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LM3242 데이터시트(HTML) 4 Page - Texas Instruments

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부품명 LM3242
상세내용  6MHz, 750mA Miniature, Adjustable, Step-Down DC-DC Converter with Auto Bypass for RF Power Amplifiers
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제조사  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM3242 데이터시트(HTML) 4 Page - Texas Instruments

 
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LM3242
SNOSB48D – OCTOBER 2011 – REVISED MARCH 2013
www.ti.com
Electrical Characteristics
Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature
range (
−30°C ≤ TA = TJ ≤ +90°C). Unless otherwise noted, all specifications apply to the Typical Application Circuit (page 1)
with VIN = EN = 3.6V, and BPEN = NC = 0V.
Symbol
Parameter
Condition
Min
Typ
Max
Units
VFB,MIN
Feedback voltage at
PWM mode, VCON = 0.16V (1)
0.38
0.4
0.42
V
minimum setting
VFB,MAX
Feedback voltage at
PWM mode, VCON = 1.44V, VIN = 4.0V
3.55
3.6
3.65
V
maximum setting
ISHDN
Shutdown supply current
EN = SW = VCON = FB = BPEN = NC =
0.1
1.0
µA
0V (2)
IQ_PWM
PWM mode quiescent
PWM mode, No switching
650
795
µA
current
VCON = 0.13V, FB = 1V (3)
EN = VIN, BPEN = NC = 0V, SW =
µA
IQ_SLEEP
Low-power SLEEP mode
TriState
60
80
VCON < 0.08V (4)
IQ_ECO
ECO mode Quiescent
ECO mode, No switching
60
80
µA
current
VCON = 0.8V, FB = 2.05V (3)
RDSON (P)
Pin-pin resistance for PFET
VIN = VGS = 3.6V, ISW = 200 mA
170
260
m
RDSON (N)
Pin-pin resistance for NFET VIN = VGS = 3.6V, ISW = −200 mA
110
200
m
Pin-Pin resistance for
RDSON (BP)
VIN = VGS = 3.1V, ISW = −200 mA
80
110
m
BPFET
ILIM P
PFET switch peak current
(5)
1300
1450
1600
mA
limit
BPFET switch peak current
ILIM BP
VFB = VIN − 1V
(5)
310
400
mA
limit
FOSC
Internal oscillator frequency
5.7
6
6.3
MHz
VIH
EN, BPEN Logic high input
1.2
V
threshold
VIL
EN, BPEN Logic low input
0.4
V
threshold
Gain
VCON to VOUT gain
0.16V
≤ VCON ≤ 1.44V (6)
2.5
V/V
IVCON
VCON pin leakage current
VCON = 1.0V
±1
µA
Auto Bypass Detection
VCON = 1.2V (VOUT-SET = 3.0V)
VBP,NEG
165
200
235
mV
Negative Threshold
VIN = 3.2V, RL = 6Ω (IOUT = 500 mA)
(7)
Auto Bypass Detection
VCON = 1.2V (VOUT-SET = 3.0V)
VBP,POS
215
250
285
Positive Threshold
VIN = 3.25V, RL = 6Ω (IOUT = 500 mA)
(8)
Auto Bypass IOUT Slew
IBP,SLEW
BPEN = High, Forced Bypass
1600
mA
Current
(1)
All 0.4V VOUT specifications are at steady-state only.
(2)
Shutdown current includes leakage current of PFET.
(3)
Iq specified here is when the part is not switching under test mode conditions. For operating quiescent current at no load, refer to
datasheet curves.
(4)
FB has 200 k
Ω to SGND.
(5)
Current limit is built-in, fixed, and not adjustable.
(6)
Care should be taken to keep the VCON pin voltage less than the VIN pin voltage as this can place the part into a manufacturing test
mode.
(7)
Entering Bypass Mode VIN is compared to the programmed output voltage (2.5 × VCON). When VIN − (2.5 × VCON) falls below VBP,NEG
longer than TBP,NEG, the Bypass FET turns on, and the switching FET turns on.
(8)
Bypass Mode is exited when VIN − (2.5 × VCON) exceeds VBP,POS longer than TBP,POS, and PWM mode resumes. The hysteresis for
the bypass detection threshold VBP,POS-VBP,NEG will always be positive and will be approximately 50 mV.
4
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