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参数资料
| 型号： | LTC3400ES6-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC ADJ .85A SOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 5 V |
| 输入电压： | 0.5 V ~ 6 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 850mA |
| 同步整流器： | 是 |
| 工作温度： | -30°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC3400/LTC3400B
PI FU CTIO S
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 = 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.
SHDN = High: Normal free running operation, 1.2MHz
typical operating frequency.
BLOCK DIAGRA
L1
4.7 μ H
+
SINGLE
CELL
INPUT
6 V IN
C IN
1 μ F
1 SW
OPTIONAL
SCHOTTKY
V OUT
GOOD
START-UP
OSC
A
B
A/B
MUX
2.3V
0.45 ?
V OUT
5
3.3V
OUTPUT
PWM
CONTROL
SYNC
DRIVE
CONTROL
0.35 ?
R1
RAMP
GEN
1.2MHz
SLOPE
COMP
Σ
CURRENT
SENSE
C FF
(OPTIONAL)
1.02M
1%
(EXTERNAL)
PWM
COMPARATOR
FB
g m
ERROR
3
C OUT
4.7 μ F
SLEEP
Burst Mode
OPERATION
CONTROL
R C
80k
C C
150pF
C P2
2.5pF
AMP
1.23V
REF
R2
604k
1%
(EXTERNAL)
SHDN
4
SHUTDOWN
CONTROL
SHUTDOWN
2 GND
3400 BD
3400fa
4
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