250mA Single LDO with Low IQ, Low Noise and High PSRR LDO ISL9021A Features The ISL9021A is a single LDO, which provides high performance, low input voltage and high PSRR. It delivers guaranteed continuous 250mA load current and is stable with 1µF to 4.7µF of output capacitance (±30%) with an ESR range of 5mΩ to 400mΩ. • High Performance LDO with 250mA Guaranteed Continuous Output Current The input voltage range for the ISL9021A is between 1.5V to 5.5V and the output voltage comes in many fixed voltage options with ±1.8% accuracy over-temperature, line and load ranges. The ISL9021A has typical PSRR of 75dB @ 10kHz and 50dB @ 1MHz. The reverse current protection feature prevents current from flowing back to the power source when the output voltage is pulled higher than the input. • Input Voltage Range: 1.5V to 5.5V • Output Voltage Range: 1.2V to 3.3V • High PSRR: 75dB @ 10kHz, 50dB @ 1MHz • Low Quiescent Current: 35µA • Dropout Voltage: <150mV @ 250mA • Stable with 1µF to 4.7µF Output Capacitance (±30%) with an ESR range of 5mΩ to 400mΩ • ±1.8% Output Accuracy Over-Temperature/Load/Line • Soft-start Limits Input Current Surge During Enable The ISL9021A is offered in tiny 4-bump 2mmx2mm WLCSP and 1.6mmx1.6mm 6 Ld µTDFN packages. • Current Limit and Overheat Protection Related Literature • Available in 2mmx2mm 4-bump WLCSP Package and 1.6mmx1.6mm 6 Ld µTDFN • See FN6867, ISL9021 “250mA Single LDO with Low IQ, Low Noise and High PSRR LDO” • Pb-free (RoHS compliant) • -40°C to +85°C Operating Temperature Range Applications • PDAs, Cell Phones and Smart Phones • Portable Instruments, MP3 Players • Handheld Devices including Medical Handhelds ISL9021A VIN (1.5V TO 5.5V) VIN VO EN GND VOUT ON ENABLE OFF C1 C2 C1, C2: 1µF X5R CERAMIC CAPACITOR FIGURE 1. TYPICAL APPLICATION May 27, 2011 FN7845.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. ISL9021A Block Diagram PASS ELEMENT VIN VOUT EN TEMP SENSOR CONTROL LOGIC SHORT-CIRCUIT PROTECTION THERMAL PROTECTION SOFT-START VOLTAGE AND REFERENCE GENERATOR + BANDGAP GND Pin Configurations ISL9021A (6 LD 1.6x1.6 µTDFN) TOP VIEW VIN 1 6 VO NC 2 5 NC EN 3 4 GND ISL9021A (4 BALL 2X2 WLCSP) TOP VIEW GND A2 B2 VOUT EN A1 B1 VIN 2 Pin Descriptions PIN µTDFN WLCSP NAME PIN # PIN # DESCRIPTION VIN 1 B1 IC Supply/LDO Input. Connect a 1µF capacitor to GND. NC 2, 5 - GND 4 A2 System ground pin. EN 3 A1 LDO Enable. When this signal goes high, the LDO is turned on. VO, VOUT 6 B2 LDO Output. Connect a 1µF to 4.7µF capacitor to GND. PAD - - No Connect. For µTDFN package option only. Connect it to the system ground. FN7845.0 May 27, 2011 ISL9021A Ordering Information PART NUMBER (Notes 1, 4) ISL9021AIINZ-T (Note 2) PART MARKING 021N VO Voltage (V) TEMP RANGE (°C) 3.3 -40°C to +85°C PACKAGE (Pb-free) 4 Ball 2x2 WLCSP PKG. DWG. # W2X2.4 ISL9021AIIMZ-T (Note 2) 021M 3.0 -40°C to +85°C 4 Ball 2x2 WLCSP W2X2.4 ISL9021AIIKZ-T (Note 2) 021K 2.85 -40°C to +85°C 4 Ball 2x2 WLCSP W2X2.4 ISL9021AIIFZ-T (Note 2) 021F 2.5 -40°C to +85°C 4 Ball 2x2 WLCSP W2X2.4 ISL9021AIICZ-T (Note 2) 021C 1.8 -40°C to +85°C 4 Ball 2x2 WLCSP W2X2.4 ISL9021AIIBZ-T (Note 2) 021B 1.5 -40°C to +85°C 4 Ball 2x2 WLCSP W2X2.4 ISL9021AIIWZ-T (Note 2) 021W 1.2 -40°C to +85°C 4 Ball 2x2 WLCSP W2X2.4 ISL9021AIRUNZ-T (Note 3) V6 3.3 -40°C to +85°C 6 Ld µTDFN L6.1.6X1.6 ISL9021AIRUMZ-T (Note 3) V5 3.0 -40°C to +85°C 6 Ld µTDFN L6.1.6X1.6 ISL9021AIRUKZ-T (Note 3) V4 2.85 -40°C to +85°C 6 Ld µTDFN L6.1.6X1.6 ISL9021AIRUJZ-T (Note 3) V3 2.8 -40°C to +85°C 6 Ld µTDFN L6.1.6X1.6 ISL9021AIRUFZ-T (Note 3) V2 2.5 -40°C to +85°C 6 Ld µTDFN L6.1.6X1.6 ISL9021AIRUCZ-T (Note 3) S6 1.8 -40°C to +85°C 6 Ld µTDFN L6.1.6X1.6 ISL9021AIRUBZ-T (Note 3) V0 1.5 -40°C to +85°C 6 Ld µTDFN L6.1.6X1.6 ISL9021AIRUWZ-T (Note 3) V7 1.2 -40°C to +85°C 6 Ld µTDFN L6.1.6X1.6 NOTES: 1. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free WLCSP and BGA packaged products employ special Pb-free material sets; molding compounds/die attach materials and SnAgCu - e1 solder ball terminals, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free WLCSP and BGA packaged products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 4. For Moisture Sensitivity Level (MSL), please see device information page for ISL9021A. For more information on MSL please see techbrief TB363. 3 FN7845.0 May 27, 2011 ISL9021A Absolute Maximum Ratings Thermal Information Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.5V All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3)V Thermal Resistance (Typical) θJA (°C/W) θJC (°C/W) 4 Ball WLCSP (Note 5) . . . . . . . . . . . . . . . . . 135.64 N/A 6 Lead µTDFN (Notes 6, 7) . . . . . . . . . . . . . 230 93 Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp Recommended Operating Conditions Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . -40°C to +85°C Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 to 5.5V ESD Rating Human Body Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000V Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250V Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2200V Latch-Up Passed at +85°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 5. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 6. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 7. For θJC, the “case temp” location is taken at the package top center. Electrical Specifications TA = -40°C to +85°C; VIN = (VO + 0.5V) to 5.5V with a minimum VIN of 1.5V; CIN = 1µF; CO = 1µF. Boldface limits apply over the operating temperature range, -40°C to +85°C. PARAMETER SYMBOL TEST CONDITIONS MIN (Note 10) TYP MAX (Note 10) UNIT 5.5 V 1.5 V DC CHARACTERISTICS Supply Voltage VIN Undervoltage Lockout Threshold VIN 1.5 VUVLO+ VIN Rising VUVLO- VIN Falling 1.425 1.3 1.375 V Ground Current IDD Output Enabled; IO = 0; VIN = 1.5V to 5.5V 35 50 µA Shutdown Current IDDS VIN = 5.5V, EN = Low, IO = 0 0.1 1.0 µA Output Voltage Accuracy Maximum Output Current IMAX Internal Current Limit ILIM Dropout Voltage (Notes 8, 9) VDO Thermal Shutdown Temperature TSD VIN = VO + 0.5V to 5.5V, IO = 1mA to 250mA, TJ = +25°C -0.8 +0.8 % VIN = VO + 0.5V to 5.5V, IO = 1mA to 250mA, TJ = -40°C to +125°C -1.8 +1.8 % Continuous 250 mA 260 mA IO = 250mA; VO > 1.8V 150 250 mV 160 °C 20 °C VIN = 4.5V, VO = 3.3V @ 1kHz 60 dB VIN = 4.5V, VO = 3.3V @ 10kHz 75 dB VIN = 4.5V, VO = 3.3V @ 1MHz 50 dB 8.5*V µVRM O S Thermal Shutdown Hysteresis AC CHARACTERISTICS Ripple Rejection (Note 8) VIN = 4.2V, TA = +25°C, BW = 10Hz to 100kHz, IO = 10mA Output Noise Voltage (Note 8) DEVICE START-UP CHARACTERISTICS Device Enable Time tEN Time from assertion of the EN pin to when the output voltage reaches 95% of the VO (nom) LDO Soft-start Ramp Rate tSSR Slope of linear portion of LDO output voltage ramp during start-up 4 250 600 µs 30 60 µs/V FN7845.0 May 27, 2011 ISL9021A Electrical Specifications TA = -40°C to +85°C; VIN = (VO + 0.5V) to 5.5V with a minimum VIN of 1.5V; CIN = 1µF; CO = 1µF. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued) PARAMETER SYMBOL MIN (Note 10) TEST CONDITIONS TYP MAX (Note 10) UNIT 0.4 V EN LOGIC CHARACTERISTICS Input Low Voltage VIL Input High Voltage VIH Input Leakage Current 1.1 V IIL, IIH 0.1 µA NOTES: 8. Limits established by characterization and are not production tested. 9. Dropout voltage is measured as VIN - VO, when VO is 4% lower than the value of VO 10. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not production tested. Typical Operating Performance 45 40 T = ROOM TEMP T = +45°C T = +85°C QUIESCENT CURRENT (µA) QUIESCENT CURRENT (µA) 45 35 30 25 T = 0°C 20 T = -25°C 15 T = -40°C 10 5 0 1.5 2.5 3.5 4.5 INPUT VOLTAGE (V) T = +45°C T = 0°C 20 T = -25°C 15 T = -40°C 10 5 1.5 2.5 3.5 4.5 INPUT VOLTAGE (V) 5.5 1.95 1.90 40 +25°C +85°C 1.85 30 T = 0°C 20 T = -40°C T = -25°C 10 1.80 -40°C 1.75 1.70 0 -10 3.5 25 T = +85°C Vo (V) QUIESCENT CURRENT (µA) T = ROOM TEMP 30 FIGURE 3. QUIESCENT CURRENT vs INPUT VOLTAGE (VOUT = 1.85V) FIGURE 2. QUIESCENT CURRENT vs INPUT VOLTAGE (VOUT = 0.9V) 50 35 0 5.5 T = +85°C T = +45°C T = ROOM TEMP 40 1.65 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 FIGURE 4. QUIESCENT CURRENT vs INPUT VOLTAGE (VOUT = 3.3V) 5 6.0 1.60 0 50 100 150 Io (mA) 200 250 300 FIGURE 5. LOAD REGULATION vs TEMPERATURE (VOUT = 1.85V) FN7845.0 May 27, 2011 ISL9021A Typical Operating Performance (Continued) 3.5 2.00 1.95 1.90 3.4 +25°C +85°C 3.3 1.80 +85°C Vo (V) Vo (V) 1.85 1.75 +25°C -40°C 1.70 1.65 3.2 -40°C 3.1 3.0 1.60 2.9 1.55 1.50 2.5 3.5 4.5 5.5 2.8 6.5 0 50 100 3.50 1.05 3.45 1.00 3.40 +85°C 3.30 3.25 -40°C 3.10 0.70 3.05 0.65 4.5 5.0 +25°C +85°C 5.5 6.0 -40°C 0.80 0.75 4.0 300 0.85 3.15 3.00 3.5 250 0.90 Vo (V) Vo (V) 0.95 +25°C 3.20 200 FIGURE 7. LOAD REGULATION vs TEMPERATURE (VOUT = 3.3V) FIGURE 6. LINE REGULATION vs TEMPERATURE (VOUT = 1.85V) 3.35 150 Io (mA) VIN(V) 0.60 0 50 VIN (V) 100 150 200 250 300 Io (mA) FIGURE 8. LINE REGULATION vs TEMPERATURE (VOUT = 3.3V) FIGURE 9. LOAD REGULATION vs TEMPERATURE (VOUT = 0.9V) VIN = 2.7V 1.00 0.95 VOUT = 1.85V COUT = 1µF VOUT +25°C +85°C Vo (V) 0.90 0.85 -40°C 0.80 0.75 IOUT 0.70 3.0 IOUT = 1mA TO 250mA 3.5 4.0 4.5 5.0 5.5 6.0 VIN (V) FIGURE 10. LINE REGULATION vs TEMPERATURE (VOUT = 0.9V) 6 FIGURE 11. LOAD TRANSIENT RESPONSE FN7845.0 May 27, 2011 ISL9021A Typical Operating Performance (Continued) VIN = 2.7V COUT = 4.7µF VOUT = 1.85V VOUT IOUT IOUT = 1mA TO 250mA FIGURE 12. LOAD TRANSIENT RESPONSE FIGURE 13. ENABLE FUNCTION (VIN = 3.6V, VOUT = 1.85V, COUT 1µF) -20 -30 VIN = 4.5VDC + 50mVAC COUT = 1µF PSRR (dB) -40 IO = 10mA -50 -60 -70 IO = 0A -80 -90 100 1k 10k 100k 1M FREQUENCY (Hz) FIGURE 14. POWER SUPPLY REJECTION vs FREQUENCY 7 FN7845.0 May 27, 2011 ISL9021A Functional Description The ISL9021A is a high performance low-dropout regulator (LDO) with 250mA sourcing capability. The extra low ground current makes this part a good choice for handheld product applications. The device also incorporates overcurrent, thermal shutdown, reverse current protections, and soft-start features. Thermal shutdown protects the device against overheating. Soft-start limits the start-up input current surges. In some applications, the output voltage may be externally pulled higher than the input, or the input voltage could be connected to ground, or connected to some voltage lower than the output side. The ISL9021A features reverse current protection; that can block the reverse current from output to input. Enable Control The ISL9021A has an enable pin. When EN is low, the IC is in shutdown mode. In this condition, all on-chip circuits are off, and the device draws minimum current, typically less than 0.1µA(typ). Driving this pin high will turn on the device. LDO Protections The ISL9021A offers several protection functions, making it ideal for use in battery-powered applications. The ISL9021A provides short-circuit protection by limiting the output current at current limit of 260mA (min). If the short circuit lasts long enough, the die temperature increases, and the over-temperature protection circuit will shut down the output. When the die temperature reaches about +145°C, thermal protection starts to work with output being loaded with at least 50mA. Once the die temperature drops to about +110°C, the LDO will resume operation beginning with a soft-start. The ISL9021A’s reverse current protection is intended to block reverse conduction if output voltage is higher than input voltage. Input and Output Capacitors The ISL9021A provides a linear regulator that has low quiescent current, fast transient response, and overall stable operation across the recommended operating conditions. A ceramic capacitor (X5R or X7R) with a capacitance of 1µF to 4.7µF with an ESR up to 400mΩ is suitable for the ISL9021A to maintain its output stability. The ground connection of the output capacitor should be routed directly to the GND pin of the device, and also placed close to the IC. Similarly for the input capacitor, usually a 1µF ceramic capacitor (X5R or 7R) is suitable for most cases, but if a large, fast rising load transient condition is expected, a higher value input capacitor may be necessary to achieve satisfactory performance. Board Layout Recommendations A good PCB layout is an important step to achieve good performance. It is recommended to design the board with separate ground planes for input and output, and connect both ground planes at the GND pin of the IC. Consideration should be taken when placing the components and routing the trace to minimize the ground impedance, and keep the parasitic inductance low. Usually the input/output capacitors should be placed as close to the IC as possible with a good ground connection. Revision History The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have the latest revision. DATE REVISION May 27, 2011 FN7845.0 CHANGE Initial Release Products Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks. Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a complete list of Intersil product families. *For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on intersil.com: ISL9021A To report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff FITs are available from our website at: http://rel.intersil.com/reports/search.php 8 FN7845.0 May 27, 2011 ISL9021A Package Outline Drawing L6.1.6x1.6 6 LEAD ULTRA THIN DUAL FLAT NO-LEAD COL PLASTIC PACKAGE (UTDFN COL) Rev 1, 11/07 2X 1.00 1.60 A 6 PIN 1 INDEX AREA PIN #1 INDEX AREA 6 B 4X 0.50 1 3 5X 0 . 40 ± 0 . 1 1X 0.5 ±0.1 1.60 (4X) 0.15 4 6 0.10 M C A B TOP VIEW 4 0.25 +0.05 / -0.07 BOTTOM VIEW ( 6X 0 . 25 ) SEE DETAIL "X" ( 1X 0 .70 ) 0 . 55 MAX 0.10 C C BASE PLANE (1.4 ) SIDE VIEW SEATING PLANE 0.08 C 0 . 2 REF C ( 5X 0 . 60 ) 0 . 00 MIN. 0 . 05 MAX. DETAIL "X" ( 4X 0 . 5 ) TYPICAL RECOMMENDED LAND PATTERN NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994. 3. Unless otherwise specified, tolerance : Decimal ± 0.05 4. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 5. Tiebar shown (if present) is a non-functional feature. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 identifier may be either a mold or mark feature. 9 FN7845.0 May 27, 2011 ISL9021A Wafer Level Chip Scale Package (WLCSP 0.4mm Ball Pitch) W2x2.4 2x2 ARRAY 4 BALL WAFER LEVEL CHIP SCALE PACKAGE D E PIN 1 TOP VIEW SYMBOL MILLIMETERS A 0.44 Min, 0.495 Nom, 0.55 Max A1 0.190 ±0.030 A2 0.305 ±0.025 b 0.270 ±0.030 D 1.155 ±0.020 D1 0.400 BASIC E 0.975 ±0.020 E1 0.400 BASIC e 0.400 BASIC SD 0.200 BASIC SE 0.00 BASIC NUMBER OF BUMPS: 4 Rev. 2 6/08 A2 A A1 NOTES: 1. All dimensions are in millimeters. b SIDE VIEW e ( D1 ) 2 SE e ( E1 ) 1 B A b SD BOTTOM VIEW For additional products, see www.intersil.com/product_tree Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 10 FN7845.0 May 27, 2011