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LMZ31503RUQR Datasheet(PDF) 4 Page - Texas Instruments |
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LMZ31503RUQR Datasheet(HTML) 4 Page - Texas Instruments |
4 / 29 page LMZ31503 SNVS992 – JULY 2013 www.ti.com ELECTRICAL CHARACTERISTICS Over -40°C to 85°C free-air temperature, PVIN = VIN = 12 V, VOUT = 1.8 V, IOUT = 3A, CIN1 = 2x 22 µF ceramic, CIN2 = 68 µF poly-tantalum, COUT1 = 4x 47 µF ceramic (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT IOUT Output current TA = 85°C, natural convection 0 3 A VIN Input bias voltage range Over IOUT range 4.5 14.5 V PVIN Input switching voltage range Over IOUT range 1.6(1) 14.5 V VIN = increasing 4.0 4.5 UVLO VIN Undervoltage lockout V VIN = decreasing 3.5 3.85 VOUT(adj) Output voltage adjust range Over IOUT range 0.8 5.5 V Set-point voltage tolerance TA = 25°C, IOUT = 0A ±1.0% (2) Temperature variation -40°C ≤ TA ≤ +85°C, IOUT = 0A ±0.3% VOUT Line regulation Over PVIN range, TA = 25°C, IOUT = 0A ±0.1% Load regulation Over IOUT range, TA = 25°C ±0.1% Total output voltage variation Includes set-point, line, load, and temperature variation ±1.5% (2) VOUT = 5V, fSW = 780kHz 91.5 % VOUT = 3.3V, fSW = 630kHz 89.0 % VOUT = 2.5V, fSW = 480kHz 86.9 % PVIN = VIN = 12 V IO = 1.5 A VOUT = 1.8V, fSW = 480kHz 85.2 % VOUT = 1.2V, fSW = 480kHz 82.1 % η Efficiency VOUT = 0.8V, fSW = 330kHz 78.7 % PVIN = VIN = 5 V VOUT = 3.3V, fSW = 630kHz 93.3 % IO = 1.5 A VOUT = 2.5V, fSW = 480kHz 91.4 % VOUT = 1.8V, fSW = 480kHz 88.8 % VOUT = 1.2V, fSW = 480kHz 85.2 % VOUT = 0.8V, fSW = 330kHz 81.8 % Output voltage ripple 20 MHz bandwith 35 mVPP ILIM Overcurrent threshold 5.8 A Recovery time 190 µs Transient response 1.0 A/µs load step from 50 to 100% IOUT(max) VOUT 35 mV over/undershoot VINH-H Inhibit High Voltage 1.30 Open (3) Inhibit Control V VINH-L Inhibit Low Voltage –0.3 1.05 INH Input current INH < 1.1 V -1.15 μA INH Hysteresis current INH > 1.26 V -3.4 μA II(stby) Input standby current INH pin to AGND 2 4 µA Good 94% VOUT rising Fault 109% PWRGD Thresholds Power Fault 91% Good VOUT falling Good 106% PWRGD Low Voltage I(PWRGD) = 2 mA 0.3 V fSW Switching frequency Over VIN and IOUT ranges, RT/CLK pin OPEN 270 330 390 kHz fCLK Synchronization frequency 330 780 kHz VCLK-H CLK High-Level Threshold 2.0 5.5 V CLK Control VCLK-L CLK Low-Level Threshold 0.8 V DCLK CLK Duty cycle 20% 80% Thermal shutdown 160 175 °C Thermal Shutdown Thermal shutdown hysteresis 10 °C (1) The minimum PVIN voltage is 1.6V or (VOUT+ 0.7V) , whichever is greater. VIN must be greater than 4.5V. (2) The stated limit of the set-point voltage tolerance includes the tolerance of both the internal voltage reference and the internal adjustment resistor. The overall output voltage tolerance will be affected by the tolerance of the external RSET resistor. (3) This control pin has an internal pullup. If this pin is left open circuit, the device operates when input power is applied. A small low- leakage (<300 nA) MOSFET is recommended for control. See the application section for further guidance. 4 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: LMZ31503 |
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