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参数资料
| 型号： | LTC1622CMS8 |
| 厂商： | Linear Technology |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 8-MSOP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 625kHz |
| 占空比： | 100% |
| 电源电压： | 2 V ~ 10 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1333 (CN2011-ZH PDF) |
LTC1622
FU N CTIO N AL DIAGRA
V IN
Y = “0” ONLY WHEN X IS A CONSTANT “1”
V CC
1 μ A
BURST DEFEAT
X
Y
OTHERWISE Y = “1”
SLOPE
SYNC/
MODE
5
OSC
COMP
0.36V
0.3V
–
V FB 3
V REF
0.8V
+
V IN
0.8V
REFERENCE
FREQ
SHIFT
V IN
RUN/SS 4
0.8V
V REF
2.5 μ A
–
+
+
EA
–
g m = 0.5m
RUN/
SOFT-START
0.12V
2
I TH
EN
–
+
BURST
S
R Q
R S1
SENSE – 1 8
SLEEP
+ –
ICOMP
SWITCHING
LOGIC
AND
CIRCUIT
BLANKING V IN
V IN
PDRV
UVLO
TRIP = 1.97V
+
7
6
V REF + 0.12V
OV
–
SHUTDOWN
GND
1622 BD
OPERATIO
Main Control Loop
(Refer to Functional Diagram)
current source to charge up the soft-start capacitor C SS .
The LTC1622 is a constant frequency current mode switch-
ing regulator. During normal operation, the external
P-channel power MOSFET is turned on each cycle when
the oscillator sets the R S latch (R S1 ) and turned off when
the current comparator (I COMP ) resets the latch. The peak
inductor current at which I COMP resets the R S latch is
controlled by the voltage on the I TH pin, which is the output
of the error amplifier EA. An external resistive divider
connected between V OUT and ground allows EA to receive
an output feedback voltage V FB . When the load current
increases, it causes a slight decrease in V FB relative to the
0.8V reference, which in turn causes the I TH voltage to
increase until the average inductor current matches the
new load current.
The main control loop is shut down by pulling the RUN/SS
pin low. Releasing RUN/SS allows an internal 2.5 μ A
When C SS reaches 0.7V, the main control loop is enabled
with the I TH voltage clamped at approximately 5% of its
maximum value. As C SS continues to charge, I TH is gradu-
ally released allowing normal operation to resume.
Comparator OV guards against transient overshoots
> 16% by turning off the P-channel power MOSFET and
keeping it off until the fault is removed.
Burst Mode Operation
The LTC1622 can be enabled to go into Burst Mode
operation at low load currents simply by leaving the SYNC/
MODE pin open or connecting it to a voltage of at least 2V.
In this mode, the peak current of the inductor is set as if
V ITH = 0.36V (at low duty cycles) even though the voltage
at the I TH pin is at lower value. If the inductor’s average
current is greater than the load requirement, the voltage at
5
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| LTC1622CMS8#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC1622CMS8#TR | 功能描述:IC REG CTRLR BUCK PWM CM 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1622CMS8#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1622CS8 | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1622CS8#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
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