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| 型号： | LTC3619BIMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 10MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 400mA，800mA |
| 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： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LTC3619B
Programmable Average Input Current Limit:
Dual Step-Down Outputs: Up to 96% Efficiency
Low Noise Pulse-Skipping Operation at Light Loads
Input Voltage Range: 2.5V to 5.5V
Output Voltage Range: 0.6V to 5V
2.25MHz Constant-Frequency Operation
Power Good Output Voltage Monitor for Each Channel
Low Dropout Operation: 100% Duty Cycle
Independent Internal Soft-Start for Each Channel
Current Mode Operation for Excellent Line and Load
±2% Output Voltage Accuracy
Short-Circuit Protected
Shutdown Current ≤ 1μA
Available in Small Thermally Enhanced 10-Lead MS
High Peak Load Current Applications
USB Powered Devices
Supercapacitor Charging
Radio Transmitters and Other Handheld Devices
FEATURES
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±5% Accuracy
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Transient Response
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and 3mm × 3mm DFN Packages
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5481178, 6127815,
6304066, 6498466, 6580258, 6611131.
TYPICAL APPLICATION
Dual Monolithic Buck Regulator in 10-Lead 3mm × 3mm DFN
400mA/800mA Synchronous
Step-Down DC/DC with
Average Input Current Limit
DESCRIPTION
The LTC ? 3619B is a dual monolithic synchronous buck
regulator using a constant frequency current mode ar-
chitecture.
The input supply voltage range is 2.5V to 5.5V, making it
ideal for Li-Ion and USB powered applications. 100% duty
cycle capability provides low dropout operation, extend-
ing the run time in battery-operated systems. Low output
voltages are supported with the 0.6V feedback reference
voltage. Channel 1 and channel 2 can supply 400mA and
800mA output current, respectively.
The LTC3619B’s programmable average input current limit
is ideal for USB applications and for point-of-load power
supplies because the LTC3619B’s limited input current
will still allow its output to deliver high peak load currents
without collapsing the input supply. When the sum of
both channels’ currents exceeds the input current limit,
channel 2 is current limited while channel 1 remains regu-
lated. The operating frequency is internally set at 2.25MHz
allowing the use of small surface mount inductors. Internal
soft-start reduces in-rush current during start-up. The
LTC3619B is available in small MSOP and 3mm × 3mm
DFN packages. The LTC3619B is also available in a low
quiescent current, high efficiency Burst Mode ? version,
LTC3619.
GSM Pulse Load
V IN
3.4V TO 5.5V
10μF
RUN2 V IN RUN1
V OUT
200mV/DIV
255k
1ms/DIV
V OUT2
3.4V AT
800mA
+
2.2mF
× 2
SuperCap
1190k
1.5μH
255k
PGOOD2 PGOOD1
LTC3619B
SW2 SW1
V FB2 V FB1
RLIM GND
1000pF 116k
3.3μH
22pF
511k
V OUT1
1.8V AT
400mA
10μF
3619B TA01
V IN
AC-COUPLED
1V/DIV
I OUT
500mA/DIV
I IN
500mA/DIV
3619B TA01b
V IN = 5V, 500mA COMPLIANT
I LOAD = 0A to 2.2A, CHANNEL 1 UNLOADED
I LIM = 475mA
3619bfb
1
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相关代理商/技术参数 |
参数描述 |
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| LTC3619EDD#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 10DFN 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 |
| LTC3619EDD#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN DC/DC CONVERTER DFN-10 |
| LTC3619EDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ DL 10DFN 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: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 |
| LTC3619EMSE#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 10MSOP 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: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 |
| LTC3619EMSE#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN DC/DC CONVERTER MSOP10 |
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