Derating The SC632A is a 5.0V output charge pump regulator The V supply range and ambient temperature range of IN designed to support up to 300mA (T ≤ 80°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 SC632A has three operating modes — x, .5x, and 2x. The x mode is a linear series regulation mode with a 400 low open-loop output resistance of only 250mW. The x Derating for V < 4.2V IN mode functions as a low-noise series linear regulator. The 350 .5x and 2x modes are a low noise, constant frequency, constant duty cycle switch mode, using two bucket 300 capacitors. One bucket supports the full output current Derating for V < 5.5V IN while the other bucket charges from the input. The two 250 buckets exchange roles in the next phase, supplying con- tinuous output current in both phases and reducing the 200 need for a large output decoupling capacitor. The constant 150 frequency, constant duty cycle operation also produces 35 45 55 65 75 85 95 105 predictable constant frequency harmonics. Ambient Temp (°C) 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 SC632A 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 SC632A 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 SC632A 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 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 Size Code Value ground. When a short circuit forces V to drop below 2V, OUT Capacitor Notes mil(mm) μF the SCCP detects the condition and limits the output current to 600mA (typical). This capacitor is required for Over-Temperature Protection C , C IN OUT the full rated output current. The over-temperature circuit helps prevent the device 0603(608) 2.2 Typical output V < 00mV PP from overheating and experiencing a catastrophic failure. C C in all charge pump modes. , 2 When the junction temperature exceeds 65°C, the device This capacitor combina- is disabled. It remains disabled until the junction tempera- C , C IN OUT tion supports up to 200mA ture drops below this threshold. Hysteresis is included 0402(005) 2.2 output current with typical that prevents the device from re-enabling until the junc- output V < 00mV in all PP C C tion temperature is reduced by 20°C. , 2 charge pump modes. This capacitor combina- Capacitor Selection C , C IN OUT tion supports up to 00mA The SC632A is designed to use low-ESR ceramic capacitors 0402(005) 0.47 output current with typical for the input and output bypass capacitors as well as the output V < 00mV in all PP C C , 2 charge pump modes. charge pump bucket capacitors. The value of input, output and decoupling capacitors will vary with system require- This combination of capaci- .0 C , C IN OUT ments for ripple and output current. Performance as tors support up to 00mA output current with typical shown in the Typical Characteristic section is expected output V < 00mV in all PP when using 2.2µF capacitors in the 0603(608 metric) case charge pump modes. size with X5R dieletric for C , C , C and C capacitors IN OUT  2 (refer to Table ). 0402(005) The 0.µF bucket capaci- tors will increase output 0. C C , 2 Consider the DC voltage characteristic of the capacitor resistance by 2.5Ω compared to 0.47µF and larger values. when choosing capacitors for an application. The value of So, at 00mA output the .5x capacitance at the DC operating voltage may be consider- to 2x mode transition will be ably lower than the rated value. The following table lists 200mV higher. recommended capacitor values which have been chosen to minimize the impact of this limitation. 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, will retain about 60% of its rated value at 5VDC.  SC632A 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. SC632A C 2 C2- GND C2+ C C1+ 1 GND C1- OUT EN IN C OUT C IN EN 2 SC632A 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 SC632A 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 SC632A © 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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