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LM5155 Non-Synchronous Boost Controller
Texas Instruments' controller can be used in boost, SEPIC, and flyback topologies
Texas Instruments' LM5155 device is a wide input range, non-synchronous boost controller that uses peak current mode control and can be used in boost, SEPIC, and flyback topologies.
The LM5155 device can start up from a 1-cell battery with a minimum of 2.97 V if the BIAS pin is connected to the VCC pin. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V.
The internal VCC regulator also supports BIAS pin operation up to 45 V (50 V absolute maximum). The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response.
The device features a 1.5 A standard MOSFET driver and a low 100 mV current limit threshold. The device supports the use of an external VCC supply to improve efficiency. Low operating current and pulse-skipping operation improve efficiency at light loads.
The device has built-in protection features such as cycle-by-cycle current limit, overvoltage protection, line UVLO, and thermal shutdown. Hiccup-mode overload protection is available in the LM51551 device option. The controller includes low shutdown IQ, programmable soft-start, programmable slope compensation, precision reference, a PGOOD indicator, and external clock synchronization.
- Wide input operating range for battery applications
- Operating range: 3.5 V to 45 V
- 2.97 V to 16 V when BIAS = VCC
- Minimum boost supply voltage: 1.5 V when BIAS ≥3.5 V
- Input transient protection: up to 50 V
- Minimized battery drain:
- Low shutdown current (IQ ≤ 2.6 µA)
- Low operating current (IQ ≤ 480 µA)
- Small solution size and low-cost:
- Maximum switching frequency: 2.2 MHz
- 12-pin WSON package: 3 mm x 2 mm
- Integrated error amp allows primary-side regulation without optocoupler (flyback)
- Minimized undershoot during cranking (start-stop application)
- Accurate ±1% accuracy feedback reference
- Programmable extra slope compensation
- High efficiency with low-power dissipation:
- 100 mV ±7% low current limit threshold
- Strong 1.5 A peak standard MOSFET driver
- Supports external VCC supply
- Avoid AM band interference and crosstalk:
- Optional clock synchronization
- Dynamically programmable switching frequency: 100 kHz to 2.2 MHz
- Integrated protection:
- Constant peak current limiting over input voltage
- Optional hiccup-mode short-circuit protection
- Programmable line UVLO
- OVP protection
- Thermal shutdown
- Adjustable soft-start
- PGOOD indicator
- Multiple output flybacks without optocouplers
- LED bias supplies
- Wide input boosts, SEPICs, and flyback power modules
- Portable speakers
- Battery-powered boosts, SEPICs, and flybacks
LM5155 Non-Synchronous Boost Controller
| Image | Manufacturer Part Number | Description | Output Configuration | Topology | Number of Outputs | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|---|---|---|
 |  | LM51551DSST | 2.2MHZ WIDE VIN NON-SYNCHRONOUS | Positive | Boost, Flyback, SEPIC | 1 | 2645 - Immediate | $21.90 | View Details |
Evaluation Board
| Image | Manufacturer Part Number | Description | Outputs and Type | Power - Output | Voltage - Output | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|---|---|---|
|  | LM5155EVM-BST | EVAL BOARD FOR LM5155 | 1 Non-Isolated Output | - | 24V | 9 - Immediate | $582.83 | View Details |
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