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| 型号： | LTC1143LCS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 400kHz |
| 占空比： | 100% |
| 电源电压： | 3.5 V ~ 16 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LTC1143/LTC1143L
LTC1143L-ADJ
FU N CTIO N AL DIAGRA
Only one regulator block shown. Connections shown for LT1143/LTC1143L; changes create LTC1143L-ADJ
13(5) V IN
SENSE +
SENSE –
4(12)
P-DRIVE
1(9)
16(8)
3(11) GROUND
–
SLEEP
V
+
I TH
S
+
–
V TH2
V TH1
Q
–
+
T
R
S
C
–
+
25mV TO 150mV
– +
13k
15(7)
SHUTDOWN
G
–
+
V OS
1.25V
X
100k
5pF
14(6)
C T
OFF-TIME
CONTROL
V IN
SENSE –
(LTC1143/LTC1143L)
2(10)
V FB
X
REFERENCE
(LTC1143L-ADJ)
1143 FD
OPERATIO N
Refer to Functional Diagram and Figure 1.
The LTC1143 series consists of two individual regulator
blocks, each using current mode, constant off-time archi-
tectures to switch an external power MOSFET. The two
LTC1143/LTC1143L regulators are internally set for 3.3V
and 5V, while the two LTC1143L-ADJ regulators have
externally programmable output voltages. Operating fre-
quency is individually set on each section by external
capacitors at the timing capacitor Pins 6 and 14.
The output voltage is sensed by voltage comparator V and
gain block G, which compare the divided output voltage
with a reference voltage of 1.25V. To optimize efficiency,
the LTC1143 series automatically switches between two
modes of operation, burst and continuous. The voltage
comparator is the primary control element when the
device is in Burst Mode operation, while the gain block
controls the output voltage in continuous mode.
During the switch “ON” cycle in continuous mode, current
comparator C monitors the voltage between Pins 1 (9) and
16 (8) connected across an external shunt in series with
the inductor. When the voltage across the shunt reaches
its threshold value, the P-drive output is switched to V IN ,
turning off the P-channel MOSFET. The timing capacitor
connected to Pin 14 (6) is now allowed to discharge at a
rate determined by the off-time controller. The discharge
current is made proportional to the feedback voltage to
model the inductor current, which decays at a rate that is
also proportional to the output voltage.
When the voltage on the timing capacitor has discharged
past V TH1 , comparator T trips, setting the flip-flop. This
causes the P-drive output to go low, turning the P-channel
MOSFET back on. The cycle then repeats.
As the load current increases, the output voltage
decreases slightly. This causes the output of the gain
stage [Pin 15 (7)] to increase the current comparator
threshold, thus tracking the load current.
The sequence of events for Burst Mode operation is very
similar to continuous operation with the cycle interrupted
by the voltage comparator. When the output voltage is at
or above the desired regulated value, the P-channel
MOSFET is held off by comparator V and the timing
capacitor continues to discharge below V TH1 . When the
timing capacitor discharges past V TH2 , voltage compara-
tor S trips, causing the internal sleep line to go low.
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1144 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Noise Dual Supply |
| LTC1144C | 制造商:LINER 制造商全称:Linear Technology 功能描述:Switched-Capacitor Wide Input Range Voltage Converter with Shutdown |
| LTC1144CN8 | 功能描述:IC REG SWITCHED CAP INV 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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 |
| LTC1144CN8#PBF | 功能描述:IC REG SWITCHED CAP INV 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: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 |
| LTC1144CN8PBF | 制造商:Linear Technology 功能描述:LTC1144CN8PBF |
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