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LM3248TMENOPB Datenblatt(PDF) 8 Page - Texas Instruments |
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LM3248TMENOPB Datenblatt(HTML) 8 Page - Texas Instruments |
8 / 31 page LM3248 SNVSA01A – JULY 2013 – REVISED SEPTEMBER 2013 www.ti.com SYSTEM CHARACTERISTICS (BUCK) (continued) The following spec table entries are specified by design and verification providing the component values in the Typical Application Diagram are used: L = 1.5 µH (TOKO 1285AS-H-1R5N); CIN = 10 µF (Murata GRM155R61A106A); and COUT = 10 µF + 4.7 µF (Murata GRM155R61A106A, GRM155R61A475MEAA) + 4 x 1.0 µF (Murata GRM033R60J105M). These parameters are not verified by production testing. (1) Min and Max values are specified over the ambient temperature range TA = −30°C ≤ TA ≤ +90°C. Typical values are specified at VBATT = 3.8V and TA = 25°C unless otherwise stated. Symbol Parameter Condition Min Typ Max Units Ripple voltage at no pulse VOUT = 0.4V to 3.6V, ROUT = 2.2Ω, 4 10 skipping condition 2G mode (4) VBATT = 4.2V to dropout, Ripple voltage at pulse skipping VOUT_RIPPLE VOUT = 3.6V, ROUT = 2.2Ω, 14 20 mVpp condition 2G mode (4) VOUT = 1.0V, PFM ripple voltage 9 15 IOUT = 40 mA (4) VBATT = 3.6V to 4.2V, VLINE-TR Line transient response TR = TF = 10 µs, 70 VOUT = 1.0V, IOUT = 600 mA mVpk VOUT = 3.0V, VLOAD-TR Load transient response TR = TF = 10 µs, IOUT = 0A to 1.2A, 150 2G mode VBATT = 3.2V, VOUT = 1.0V, FSW_PFM Minimum PFM frequency 100 kHz IOUT = 10 mA (4) Ripple voltage should be measured at COUT node on a well-designed PC board, using suggested inductor and capacitors. Ripple voltage is defined as the maximum peak-to-peak output voltage variation measured over a 100 µs period. SYSTEM CHARACTERISTICS (BOOST-BUCK) See SYSTEM CHARACTERISTICS (BOOST) and SYSTEM CHARACTERISTICS (BUCK) for test conditions. Symbol Parameter Condition Min Typ Max Units VBATT = 4.0V, VOUT = 3.4V, 86 IOUT = 2A (2G, PWM mode) VBATT = 4.0V, VOUT = 2.5V, 89 IOUT = 800 mA (2G, PWM mode) VBATT = 4.0V, VOUT = 3.0V, 93 IOUT = 400 mA (2G, PWM mode) VBATT = 3.4V, VOUT = 4.0V, 90 IOUT = 850 mA (3G/4G, PWM mode) VBATT = 3.4V, VOUT = 3.0V, η Boost-Buck Efficiency 94 % IOUT = 500 mA (3G/4G, PWM mode) VBATT = 3.4V, VOUT = 2.5V, 90 IOUT = 70 mA (3G/4G, PFM mode) VBATT = 3.4V, VOUT = 0.9V, 86 IOUT = 200 mA (3G/4G, PWM mode) VBATT = 3.6V, VOUT = 3.3V, 92 IOUT = 20 mA (3G/4G PFM mode) VBATT = 3.4V, VOUT = 0.6V, 78 IOUT = 20 mA (3G/4G, PFM mode) VBATT = 2.7, 3.2V. RLOAD = 11.4Ω, Time for VOUT to rise from 0.4V VCON = 0.16V to 1.6V; Trise = Tfall = 1 µs to 4.0V (93% or 3.75V) MODE = 2G (HIGH) TRESPONSE 15 µs VBATT = 2.7, 3.2V. RLOAD = 11.4Ω, Time for VOUT to fall from 4.0V VCON = 1.6V to 0.16V; Trise = Tfall = 1 µs to 0.4V (7% or 0.65V) MODE = 2G (HIGH) 8 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: LM3248 |
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