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參數(shù)資料
| 型號： | LTC3400B |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Quadruple 2-Input Positive-OR Gate 14-TVSOP -40 to 85 |
| 中文描述： | 600毫安，1.2MHz的微功率同步升壓轉(zhuǎn)換器采用ThinSOT |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 181K |
| 代理商： | LTC3400B |
LTC3400/LTC3400B
4
3400f
PIU
SW (Pin 1):
Switch Pin. Connect inductor between SW
and V
IN
. Optional Schottky diode is connected between
SW and V
OUT
. Keep these PCB trace lengths as short and
wide as possible to reduce EMI and voltage overshoot. If
the inductor current falls to zero, or SHDN is low, an
internal 100
antiringing switch is connected from SW to
V
IN
to minimize EMI.
GND (Pin 2):
Signal and Power Ground. Provide a short
direct PCB path between GND and the (–) side of the output
capacitor(s).
FB (Pin 3):
Feedback Input to the
g
m
Error Amplifier.
Connect resistor divider tap to this pin. The output voltage
can be adjusted from 2.5V to 5V by:
V
OUT
= 1.23V [1 + (R1/R2)]
SHDN (Pin 4):
Logic Controlled
Shutdown Input.
SHDN = High: Normal free running operation, 1.2MHz
typical operating frequency.
SHDN = Low: Shutdown, quiescent current <1
μ
A.
100
connected between SW and V
IN
.
Typically, SHDN should be connected to V
IN
through a 1M
pull-up resistor.
V
OUT
(Pin 5):
Output Voltage Sense Input and Drain of the
Internal Synchronous Rectifier MOSFET. Bias is derived
from V
OUT
. PCB trace length from V
OUT
to the output filter
capacitor(s) should be as short and wide as possible. V
OUT
is held at V
IN
– 0.6V in shutdown due to the body diode of
the internal PMOS.
V
IN
(Pin 6):
Battery Input Voltage. The device gets its
start-up bias from V
IN
. Once V
OUT
exceeds V
IN
, bias
comes from V
OUT
. Thus, once started, operation is com-
pletely independent from V
IN
. Operation is only limited by
the output power level and the battery’s internal series
resistance.
1.23V
REF
Burst Mode
OPERATION
CONTROL
SHUTDOWN
CONTROL
SLOPE
COMP
PWM
CONTROL
START-UP
OSC
MUX
A
B
A/B
RAMP
GEN
1.2MHz
FB
3
3400 BD
V
OUT
5
OPTIONAL
SCHOTTKY
L1
4.7
μ
H
SW
1
V
IN
SINGLE
CELL
INPUT
6
SHDN
4
GND
2
–
+
g
ERROR
AMP
–
+
V
GOOD
–
–
+
PWM
COMPARATOR
R
C
80k
SHUTDOWN
C
150pF
C
2.5pF
R2
604k
1%
(EXTERNAL)
R1
1.02M
1%
(EXTERNAL)
SLEEP
Σ
SYNC
DRIVE
CONTROL
0.35
0.45
2.3V
C
OUT
4.7
μ
F
3.3V
OUTPUT
C
IN
1
μ
F
+
CURRENT
SENSE
BLOCK DIAGRA
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