Texas Instruments LM3242 6MHz, 750mA Miniature, Adjustable, Step-Down DC-DC EVM LM3242TM-EV/NOPB LM3242TM-EV/NOPB 데이터 시트
제품 코드
LM3242TM-EV/NOPB
SNOSB48D – OCTOBER 2011 – REVISED MARCH 2013
Electrical Characteristics
Limits in standard typeface are for T
A
= T
J
= 25°C. Limits in boldface type apply over the full operating ambient temperature
range (
−
30°C
≤
T
A
= T
J
≤
+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
V
FB,MIN
Feedback voltage at
PWM mode, VCON = 0.16V
(1)
0.38
0.4
0.42
V
minimum setting
V
FB,MAX
Feedback voltage at
PWM mode, VCON = 1.44V, V
IN
= 4.0V
3.55
3.6
3.65
V
maximum setting
I
SHDN
Shutdown supply current
EN = SW = VCON = FB = BPEN = NC =
0.1
1.0
µA
0V
(2)
I
Q
_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
I
Q
_SLEEP
Low-power SLEEP mode
TriState
60
80
VCON < 0.08V
(4)
I
Q
_ECO
ECO mode Quiescent
ECO mode, No switching
60
80
µA
current
VCON = 0.8V, FB = 2.05V
(3)
R
DSON (P)
Pin-pin resistance for PFET
V
IN
= V
GS
= 3.6V, I
SW
= 200 mA
170
260
m
Ω
R
DSON (N)
Pin-pin resistance for NFET VIN = V
GS
= 3.6V, I
SW
=
−
200 mA
110
200
m
Ω
Pin-Pin resistance for
R
DSON (BP)
V
IN
= V
GS
= 3.1V, I
SW
=
−
200 mA
80
110
m
Ω
BPFET
I
LIM P
PFET switch peak current
(5)
1300
1450
1600
mA
limit
BPFET switch peak current
I
LIM BP
V
FB
= V
IN
−
1V
(5)
310
400
mA
limit
F
OSC
Internal oscillator frequency
5.7
6
6.3
MHz
V
IH
EN, BPEN Logic high input
1.2
V
threshold
V
IL
EN, BPEN Logic low input
0.4
V
threshold
Gain
VCON to V
OUT
gain
0.16V
≤
VCON
≤
1.44V
(6)
2.5
V/V
I
VCON
VCON pin leakage current
VCON = 1.0V
±1
µA
Auto Bypass Detection
VCON = 1.2V (V
OUT-SET
= 3.0V)
V
BP,NEG
165
200
235
mV
Negative Threshold
V
IN
= 3.2V, R
L
= 6
Ω
(I
OUT
= 500 mA)
(7)
Auto Bypass Detection
VCON = 1.2V (V
OUT-SET
= 3.0V)
V
BP,POS
215
250
285
Positive Threshold
V
IN
= 3.25V, R
L
= 6
Ω
(I
OUT
= 500 mA)
(8)
Auto Bypass I
OUT
Slew
I
BP,SLEW
BPEN = High, Forced Bypass
1600
mA
Current
(1)
All 0.4V V
OUT
specifications are at steady-state only.
(2)
Shutdown current includes leakage current of PFET.
(3)
I
q
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.
mode.
(7)
Entering Bypass Mode V
IN
is compared to the programmed output voltage (2.5 × VCON). When V
IN
−
(2.5 × VCON) falls below V
BP,NEG
longer than T
BP,NEG
, the Bypass FET turns on, and the switching FET turns on.
(8)
Bypass Mode is exited when V
IN
−
(2.5 × VCON) exceeds V
BP,POS
longer than T
BP,POS
, and PWM mode resumes. The hysteresis for
the bypass detection threshold V
BP,POS
-V
BP,NEG
will always be positive and will be approximately 50 mV.
4
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