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LM3279 데이터시트(PDF) 6 Page - Texas Instruments

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부품명 LM3279
상세설명  LM3279 Buck-Boost Converter with MIPI RFFE Interfacefor 3G and 4G RF Power Amplifiers
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LM3279
SNVS970A – MARCH 2013 – REVISED MAY 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
(1)
Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature
range (
−30°C ≤ TJ = TA ≤ +85°C). Unless otherwise noted, specifications apply to the LM3279 Typical Application Circuits
with: PVIN = 3.8V, VIO or EN = 1.8V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VSET = 0Bh
0.35
0.40
0.45
VFB,MIN
Minimum FB voltage
VCON = 0.167V
0.43
0.5
0.570
V
VSET = 75h
4.122
4.212
4.302
VFB,MAX
Maximum FB voltage
VCON = 1.4V
4.11
4.2
4.29
IQ_PWM
DC bias current in PVIN, SVIN
No switching (2) FB = HIGH
1.4
2.0
mA
VIO = EN = 0V, VCON = 0V,
ISHDN
Shutdown supply current
0.2
2.0
µA
SW1 = SW2 = VOUT = 0V
VIO = 1.8V, VSET_CTRL = 02h,
IQ STBY
Standby supply current
1.2
mA
SW1 = SW2 = VOUT = 0V
ILIM_L
Input current limit (large)
Open Loop (3) VCON = 1.2V
1500
1700
mA
ILIM_S
Input current limit (small)
Open Loop (3) VCON = 0.2V
700
850
FOSC_PWM
Internal oscillator frequency
PWM
2.1
2.4
2.7
MHz
fSCLK
SCLK clock frequency
0.032
26
IVIO-IN
VIO voltage average input current
VIO = 1.8V, Average during 26 MHz write
1.25
mA
ISDATA
−2
1
IIL
VIN = 0.2*VIO
ISCLK
−1
1
µA
ISDATA
−2
10
IIH
VIN = 0.8*VIO
ISCLK
−1
10
Input high-level threshold EN, GPO0,
VIH
1.2
GPO1
V
Input low-level threshold EN, GPO0,
VIL
0.6
GPO1
VIH-SDATA,
Input high-level threshold SDATA,
0.4*VIO
0.7*VIO
SCLK
SCLK
VIL-SDATA,
Input low-level threshold SDATA,
0.3*VIO
0.6*VIO
SCLK
SCLK
V
VOH-SDATA
Output high-level threshold SDATA
ISDATA = −2mA
0.8*VIO
VIO + 0.01
VOL-SDATA
Output low-level threshold SDATA
ISDATA = 2 mA
0.2*VIO
VOH-GPO
Output high-level threshold GPO
IOUT = ±200 µA
VIO
−0.15V
VIO+0.1V
VOL-GPO
Output low-level threshold GPO
IOUT = ±200 µA
−0.4
0.3
V
VSET-LSB
Output voltage LSB
VSET_CTRL = 40h to 41h
36
mV
IEN
EN pin pulldown current
VIO = 0V
5
10
µA
Gain
Internal gain (4)
0.2V
≤ VCON ≤ 1.4V
3
V/V
ICON
VCON pin input leakage
EN = 3.8V
-1
+1
µA
Leakage into VOUT pin of the buck-
IOUT_LEAKAGE
EN = 0, VOUT ≤ 4.2V, VBATT ≤ 5.5V
5
boost
(1)
Min and Max limits are specified by design, test, or statistical analysis.
(2)
IQ specified here is when the part is not switching.
(3)
The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = 3.8V. For performance over the
input voltage range and closed loop results refer to the datasheet curves.
(4)
When using analog control (EN = HIGH) to calculate VOUT, use the following equation: VOUT = VCON × 3.
6
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