LTC3115 Synchronous Buck-Boost Converter Getting Started Guide
Linear Technology introduces the LTC3115-1's high temperature Class H (-40°C to 150°C junction temperature) and high reliability MP stage (-55°C to 150°C) versions with 20-pin resistance Thermal performance enhanced TSSOP package. The LTC3115-1 is a synchronous buck-boost converter that achieves up to 2A of continuous output current from a single-cell Li-Ion battery, 24V/28V industrial power supply, and a wide supply range of 40V automotive inputs.
The LTC3115-1's 2.7V to 40V input and output range provides a regulated output, while the input can be higher, lower, or equal to the regulated output. The low noise buck-boost topology used in the LTC3115-1 enables continuous jitter-free conversion between buck and boost modes, making it ideal for RF and other noise-sensitive applications that must be variable Maintain a low noise constant output voltage in the input supply. Up to 95% efficiency extends the runtime of battery-powered systems. The user can set the switching frequency of the LTC3115-1 from 100kHz to 2MHz and synchronize to an external clock. A proprietary buck-boost PWM circuit ensures low noise and high efficiency while reducing the size of external components. The combination of tiny external components and the TSSOP-20E package creates a compact footprint solution.
The H-grade version operates from -40 ° C to a maximum junction temperature of 150 ° C, ensuring proper operation over this temperature range. Similarly, the MP version has an operating junction temperature range of -55 ° C to 150 ° C, which is guaranteed and tested over this temperature range. The electrical specifications of the H and MP grades are consistent with the industrial grade. The device is ideal for automotive, industrial and military applications where extreme ambient temperature conditions are required.
Performance summary:
LTC3115H/MP:
Wide VIN range: 2.7V to 40V
Wide VOUT range: 2.7V to 40V
1A output current (for VIN ≥ 3.6V, VOUT = 5V)
2A output current (for VIN ≥ 6V in buck mode)
Programmable frequency: 100kHz to 2MHz
Can be synchronized to an external clock up to 2MHz
Up to 95% efficiency
No load quiescent current of 30μA in Burst Mode®
Ultra Low Noise Buck-Boost PWM
Internal soft start
3μA supply current in shutdown mode
Programmable input undervoltage lockout
Thermally Enhanced 20-Lead TSSOP Package
MP grade range from -55 ° C to 150 ° C temperature range
H-class of -40 ° C to 150 ° C temperature range
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