SC560 Dual Output Low Noise LDO Linear Regulator POWER MANAGEMENT Features Description The SC560 is a family of dual output, ultra-low dropout linear voltage regulators designed for use in battery powered wireless applications. The SC560A, SC560B, and SC560C provide adjustable output voltages that can be set using two external resistors. Fixed output voltages are also available (see ordering information for available combinations). Fixed output devices provide the powergood monitor, independent enable pins, and a bypass pin for low-noise operation Input voltage range — 2.5V to 5.5V Output voltage ranges — 1.2V to 5.0V (each LDO) Maximum output current — 300mA (both LDOs) Dropout at 200mA load — 200mV max. Quiescent supply current — 100μA (both LDOs enabled) Shutdown current — 100nA (typ) Output noise < 50μVRMS (SC560A and fixed output versions) PSRR < -65dB at 1kHz (SC560A and fixed output versions) Over-temperature protection Short-circuit protection Under-voltage lockout Power good monitor for output A (SC560C and fixed output versions) Independent enable/disable for LDOB (SC560B and fixed output versions) MLPQ-UT8, 1.5mm x 1.5mm x 0.6mm package Applications PDAs and cellular phones GPS devices Palmtop computers and handheld instruments TFT/LCD applications Wireless handsets Digital cordless phones and PCS phones Personal communicators Wireless LAN All members of the SC560 family require an input voltage level between 2.5V and 5.5V. Output voltages for the adjustable versions can vary between 1.2V and 5.0V. Fixed output voltage options are also chosen from this range. The SC560A provides superior low-noise performance by using an external bypass capacitor connected to pin 7 to filter the bandgap reference. The SC560B uses pin 7 as a separate enable pin for the second regulator output so the two outputs can be controlled independently. The SC560C uses this pin to provide a PGOOD output to hold a processor in reset when the voltage on OUTA is not in regulation. All other versions provide all three functions with fixed output voltages (no feedback pins are provided). The device also provides protection circuitry such as current limiting, under-voltage lockout, and thermal protection to prevent device failures. Stability is maintained by using 1μF capacitors on the output pins. The MLPQ-UT8 package and 0402 ceramic capacitors minimize the required PCB area. Typical Application Circuit SC560D VIN VIN EN EN OUTA ENB OUTB ENB CIN 2.2μF March 28, 2008 PGOOD PGOOD GND BYP OUTA OUTB CBYP 22nF © 2008 Semtech Corporation COUTA 1μF COUTB 1μF 1 SC560 Pin Configuration Ordering Information Device Package SC560xULTRT(1)(2)(3) MLPQ-UT8 1.5×1.5 SC560xEVB(3) Evaluation Board 8 1 7 TOP VIEW 6 2 Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Available in lead-free package only. Device is WEEE and RoHS compliant. (3) The device variant is denoted by the x. 5 3 4 MLPQ-UT-8; 1.5x1.5, 8 LEAD θJA = 157°C/W Marking Information Pinout and Voltage Options Output Voltage Options Pin Options Device 0n yw Part No. Code Pin 4 Pin7 Pin 8 VLDOA VLDOB SC560A FBA BYP FBB ADJ ADJ 0A SC560B FBA ENB FBB ADJ ADJ 0B SC560C FBA PGOOD FBB ADJ ADJ 0C SC560D ENB BYP PGOOD 2.8V 1.8V 0D SC560E ENB BYP PGOOD 2.85V 2.85V 0K SC560F ENB BYP PGOOD 2.5V 1.8V 0L SC560G ENB BYP PGOOD 2.8V 1.5V 0U SC560H ENB BYP PGOOD 3.3V 3.3V 0S 0n = Part No. Code See Pinout and Voltage Options Table for details yw = Datecode 2 SC560 Absolute Maximum Ratings Recommended Operating Conditions VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.5 Ambient Temperature Range (°C) . . . . . . . . . -40 < TA < +85 EN, ENB (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3) VIN (V) .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 < VIN < 5.5 PGOOD (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3) VOUTA, VOUTB (V) .... . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 < VOUT < 5.0 Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to (VIN + 0.3) OUTA, OUTB Short Circuit Duration . . . . . . . . Continuous ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Thermal Information Thermal Resistance, Junction to Ambient(2) (°C/W) . . . 157 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”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. Electrical Characteristics Unless otherwise noted VIN = 3.6V, CIN = 2.2μF, COUTA = COUTB = 1μF, VEN = VENB = VIN, TA = -40 to +85°C. Typical values are at TA = 25°C. All specifications apply to both LDOs unless otherwise noted. Parameter Input Supply Voltage Range Output Voltage Symbol Conditions Min Typ Max Units VIN 2.5 5.5 V VOUTx 1.2 5.0 V -3 3 % Output Voltage Accuracy ΔVOUTx VIN = 2.5V to 5.5V, IOUTx = 0 to 300mA Maximum Output Current IMAX Dropout Voltage(1) VD IOUTx = 200mA, VOUTx = 2.5V to 5.0V 100 200 mV Shutdown Current ISD TA = 25°C 0.1 1 μA Quiescent Current IQ IOUTA = IOUTB = 0mA, TA = 25°C 100 Load Regulation ΔVLOAD IOUTx = 1mA to IMAX Line Regulation ΔVLINE IOUTx = 1mA 300 mA -6 Feedback Regulation Voltage(2) VFB 0.985 Current Limit ILIM 350 1 μA 20 mV 6 mV 1.015 V 850 mA 3 SC560 Electrical Characteristics (continued) Parameter (3) Noise Power Supply Rejection Ratio (3) PGOOD Delay(4) Symbol eN Conditions Min Typ Max Units VIN = 3.7V, IOUTx = 50mA , 10Hz < f < 100kHz, CBYP = 22nF 50 μVRMS VIN = 3.7V, IOUTx = 50mA , 10Hz < f < 100kHz 300 μVRMS VIN = 3.7V, IOUTx = 50mA, f = 1kHz, CBYP = 22nF 65 dB VIN = 3.7V, IOUTx = 50mA, f = 1kHz 40 PSRR tDELAY 160 200 240 ms 82 87 92 % V TH-PGOOD Percentage of nominal output, VOUTA falling tSU From OFF to 87% VOUTx, IOUTx = 50mA, CBYP = 22nF(2) 1 ms Power Up Delay Between LDOA and LDOB(5) tDELAY Delay between VOUTA and VOUTB start-ups 128 μs Under Voltage Lockout VUVLO VIN Rising PGOOD Threshold(4) Start-Up Time UVLO Hysteresis 2.15 VUVLO-HYS Over Temperature Protection Threshold TOT Over Temperature Hysteresis TOT-HYS Temperature Rising 2.25 2.35 V 100 mV 160 °C 20 °C Digital Inputs Logic Input High Threshold VIH VIN = 5.5V Logic Input Low Threshold VIL VIN = 2.5V 0.4 V Logic Input High Current IIH VIN = 5.5V 1 μA Logic Input Low Current IIL VIN = 5.5V 1 μA VOL ISINK = 500μA,VIN=3.7V 20 mV 1.25 V Digital Outputs PGOOD Output voltage Low 7 Notes: (1) Dropout voltage is defined as VIN - VOUTx , when VOUTx is 100mV below the value of VOUTx at VIN = VOUTx + 0.5V. (2) SC560A, SC560B and SC560C only (3) Except SC560B and fixed output versions (4) Except SC560A and SC560B (5) SC560A and SC560C only 4 SC560 Typical Characteristics Load Regulation — LDOA Load Regulation — LDOB VOUTA = 3.3V, VIN = 3.6V 6 7 Output Voltage Variation (mV) 5 Output Voltage Variation (mV) VOUTB = 2.8V, VIN = 3.6V 8 4 TA=85°C 3 TA=25°C 2 TA=-40°C 6 5 TA=85°C TA=-40°C 4 3 TA=25°C 2 1 1 0 0 0 50 100 150 200 250 0 50 100 Line Regulation — LDOA 2 150 200 250 Output Current (mA) Output Current (mA) Line Regulation — LDOB VOUTA = 3.3V, IOUTA = 1mA VOUTB = 2.8V, IOUTB = 1mA 3 Output Voltage Variation (mV) Output Voltage Variation (mV) 2.5 1.5 1 0.5 TA=85°C TA=25°C 0 2 1.5 1 TA=85°C TA=-40°C 0.5 TA=25°C 0 TA=-40°C -0.5 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 -0.5 2.9 3.1 3.3 3.5 3.7 3.9 Dropout Voltage LDOA 300 4.1 4.3 4.5 4.7 4.9 5.1 5.3 3 3.05 5.5 Input Voltage (V) Input Voltage (V) Dropout Voltage LDOB VOUTA = 3.3V, IOUTA = 200mA 400 VOUTB = 2.8V, IOUTB = 200mA 350 250 150 VIN - VOUT (mV) VIN - VOUT (mV) 300 200 TA=85°C 100 250 200 TA=85°C 150 100 TA=25°C 50 0 2.95 3 3.05 3.1 3.15 3.2 3.25 TA=25°C TA=-40°C 3.3 3.35 Input Voltage (V) 3.4 TA=-40°C 50 3.45 3.5 3.55 3.6 0 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.1 Input Voltage (V) 5 SC560 Typical Characteristics (continued) PSRR vs. Frequency (Both LDOs) 0 PSRR vs. Frequency (Both LDOs) VOUT = 2.8V, Io=50mA, CBYP=22nF VOUT = 2.8V, IO = 50mA 0 -10 -10 -20 -20 PSRR (dB) PSRR (dB) -30 -40 -50 -30 -40 -60 -50 -70 -60 -80 -90 10 100 Frequency (Hz) 1000 -70 10 10000 450 VOUT = 2.8V, VIN = 3.7V, no CBYP 400 50 Output Voltage Noise (μV) T=85°C 60 T=25°C 40 T=-40°C 30 10000 Output Noise vs. Load Current (Both LDOs) VOUT = 2.8V, VIN=3.7V, CBYP=22nF 70 Output Voltage Noise (μV) 1000 Frequency (Hz) Output Noise vs. Load Current (Both LDOs) 80 100 20 10 TA=85°C 350 TA=25°C 300 TA=-40°C 250 200 150 100 50 0 0 0 50 100 150 200 250 0 50 100 150 200 250 Output Current (mA) Output Current (mA) Load Transient Response Rising Edge (Both LDOs) Load Transient Response Falling Edge (Both LDOs) VIN = 3.6V, VOUT = 2.8V VIN = 3.6V, VOUT = 2.8V IOUT=10mA to 200ma (100mA/div) IOUT=10mA to 200ma (100mA/div)) VOUT (10mV/div) VOUT (10mV/div) 6 SC560 Pin Configurations and Descriptions Pin # Pin Name SC560A SC560B SC560C SC560 Fixed Output 1 1 1 1 OUTB 2 2 2 2 VIN 3 3 3 3 OUTA 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 Pin Function Output for LDOB Input supply voltage terminal Output for LDOA FBA Feedback sense pin for LDOA — Connect this pin to an external resistor divider to set VOUTA 5 GND Analog and digital ground 6 EN Logic input — active HIGH enables both LDOs for the SC560A and SC560C, or LDOA for all other variants. 7 BYP LDO bypass output — Bypass with a 22nF capacitor 4 ENB Logic input — active HIGH enables LDOB for SC560B and SC560D 8 PGOOD Power Good output — monitors the level of LDOA, switches low when the output drops out of regulation. FBB Feedback sense pin for LDOB — Connect this pin to an external resistor divider to set VOUTB 7 SC560 Block Diagrams SC560A VIN 2 VIN VREF 7 BYP 3 OUTA 4 FBA 1 OUTB 8 FBB 3 OUTA 4 FBA 1 OUTB 8 FBB UVLO VIN GND EN 5 O/T VIN PowerON Logic 6 LDOA LDOB SC560B VIN 2 VIN VREF UVLO VIN GND EN ENB 5 6 7 O/T PowerON Logic LDOA VIN LDOB 8 SC560 Block Diagrams (continued) SC560C VIN 2 VIN 7 PGOOD 3 OUTA 4 FBA 1 OUTB 8 FBB 7 BYP 8 PGOOD LDOA 3 OUTA LDOB 1 OUTB VREF PGOOD Logic UVLO VIN GND EN 5 O/T VIN PowerON Logic 6 LDOA LDOB SC560 – Fixed Output Versions VIN 2 VIN VREF PGOOD Logic UVLO VIN GND 5 EN 6 ENB 4 O/T PowerON Logic VIN 9 SC560 Applications Information General Description The SC560 is a family of dual output linear regulator devices intended for applications where low dropout voltage, low supply current, and low output noise are critical. Each device provides a very simple, low cost solution for two separate regulated outputs. Very little PCB area is required due to the miniature package size and the need for only four external capacitors. The linear regulators LDOA and LDOB are powered from a single input supply rail, and each provides 300mA of output current. The SC560 can provide output voltages in the range 1.2V to 5.0V. The output voltages for the SC560A, SC560B and SC560C are set by connecting external resistor dividers to the feedback pins of each LDO. All other versions of the SC560 have fixed output voltage values shown in the Pinout and Voltage Options table. The SC560B and the fixed output variants provide a separate enable pin for LDOB which allows LDOA and LDOB to be enabled independently. The EN pin controls the LDOA output and the ENB provides the same functionality relative to the LDOB output. The table shown below lists the effect of the polarity of the EN and ENB signals on the outputs of LDOA and LDOB. Since LDOB can be enabled separately, there is no timing relationship between the two outputs at startup. EN ENB LDOA LDOB Low Low Off Off Low High Off Off High Low On Off High High On On Power On Control The SC560A and SC560C devices have a single enable pin (EN) that controls both LDO outputs. Pulling this pin low causes the device to enter a low power shutdown mode where it typically draws 100nA from the input supply. When EN transitions high, the output of LDOA is enabled. After a delay of 128μs, the output of LDOB is enabled. In the SC560C, when the output voltage of LDOA reaches 87% of its regulation point, the delay timer starts and the PGOOD signal transitions high after a delay of 200ms. The power up/down sequence is shown in the timing diagram in Figure 1. The SC560C and the fixed output variants have a PGOOD signal which monitors the output of LDOA and transitions high 200ms after LDOA has reached 87% of its regulation point. This can be used to hold a processor in reset when the output voltage is out of regulation. Output Voltage Selection The output voltage of each LDO for the SC560A, SC560B, and SC560C version is set independently using external resistor dividers. Figure 2 illustrates the proper connection for LDOA. OUTA EN 87% OUTA 87% 200ms FBA R1 R2 PGOOD 128 μs OUTB Figure 1 — Timing Diagram Figure 2 — Output Voltage Feedback Circuit 10 SC560 Applications Information (continued) The values of the resistors in the voltage divider network can be calculated using the equation: VOUT VREF R1 R2 R2 where VREF = 1V. The value of R2 should be 100kΩ or less to ensure noise performance and stability. Values significantly less than 100kΩ will impact the quiescent current. Protection Features The SC560 family provides the following protection features to ensure that no damage is incurred in the event of a fault condition: Under-Voltage Lockout Over-Temperature Protection Short-Circuit Protection • • • Under-Voltage Lockout The Under-Voltage Lockout (UVLO) circuit protects the device from operating in an unknown state if the input voltage supply is too low. Short-Circuit Protection Each output has short-circuit protection. If the output current exceeds the current limit, the output voltage will drop and the output current will be limited until the load current returns to a specified level. If a short-circuit occurs on the output of LDOA, the output of LDOB will also be disabled until the fault is removed and the load current returns to a specified level. Component Selection A capacitance of 1μF or larger on each output is recommended to ensure stability. Ceramic capacitors of type X5R or X7R should be used because of their low ESR and stable temperature coefficients. It is also recommended that the input be bypassed with a 2.2μF, low ESR X5R or X7R capacitor to minimize noise and improve transient response. Note: Tantalum and Y5V capacitors are not recommended. The BYP pin on the SC560D and the fixed output versions must have a minimum of 22nF connected to ground to meet all noise-sensitive requirements. Increasing the capacitance to 100nF will further improve PSRR and output noise. When the VIN drops below the UVLO threshold, the LDOs are disabled and PGOOD is held low (SC560C and fixed output variants only). When VIN is increased above the hysteresis level, the LDOs are re-enabled into their previous states, provided EN has remained high. When powering up with VIN below the UVLO threshold, the LDOs remain disabled and PGOOD is held low (SC560C and fixed output variants only). Over-Temperature Protection An internal Over-Temperature (OT) protection circuit is provided that monitors the internal junction temperature. When the temperature exceeds the OT threshold as defined in the Electrical Characteristics section, the OT protection disables both LDO outputs and holds the PGOOD signal low. When the junction temperature drops below the hysteresis level, the LDOs are re-enabled into their previous states and PGOOD transitions high after a 200ms delay, provided EN has remained high (SC560C and fixed output variants only). 11 SC560 Applications Information (continued) Thermal Considerations Although each of the two LDOs in the SC560 can provide 300mA of output current, the maximum power dissipation in the device is restricted by the miniature package size. The graphs in Figure 3 and Figure 4 can be used as a guideline to determine whether the input voltage, output voltages, output currents, and ambient temperature of the system result in power dissipation within the operating limits are met or if further thermal relief is required. 0.6 TJ = TA +(PD x θJA) where TJ = Junction Temperature (°C) TA = Ambient Temperature (°C) PD = Power Dissipation (W) θJA = Thermal Resistance Junction to Ambient (°C/W) 0.5 0.4 Maximum Recommended Input Voltage Maximum Total Output Current (A) 0.7 The following procedure can be followed to determine if the thermal design of the system is adequate. The junction temperature of the SC560 can be determined in known operating conditions using the following equation: Vo=3.3V Vo=1.5V 0.3 0.2 0.1 ______ TA=+25°C, PD(MAX)= 0.8W - - - - TA=+85°C, PD(MAX)= 0.41W 0 2.5 3 3.5 4.5 4 Input Voltage (V) 5 5.5 Example An SC560D is used to provide outputs of 2.8V, 150mA from LDOA and 1.8V, 200mA from LDOB. The input voltage is 4.2V, and the ambient temperature of the system is 40°C. PD= 0.15(4.2 – 2.8) + 0.2(4.2 – 1.8) = 0.69W 6 and Figure 3 — Safe Operating Limit TJ = 40 + (0.69 x 157) = 148.3°C 1.6 Figures 3 and 4 show that the junction temperature would be within the maximum specification of 150°C for this power dissipation. This means that operation of the SC560 under these conditions is within the specified limits and the device would not require further thermal relief measures. Maximum Power Dissipation (W) 1.4 1.2 1 TJ(Max)=150°C 0.8 0.6 TJ(Max)=125°C 0.4 0.2 0 -40 -20 0 60 20 40 Ambient Temperature (oC) 80 100 Figure 4 — Maximum PD vs. TA 12 SC560 Applications Information (continued) Layout Considerations • While layout for linear devices is generally not as critical as for a switching application, careful attention to detail will ensure reliable operation. The diagram below illustrates proper layout of a circuit using the SC560A. • • • Connect all ground connections directly to the ground plane whenever possible to minimize ground potential differences on the PCB. Ensure that the feedback resistors are placed as close as possible to the feedback pins. Attach the part to a large copper footprint, to enable better heat transfer from the device on PCBs where there are internal power and ground planes. Place the input, output, and bypass capacitors close to the device for optimal transient response and device behavior. R4 C3 R3 1 C1 C2 U1 C4 R1 R2 U1 = SC560A 13 SC560 Outline Drawing — MLPQ-UT8 D A B PIN 1 INDICATOR (LASER MARK) DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX .018 .024 0.45 0.60 A .002 0.00 0.05 A1 .000 (.006) (0.1524) A2 b .006 .008 .010 0.15 0.20 0.25 .059 BSC 1.50 BSC D .059 BSC 1.50 BSC E e .016 BSC 0.40 BSC 0.12 .014 0.16 0.30 0.35 0.40 L 8 8 N aaa .004 0.10 .004 0.10 bbb E A2 A SEATING PLANE aaa C C A1 LxN e 2 0.20 0.25 1 N bxN 0.17 bbb C A B NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 14 SC560 Land Pattern — MLPQ-UT8 Z DIMENSIONS G P 2X (C) (G) INCHES MILLIMETERS C (.057) (1.45) G .028 0.70 P .016 0.40 R .004 0.10 X .008 0.20 Y .030 0.75 Z .087 2.20 (Z) X R DIM Y 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. 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 15