LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 LP2952/LP2952A/LP2953/LP2953A Adjustable Micropower Low-Dropout Voltage Regulators Check for Samples: LP2952-N, LP2952A, LP2953, LP2953A FEATURES DESCRIPTION • • • • • • • • • • The LP2952 and LP2953 are micropower voltage regulators with very low quiescent current (130 μA typical at 1 mA load) and very low dropout voltage (typ. 60 mV at light load and 470 mV at 250 mA load current).
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com Block Diagrams LP2952 Figure 1. LP2953 Figure 2.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 Pinout Drawings LP2952 14-Pin PDIP/NFF LP2953 16-Pin PDIP/NBG Figure 3. Figure 4. LP2952 16-Pin SOIC/D Figure 5. Copyright © 2004–2013, Texas Instruments Incorporated LP2953 16-Pin SOIC/D Figure 6.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS (1) Storage Temperature Range −65°C ≤ TA ≤ +150°C Operating Temperature Range LP2952I, LP2953I, LP2952AI, LP2953AI, LP2952I-3.3, LP2953I-3.3, LP2952AI-3.3, LP2953AI-3.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 ELECTRICAL CHARACTERISTICS: 3.3V VERSIONS Limits in standard typeface are for TJ = 25°C, bold typeface applies over the full operating temperature range. Limits are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CL = 2.2 μF for 5V parts and 4.7 μF for 3.3V parts.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com ALL VOLTAGE OPTIONS ELECTRICAL CHARACTERISTICS Limits in standard typeface are for TJ = 25°C, bold typeface applies over the full operating temperature range. Limits are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CL = 2.2 μF for 5V parts and 4.7 μF for 3.3V parts.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 ALL VOLTAGE OPTIONS ELECTRICAL CHARACTERISTICS (continued) Limits in standard typeface are for TJ = 25°C, bold typeface applies over the full operating temperature range. Limits are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CL = 2.2 μF for 5V parts and 4.7 μF for 3.3V parts.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com ALL VOLTAGE OPTIONS ELECTRICAL CHARACTERISTICS (continued) Limits in standard typeface are for TJ = 25°C, bold typeface applies over the full operating temperature range. Limits are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CL = 2.2 μF for 5V parts and 4.7 μF for 3.3V parts.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified: VIN = 6V, IL = 1 mA, CL = 2.2 μF, VSD = 3V, TA = 25°C, VOUT = 5V. Quiescent Current Quiescent Current Figure 7. Figure 8. Ground Pin Current vs Load Ground Pin Current Figure 9. Figure 10. Ground Pin Current Output Noise Voltage Figure 11. Figure 12.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: VIN = 6V, IL = 1 mA, CL = 2.2 μF, VSD = 3V, TA = 25°C, VOUT = 5V. 10 Ripple Rejection Ripple Rejection Figure 13. Figure 14. Ripple Rejection Line Transient Response Figure 15. Figure 16. Line Transient Response Output Impedance Figure 17. Figure 18.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: VIN = 6V, IL = 1 mA, CL = 2.2 μF, VSD = 3V, TA = 25°C, VOUT = 5V. Load Transient Response Load Transient Response Figure 19. Figure 20. Dropout Characteristics Enable Transient Figure 21. Figure 22. Enable Transient Short-Circuit Output Current and Maximum Output Current Figure 23. Figure 24.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: VIN = 6V, IL = 1 mA, CL = 2.2 μF, VSD = 3V, TA = 25°C, VOUT = 5V. 12 Feedback Bias Current Feedback Pin Current Figure 25. Figure 26. Error Output Comparator Sink Current Figure 27. Figure 28. Divider Resistance Dropout Detection Comparator Threshold Voltages Figure 29. Figure 30.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: VIN = 6V, IL = 1 mA, CL = 2.2 μF, VSD = 3V, TA = 25°C, VOUT = 5V. Thermal Regulation Minimum Operating Voltage Figure 31. Figure 32. Dropout Voltage Figure 33.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 APPLICATION HINTS Heatsink Requirements (Industrial Temperature Range Devices) The maximum allowable power dissipation for the LP2952/LP2953 is limited by the maximum junction temperature (+125°C) and the external factors that determine how quickly heat flows away from the part: the ambient temperature and the junction-to-ambient thermal resistance for the specific application.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com Figure 35 shows copper patterns which may be used to dissipate heat from the LP2952 and LP2953. Table 2 shows some values of junction-to-ambient thermal resistance (θJ–A) for values of L and W for 1 oz. copper. * For best results, use L = 2H ** 14-Pin PDIP is similar, refer to Table 1 for pins designated for heatsinking. Figure 35. Copper Heatsink Patterns Table 2.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 The KOVAR lead frame does not conduct heat as well as copper, which means that the PC board copper can not be used to significantly reduce the overall junction-to-ambient thermal resistance in applications using the LP2953AMJ part.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com Figure 36. Power Derating Curve for LP2953AMJ Programming the Output Voltage The regulator may be pin-strapped for 5V operation using its internal resistive divider by tying the Output and Sense pins together and also tying the Feedback and 5V Tap pins together. Alternatively, it may be programmed for any voltage between the 1.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 Dropout Detection Comparator This comparator produces a logic “LOW” whenever the output falls out of regulation by more than about 5%. This figure results from the comparator's built-in offset of 60 mV divided by the 1.23V reference (refer to Block Diagrams). The 5% low trip level remains constant regardless of the programmed output voltage.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com This gives a value of about 0.1 μF. When this is used, the output capacitor must be 6.8 μF (or greater) to maintain stability. The 0.1 μF capacitor reduces the high frequency gain of the circuit to unity, lowering the output noise from 260 μV to 80 μV using a 10 Hz to 100 kHz bandwidth. Also, noise is no longer proportional to the output voltage, so improvements are more pronounced at high output voltages.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 Typical Applications Figure 39. Basic 5V Regulator * Output voltage equals +VIN minum dropout voltage, which varies with output current. Current limits at a maximum of 380 mA (typical). ** Select R1 so that the comparator input voltage is 1.23V at the output voltage which corresponds to the desired fault current value. Figure 40. 5V Current Limiter with Load Fault Indicator Figure 41. Low T.C.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com * Connect to Logic or μP control inputs. LOW BATT flag warns the user that the battery has discharged down to about 5.8V, giving the user time to recharge the battery or power down some hardware with high power requirements. The output is still in regulation at this time. OUT OF REGULATION flag indicates when the battery is almost completely discharged, and can be used to initiate a power-down sequence. Figure 42.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 * RT = 1 MEG, CT = 0.1 μF Figure 45. Timing Diagram for Timed Power-On Reset * Turns ON at VIN = 5.87V Turns OFF at VIN = 5.64V (for component values shown) Figure 46. 5V Regulator with Snap-On/Snap-Off Feature and Hysteresis * Connect to Logic or μP control inputs. OUTPUT has SNAP-ON/SNAP-OFF feature. LOW BATT flag warns the user that the battery has discharged down to about 5.
LP2952-N, LP2952A, LP2953, LP2953A SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 www.ti.com Figure 48. 5V Regulator with Timed Power-On Reset, Snap-On/Snap-Off Feature and Hysteresis Td = (0.28) RC = 28 ms for components shown. Figure 49.
LP2952-N, LP2952A, LP2953, LP2953A www.ti.com SNVS095D – MAY 2004 – REVISED SEPTEMBER 2013 REVISION HISTORY Changes from Revision C (March 2005) to Revision D • Page layout of National Data Sheet to TI format .........................................................................................................................
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LP2952AIM NRND SOIC D 16 48 TBD Call TI Call TI -40 to 125 LP2952AIM LP2952AIM-3.3/NOPB ACTIVE SOIC D 16 48 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LP2952AIM -3.
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LP2952AIMX SOIC D 16 2500 330.0 16.4 6.5 10.3 2.3 8.0 16.0 Q1 LP2952AIMX/NOPB SOIC D 16 2500 330.0 16.4 6.5 10.3 2.3 8.0 16.0 Q1 LP2952IMX-3.3/NOPB SOIC D 16 2500 330.0 16.4 6.5 10.3 2.3 8.0 16.
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP2952AIMX SOIC D 16 2500 367.0 367.0 35.0 LP2952AIMX/NOPB SOIC D 16 2500 367.0 367.0 35.0 LP2952IMX-3.3/NOPB SOIC D 16 2500 367.0 367.0 35.0 LP2952IMX/NOPB SOIC D 16 2500 367.0 367.0 35.0 LP2953AIMX/NOPB SOIC D 16 2500 367.0 367.0 35.0 LP2953IMX/NOPB SOIC D 16 2500 367.0 367.0 35.
MECHANICAL DATA NBG0016G www.ti.
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