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| 型号： | LT1110CN8-12#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST 12V 0.4A 8DIP |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 12V |
| 输入电压： | 1 V ~ 30 V |
| 频率 - 开关： | 70kHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
| 产品目录页面： | 1325 (CN2011-ZH PDF) |
LT1110
LT1110 OPER ATI
(
)
V OUT = 220 mV ?
+ 1 ? .
? R 1
?
The LT1110 is a gated oscillator switcher. This type
architecture has very low supply current because the
switch is cycled only when the feedback pin voltage drops
below the reference voltage. Circuit operation can best be
understood by referring to the LT1110 block diagram
above. Comparator A1 compares the FB pin voltage with
the 220mV reference signal. When FB drops below
220mV, A1 switches on the 70kHz oscillator. The driver
amplifier boosts the signal level to drive the output NPN
power switch Q1. An adaptive base drive circuit senses
switch current and provides just enough base drive to
ensure switch saturation without overdriving the switch,
resulting in higher efficiency. The switch cycling action
raises the output voltage and FB pin voltage. When the FB
voltage is sufficient 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 is low the oscillator and all high current
circuitry is turned off, lowering device quiescent current to
just 300 μ A for the reference, A1 and A2.
The oscillator is set internally for 10 μ s ON time and 5 μ s
OFF time, optimizing the device for step-up circuits where
V OUT ≈ 3V IN , e.g., 1.5V to 5V. Other step-up ratios as well
as step-down (buck) converters are possible at slight
losses in maximum achievable power output.
LT1110 -5, -12 BLOCK D I AGRA
A2 is a versatile gain block that can serve as a low battery
detector, a linear post regulator, or drive an under voltage
lockout circuit. The negative input of A2 is internally
connected to the 220mV reference. An external resistor
divider from V IN to GND provides the trip point for A2. The
AO output can sink 300 μ A (use a 47k resistor pull up to
+5V). This line can signal a microcontroller that the battery
voltage has dropped below the preset level. To prevent the
gain block from operating in its linear region, a 2M ?
resistor can be connected from AO to SET. This provides
positive feedback.
A resistor connected between the I LIM pin and V IN adjusts
maximum switch current. When the switch current ex-
ceeds the set value, the switch is turned off. This feature
is especially useful when small inductance values are used
with high input voltages. If the internal current limit of 1.5A
is desired, I LIM should be tied directly to V IN . Propagation
delay through the current limit circuitry is about 700ns.
In step-up mode, SW2 is connected to ground and SW1
drives the inductor. In step-down mode, SW1 is con-
nected to V IN and SW2 drives the inductor. Output voltage
is set by the following equation in either step-up or step-
down modes where R1 is connected from FB to GND and
R2 is connected from V OUT to FB.
? R 2 ?
( 01 )
LT1110 - -5, -12 OPER ATI
V IN
SET
+
–
A2
AO
GAIN BLOCK/ERROR AMP
I LIM
SW1
The LT1110-5 and LT1110-12 fixed output voltage ver-
sions have the gain setting resistors on-chip. Only three
external components are required to construct a 5V or 12V
output converter. 16 μ A flows through R1 and R2 in the
LT1110-5, and 39 μ A flows in the LT1110-12. This current
220mV
REF
A1
COMPARATOR
OSCILLATOR
DRIVER
Q1
represents a load and the converter must cycle from time
to time to maintain the proper output voltage. Output
ripple, inherently present in gated oscillator designs, will
typically run around 90mV for the LT1110-5 and 200mV
R1
R2
300k ?
SENSE
LT1110-5: R1 = 13.8k ?
LT1110-12: R2 = 5.6k ?
SW2
for the LT1110-12 with the proper inductor/capacitor
selection. This output ripple can be reduced considerably
by using the gain block amp as a pre-amplifier in front of
GND
6
LT1110 ? BD02
the FB pin. See the Applications section for details.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1110CN8-5 | 功能描述:IC REG BUCK BOOST 5V 0.4A 8DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1110CN8-5#PBF | 功能描述:IC REG BUCK BOOST 5V 0.4A 8DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1110CS8 | 功能描述:IC REG BUCK BOOST ADJ 0.4A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1110CS8#PBF | 功能描述:IC REG BUCK BOOST ADJ 0.4A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 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:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT1110CS8#TR | 功能描述:IC REG BUCK BOOST ADJ 0.4A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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