Series Low Dropout Regulators

www.DataSheet4U.com LM2931 Series Low Dropout Regulators March 2002 LM2931 Series Low Dropout Regulators General Description The LM2931 positive voltage regulator features a very low quiescent current of 1mA or less when supplying 10mA loads. This unique characteristic and the extremely low input-output differential required for proper regulation (0.2V for output currents of 10mA) make the LM2931 the ideal regulator for standby power systems. Applications include memory standby circuits, CMOS and other low power processor power supplies as well as systems demanding as much as 100mA of output current. Designed originally for automotive applications, the LM2931 and all regulated circuitry are protected from reverse battery installations or 2 battery jumps. During line transients, such as a load dump (60V) when the input voltage to the regulator can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both internal circuits and the load. The LM2931 cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided. The LM2931 family includes a fixed 5V output (±3.8% tolerance for A grade) or an adjustable output with ON/OFF pin. Both versions are available in a TO-220 power package, TO-263 surface mount package, and an 8-lead surface mount package. The fixed output version is also available in the TO-92 plastic and 6-Bump micro SMD packages. Features Very low quiescent current Output current in excess of 100 mA Input-output differential less than 0.6V Reverse battery protection 60V load dump protection −50V reverse transient protection Short circuit protection Internal thermal overload protection Mirror-image insertion protection Available in TO-220, TO-92, TO-263, SO-8 or 6-Bump micro SMD packages n Available as adjustable with TTL compatible switch n See AN-1112 for micro SMD considerations n n n n n n n n n n Connection Diagrams FIXED VOLTAGE OUTPUT TO-220 3-Lead Power Package TO-263 Surface-Mount Package 00525406 Front View 00525411 Top View 00525412 Side View 8-Pin Surface Mount TO-92 Plastic Package 00525408 Bottom View 00525407 Top View *NC = Not internally connected. Must be electrically isolated from the rest of the circuit for the micro SMD package. © 2002 National Semiconductor Corporation DS005254 www.national.com LM2931 Connection Diagrams (Continued) micro SMD Laser Mark 6-Bump micro SMD 00525439 00525438 Top View (Bump Side Down) ADJUSTABLE OUTPUT VOLTAGE TO-220 5-Lead Power Package TO-263 5-Lead Surface-Mount Package 00525409 Front View 00525413 Top View 00525414 Side View 8-Pin Surface Mount 00525410 Top View www.national.com 2 LM2931 Ordering Information Output Number 5V Package 3-Pin TO-220 3-Pin TO-263 TO-92 8-Pin SOIC * 6-Bump micro SMD Part Number LM2931T-5.0 LM2931AT-5.0 LM2931S-5.0 LM2931AS-5.0 LM2931Z-5.0 LM2931AZ-5.0 LM2931M-5.0 LM2931AM-5.0 LM2931IBPX-5.0 LM2931CT LM2931CS LM2931CM LM2931IBPX-3.3 Package Marking LM2931T-5.0 LM2931AT-5.0 LM2931S-5.0 LM2931AS-5.0 LM2931Z-5 LM2931AZ 2931M-5.0 2931AM-5.0 LM2931CT LM2931CS LM2931CM - Transport Media Rails Rails Rails Rails 1.8k Units per Box 1.8k Units per Box Rails Rails Tape and Reel Rails Rails Rails Tape and Reel NSC Drawing T03B TS3B Z03A M08A BPA06HTA T05A TS5B M08A BPA06HTB Adjustable, 3V to 24V 5-Pin TO-220 5-Pin TO-263 8-Pin SOIC 3.3V * 6-Bump micro SMD Note: The micro SMD package marking is a single digit manufacturing Date Code Only. 3 www.national.com LM2931 Typical Applications LM2931 Fixed Output 00525404 *Required if regulator is located far from power supply filter. **C2 must be at least 100 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the regulator. This capacitor must be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this capacitor is critical; see curve. LM2931 Adjustable Output 00525405 Note: Using 27k for R1 will automatically compensate for errors in VOUT due to the input bias current of the ADJ pin (approximately 1 µA). www.national.com 4 LM2931 Absolute Maximum Ratings (Note 1) Internal Power Dissipation (Note 2) (Note 4) Operating Ambient Temperature Range Maximum Junction Temperature Storage Temperature Range Lead Temp. (Soldering, 10 seconds) ESD Tolerance (Note 5) −40˚C to +85˚C 125˚C −65˚C to +150˚C 230˚C 2000V Internally Limited If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage Operating Range Overvoltage Protection LM2931A, LM2931C (Adjustable) LM2931 60V 50V 26V Electrical Characteristics for Fixed 3.3V Version VIN = 14V, IO = 10mA, TJ = 25˚C, C2 = 100µF (unless otherwise specified) (Note 2) Parameter Conditions Typ Output Voltage 4V ≤ VIN ≤ 26V, IO = 100 mA −40˚C ≤ TJ ≤ 125˚C Line Regulation Load Regulation Output Impedance Quiescent Current 4V ≤ VIN ≤ 26V 5mA ≤ IO ≤ 100mA 100mADC and 10mArms, 100Hz - 10kHz IO ≤ 10mA, 4V ≤ VIN ≤ 26V −40˚C ≤ TJ ≤ 125˚C IO = 100mA, VIN = 14V, TJ = 25˚C Output Noise Voltage Long Term Stability Ripple Rejection Dropout Voltage Maximum Operational Input Voltage Maximum Line Transient Reverse Polarity Input Voltage, DC Reverse Polarity Input Voltage, Transient RL = 500Ω, VO ≤ 5.5V, T = 1ms, τ ≤ 100ms VO ≥ −0.3V, RL = 500Ω T = 1ms, τ ≤ 100ms, RL = 500Ω fO = 120Hz IO = 10mA IO = 100mA 10Hz -100kHz, COUT = 100µF 15 330 13 80 0.05 0.30 33 70 −30 −80 0.2 0.6 26 50 −15 −50 mA µVrms mV/1000 hr dB VMAX VMIN VMIN VMIN VMIN 4 10 200 0.4 1.0 3.3 LM2931-3.3 Limit (Note 3) 3.465 3.135 3.630 2.970 33 50 VMAX VMIN VMAX VMIN mVMAX mVMAX mΩ mAMAX Units Electrical Characteristics for Fixed 5V Version VIN = 14V, IO = 10mA, TJ = 25˚C, C2 = 100 µF (unless otherwise specified) (Note 2) Parameter Conditions LM2931A-5.0 Typ Output Voltage 6.0V ≤ VIN ≤ 26V, IO = 100mA −40˚C ≤ TJ ≤ 125˚C Line Regulation 9V ≤ VIN ≤ 16V 6V ≤ VIN ≤ 26V 2 4 5 Limit (Note 3) 5.19 4.81 5.25 4.75 10 30 2 4 LM2931-5.0 Typ 5 Limit (Note 3) 5.25 4.75 5.5 4.5 10 30 VMAX VMIN VMAX VMIN mVMAX Units 5 www.national.com LM2931 Electrical Characteristics for Fixed 5V Version Parameter Conditions (Continued) VIN = 14V, IO = 10mA, TJ = 25˚C, C2 = 100 µF (unless otherwise specified) (Note 2) LM2931A-5.0 Typ Limit (Note 3) 50 LM2931-5.0 Typ 14 200 1.0 30 5 0.4 15 500 20 55 0.2 0.6 26 80 0.05 0.3 33 0.2 0.6 26 1.0 Limit (Note 3) 50 mVMAX mΩ mAMAX mAMAX mAMIN µVrms mV/1000 hr dBMIN VMAX VMIN Units Load Regulation Output Impedance Quiescent Current 5 mA ≤ IO ≤ 100mA 100mADC and 10mArms, 100Hz -10kHz IO ≤ 10mA, 6V ≤ VIN ≤ 26V −40˚C ≤ TJ ≤ 125˚C IO = 100mA, VIN = 14V, TJ = 25˚C 14 200 0.4 15 500 20 Output Noise Voltage Long Term Stability Ripple Rejection Dropout Voltage Maximum Operational Input Voltage Maximum Line Transient Reverse Polarity Input Voltage, DC Reverse Polarity Input Voltage, Transient 10Hz -100kHz, COUT = 100µF fO = 120 Hz IO = 10mA IO = 100mA 80 0.05 0.3 33 RL = 500Ω, VO ≤ 5.5V, T = 1ms, τ ≤ 100ms VO ≥ −0.3V, RL = 500Ω T = 1ms, τ ≤ 100ms, RL = 500Ω 70 −30 −80 60 −15 −50 70 −30 −80 50 −15 −50 VMIN VMIN VMIN Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: See circuit in Typical Applications. To ensure constant junction temperature, low duty cycle pulse testing is used. Note 3: All limits are guaranteed for TJ = 25˚C (standard type face) or over the full operating junction temperature range of −40˚C to +125˚C (bold type face). Note 4: The maximum power dissipation is a function of maximum junction temperature TJmax, total thermal resistance θJA, and ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJmax − TA)/θJA. If this dissipation is exceeded, the die temperature will rise above 150˚C and the LM2931 will go into thermal shutdown. For the LM2931 in the TO-92 package, θJA is 195˚C/W; in the SO-8 package, θJA is 160˚C/W, and in the TO-220 package, θJA is 50˚C/W; in the TO-263 package, θJA is 73˚C/W; and in the 6-Bump micro SMD package θJA is 290˚C/W. If the TO-220 package is used with a heat sink, θJA is the sum of the package thermal resistance junction-to-case of 3˚C/W and the thermal resistance added by the heat sink and thermal interface. If the TO-263 package is used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package: Using 0.5 square inches of copper area, θJA is 50˚C/W; with 1 square inch of copper area, θJA is 37˚C/W; and with 1.6 or more square inches of copper area, θJA is 32˚C/W. Note 5: Human body model, 100 pF discharged through 1.5 kΩ. Electrical Characteristics for Adjustable Version VIN = 14V, VOUT = 3V, IO = 10 mA, TJ = 25˚C, R1 = 27k, C2 = 100 µF (unless otherwise specified) (Note 2) Parameter Reference Voltage IO ≤ 100 mA, −40˚C ≤ Tj ≤ 125˚C, R1 = 27k Measured from VOUT to Adjust Pin Output Voltage Range Line Regulation Load Regulation Output Impedance Quiescent Current VOUT + 0.6V ≤ VIN ≤ 26V 5 mA ≤ IO ≤ 100 mA 100 mADC and 10 mArms, 100 Hz–10 kHz IO = 10 mA IO = 100 mA During Shutdown RL = 500Ω 0.2 0.3 40 0.4 15 0.8 1 1 Conditions Typ 1.20 Limit 1.26 1.14 1.32 1.08 24 3 1.5 1 Units Limit VMAX VMIN VMAX VMIN VMAX VMIN mV/VMAX %MAX mΩ/V mAMAX mA mAMAX www.national.com 6 LM2931 Electrical Characteristics for Adjustable Version Parameter Output Noise Voltage Long Term Stability Ripple Rejection Dropout Voltage Maximum Operational Input Vo