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LM3279 Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce LM3279
Description  LM3279 Buck-Boost Converter with MIPI RFFE Interfacefor 3G and 4G RF Power Amplifiers
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

LM3279 Fiches technique(HTML) 7 Page - Texas Instruments

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LM3279
www.ti.com
SNVS970A – MARCH 2013 – REVISED MAY 2013
SYSTEM CHARACTERISTICS
The following spec table entries are specified by design and verifications, providing the component values in the Typical
Application Circuits are used: L = 1.5 µH, DFE201610C-1R5M (2016)/TOKO; CIN and COUT each = 10 µF 6.3V,
C105A106MQ5NUNC (0402)/Samsung; PA decoupling cap emulation = 0.47 µF, GRM033R60J474ME90 (0201)/Murata.
These parameters are not verified by production testing. Limits in standard typeface are TA = 25°C. Min and Max limits in
boldface apply over the full ambient temperature range (
−30°C ≤ TA ≤ 85°C) and over the VIN range = 2.7V to 5.5V unless
otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VBATT = 3.8V, VIO = 1.8V, RFFE write VSET = 3.42V
(VSET_CTRL = 5Fh), IOUT = 0mA
Turn-on time (time for output
TON
35
50
µs
to reach 0V
→90% × 3.4V)
EN = L to H, VBATT = 3.8V, VCON = 1.14V,
IOUT = 0 mA
VBATT ≥ 3.0V, VOUT = 3.8V
750
IOUT_MAX
Max output current
mA
VBATT ≥ 3.2V, VOUT = 4.2V
650
Boost (% M4 on)
50
DMAX
Maximum duty cycle
%
Buck (% M1 on)
100
PFM: VOUT = 0.6V, PVIN = 3.7V
FOSC_PFM
Internal oscillator frequency
63
kHz
IOUT = 13 mA
Half speed readback SCLK = 13 MHz, not including
CL
Load capacitance
10
50
pF
LM3279 capacitance.
CVCON
VCON input capacitance
VCON = 1V, Test frequency = 100 kHz
10
pF
VCON_LIN
VCON linearity
0.2V
≤ VCON ≤ 1.4V
−2.5
+2.5
%
VIO
VIO I/O voltage level
1.8V Bus
1.65
1.8
1.95
V
VBATT ≥ 3.2V, 0.6 ≤ VOUT ≤ 4.2V,
Ripple voltage
15
50
0 mA
≤ IOUT ≤ 430 mA
VO_RIPPLE
PFM ripple
VOUT = 0.6V, IOUT = 5mA
40
mV
Ripple voltage in mode
VBATT = 3.0V to 5.0V, Tr = Tf = 30s
50
transition
3.3V
≤ VOUT ≤ 4.2V
VBATT = 3.2V to 4.9V, VOUT = 3.5V,
Line regulation
10
PWM Operation
ΔVOUT
mV
IOUT = 0 mA to 500 mA, VBATT = 3.2V to 4.9V,
Load regulation
20
PWM Operation
VBATT = 3.6V to 4.2V, Tr = Tf = 10 µs,
−100
+100
VOUT = 3.5V, RLOAD = 11.4Ω, PWM
Line_tr
Line transient response
mV
VBATT = 3.6V to 4.2V, Tr = Tf = 10 µs,
−5
+5
VOUT = 0.8V, RLOAD = 20Ω, PFM
IOUT = 1 mA to 200 mA, Tr = Tf = 1µs,
−100
+100
VBATT = 4.2V, VOUT = 3.5V, PWM
Load_tr
Load transient response
mV
IOUT = 10 mA to 90 mA, Tr = Tf = 1µs,
−10
+10
VBATT = 4.2V, VOUT = 0.8V, PFM
VOUT transient response
200
mV
overshoot
VBATT = 3.2V to 4.2V,
VOUT transient response rise
VOUT_TR
VOUT = 0.6V to 3.4V, Tr = Tf = 1µs,
20
time
RLOAD = 5Ω
µs
VOUT transient response fall
50
time
Copyright © 2013, Texas Instruments Incorporated
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