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| 型号： | LT1765ES8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 20 V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.25MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
| 产品目录页面： | 1329 (CN2011-ZH PDF) |
LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
BLOCK DIAGRAM
The LT1765 is a constant frequency, current mode buck
converter. This means that there is an internal clock and
two feedback loops that control the duty cycle of the power
switch. In addition to the normal error ampli?er, there is a
current sense ampli?er that monitors switch current on a
cycle-by-cycle basis. A switch cycle starts with an oscillator
pulse which sets the R S ?ip-?op to turn the switch on. When
switch current reaches a level set by the inverting input of
the comparator, the ?ip-?op is reset and the switch turns
off. Output voltage control is obtained by using the output
of the error ampli?er to set the switch current trip point.
This technique means that the error ampli?er commands
current to be delivered to the output rather than voltage.
A voltage fed system will have low phase shift up to the
0.005Ω
INPUT
resonant frequency of the inductor and output capacitor,
then an abrupt 180° shift will occur. The current fed system
will have 90° phase shift at a much lower frequency, but
will not have the additional 90° shift until well beyond
the LC resonant frequency. This makes it much easier to
frequency compensate the feedback loop and also gives
much quicker transient response.
High switch ef?ciency is attained by using the BOOST pin
to provide a voltage to the switch driver which is higher
than the input voltage, allowing the switch to be saturated.
This boosted voltage is generated with an external capacitor
and diode. A comparator connected to the shutdown pin
disables the internal regulator, reducing supply current.
+
–
CURRENT
2.5V BIAS
REGULATOR
INTERNAL
V CC
SENSE
AMPLIFIER
VOLTAGE GAIN = 40
SLOPE COMP
∑
0.4V
BOOST
SYNC
1.25MHz
OSCILLATOR
+
CURRENT
COMPARATOR
S
R
R S
FLIP-FLOP
DRIVER
CIRCUITRY
Q1
POWER
SWITCH
SHUTDOWN
COMPARATOR
7μA
–
PARASITIC DIODES
DO NOT FORWARD BIAS
V SW
FB
1.33V
SHDN
3μA
INTERNAL
V CC
V C
ERROR
AMPLIFIER
g m = 850μMho
1.2V
GND
1765 F01
Figure 1. Block Diagram
1765fd
7
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相关代理商/技术参数 |
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| LT1766 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.4A, 500kHz Step-Down Switching Regulator |
| LT1766_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
| LT1766-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
| LT1766EFE | 功能描述:IC REG BUCK ADJ 1.5A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1766EFE#PBF | 功能描述:IC REG BUCK ADJ 1.5A 16TSSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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