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| 型号： | LT1306ES8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 5V 1A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 1.8 V ~ 7 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 310kHz |
| 电流 - 输出： | 1A |
| 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1306
OPERATIO
In boost operation, X5 drives the rectifier Q2 into satura-
tion. The voltage across the rectifier is V CESAT . As the
inductor current decreases, Q2’s base drive also de-
creases. X5 ceases supplying base current to Q2 when the
inductor current falls to zero.
If V IN > V O , Q2 will no longer be driven into saturation.
Instead the voltage across Q2 is allowed to increase so that
the inductor voltage reverses polarity as Q1 switches.
Since the inductor voltage is bipolar, volt-second balance
can be maintained regardless of the input voltage. The
LT1306 is therefore capable of operating as a step-down
regulator with the basic boost topology. Input
start-up current is also well controlled since the inductor
current cannot increase during Q1’s off-time with negative
inductor voltage.
The rectifier voltage drop depends on both the input and
the output voltages. Efficiency in the step-down mode is
less than that of a linear regulator. For sustained step-
down operation, the maximum output current will be
limited by the package thermal characteristics.
MODE
BOOST
STEPDOWN
1306 F03
A hysteretic comparator in driver X5 controls the mode
of operation. DC transfer characteristics of the compara-
tor are shown in Figure 3 and Figure 4.
A logic low at the S/S pin (Pin 8) initiates shutdown. First,
all circuit blocks in the LT1306 are switched off. The
synchronous rectifier Q2 and its driver are kept on to
allow stored inductive energy to flow to the output. As V O
drops below V IN , the voltage across the rectifier Q2
increases so that the inductor voltage reverses. Inductor
current continues to fall to zero. Driver X5 then turns off
and the rectifier, Q2, becomes an open circuit. The
LT1306 dissipates only 9 μ A in shutdown.
The LT1306 is guaranteed to start with a minimum V IN of
1.8V. Comparator A5 senses the input voltage and gen-
erates an undervoltage lockout (UVLO) signal if V IN falls
below this minimum. In UVLO, V C is pulled low and Q1
stops switching. The LT1306 draws 160 μ A from the
input.
MODE
BOOST
STEPDOWN
1306 F04
0
V IN – 0.1V V IN
V O
V O
V O + 0.1V
V IN
Figure 3. DC Transfer Characteristics of the Mode Control
Comparator Plotted with V O as an Independent Variable.
V IN is Considered Fixed.
8
Figure 4. DC Transfer Characteristics of the Mode Control
Comparator Plotted with V IN as an Independent Variable.
V O is Considered Fixed.
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