Analog Devices Inc. LTC31xx Synchronous Buck-Boost DC-DC Converters

Analog Devices Inc. LTC31xx Synchronous Buck-Boost DC-DC Converters are high-efficiency, ultra-low noise, and excellent for wireless long-life applications. The LTC3130 (600mA) and LTC3129 (200mA) have wide V_IN and V_OUT ranges and a 1.2MHz PWM architecture that minimizes the solution footprint.

Analog Devices LTC3111 has a fixed frequency, an extended input and output range, and is suitable for a wide variety of single or multiple cell batteries and wall adapter applications. The LTC3115-1 DC/DC converters feature programmable frequency PWM mode operation and provide low noise, high efficiency, and the ability to synchronize switching to an external clock. The converters have additional features such as power good output and thermal shutdown.

Features

LTC3111 Features
- Regulated output with V_IN above, below or equal to V_OUT
- 2.5V to 15V input and output voltage range
- 1.5A continuous output current
- Single inductor
- Accurate RUN threshold
- Up to 95% efficiency
- 800kHz switching frequency, synchronizable between 600kHz and 1.5MHz
- 49μA no-load quiescent current in Burst Mode^® operation
- Output disconnect in shutdown
- Shutdown current < 1μA
- Internal soft-start
- Small, thermally enhanced 14-lead (3mm × 4mm × 0.75mm) DFN and 16-lead MSOP packages
LTC3130 Features
- Regulates V_OUT above, below, or equal to V_IN
- 2.4V to 25V (<1V to 25V Using EXTVCC Input) V_IN range
- 1V to 25V V_OUT range
- Adjustable output voltage (LTC3130)
- Four selectable fixed output voltages (LTC3130-1)
- 1.2µA no-load input current in Burst Mode operation (V_IN = 12V, V_OUT = 5V)
- 600mA output current in buck mode
- Pin-selectable 850mA/450mA current limit (LTC3130)
- Up to 95% efficiency
- Pin-selectable burst mode operation
- 1.2MHz ultra-low noise PWM frequency
- Accurate RUN pin threshold
- Programmable maximum power point control
- IQ = 500nA in shutdown
- Thermally-enhanced 20-lead 3mm × 4mm QFN and 16-lead MSOP packages

LTC3129 Features:
- Regulates V_OUT above, below, or equal to VIN
- V_IN Range: 2.42V to 15V, 1.92V to 15V after start-up (bootstrapped)
- 1.4V to 15.75V V_OUT range
- 200mA output current in buck mode
- Single inductor
- 1.3μA quiescent current
- Programmable maximum power point control
- 1.2MHz ultra-low noise PWM
- Current mode control
- Pin selectable Burst Mode operation
- Up to 95% efficiency
- Accurate RUN pin threshold
- Power good indicator
- 10nA shutdown current
- Thermally enhanced 3mm × 3mm QFN and 16-lead MSOP packages
LTC3115-1 Features:
- 2.7V to 40V V_IN range
- 2.7V to 40V V_OUT range
- 1A output current for VIN ≥ 3.6V, VOUT = 5V
- 2A output current in step-down operation for VIN ≥ 6V
- 100kHz to 2MHz programmable frequency
- Synchronizable up to 2MHz with an external clock
- Up to 95% efficiency
- 30µA no-load quiescent current in Burst Mode operation
- Ultra-low noise buck-boost PWM
- Internal soft-start
- 3µA supply current in shutdown
- Programmable input undervoltage lockout
- Small 4mm × 5mm × 0.75mm DFN package
- Thermally enhanced 20-lead TSSOP package