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参数资料
| 型号： | LT1107IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST INV ADJ 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 输入电压： | 2 V ~ 30 V |
| 频率 - 开关： | 63kHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 无 |
| 工作温度： | -45°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 |
LT1107
BLOCK D I AGRA S
SET
LT1107
SET
LT1107-5/LT1107-12
V IN
A2
AO
V IN
A2
AO
GAIN BLOCK/
ERROR AMP
I LIM
SW1
GAIN BLOCK/
ERROR AMP
I LIM
SW1
1.25V
REFERENCE
1.25V
REFERENCE
A1
COMPARATOR
OSCILLATOR
DRIVER
A1
COMPARATOR
OSCILLATOR
DRIVER
GND
FB
SW2
1107 BD01
GND
R1
R2
220k
SENSE
LT1107-5: R1 = 73.5k
LT1107-12: R1 = 25.5k
SW2
1107 BD02
OPERATIO
The LT1107 is a gated oscillator switcher. This type
architecture has very low supply current because the
switch is cycled when the feedback pin voltage drops
below the reference voltage. Circuit operation can best be
understood by referring to the LT1107 block diagram.
Comparator A1 compares the feedback (FB) pin voltage
with the 1.25V reference signal. When FB drops below
1.25V, A1 switches on the 63kHz oscillator. The driver
amplifier boosts the signal level to drive the output NPN
power switch. The switch cycling action raises the output
voltage and FB pin voltage. When the FB voltage is suffi-
cient to trip A1, the oscillator is gated off. A small amount
of hysteresis built into A1 ensures loop stability without
external frequency compensation. When the comparator
output is low, the oscillator and all high current circuitry is
turned off, lowering device quiescent current to just 300 μ A.
The oscillator is set internally for 11 μ s ON time and 5 μ s
OFF time in step-up mode, optimizing the device for
converters where V OUT ≈ 3V IN . The combination of high
duty cycle and the current limit feature enables continuous
mode operation in many applications, increasing available
output power.
Gain block A2 can serve as a low-battery detector. The
negative input of A2 is the 1.25V reference. A resistor
divider from V IN to GND, with the mid-point connected to
the SET pin provides the trip voltage in a low-battery
detector application. AO can sink 300 μ A (use a 22k
resistor pull-up to 5V).
A resistor connected between the I LIM pin and V IN sets
maximum switch current. When the switch current ex-
ceeds the set value, the switch cycle is prematurely
terminated. If current limit is not used, I LIM should be tied
directly to V IN . Propagation delay through the current limit
circuitry is approximately 1 μ s.
In step-up mode the switch emitter (SW2) is connected to
ground and the switch collector (SW1) drives the induc-
tor; in step-down mode the collector is connected to V IN
and the emitter drives the inductor.
The LT1107-5 and LT1107-12 are functionally identical to
the LT1107. The -5 and -12 versions have on-chip voltage
setting resistors for fixed 5V or 12V outputs. Pin 8 on the
fixed versions should be connected to the output. No
external resistors are needed.
1107fa
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1107M | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V |
| LT1107MJ8 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2V to 30V 8-Pin CDIP |
| LT1107MJ8-12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V |
| LT1107MJ8-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V |
| LT1108 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V |
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