Analog Devices Inc. LTC36xx/LTC7149系列降压稳压器

Linear Technology/Analog Devices LTC36xx/LTC7149系列同步降压稳压器效率高，采用单片结构，性能出众，适用于反相输出应用。LTC3623和LTC3600使用单个外部电阻器进行编程。LTC3649和LTC7149具有单电阻器可编程输出电压，在V_OUT宽范围内具有高效率。

LTC7149采用一个反相稳压器，其工作输入电压范围为3.4V至60V。LTC3649的输入电压范围为3.1V至60V。LTC3623和LTC3600的工作电压范围为4V至15V。

LTC7149和LTC3649采用峰值电流模式架构，允许通过固有的周期到周期电流限制保护实现快速瞬态响应。LTC3623和LTC3600的工作频率为200kHz至4MHz，具有独特的恒定导通时间架构，非常适合用于高降压比应用。

特性

LTC7149
- 3.4V to 60V V_IN range
- 0V to -28V V_OUT range
- Single resistor V_OUT programming
- Integrated 110mΩ top N-channel/50mΩ bottom n-channel MOSFETs
- 440µA regulated IQ
- 15µA shutdown IQ
- Board GND referenced I/O pins (RUN, PGOOD, MODE/SYNC)
- Accurate resistor programmable frequency (300kHz to 3MHz) with ±50% frequency sync range
- 92% efficiency with 12 V_IN and -5V_OUT
- ±0.8% output voltage accuracy
- Peak current mode operation
- Burst Mode® operation, forced continuous mode
- Programmable soft-start
- Overtemperature protection
- Available in 28-lead (4mm x 5mm) QFN and TSSOP packages
LTC3649
- 3.1V to 60V V_IN range
- 0V to V_IN-0.5V V_OUT range
- Single resistor V_OUT programming
- Integrated 110mΩ top N-channel/50mΩ bottom n-channel MOSFETs
- 95% efficiency with 12V_IN and 5V_OUT
- 440µA regulated IQ
- 18µA shutdown IQ
- Accurate current monitoring (±4%) without sensor resistor
- Accurate resistor programmable frequency (300kHz to 3MHz) with ±50% frequency sync range
- Accurate programmable output current
- Input voltage regulation for MPPT applications
- ±0.8% output voltage accuracy
- Peak current mode operation
- Programmable wire drop compensation
- Burst Mode operation, forced continuous mode
- Internal compensation and programmable soft-start
- Overtemperature protection
- Available in thermally enhanced 28-lead (4mm x 5mm) QFN and TSSOP packages
LTC3623
- 0V to V_IN - 0.5V V_OUT range
- Silent Switcher® architecture
- Tight V_OUT regulation across V_OUT range
- ±5% output current monitor accuracy
- Programmable wire drop compensation
- Easy to parallel for higher current and heat spreading
- Input supply voltage regulation loop
- Up to 96% efficiency
- ±5A output current
- Integrated N-MOSFETs (60mΩ top and 30mΩ bottom)
- 400kHz to 4MHz adjustable switching frequency
- 4V to 15V V_IN range
- Current mode operation for excellent line and load transient response
- Shutdown mode draws less than 1µA supply current
- Low profile 24-lead 3mm x 5mm QFN package

LTC3600
- Single resistor programmable V_OUT
- Tight V_OUT regulation independent of V_OUT voltage
- Easy to parallel for higher current and heat spreading
- 0V to V_IN - 0.5V V_OUT range
- Up to 96% high efficiency
- 1.5A output current
- 200kHz to 4MHz adjustable frequency
- 4V to 15V V_IN range
- Current mode operation for excellent line and load transient response
- Zero supply current in shutdown
- Available in thermally enhanced 12-pin (3mm x 3mm) DFN and MSOP packages
LTC3607
- Up to 96% efficiency
- 55µA total quiescent current
- 2.25MHz constant frequency operation
- 100% duty cycle dropout operation
- Low-ripple (typical 30mVP-P) Burst Mode operation
- Peak current-mode control architecture for excellent line and load transient response
- 4.5V to 15V voltage input range
- 600mA/channel rated output current
- 0.6V reference allows low output voltages
- ±1.5% output voltage accuracy
- IQ<1µA shutdown current
- Internal compensation
- Power good outputs
- Externally frequency synchronization (1MHz to 4MHz)
- Independent internal soft-start for each channel
- Small 16-lead thermally enhanced thin QFN (3mm x 3mm) and MSE packages