ZLDO1117 1A Low Dropout Positive Regulator 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5.0V and Adjustable outputs Description Pin Assignments SOT223 ZLDO1117 is a low dropout positive adjustable or fixedmode regulator with 1A output current capability. The ZLDO1117 has a 2% tolerance across the industrial temperature range and is guaranteed to have lower than 1.2V dropout at full load current making it ideal to provide well-regulated outputs of 1.2V to 5.0V with input supply voltages up to 18V. The ZLDO1117 is ideally suited to provide well-regulated supplies for low voltage IC applications such as highspeed bus termination and low current 3.3V logic supply across the whole industrial temperature range. TO252 Features • • • • • • • • • 1.2V Maximum Dropout at Full Load Current 2% tolerance over temperature, line and load variations Fast Transient Response Output Current Limiting Built-in Thermal Shutdown Good Noise Rejection Suitable for use with MLCC capacitors -40 to 125°C Junction temperature range Available in “Green” Molding Compound (No Br, Sb) with lead free Finish/RoHS Compliant (Note 1) Typical Application circuit 1A I/O – 1.8V core regulator ZLDO1117-18 3.3V 4.7µF MLCC Issue 1 1.8V 4.7µF MLCC 1 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Absolute Maximum Ratings Parameter ........................................................................................................................................................................ Rating Input Supply Voltage (VIN) relative to GND ............................................................................................................... -0.3 to 18V 3 Junction Temperature (TJ) .............................................................................................................................................. 150°C Power Dissipation ............................................................................................................................................ See SOA curve Storage Temperature (TST)....................................................................................................................................-65 to +150°C 1.2 1 ILOAD (A) 0.8 0.6 SOA 0.4 0.2 0 0 5 10 15 VIN - VOUT (V) 20 25 Safe Operation Area (SOA) Curve These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating for extended periods may reduce device reliability. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. Human Body Model: ................................................. 4kV Machine Model: ..................................................... 400V Recommended operating conditions Parameter VIN Input voltage IO Output current TJ Operating Junction Temperature Range Package Thermal Data Thermal Resistance Package 4 Junction-to-Ambient, θJA Junction-to-Case, θJC SOT223-3L TO252-3L5 SOT223-3L4 TO252-3L5 107 73 16 12 Min Max Unit 6 18 1 125 V A °C 2.7 0.01 -40 Unit °C/W °C/W Notes: 3. ZLDO1117 contains an internal thermal limiting circuit that is designed to protect the regulator in the event that the maximum junction temperature exceeded. When activated, typically at 150°C, the regulator Output switches off and then back on as the die cools. 4. Test condition for SOT223-3L: TA = 27°C, no air flow, device mounted on 2”X2” polyimide PCB, 2 oz copper, 5.6mmX5.6mm pad. 5. Test condition for TO252-3L: TA = 27°C, no air flow, device mounted on 2”X2” polyimide PCB, 1 oz copper, 2cmX2cm pad. 6. Ensures correct operation without entering dropout. Device will continue to operate below this minimum input voltage under dropout conditions. Issue 1 2 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Electrical Characteristics (Under Operating Conditions) Parameter Reference Voltage Conditions ZLDO1117-ADJ ZLDO1117-1.2 ZLDO1117-1.5 ZLDO1117-1.8 Output Voltage ZLDO1117-2.5 ZLDO1117-3.3 ZLDO1117-5.0 ZLDO1117-ADJ Line Regulation ZLDO1117-xx ZLDO1117-ADJ ZLDO1117-1.2 ZLDO1117-1.5 Load Regulation ZLDO1117-1.8 ZLDO1117-2.5 ZLDO1117-3.3 ZLDO1117-5.0 Dropout Voltage (VIN-VOUT) Current Limit Minimum Load Current (Note 8) Quiescent current GND current Thermal Regulation Ripple Rejection Temperature Stability Notes: 7. 8. Issue 1 ZLDO1117ADJ/1.2/1.5/1.8 /2.5/3.3/5.0 ZLDO1117ADJ/1.2/1.5/1.8 /2.5/3.3/5.0 ZLDO1117-ADJ (VIN-VOUT) = 2V, IO = 10mA VOUT+1.4V < VIN < 10V, 10mA < IO < 1A IO = 10mA, VIN = 3.2V 0 < IO < 1A, 2.6V < VIN < 12V IO = 10mA, VIN = 3.5V 0 < IO < 1A, 2.9V < VIN < 12V IO = 10mA, VIN = 3.8V 0 < IO < 1A, 3.2V < VIN < 12V IO = 10mA, VIN = 4.5V 0 < IO < 1A, 3.9V < VIN < 12V IO = 10mA, VIN = 5.3V 0 < IO < 1A, 4.7V < VIN < 12V IO = 10mA, VIN = 7V 0 < IO < 1A, 6.4V < VIN < 12V IO = 10mA, VOUT+1.5V<VIN<12V IO = 0mA, VOUT+1.5V<VIN<12V VIN=3.3V,VADJ=0, 10mA<IO<1A, (Note 7, 8) VIN=2.7V, 10mA < IO < 1A, (Note 7, 8) VIN = 3V, 0 < IO < 1A, (Note 7, 8) VIN = 3.3V, 0 < IO < 1A, (Note 7, 8) VIN = 4V, 0 < IO < 1A, (Note 7, 8) VIN = 4.8V, 0 < IO < 1A, (Note 7, 8) VIN = 6.5V, 0 < IO < 1A, (Note 7, 8) IO = 1A, ΔVOUT = 1%VOUT TA Min Typ. 25 1.238 1.250 FT 1.225 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 FT 25 0 ~ 125 FT 1.188 1.176 1.485 1.470 1.782 1.764 2.475 2.450 3.267 3.235 4.95 4.900 Max 1.263 1.275 1.200 1.500 1.800 2.500 3.300 5.000 1.11 1.212 1.224 1.515 1.530 1.818 1.836 2.525 2.550 3.333 3.365 5.05 5.100 0.1 0.2 0.1 0.2 0.2 0.4 0.2 0.4 3 6 4 8 5 10 6.6 13 10 20 1.2 1.3 1.35 Unit V V V V V V V % % % % mV mV mV mV mV V 25 (VIN-VOUT) = 5V FT -40°C< TJ < 125°C ZLDO1117-xx VIN < 18V, IO = 0mA ZLDO1117-xx VIN = 7V 30ms pulse f = 120Hz, COUT = 25uF Tantalum, IOUT = 100mA, ZLDO1117-XXX VIN = VOUT+3V IO = 10mA FT FT 25 25 A 1. 1 60 2 5 mA 4 35 10 120 0.1 mA µA %/W 80 dB 0.5 % See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the package. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the difference between input and output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. 3 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Typical characteristics 0.06 0.5 0.4 0.05 Adjustable version ILOAD = 10mA 0.3 Line Regulation (%) ∆Vout (%) 0.2 0.1 0 -0.1 -0.2 VOUT+1.5V<VIN<12V, IOUT=10mA 0.04 0.03 0.02 0.01 -0.3 0 -0.4 -0.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 -0.01 Temperature (°C) -50 -25 Output voltage variation vs Temperature 0 25 50 Temperature (C) 75 100 125 Line regulation vs temperature 0.25 1.4 1.3 VIN=3.3V, 10mA<IOUT<1A TJ = 25ºC ∆VOUT = 1% of VOUT 1.2 Dropout voltage (V) Load Regulation (%) 0.2 0.15 0.1 1.1 1 0.9 0.8 0.05 0.7 0 0.6 -50 -25 0 25 50 Temperature (°C) 75 100 125 0 0.2 Load regulation vs temperature 0.4 IOUT (A) 0.6 0.8 1 Drop-out voltage vs current 70 Dropout vs Temperature 1.4 60 1.3 50 Dropout (V) IADJ (µA) IOUT=1A ∆VOUT = 1% of VOUT 1.2 1.1 40 30 1 20 0.9 10 0 0.8 -50 -25 0 25 50 Temperature (°C) 75 100 -50 125 -25 Drop-out voltage vs temperature Issue 1 0 25 50 Temperature (°C) 75 100 125 Adjust pin input current 4 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 ZLDO1117-2.5V CIN = 1µF, COUT = 10µF TANT IPRELOAD = 100mA, Istep = 500mA ZLDO1117-2.5V CIN = 1µF, COUT = 4.7µF MLCC IPRELOAD = 100mA, ISTEP = 500mA 10mV 10mV 0 0 -10mV -10mV 600mA 600mA 100mA 100mA Transient load regulation with 10µF tantalum capacitor Transient load regulation with 4.7µF MLCC capacitor ZLDO1117 2.5V CIN = 1µF, COUT = 4.7µF MLCC ILOAD = 100mA 10 0 5V 4V 10µs/div Transient line regulation with 4.7µF MLCC capacitor 90 Ripple Rejection (dB) 85 80 75 ILOAD = 100mA, VIN - VOUT = 3V 70 65 60 55 50 10 100 1,000 Frequency (Hz) 10,000 100,000 Ripple rejection Issue 1 5 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Pin Descriptions NAME Adj (GND) I/O I Pin # 1 VOUT O 2 VIN I 3 FUNCTION A resistor divider from this pin to the VOUT pin and ground sets the output voltage (Ground only for Fixed-Mode). The output of the regulator. A minimum of 4.7µF capacitor (0.05Ω ≤ ESR ≤ 0.5Ω) must be connected from this pin to ground to insure stability. For improved ac load response a larger output capacitor is recommended. The input pin of regulator. Typically a large storage capacitor (0.05Ω ≤ ESR ≤ 0.5Ω) is connected from this pin to ground to ensure that the input voltage does not sag below the minimum dropout voltage during the load transient response. This pin must always be 1.3V higher than VOUT in order for the device to regulate properly. Applications information The ZLDO1117 family of quasi-LDO regulators is easy to use. They are protected against short circuit and thermal overloads. (see block diagram). Thermal protection circuitry will shut down the regulator should the junction temperature exceed 150°C at the sense point. The ZLDO1117 is pin compatible with similar ‘1117 regulators and offers extended temperature range and improved regulation specifications. Operation The ZLDO1117 develops a 1.25V reference voltage between the output and the adjust terminal (see block diagram). By placing a resistor between these two terminals, a constant current is caused to flow through R1 and down through R2. For fixed output variants Resistors R1 and R2 are internal. Stability The ZLDO1117 requires an output capacitor as part of the device frequency compensation. As part of its improved performance over industry standard 1117 the ZLDO1117 is suitable for use with MLCC (Multi Layer Ceramic Chip) capacitors. A minimum of 4.7µF ceramic X7R, 4.7µF tantalum, or 47 µF of aluminum electrolytic is required. The ESR of the output capacitor should be less than 0.5Ω. Surface mount tantalum capacitors, which have very low ESR, are available from several manufacturers. When using MLCC capacitors avoid the use of Y5V dielectrics. Load Regulation For improved load regulation the ZLDO1117-ADJ should have the upper feedback resistor, R1, connected as close as possible to VOUT and the lower resistor, R2, connected as close as possible to the load GND return. This helps reduce any parasitic resistance in series with the load. Thermal Considerations ZLDO1117 series regulators have internal thermal limiting circuitry designed to protect the device during overload conditions. For continuous normal load conditions however, the maximum junction temperature rating of 125°C must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. For the SOT-223 and TO-252 packages, which are designed to be surface mounted, additional heat sources mounted near the device must also be considered. Heat sinking is accomplished using the heat spreading capability of the PCB and its copper traces. The θJC (junction to tab) of the TO-252 and SOT223 are 12°C/W and 16°C/W respectively. Issue 1 6 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Thermal resistances from tab to ambient can be as low as 30°C/W. The total thermal resistance from junction to ambient can be as low as 42~46°C/W. This requires a reasonable sized PCB with at least one layer of copper to spread the heat across the board and couple it into the surrounding air. Datasheet specifications using 2 oz copper and a 5mmx5mm pad with TA=27°C, no air flow yielded θJA (junction to tab) of 73°C/W and 107°C/W for TO-252 and SOT223 respectively. The thermal resistance for each application will be affected by thermal interactions with other components on the board. Some experimentation will be necessary to determine the actual value. Ripple Rejection When using the ZLDO1117 adjustable device the adjust terminal can be bypassed to improve ripple rejection. When the adjust terminal is bypassed the required value of the output capacitor increases. The device will require an output capacitor of 22µF tantalum or 150µF aluminum electrolytic when the adjust pin is bypassed. Normally, capacitor values on the order of 100µF are used in the output of many regulators to ensure good load transient response with large load current changes. Output capacitance can be increased without limit and larger values of output capacitance further improve stability and transient response. The curves for Ripple Rejection were generated using an adjustable device with the adjust pin bypassed. These curves will hold true for all values of output voltage. For proper bypassing, and ripple rejection approaching the values shown, the impedance of the adjust pin capacitor, at the ripple frequency, should be < R1. R1 is normally in the range of 100Ω to 200Ω. The size of the required adjust pin capacitor is a function of the input ripple frequency. At 120Hz, with R1 = 100Ω, the adjust pin capacitor should be >13µF. At 10kHz only 0.16µF is needed. For fixed voltage devices, and adjustable devices without an adjust pin capacitor, the output ripple will increase as the ratio of the output voltage to the reference voltage (VOUT/VREF). For example, with the output voltage equal to 5V, the output ripple will be increased by the ratio of 5V/1.25V. It will increase by a factor of four. Ripple rejection will be degraded by 12dB from the value shown on the curve. Issue 1 7 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Typical application circuits Using ⎧ R2 ⎫ VOUT = 1.25 • ⎨1 + ⎬ ⎩ R1 ⎭ then the output voltage becomes: ⎧ 330 ⎫ VOUT = 1.25 • ⎨1 + ⎬ = 5.0 V ⎩ 110 ⎭ Figure 1 Basic adjustable regulator with 5V output 1N4002 (See Note D) ZLDO1117 Vin IN Vout OUT ADJ VREF R1 IADJ 100 F (see Note A) 10 F (see Note C) CADJ (see Note B) R2 Figure 2 Adjustable regulator with IADJ errors ⎧ R2 ⎫ VOUT = 1.25 • ⎨1 + ⎬ + IADJ • R2 ⎩ R1 ⎭ Because IADJ typically is 55μA, its effect is negligible in most applications. A. B. C. D. E. ⎧ 330 ⎫ VOUT = 1.25 • ⎨1 + + 55 • 10 − 6 • 330⎬ = 5.02V ~ 0.4% 110 ⎭ ⎩ Output capacitor selection is critical for regulator stability. Larger Cout values benefit the regulator by improving transient response and loop stability. CADJ can be used to improve ripple rejection. If CADJ is used, a Cout that is larger in value than CADJ must be used. Cin is recommended if ZLDO1117 is not located near the power supply filter. An external diode is recommended to protect the regulator if the input instantaneously is shorted to GND. This device is designed to be stable with tantalum and MLCC capacitors with an ESR less than 0.47Ω. Issue 1 8 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Other typical circuits Figure 3 ZLDO1117 with extended output voltage ZLDO1117 VIN IN ADJ C1 10 F TTL T1 MMBT3904 R3 1k VOUT OUT R4 1k R1 121Ω 1% C2 100 F R2 365Ω 1% Figure 4 ZLDO1117 with disable function Figure 5 ZLDO1117 as a negative LDO Issue 1 9 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Ordering information Packaging (Note 3) ZLDO1117K12TC TO252-3L 1.2V ZLDO1117G12TA SOT223-3L ZLDO1117KTC TO252-3L Adjustable ZLDO1117GTA SOT223-3L ZLDO1117K15TC TO252-3L 1.5V ZLDO1117G15TA SOT223-3L ZLDO1117K18TC TO252-3L 1.8V ZLDO1117G18TA SOT223-3L ZLDO1117K25TC TO252-3L 2.5V ZLDO1117G25TA SOT223-3L ZLDO1117K33TC TO252-3L 3.3V ZLDO1117G33TA SOT223-3L ZLDO1117K50TC TO252-3L 5.0V ZLDO1117G50TA SOT223-3L Device Notes: Issue 1 Output voltage Status Reel Quantity Tape width Reel size Preview Preview Active Active Active Active Active Active Active Active Active Active Active Active 2500 1000 2500 1000 2500 1000 2500 1000 2500 1000 2500 1000 2500 1000 16 mm 12 mm 16 mm 12 mm 16 mm 12 mm 16 mm 12 mm 16 mm 12 mm 16 mm 12 mm 16 mm 12 mm 13” 7” 13” 7” 13” 7” 13” 7” 13” 7” 13” 7” 13” 7” 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes. 2. Pad layout as shown on Diodes Inc. suggested pad layout document ZLDO02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. 10 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 Package outlines SOT223 TO252 Issue 1 11 of 12 www.diodes.com June 2009 ©Diodes Incorporated ZLDO1117 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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