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LP3972 Datasheet(PDF) 12 Page - Texas Instruments |
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LP3972 Datasheet(HTML) 12 Page - Texas Instruments |
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12 / 59 page  1 1e1 1e2 1e3 1e4 OUTPUT CURRENT (mA) 0.00 20.00 40.00 60.00 80.00 100.00 VIN = 3.5V VIN = 3V 1 1e1 1e2 1e3 1e4 OUTPUT CURRENT (mA) 0.00 18.00 36.00 54.00 72.00 90.00 VIN = 4.5V VIN = 4V LP3972 SNVS468J – SEPTEMBER 2006 – REVISED AUGUST 2011 www.ti.com Buck Converters SW1, SW2, SW3 Unless otherwise noted, VIN = 3.6V, CIN = 10 µF, COUT = 10 µF, LOUT = 2.2 µH ceramic. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, −40°C to +125°C. (1) (2) (3) and (4). Symbol Parameter Test Conditions Min Typ Max Unit VOUT Output Voltage Accuracy Default VOUT −3 +3 % Eff Efficiency Load Current = 500 mA 95 % ISHDN Shutdown Supply Current EN is de-asserted 0.1 µA Sync Mode Clock Frequency Synchronized from 13 MHz System Clock 10.4 13 15.6 MHz fOSC Internal Oscillator Frequency 2.0 MHz IPEAK Peak Switching Current Limit 2.1 2.4 A IQ Quiescent Current "On" No Load PFM Mode 21 µA No Load PWM Mode 200 RDSON (P) Pin-Pin Resistance PFET 240 m Ω RDSON (N) Pin-Pin Resistance NFET 200 m Ω TON Turn On Time Start up from Shut-down 500 µsec CIN Input Capacitor Capacitance for Stability 8 µF CO Output Capacitor Capacitance for Stability 8 µF (1) All voltages are with respect to the potential at the GND pin. (2) All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are production tested, guaranteed through statistical analysis or guaranteed by design. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (3) The input voltage range recommended for ideal applications performance for the specified output voltages is given below:VIN = 2.7V to 5.5V for 0.80V < VOUT < 1.8VVIN = (VOUT+ 1V) to 5.5V for 1.8V ≤ VOUT ≤ 3.3V (4) Test condition: for VOUT less than 2.7V, VIN = 3.6V; for VOUT greater than or equal to 2.7V, VIN = VOUT+ 1V. Buck1 Output Efficiency vs. Load Current Varied from 1mA to 1.5 Amps VIN = 3, 3.5 volts VOUT = 1.4 volts Forced PWM VIN = 4.0-4.5 volts VOUT = 1.4 volts Forced PWM Figure 8. Figure 9. 12 Submit Documentation Feedback Copyright © 2006–2011, Texas Instruments Incorporated Product Folder Links: LP3972 |
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