LM9076M

LM9076 - 150mA Ultra-Low Quiescent Current LDO Regulator with Delayed Reset Output December 2003 LM9076 150mA Ultra-Low Quiescent Current LDO Regulator with Delayed Reset Output General Description The LM9076 is a 5 Volt, +/-2%, 150mA logic controlled voltage regulator. The regulator features an active low delayed reset output flag which can be used to reset a microprocessor system at turn-ON and in the event that the regulator input voltage falls below a minimum value. An external capacitor programs a delay time interval before the reset output pin can return high. Designed for automotive and industrial applications, the LM9076 contains a variety of protection features such as thermal shutdown, input transient protection and a wide operating temperature range. The LM9076 uses an PNP pass transistor which allows low drop-out voltage operation. Features n Ultra Low Ground Pin Current, 25µA typical for 100µA load n VOUT initial accuracy of +/-1% n VOUT accurate to +/2% over Load and Temperature Conditions n Low Dropout Voltage, 200mV typical with 150mA load n Low Off State Ground Pin current n Delayed RESET output pin for low VOUT detection n +70V/-50V Voltage Transients n Operational VIN up to +40V Typical Application 20083030 Package Outline 20083028 20083027 Top View Part Number LM9076BMA–5.0 See NS SOIC Package Number M08A Top View Part Number LM9076S–5.0 See NS TO-263 Package Number TS5 © 2004 National Semiconductor Corporation DS200830 www.national.com LM9076 Absolute Maximum Ratings (Note 1) VIN(DC) VIN(-Transient) t < 1ms, Duty Cycle < 1% SHUTDOWN Pin RESET Pin CDELAY Pin Storage Temperature Junction Temperature (TJ ) ESD, HBM, per AEC - Q100 - 002 ESD, MM, per AEC - Q100 - 003 -15V to +55V -50V -15V to +52V -0.3V to 20V -0.3V to VOUT +0.3V -65˚C to +150˚C +175C +/-2kV +/-250V VIN(+Transient) t < 10ms, Duty Cycle < 1% +70V Operating Ratings (Note 1) VIN Pin VSHUTDOWN Pin Ambient Temperature θja θjc Thermal Resistance M08A (Note 6) θja θjc 156˚C/W 59˚C/W Thermal Resistance TS5B (Note 6) 75˚C/W 2.9˚C/W 5.35V to 40V 0V to 40V −40˚C < TA < +125˚C Electrical Characteristics for LM9076–5.0 The following specifications apply for VIN= 14V; VSHUTDOWN = Open; ILOAD = 10mA; TA = +25˚C; COUT = 10µF, 0.5Ω < ESR < 4.0Ω; unless otherwise specified. Bold Values indicate −40˚C ≤ TA≤ 125˚C. (Note 4, Note 5) Symbol VOUT Parameter Output Voltage 1mA ≤ ILOAD ≤ 150mA VIN = 60V, RLOAD = 1KΩ, t ≤ 40ms Output Voltage Off Reverse Battery ∆VOUT Line Regulation VSHUTDOWN ≥ 2V, RLOAD = 1KΩ VIN = -15V, RLOAD = 1KΩ 9.0V ≤ VIN ≤ 16V, ILOAD = 10mA 16V ≤ VIN ≤ 40V, ILOAD = 10mA Load Regulation VDO Dropout Voltage 1mA ≤ ILOAD ≤ 150mA ILOAD = 10mA ILOAD = 50mA ILOAD = 150mA IGND Ground Pin Current 9V ≤ VIN ≤ 16V, ILOAD = 100uA 9V ≤ VIN ≤ 40V, ILOAD = 10mA 9V ≤ VIN ≤ 40V, ILOAD = 50mA 9V ≤ VIN ≤ 16V, ILOAD = 150mA Ground Pin Current in Shut- down Mode ISC PSRR VOUT Short Circuit Current Ripple Rejection 9V ≤ VIN ≤ 40V, VSHUTDOWN = 2V VIN = 14V, RLOAD = 1Ω VIN = (14VDC) + (1VRMS @ 120Hz) ILOAD = 50mA (Note 3) Conditions Min 4.95 4.90 4.50 Typ 5.00 5.00 5.00 Max 5.05 5.10 5.50 Units V V V LM9076–5.0 REGULATOR CHARACTERISTICS – – – – – – – – – – – – – 200 40 0 4 17 42 30 80 150 25 125 0.6 3.6 15 400 250 –300 25 25 60 50 – 250 35 160 – 4.5 25 750 – mV mV mV mV mV mV mV mV µA µA mA mA µA mA 50 60 dB RESET PIN CHARACTERISTICS VOR Minimum VIN for valid RESET Status – 1.3 2.0 V www.national.com 2 LM9076 Electrical Characteristics for LM9076–5.0 Symbol VTHR VOH Parameter VOUT Threshold for RESET Low RESET pin high voltage RESET pin low voltage CDELAY Charging Current CDELAY pin low voltage Reset Delay Time Conditions (Note 3) External pull-up resistor to VOUT = 100kΩ CDELAY < 4.0V, ISINK = 250µA VIN = 14V, VDELAY = 0V VOUT < 4.0V, ISINK = IDELAY VIN = 14V, CDELAY = 0.001uF VOUT rising from 0V, ∆t from VOUT > VOR to RESET pin HIGH VSHUTDOWN pin falling from 5.0V until Vout > 4.5V (Vout = On) VSHUTDOWN pin rising from 0V until Vout < 0.5V (Vout = Off) VSHUTDOWN = 40V VSHUTDOWN = 5V VSHUTDOWN = 2V IIL(SD) SHUTDOWN Input Low Bias Current VSHUTDOWN = 0V (Continued) The following specifications apply for VIN= 14V; VSHUTDOWN = Open; ILOAD = 10mA; TA = +25˚C; COUT = 10µF, 0.5Ω < ESR < 4.0Ω; unless otherwise specified. Bold Values indicate −40˚C ≤ TA≤ 125˚C. (Note 4, Note 5) Min 0.83 VOUT X 0.90 Typ 0.89 VOUT X 0.99 Max 0.94 VOUT Units X VOUT (Nom) V RESET PIN CHARACTERISTICS VOL – 0.2 0.3 V CDELAY PIN CHARACTERISTICS IDELAY VOL tDELAY -0.35 — 9.5 -0.42 0.100 11.9 -0.50 — 14.3 uA V ms SHUTDOWN CONTROL LOGIC — LM9076BMA Only VIL(SD) SHUTDOWN Input Low Threshold Voltage SHUTDOWN Input High Threshold Voltage SHUTDOWN Pin High Bias Current 1 1.5 — V VIH(SD) — — — — — 1.5 35 15 6 0 2 V µA IIH(SD) 35 10 — µA µA µA Note 1: Absolute Maximum Ratings indicate the limits beyond which the device may cease to function, and/or damage to the device may occur. Note 2: Operating Ratings indicate conditions for which the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and conditions refer to the Electrical Characteristics Note 3: Not Production tested, Guaranteed by Design. Minimum, Typical, and/or Maximum values are provided for informational purposes only. Note 4: Pulse testing used maintain constant junction temperature (TJ ). Note 5: The regulated output voltage specification is not guaranteed for the entire range of VIN and ouput loads. Device operational range is limited by the maximum junction temperature (T J ). The junction temperature is influenced by the ambient temperature (T A ), package selection, input voltage (VIN ), and the output load current. When operating with maximum load currents the input voltage and/or ambient temperature will be limited. When operating with maximum input voltage the load current and/or the ambient temperature will be limited. Note 6: Worst case (FREE AIR) per EIA/JESD51–3. 3 www.national.com LM9076 Typical Performance Characteristics Output Capacitor ESR Output Capacitor ESR 20083031 20083032 Low Voltage Behavior High Voltage Behavior 20083033 20083034 Dropout Voltage Ground Pin Current vs Load Current 20083036 20083037 www.national.com 4 LM9076 Typical Performance Characteristics Output Voltage vs Junction Temperature (Continued) 20083038 Application Information REGULATOR BASICS This regulator is suitable for Automotive applications where continuous connection to the battery is required (refer to the Typical Application circuit). The pass transistor of the regulator is an PNP device. A 10uF capacitor on the VOUT pin will provide adequate performance in most circumstances. There is no maximum value for the regulator output bypass capacitance. INPUT CAPACITOR The LM9076 requires a low source impedance to maintain regulator stability because portions of the internal bias circuitry are connected directly to VIN. At a minimum, at 0.1µF ceramic capacitor should be placed between the LM9076 VIN and Ground pins, as close as is physically possible. OUTPUT CAPACITOR An output capacitor is also required for stability. This capacitor must be placed between the LM9076 VOUT and Ground pins, as close as is physically possible, using traces that are not part of the main load current path. The output capacitor must meet the requirements for minimum capacitance and also maintain the appropriate ESR value of the full operating ambient temperature range to assure stability. There is no maximum limit for the output capacitance value, as long as ESR is maintained. See the Typical Performance Characteristics curves for details. Solid tantalum capacitors are recommended as they generally maintain capacitance and ESR ratings over a wide temperature range. Ceramic capacitor types XR7 and X5R may be used if a series resistor is added to simulate the ESR requirement. Aluminum electrolytic capacitors are not recommend, as they are subject to wide changes in capacitance and ESR values across temperature. DELAY CAPACITOR The capacitor on the Delay pin must be a low leakage type since the charge current is minimal (500nA typical) and the pin must fully charge to 5V. Ceramic, Mylar, and polystyrene 5 capacitor types are generally recommended, although changes in capacitance values across temperature changes will have some effect on the delay timing. SHUTDOWN PIN The basic On/Off control of the regulator is accomplished with the SHUTDOWN pin. By pulling the SHUTDOWN pin high the regulator output is switched Off. When the regulator is switched Off the load on the battery will be primarily due to the SHUTDOWN pin current. When the SHUTDOWN pin is low, or left open, the regulator is switched On. When an unregulated supply, such as V BATTERY , is used to pull the SHUTDOWN pin high a series resistor in the range of 10KΩ to 50KΩ is recommended to provide reverse voltage transient protection of the SHUTDOWN pin. Adding a small capacitor (0.001uF typical) from the SHUTDOWN pin to Ground will add noise immunity to prevent accidental turn on due to noise on the supply line. RESET FLAG Proper operation of the RESET circuity is not guaranteed for VIN voltages of less than 2.0V. The RESET pin will provide information on the status of the regulator VOUT voltage level. Any condition that causes the VOUT voltage to drop to typically 89% normal would cause the RESET pin to go low. This will warn of a system Vcc supply that may cause abnormal operation. Of course, when the regulator is switched Off in normal operation the RESET pin will be low. If the regulator is On, and then switched off, the RESET flag will go low when the VOUT voltage stored on the output capacitor has decayed adequately. Excessive thermal dissipation of the device such that the Thermal Shutdown circuit is activated which then switches the regulator output Off, would cause the RESET pin to go low. The RESET pin is an open collector output and requires an external pull-up resistor to VOUT . The external pull-up resistor should be in the range of 10KΩ to 200KΩ. www.national.com LM9076 Application Information RESET DELAY TIME (Continued) tDELAY = VOUT X (0.001uF / 0.475uA) tDELAY = 5.0V X (0.001uF / 0.420uA) = 11.9ms THERMAL PROTECTION Device operational range is limited by the maximum junction temperature (TJ). The junction temperature is influenced by the ambient temperature (TA), package selection, input voltage (VIN), and the output load current. When operating with maximum load currents the input voltage and/or ambient temperature will be limited. When operating with maximum input voltage the load current and/or the ambient temperature will be limited. Even though the LM9076 is equipped with circuitry to protect itself from excessive thermal dissipation, it is not recommended that the LM9076 be operated at, or near, the maximum recommended die junction temperature (TJ) as this may impair long term device reliability. The thermal protection circuity monitors the temperature at the die level. When the die temperature exceeds typically 160C the voltage regulator output will be switched off. When the regulator output is switched On, or after recovery from brief VOUT fault condition, the RESET flag can be can be programmed to remain low for an additional delay time. This will give time for any system reference voltages, clock signals, etc., to stabilize before the micro-controller resumes normal operation. This delay time is controlled by the capacitor value on the CDELAY pin. During normal operation the CDELAY capacitor is charged to near VOUT . When a VOUT fault causes the RESET pin to go low, the CDELAY capacitor is quickly discharged to ground. When the VOUT fault is removed, and VOUT returns to the normal operating value, the CDELAY capacitor begins charging at a typical constant 0.420uA rate. When the voltage on the CDELAY capacitor reaches the same potential as the VOUT pin the RESET pin will be allowed to return high. The typical RESET delay time can be calculated with the following formula: tDELAY = VOUT X (CDELAY / IDELAY ) For a CDELAY value of 0.001uF and a IDELAY value of 0.475uA the typical RESET delay time is: www.national.com 6 LM9076 Physical Dimensions inches (millimeters) unless otherwise noted 5-Lead Order Number LM9076S NS Package Number TS5B 7 www.national.com LM9076 - 150mA Ultra-Low Quiescent Current LDO Regulator with Delayed Reset Output Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Lead (0.150" Wide) Molded SO Package Order Number LM9076M NS Package Number M08A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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