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LM3248TMENOPB Datenblatt(PDF) 8 Page - Texas Instruments

Teilenummer LM3248TMENOPB
Bauteilbeschribung  LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM3248TMENOPB Datenblatt(HTML) 8 Page - Texas Instruments

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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
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