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| 型号： | LTC1265CS-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.2A 14SOIC |
| 标准包装： | 55 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 3.5 V ~ 12 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 最高 700kHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 14-SOIC |
LTC1265/LTC1265-3.3/LTC1265-5
APPLICATIO S I FOR ATIO
The output, Pin 3, is an N-channel open drain that goes low
when the battery voltage is below the threshold set by R3
and R4. In shutdown, the comparator is disabled and Pin
3 is in a high impedance state.
V IN
Absolute Maximum Ratings and Latchup Prevention
The absolute maximum ratings specify that SW (Pin 14)
can never exceed V IN (Pins 1, 2, 13) by more than 0.3V.
Normally this situation should never occur. It could,
however, if the output is held up while the V IN supply is
pulled down. A condition where this could potentially
R4
4
R3
–
+
LTC1265
3
occur is when a battery is supplying power to an LTC1265
regulator and also to one or more loads in parallel with the
the regulator’s V IN . If the battery is disconnected while the
LTC1265 regulator is supplying a light load and one of the
parallel circuits has a heavy load, the input capacitor of the
) )
V OUT = 1.25 1 +
1.25V REFERENCE
LTC1265 F03
Figure 3. Low-Battery Comparator
LTC1265 ADJUSTABLE APPLICATIONS
The LTC1265 develops a 1.25V reference voltage between
the feedback (Pin 9) terminal and signal ground (see
Figure 4). By selecting resistor R1, a constant current is
caused to flow through R1 and R2 to set overall output
voltage. The regulated output voltage is determined by:
R2
R1
For most applications a 30k resistor is suggested for R1.
To prevent stray pickup, a 100pF capacitor is suggested
across R1 located close to the LTC1265.
V OUT
R2
LTC1265 regulator could be pulled down faster than the
output capacitor, causing the absolute maximum ratings
to be exceeded. The result is often a latchup which can be
destructive if V IN is reapplied quickly. Battery disconnect
is possible as a result of mechanical stress, bad battery
contacts or use of a lithium-ion battery with a built-in
internal disconnect. The user needs to assess his/her
application to determine whether this situation could
occur. If so, additional protection is necessary.
Prevention against latchup can be accomplished by
simply connecting a Schottky diode across the SW and
V IN pins as shown in Figure 5. The diode will normally be
reverse biased unless V IN is pulled below V OUT at which
time the diode will clamp the (V OUT – V IN ) potential to less
than the 0.6V required for latchup. Note that a low leakage
Schottky should be used to minimize the effect on no-
load supply current. Schottky diodes such as MBR0530,
BAS85 and BAT84 work well. Another more serious
effect of the protection diode leakage is that at no load
with nothing to provide a sink for this leakage current, the
LATCHUP
PROTECTION
SCHOTTKY
LTC1265 V FB
9
SGND
11
100pF
R1
PWR
V IN
SW
+
V OUT
LTC1265
LTC1265 F04
1265 F05
Figure 4. LTC1265 Adjustable Configuration
Figure 5. Preventing Absolute Maximum
Ratings from Being Exceeded
9
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