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参数资料
| 型号： | LTC1911EMS8-1.5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 1.5V 0.25A 8MSOP |
| 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： | 1.5V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 250mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
| 其它名称： | LTC1911EMS8-1.5TR LTC1911EMS81.5TR |
LTC1911-1.5/LTC1911-1.8
APPLICATIO S I FOR ATIO
4.7nF capacitor on SS/SHDN results in a 3ms ramp time
from 0.6V to 1.9V on the pin. If C OUT is 10 μ F, the 3ms V REF
ramp time results in an average C OUT charge current of
only 6mA (see Figure 2).
Low Current Burst Mode Operation
To improve efficiency at low output currents, a Burst Mode
function was included in the design of the LTC1911. An
output current sense circuit is used to detect when the
ON OFF V CTRL
V OUT
LTC1911
8
SS/SHDN
C SS
6
C OUT
R LOAD
required output current drops below 30mA typ. When this
occurs, the oscillator shuts down and the part goes into a
low current operating state. The LTC1911 will remain in
the low current operating state until V OUT has dropped
enough to require another burst of current. Unlike tradi-
tional charge pumps who’s burst current is dependant on
many factors (i.e., supply, switch strength, capacitor
V CTRL
(2a)
selection, etc.), the LTC1911 burst current is set by the
burst threshold. This means that the output ripple voltage
during Burst Mode operaton will be fixed and is typically
5mV for C OUT = 10 μ F.
2V/DIV
Short-Circuit/Thermal Protection
The LTC1911 has built-in short-circuit current limiting as
well as overtemperature protection. During short-circuit
V OUT
1V/DIV
conditions it will automatically limit its output current to
approximately 600mA. The LTC1911 will shut down if the
junction temperature exceeds approximately 160 ° C. Un-
C SS = 0nF
C OUT = 10 μ F
R LOAD = 10 ?
2ms/DIV
(2b)
1911 F02b
der normal operating conditions, the LTC1911 should not
go into thermal shutdown but it is included to protect the
IC in cases of excessively high ambient temperatures, or
in cases of excessive power dissipation inside the IC (i.e.,
overcurrent or short circuit). The charge transfer will
V CTRL
2V/DIV
V OUT
1V/DIV
reactivate once the junction temperature drops back to
approximately 150 ° C. The LTC1911 can cycle in and out
of thermal shutdown indefinitely without latch-up or
damage until the fault condition is removed.
V OUT Ripple and Capacitor Selection
The type and value of capacitors used with the
LTC1911 determine several important parameters such
C SS = 4.7nF
C OUT = 10 μ F
R OUT = 10 ?
2ms/DIV
1911 F02c
as regulator control loop stability, output ripple and
charge pump strength.
(2c)
Figure 2. Shutdown/Soft-Start Operation
The value of C OUT directly controls the amount of output
ripple for a given load current. Increasing the size of C OUT
will reduce the output ripple.
1911f
8
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