SEMTECH SC560

SC560 Dual Output Low Noise LDO Linear Regulator POWER MANAGEMENT Features Description „ Input voltage range — 2.5V to 5.5V The SC560 is a family of dual output, ultra-low dropout „ Output voltage ranges — 1.2V to 5.0V (each LDO) linear voltage regulators designed for use in battery „ Maximum output current — 300mA (both LDOs) powered wireless applications. The SC560A, SC560B, and „ Dropout at 200mA load — 200mV max. SC560C provide adjustable output voltages that can be „ Quiescent supply current — 100μA (both LDOs set using two external resistors. Fixed output voltages enabled) are also available (see ordering information for available „ Shutdown current — 100nA (typ) combinations). Fixed output devices provide the power- „ Output noise < 50μV (SC560A and fi xed output good monitor, independent enable pins, and a bypass pin RMS versions) for low-noise operation „ PSRR < -65dB at 1kHz (SC560A and fi xed output versions) All members of the SC560 family require an input voltage „ Over-temperature protection level between 2.5V and 5.5V. Output voltages for the „ Short-circuit protection adjustable versions can vary between 1.2V and 5.0V. Fixed „ Under-voltage lockout output voltage options are also chosen from this range. „ Power good monitor for output A (SC560C and fi xed output versions) The SC560A provides superior low-noise performance „ Independent enable/disable for LDOB (SC560B and by using an external bypass capacitor connected to pin fi xed output versions) 7 to fi lter the bandgap reference. The SC560B uses pin 7 „ MLPQ-UT8, 1.5mm x 1.5mm x 0.6mm package as a separate enable pin for the second regulator output so the two outputs can be controlled independently. Applications The SC560C uses this pin to provide a PGOOD output to hold a processor in reset when the voltage on OUTA „ PDAs and cellular phones is not in regulation. All other versions provide all three „ GPS devices functions with fi xed output voltages (no feedback pins „ Palmtop computers and handheld instruments are provided). „ TFT/LCD applications „ Wireless handsets The device also provides protection circuitry such as „ Digital cordless phones and PCS phones current limiting, under-voltage lockout, and thermal „ Personal communicators protection to prevent device failures. Stability is „ Wireless LAN 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 PGOOD VIN PGOOD VIN OUTA EN OUTA EN OUTB ENB OUTB ENB C IN C C C BYP OUTA OUTB BYP GND 2.2μF 22nF 1μF 1μF March 28, 2008 © 2008 Semtech Corporation 1 SC560 Pin Confi guration Ordering Information Device Package (1)(2)(3) SC560xULTRT MLPQ-UT8 1.5×1.5 (3) SC560xEVB Evaluation Board 8 1 7 Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. TOP VIEW (2) Available in lead-free package only. Device is WEEE and RoHS compliant. 2 6 (3) The device variant is denoted by the x. 3 5 4 MLPQ-UT-8; 1.5x1.5, 8 LEAD θ = 157°C/W JA Marking Information Pinout and Voltage Options Output Voltage Pin Options Part Options Device No. Code Pin 4 Pin7 Pin 8 V V LDOA LDOB 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 0n SC560E ENB BYP PGOOD 2.85V 2.85V 0K SC560F ENB BYP PGOOD 2.5V 1.8V 0L yw 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 < T < +85 A EN, ENB (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V + 0.3) V (V) .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 < V < 5.5 IN IN IN PGOOD (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V + 0.3) V , V (V) .... . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 < V < 5.0 IN OUTA OUTB OUT Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to (V + 0.3) IN OUTA, OUTB Short Circuit Duration . . . . . . . . Continuous (1) ESD Protection Level (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Thermal Information (2) Thermal Resistance, Junction to Ambient (°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 specifi cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters specifi ed 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 V = 3.6V, C = 2.2μF, C = C = 1μF, V = V = V , T = -40 to +85°C. Typical values are at T = 25°C. All IN IN OUTA OUTB EN ENB IN A A specifi cations apply to both LDOs unless otherwise noted. Parameter Symbol Conditions Min Typ Max Units Input Supply Voltage Range V 2.5 5.5 V IN Output Voltage V 1.2 5.0 V OUTx Output Voltage Accuracy ΔV V = 2.5V to 5.5V, I = 0 to 300mA -3 3 % OUTx IN OUTx Maximum Output Current I 300 mA MAX (1) Dropout Voltage V I = 200mA, V = 2.5V to 5.0V 100 200 mV D OUTx OUTx Shutdown Current I T = 25°C 0.1 1 μA SD A Quiescent Current I I = I = 0mA, T = 25°C 100 μA Q OUTA OUTB A Load Regulation ΔV I = 1mA to I 20 mV LOAD OUTx MAX Line Regulation ΔV I = 1mA -6 6 mV LINE OUTx (2) Feedback Regulation Voltage V 0.985 1 1.015 V FB Current Limit I 350 850 mA LIM 3 SC560 Electrical Characteristics (continued) Parameter Symbol Conditions Min Typ Max Units V = 3.7V, I = 50mA , IN OUTx 50 μV RMS 10Hz < f < 100kHz, C = 22nF BYP (3) Noise e N V = 3.7V, I = 50mA , IN OUTx 300 μV RMS 10Hz < f < 100kHz V = 3.7V, I = 50mA, f = 1kHz, IN OUTx 65 dB C = 22nF BYP Power Supply Rejection PSRR (3) Ratio V = 3.7V, I = 50mA, f = 1kHz 40 IN OUTx (4) PGOOD Delay t 160 200 240 ms DELAY Percentage of nominal output, (4) PGOOD Threshold V 82 87 92 % TH-PGOOD V falling OUTA From OFF to 87% V , I = 50mA, OUTx OUTx Start-Up Time t 1ms SU (2) C = 22nF BYP Power Up Delay Between LDOA and t Delay between V and V start-ups 128 μs (5) DELAY OUTA OUTB LDOB Under Voltage Lockout V V Rising 2.15 2.25 2.35 V UVLO IN UVLO Hysteresis V 100 mV UVLO-HYS Over Temperature Protection T Temperature Rising 160 °C OT Threshold Over Temperature Hysteresis T 20 °C OT-HYS Digital Inputs Logic Input High Threshold V V = 5.5V 1.25 V IH IN Logic Input Low Threshold V V = 2.5V 0.4 V IL IN Logic Input High Current I V = 5.5V 1 μA IH IN Logic Input Low Current I V = 5.5V 1 μA IL IN Digital Outputs PGOOD Output voltage Low V I = 500μA,V =3.7V 7 20 mV OL SINK IN Notes: (1) Dropout voltage is defi ned as V - V , when V is 100mV below the value of V at V = V + 0.5V. IN OUTx OUTx OUTx IN OUTx (2) SC560A, SC560B and SC560C only (3) Except SC560B and fi xed output versions (4) Except SC560A and SC560B (5) SC560A and SC560C only 4 SC560 Typical Characteristics Load Regulation — LDOA Load Regulation — LDOB V = 3.3V, V = 3.6V OUTA IN V = 2.8V, V = 3.6V OUTB IN 6 8 7 5 6 4 5 T =85°C A T =85°C A T =-40°C A 3 4 T =25°C A 3 2 T =25°C A T =-40°C 2 A 1 1 0 0 0 0 50 100 150 200 250 50 100 150 200 250 Output Current (mA) Output Current (mA) Line Regulation — LDOA Line Regulation — LDOB V = 2.8V, I = 1mA V = 3.3V, I = 1mA OUTB OUTB OUTA OUTA 2 3 2.5 1.5 2 1 1.5 1 0.5 TA=85°C T =85°C A T =25°C A 0.5 T =-40°C A 0 T =25°C 0 A T =-40°C A -0.5 -0.5 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 Input Voltage (V) Input Voltage (V) Dropout Voltage LDOA Dropout Voltage LDOB V = 3.3V, I = 200mA V = 2.8V, I = 200mA OUTA OUTA OUTB OUTB 300 400 350 250 300 200 250 150 200 TA=85°C T =85°C A 150 100 100 T =25°C A T =-40°C T =25°C A A 50 TA=-40°C 50 0 0 2.95 3 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3 3.05 3.1 Input Voltage (V) Input Voltage (V) 5 VIN - VOUT (mV) Output Voltage Variation (mV) Output Voltage Variation (mV) Output Voltage Variation (mV) VIN - VOUT (mV) Output Voltage Variation (mV) SC560 Typical Characteristics (continued) PSRR vs. Frequency (Both LDOs) PSRR vs. Frequency (Both LDOs) V = 2.8V, I =50mA, C =22nF OUT o BYP V = 2.8V, I = 50mA OUT O 0 0 -10 -10 -20 -20 -30 -30 -40 -50 -40 -60 -50 -70 -60 -80 -70 -90 10 100 1000 10000 10 100 1000 10000 Frequency (Hz) Frequency (Hz) Output Noise vs. Load Current (Both LDOs) Output Noise vs. Load Current (Both LDOs) V = 2.8V, V =3.7V, C =22nF OUT IN BYP VOUT = 2.8V, VIN = 3.7V, no CBYP 80 450 400 70 TA=85°C T=85°C 350 60 T =25°C A 300 50 T=25°C T =-40°C A 250 40 200 T=-40°C 30 150 20 100 10 50 0 0 0 50 100 150 200 250 0 50 100 150 200 250 Output Current (mA) Output Current (mA) Load Transient Response Load Transient Response Rising Edge (Both LDOs) Falling Edge (Both LDOs) V = 3.6V, V = 2.8V V = 3.6V, V = 2.8V IN OUT IN OUT I =10mA to OUT I =10mA to OUT 200ma 200ma (100mA/div) (100mA/div)) V OUT V (10mV/div) OUT (10mV/div) 6 PSRR (dB) Output Voltage Noise (μV) Output Voltage Noise (μV) PSRR (dB) SC560 Pin Confi gurations and Descriptions Pin # Pin Pin Function SC560 Name SC560A SC560B SC560C Fixed Output 1 1 1 1 OUTB Output for LDOB 2 2 2 2 VIN Input supply voltage terminal 3 3 3 3 OUTA Output for LDOA Feedback sense pin for LDOA — Connect this pin to an 444 FBA external resistor divider to set V OUTA 5 5 5 5 GND Analog and digital ground Logic input — active HIGH enables both LDOs for the SC560A and 666 6 EN SC560C, or LDOA for all other variants. 7 7 BYP LDO bypass output — Bypass with a 22nF capacitor 7 4 ENB Logic input — active HIGH enables LDOB for SC560B and SC560D Power Good output — monitors the level of LDOA, switches low 7 8 PGOOD when the output drops out of regulation. Feedback sense pin for LDOB — Connect this pin to an external 888 FBB resistor divider to set V OUTB 7 SC560 Block Diagrams SC560A VIN VIN 2 VREF 7 BYP UVLO VIN 3 OUTA GND 5 O/T LDOA 4 FBA VIN Power- 1 OUTB ON EN 6 LDOB Logic 8 FBB SC560B VIN VIN 2 VREF UVLO VIN 3 OUTA GND 5 O/T LDOA 4 FBA EN 6 VIN Power- 1 OUTB ON LDOB Logic 8 FBB ENB 7 8 SC560 Block Diagrams (continued) SC560C VIN VIN 2 7 VREF PGOOD PGOOD UVLO Logic VIN 3 OUTA 5 GND O/T LDOA 4 FBA VIN Power- 1 OUTB ON EN 6 LDOB Logic 8 FBB SC560 – Fixed Output Versions VIN 2 VIN VREF 7 BYP 8 PGOOD PGOOD UVLO Logic VIN 5 GND O/T LDOA OUTA 3 6 EN VIN Power- ON LDOB 1 OUTB Logic 4 ENB 9 SC560 Applications Information General Description The SC560B and the fi xed output variants provide The SC560 is a family of dual output linear regulator devices a separate enable pin for LDOB which allows LDOA intended for applications where low dropout voltage, low and LDOB to be enabled independently. The EN pin supply current, and low output noise are critical. Each controls the LDOA output and the ENB provides the device provides a very simple, low cost solution for two same functionality relative to the LDOB output. The separate regulated outputs. Very little PCB area is required table shown below lists the eff ect of the polarity of the due to the miniature package size and the need for only EN and ENB signals on the outputs of LDOA and LDOB. four external capacitors. Since LDOB can be enabled separately, there is no timing relationship between the two outputs at startup. The linear regulators LDOA and LDOB are powered from a single input supply rail, and each provides 300mA of EN ENB LDOA LDOB 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 Low Low Off Off external resistor dividers to the feedback pins of each Low High Off Off LDO. All other versions of the SC560 have fi xed output voltage values shown in the Pinout and Voltage Options High Low On Off table. 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 The SC560C and the fi xed output variants have a PGOOD causes the device to enter a low power shutdown mode signal which monitors the output of LDOA and transitions where it typically draws 100nA from the input supply. high 200ms after LDOA has reached 87% of its regulation point. This can be used to hold a processor in reset when When EN transitions high, the output of LDOA is enabled. the output voltage is out of regulation. After a delay of 128μs, the output of LDOB is enabled. In the SC560C, when the output voltage of LDOA reaches Output Voltage Selection 87% of its regulation point, the delay timer starts and the The output voltage of each LDO for the SC560A, SC560B, PGOOD signal transitions high after a delay of 200ms. The and SC560C version is set independently using external power up/down sequence is shown in the timing diagram resistor dividers. Figure 2 illustrates the proper connection in Figure 1. for LDOA. OUTA FBA EN 87% 87% R 1 OUTA 200ms R 2 PGOOD 128μs 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 Short-Circuit Protection can be calculated using the equation: Each output has short-circuit protection. If the output current exceeds the current limit, the output voltage will  R  R drop and the output current will be limited until the load 1 2 V V OUT REF R current returns to a specifi ed level. If a short-circuit occurs 2 on the output of LDOA, the output of LDOB will also be where V = 1V. The value of R2 should be 100kΩ or disabled until the fault is removed and the load current REF less to ensure noise performance and stability. Values returns to a specifi ed level. signifi cantly less than 100kΩ will impact the quiescent current. Component Selection A capacitance of 1μF or larger on each output is Protection Features recommended to ensure stability. Ceramic capacitors The SC560 family provides the following protection of type X5R or X7R should be used because of their features to ensure that no damage is incurred in the low ESR and stable temperature coeffi cients. It is also event of a fault condition: recommended that the input be bypassed with a 2.2μF, • Under-Voltage Lockout low ESR X5R or X7R capacitor to minimize noise and • Over-Temperature Protection improve transient response. Note: Tantalum and Y5V • Short-Circuit Protection capacitors are not recommended. Under-Voltage Lockout The BYP pin on the SC560D and the fi xed output versions The Under-Voltage Lockout (UVLO) circuit protects the must have a minimum of 22nF connected to ground to device from operating in an unknown state if the input meet all noise-sensitive requirements. Increasing the voltage supply is too low. capacitance to 100nF will further improve PSRR and output noise. When the V drops below the UVLO threshold, the LDOs IN are disabled and PGOOD is held low (SC560C and fi xed output variants only). When V is increased above the IN hysteresis level, the LDOs are re-enabled into their previous states, provided EN has remained high. When powering up with V below the UVLO threshold, the IN LDOs remain disabled and PGOOD is held low (SC560C and fi xed 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 defi ned 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 fi xed output variants only). 11 Maximum Recommended Input Voltage SC560 Applications Information (continued) Thermal Considerations The following procedure can be followed to determine if Although each of the two LDOs in the SC560 can provide the thermal design of the system is adequate. The junction 300mA of output current, the maximum power dissipation temperature of the SC560 can be determined in known in the device is restricted by the miniature package size. operating conditions using the following equation: The graphs in Figure 3 and Figure 4 can be used as a guideline to determine whether the input voltage, output T = T +(P x θ ) J A D JA voltages, output currents, and ambient temperature of the system result in power dissipation within the operating where limits are met or if further thermal relief is required. T = Junction Temperature (°C) J T = Ambient Temperature (°C) 0.7 A P = Power Dissipation (W) D 0.6 θ = Thermal Resistance Junction to Ambient (°C/W) JA 0.5 Example 0.4 Vo=3.3V An SC560D is used to provide outputs of 2.8V, 150mA from Vo=1.5V LDOA and 1.8V, 200mA from LDOB. The input voltage is 0.3 4.2V, and the ambient temperature of the system is 40°C. 0.2 P = 0.15(4.2 – 2.8) + 0.2(4.2 – 1.8) 0.1 D ______ TA=+25°C, PD(MAX)= 0.8W = 0.69W - - - - T =+85°C, P = 0.41W A D(MAX) 0 2.5 3 3.5 4 4.5 5 5.5 6 Input Voltage (V) and Figure 3 — Safe Operating Limit T = 40 + (0.69 x 157) = 148.3°C J 1.6 Figures 3 and 4 show that the junction temperature 1.4 would be within the maximum specifi cation of 150°C 1.2 for this power dissipation. This means that operation of 1 the SC560 under these conditions is within the specifi ed TJ(Max)=150°C limits and the device would not require further thermal 0.8 relief measures. 0.6 T (Max)=125°C J 0.4 0.2 0 -40 -20 0 20 40 60 80 100 o Ambient Temperature ( C) Figure 4 — Maximum P vs. T D A 12 Maximum Power Dissipation (W) Maximum Total Output Current (A) SC560 Applications Information (continued) Layout Considerations • Connect all ground connections directly to the While layout for linear devices is generally not as critical as ground plane whenever possible to minimize for a switching application, careful attention to detail will ground potential diff erences on the PCB. ensure reliable operation. The diagram below illustrates • Ensure that the feedback resistors are placed as proper layout of a circuit using the SC560A. 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 U1 C4 C2 R1 R2 U1 = SC560A 13 SC560 Outline Drawing — MLPQ-UT8 A D B DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX - - A .018 .024 0.45 0.60 - - A1 .000 .002 0.00 0.05 (.006) (0.1524) A2 PIN 1 E b .006 .008 .010 0.15 0.20 0.25 INDICATOR D .059 BSC 1.50 BSC (LASER MARK) E .059 BSC 1.50 BSC e .016 BSC 0.40 BSC L 0.12 .014 0.16 0.30 0.35 0.40 N 8 8 aaa .004 0.10 bbb .004 0.10 A2 A SEATING aaa C PLANE C A1 LxN e 2 0.20 1 0.25 N bxN bbb C A B 0.17 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 DIM INCHES MILLIMETERS (.057) (1.45) C G .028 0.70 P .016 0.40 P (G) (Z) 2X (C) R .004 0.10 X .008 0.20 Y .030 0.75 Z .087 2.20 X R 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