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| 型号： | LTC3406ES5-1.8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V TSOT23-5 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.8V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
LTC3406
LTC3406-1.5/LTC3406-1.8
OPERATIO
(Refer to Functional Diagram)
Short-Circuit Protection
When the output is shorted to ground, the frequency of the
oscillator is reduced to about 210kHz, 1/7 the nominal
frequency. This frequency foldback ensures that the in-
ductor current has more time to decay, thereby preventing
runaway. The oscillator’s frequency will progressively
increase to 1.5MHz when V FB or V OUT rises above 0V.
Dropout Operation
As the input supply voltage decreases to a value approach-
ing the output voltage, the duty cycle increases toward the
maximum on-time. Further reduction of the supply voltage
forces the main switch to remain on for more than one cycle
until it reaches 100% duty cycle. The output voltage will then
be determined by the input voltage minus the voltage drop
across the P-channel MOSFET and the inductor.
An important detail to remember is that at low input supply
in the maximum output current as a function of input
voltage for various output voltages.
Slope Compensation and Inductor Peak Current
Slope compensation provides stability in constant fre-
quency architectures by preventing subharmonic oscilla-
tions at high duty cycles. It is accomplished internally by
adding a compensating ramp to the inductor current
signal at duty cycles in excess of 40%. Normally, this
results in a reduction of maximum inductor peak current
for duty cycles > 40%. However, the LTC3406 uses a
patent-pending scheme that counteracts this compensat-
ing ramp, which allows the maximum inductor peak
current to remain unaffected throughout all duty cycles.
1200
1000
voltages, the R DS(ON) of the P-channel switch increases
(see Typical Performance Characteristics). Therefore, the
user should calculate the power dissipation when the
800
600
V OUT = 1.8V
V OUT = 1.5V
V OUT = 2.5V
LTC3406 is used at 100% duty cycle with low input voltage
(See Thermal Considerations in the Applications Informa-
tion section).
400
200
Low Supply Operation
0
2.5
3.0
3.5 4.0 4.5
5.0
5.5
The LTC3406 will operate with input supply voltages as
low as 2.5V, but the maximum allowable output current is
SUPPLY VOLTAGE (V)
3406 F02
reduced at this low voltage. Figure 2 shows the reduction
Figure 2. Maximum Output Current vs Input Voltage
3406fa
7
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相关代理商/技术参数 |
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|---|---|
| LTC3406ES5TRMPBF | 制造商:Linear Technology 功能描述:LTC3406 adj 600mA SD dc-dc converter |
| LTC3407 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Regulator |
| LTC3407-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking 3A Step-Down Switching |
| LTC3407-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator |
| LTC3407-4 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator |
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