100-mA ULTRA-LOW DROPOUT REGULATOR

LP2981 100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN www.ti.com SLVS521C – JULY 2004 – REVISED AUGUST 2005 FEATURES • Output Tolerance of – 0.75% (A Grade) – 1.25% (Standard Grade) Ultra-Low Dropout, Typically – 200 mV at Full Load of 100 mA – 7 mV at 1 mA Wide VIN Range…16 V Max Low IQ…600 µA Typ at Full Load of 100 mA Shutdown Current…0.01 µA Typ Fast Transient Response to Line and Load Overcurrent and Thermal Protection High Peak Current Capability PORTABLE APPLICATIONS • • • • • Mobile Phones Laptops Personal Digital Assistants (PDAs) Digital Cameras and Camcorders CD and MP3 Players DBV (SOT-23) PACKAGE (TOP VIEW) • • • • • • • VIN GND ON/OFF 1 2 3 5 4 VOUT NC NC − No connect; must be left open DESCRIPTION/ORDERING INFORMATION The LP2981 family of fixed-output, low-dropout regulators offers exceptional, cost-effective performance for both portable and nonportable applications. Available in fixed voltages of 2.8 V, 3 V, 3.3 V, and 5 V, the family has an output tolerance of 0.75% for the A-grade devices (1.25% for the standard grade) and is capable of delivering 100-mA continuous load current. Standard regulator features, such as overcurrent and overtemperature protection, are included. The LP2981 has features that make the regulator an ideal candidate for a variety of portable applications: • Low dropout: A PNP pass element allows a typical dropout of 200 mV at 100-mA load current and 7 mV at 1-mA load. • Low quiescent current: The use of a vertical PNP process allows for quiescent currents that are considerably lower than those associated with traditional lateral PNP regulators. • Shutdown: A shutdown feature is available, allowing the regulator to consume only 0.01 µA when the ON/OFF pin is pulled low. • Small packaging: For the most space-constrained needs, the regulator is available in the SOT-23 package. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2004–2005, Texas Instruments Incorporated LP2981 100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN SLVS521C – JULY 2004 – REVISED AUGUST 2005 www.ti.com ORDERING INFORMATION TJ PART GRADE VOUT (NOM) 2.8 V 3V A grade: 0.75% tolerance 3.3 V 5V –40°C to 125°C 2.8 V 3V Standard grade: 1.25% tolerance 3.3 V 5V (1) (2) SOT-23-5 – DBV PACKAGE (1) Reel of 3000 Reel of 250 Reel of 3000 Reel of 250 Reel of 3000 Reel of 250 Reel of 3000 Reel of 250 Reel of 3000 Reel of 250 Reel of 3000 Reel of 250 Reel of 3000 Reel of 250 Reel of 3000 Reel of 250 ORDERABLE PART NUMBER LP2981A-28DBVR LP2981A-28DBVT LP2981A-30DBVR LP2981A-30DBVT LP2981A-33DBVR LP2981A-33DBVT LP2981A-50DBVR LP2981A-50DBVT LP2981-28DBVR LP2981-28DBVT LP2981-30DBVR LP2981-30DBVT LP2981-33DBVR LP2981-33DBVT LP2981-50DBVR LP2981-50DBVT TOP-SIDE MARKING (2) LP6_ LP8_ LPC_ PREVIEW LP5_ LP7_ LPB_ PREVIEW Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. The actual top-side marking has one additional character that designates the assembly/test site. 2 www.ti.com LP2981 100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN SLVS521C – JULY 2004 – REVISED AUGUST 2005 FUNCTIONAL BLOCK DIAGRAM VIN ON/OFF VREF 1.23 V − + R1 VOUT R2 Overcurrent/ Overtemperature Protection GND BASIC APPLICATION CIRCUIT LP2981 VIN 1 µF (see Note A) GND 2 1 5 3.3 µF (see Note A) VOUT ON/OFF (see Note B) 3 4 NC (see Note C) A. B. C. Minimum COUT value for stability (can be increased without limit for improved stability and transient response) ON/OFF must be actively terminated. Connect to VIN if shutdown feature is not used. Pin 4 (NC) must be left open. Do not connect anything to this pin. Figure 1. 3 LP2981 100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN SLVS521C – JULY 2004 – REVISED AUGUST 2005 www.ti.com Absolute Maximum Ratings (1) over virtual junction temperature range (unless otherwise noted) MIN VIN VON/OFF VO VIN – VOUT IOUT θJA TJ Tstg (1) (2) (3) (4) (5) Continuous input voltage range ON/OFF input voltage range Output voltage range (2) Input/output voltage differential range (3) Output current (4) Package thermal impedance (4) (5) Operating virtual junction temperature Storage temperature range –65 –0.3 –0.3 –0.3 –0.3 MAX 16 16 9 16 UNIT V V V V Internally limited (short-circuit protected) 206 150 150 °C/W °C °C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. If load is returned to a negative power supply, the output must be diode clamped to GND. The PNP pass transistor has a parasitic diode connected between the input and output. This diode normally is reverse biased (VIN > VOUT), but will be forward biased if the output voltage exceeds the input voltage by a diode drop (see Application Information for more details). Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability. The package thermal impedance is calculated in accordance with JESD 51-7. Recommended Operating Conditions MIN VIN VON/OFF VIN – VOUT IOUT TJ (1) Supply input voltage ON/OFF input voltage Input-output differential Output current Virtual junction temperature Minimum VIN of 2.2 V is needed for proper biasing of LDO control circuitry. –40 2.2 (1) 0 0.7 MAX 16 VIN 11 100 125 UNIT V V V mA °C 4 www.ti.com LP2981 100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN SLVS521C – JULY 2004 – REVISED AUGUST 2005 Electrical Characteristics at specified free-air temperature range, VIN = VOUT(NOM) + 1 V, VON/OFF = 2 V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF (unless otherwise noted) PARAMETER TEST CONDITIONS IL = 1 mA IL = 1 mA to 100 mA VIN = [VOUT(NOM) + 1 V] to 16 V IL = 0 IL = 1 mA IL = 25 mA IL = 100 mA IL = 0 IL = 1 mA Ground pin current IL = 25 mA IL = 100 mA VON/OFF < 0.3 V (OFF) VON/OFF < 0.15 V (OFF) High = O/P ON VON/OFF ON/OFF input voltage (2) Low = O/P OFF VON/OFF = 0 VON/OFF = 5 V IOUT(PK) Vn ∆VOUT/∆VIN IOUT(MAX) (1) (2) Peak output current Output noise voltage (RMS) Ripple rejection Short-circuit current VOUT ≥ VOUT(NOM) – 5% BW = 300 Hz to 50 kHz, COUT = 10 µF f = 1 kHz, COUT = 10 µF RL = 0 (steady state) TA 25°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 105°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C –40°C to 125°C 25°C 25°C 25°C 25°C 150 400 160 63 150 5 15 400 160 63 150 0.01 –1 5 15 mA µV dB mA 1.6 0.5 0.15 0.01 –1 µA 1.4 1.6 0.5 0.15 0.01 0.05 600 200 80 65 200 70 7 1 LP2981A-xx MIN –0.75 –1 –2.5 0.007 TYP MAX 0.75 1 2.5 0.014 0.032 3 5 10 15 100 150 250 375 95 125 110 170 300 550 800 1500 0.8 2 5 1.4 V 0.01 0.05 600 200 80 65 200 70 7 1 LP2981-xx MIN –1.25 –2 –3.5 0.007 TYP MAX 1.25 2 %VNOM 3.5 0.014 0.032 3 5 10 15 100 150 250 375 95 125 110 170 300 550 800 1500 0.8 2 5 µA mV %/V UNIT ∆VOUT Output voltage tolerance Output voltage line regulation ∆VOUT/∆VIN VIN – VOUT Dropout voltage (1) IGND ION/OFF ON/OFF input current Dropout voltage is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a 1-V differential. This dropout specification does not apply to the 1.8-V option, as the minimum VIN = 2.2 V must be observed for proper biasing of LDO control circuitry. The ON/OFF input must be actively terminated. Connect to VIN if this function is not used (see Application Information). 5 LP2981 100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN SLVS521C – JULY 2004 – REVISED AUGUST 2005 www.ti.com APPLICATION INFORMATION Capacitors Input Capacitor (Cin) A minimum value of 1 µF (over the entire operating temperature range) is required at the input of the LP2981. In addition, this input capacitor should be located within 1 cm of the input pin and connected to a clean analog ground. There is no Equivalent Series Resistance (ESR) requirement for this capacitor, and the capacitance can be increased without limit. A good quality ceramic or tantalum capacitor can be used. Output Capacitor (Cout) As a PNP regulator, the LP2981 requires the output capacitor to meet both a minimum capacitance and ESR value. Required ESR values as a function of load current are provided for various output voltages, load currents, and capacitances (see Figures 1–4). • Minimum Cout: 3.3 µF (can be increased without limit to improve transient response stability margin) • ESR range: see Figure 2 through Figure 5 It is critical that both the minimum capacitance and ESR requirement be met over the entire operating temperature range. Depending on the type of capacitor used, both of these parameters can vary significantly with temperature (see capacitor characteristics section). ESR − Ω Load Current − mA ESR − Ω Load Current − mA Figure 2. 5-V/3.3-µF ESR Curves Figure 3. 5-V/10-µF ESR Curves ESR