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参数资料
| 型号： | LTC3400ES6-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12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
OPERATIO
burst threshold, the LTC3400 will resume continuous
PWM operation seamlessly. Referring to the Block Dia-
gram, an optional capacitor (C FF ) between V OUT and FB in
some circumstances can reduce the peak-to-peak V OUT
ripple and input quiescent current during Burst Mode
APPLICATIO S I FOR ATIO
PCB LAYOUT GUIDELINES
The high speed operation of the LTC3400/LTC3400B
demands careful attention to board layout. You will not get
advertised performance with careless layout. Figure 2
shows the recommended component placement. A large
ground pin copper area will help to lower the chip tempera-
ture. A multilayer board with a separate ground plane is
ideal, but not absolutely necessary.
operation. Typical values for C FF range from 15pF to
220pF. The LTC3400B does not use Burst Mode operation
and features continous operation at light loads, eliminat-
ing low frequency output voltage ripple at the expense of
light load efficiency.
of inductance will allow greater output current capability
by reducing the inductor ripple current. Increasing the
inductance above 10 μ H will increase size while providing
little improvement in output current capability.
The approximate output current capability of the LTC3400/
LTC3400B versus inductance value is given in the equa-
tion below and illustrated graphically in Figure 3.
180
V IN =1.2V
V OUT = 3V
(OPTIONAL)
160
V OUT = 3.3V
V OUT = 3.6V
140
V IN
1
SW
V IN 6
120
2
GND V OUT 5
V OUT = 5V
3
FB SHDN 4
SHDN
110
80
V OUT
60
3
5
7
9
11 13 15 17 19 21 23
INDUCTANCE ( μ H)
? ? ( 1 – D )
I OUT ( MAX ) = η ? ? I P – IN
3400 F02
RECOMMENDED COMPONENT PLACEMENT. TRACES
CARRYING HIGH CURRENT ARE DIRECT. TRACE AREA AT
FB PIN IS SMALL. LEAD LENGTH TO BATTERY IS SHORT
Figure 2. Recommended Component Placement
for Single Layer Board
COMPONENT SELECTION
Inductor Selection
The LTC3400/LTC3400B can utilize small surface mount
and chip inductors due to their fast 1.2MHz switching
frequency. A minimum inductance value of 3.3 μ H is
necessary for 3.6V and lower voltage applications and
4.7 μ H for output voltages greater than 3.6V. Larger values
3400 F03
Figure 3. Maximum Output Current vs
Inductance Based On 90% Efficiency
? V ? D ?
? f ? L ? 2 ?
where:
η = estimated efficiency
I P = peak current limit value (0.6A)
V IN = input (battery) voltage
D = steady-state duty ratio = (V OUT – V IN )/V OUT
f = switching frequency (1.2MHz typical)
L = inductance value
3400fa
6
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