LP6250
Low IQ boost converter with 1A output capability for single-cell battery step-up applications
Product Overview
Description
The LP6250 is a high-efficiency boost converter designed to generate higher output voltages from single-cell batteries. It can deliver up to 1A output current with input voltages as low as 0.9V, making it ideal for applications powered by single AA/AAA or Li-ion cells.
The converter operates from 0.9V to 5.5V input and can produce output voltages up to 5.5V. The fixed 1.2MHz switching frequency allows the use of small external components. At light loads, the device enters power-save mode with only 15μA quiescent current.
The LP6250 includes under-voltage lockout, current limit, and thermal shutdown protection. The enable pin allows power sequencing and shutdown control. Available in a compact SOT-23-5 package, it is perfect for portable electronics requiring boosted voltage rails.
Product Series
LP
Primary Application
Single-cell battery devices
Key Features
- Operates from 0.9V input voltage
- Up to 1A output current
- High efficiency up to 93%
- Low 15μA quiescent current
- 1.2MHz fixed switching frequency
- Power-save mode at light loads
- Enable pin for power control
- Under-voltage lockout protection
Specifications
| Input Voltage Range | 0.9V - 5.5V |
|---|---|
| Output Voltage Range | 1.8V - 5.5V (adjustable) |
| Output Current | 1A max (at VIN=3.6V, VOUT=5V) |
| Efficiency | Up to 93% |
| Quiescent Current | 15μA (power-save mode) |
| Switching Frequency | 1.2MHz fixed |
| Load Regulation | ±1% |
| Line Regulation | ±0.5%/V |
| Operating Temperature | -40°C to +85°C |
| Package | SOT-23-5 |
Applications
Single-cell battery devices
Battery and charging management
Portable medical equipment
Medical electronics
Wireless sensors
Sensor signal conditioning
LED drivers
Motor drive and control systems
USB OTG power
Electronic system design
FAE Expert Insights
"The LP6250 is my go-to boost converter for single-cell battery applications. The ability to start up from 0.9V is impressive - it can squeeze every last bit of energy from AA/AAA batteries. I've used it in designs where the battery voltage drops below 1V and the converter keeps running. The 93% efficiency is achievable in practice, especially when the voltage step-up ratio is moderate. The 15μA quiescent current in power-save mode is excellent for extending battery life in standby. One implementation tip: the inductor selection is critical - use a low DCR inductor (under 100mΩ) for best efficiency. I typically use a 4.7μH inductor for 1A output applications. The output voltage setting resistors should be placed close to the FB pin. I've successfully used this converter in wireless sensor nodes where it boosts a single AA cell to 3.3V for the microcontroller. Overall, a reliable boost converter with excellent low-voltage operation."
Low-voltage boost converter operating from 0.9V with high efficiency and low quiescent current
— Dr. Chen Li, BeiLuo
Frequently Asked Questions
What is the minimum input voltage for LP6250?
The LP6250 can operate from input voltages as low as 0.9V. This low input voltage capability makes it ideal for single-cell battery applications where the battery voltage drops during discharge. The converter can start up from 0.9V and continue operating as the battery depletes.
0.9V minimum input ideal for single-cell batteries; can extract maximum energy from battery.
What is the maximum output voltage of LP6250?
The LP6250 can generate output voltages up to 5.5V. The output voltage is set using an external resistor divider. Common output voltages include 3.3V and 5V for powering microcontrollers and USB devices from single-cell batteries.
Up to 5.5V output suitable for 3.3V and 5V rails; set with external resistor divider.
What is the efficiency of LP6250?
The LP6250 achieves up to 93% efficiency. Efficiency depends on input voltage, output voltage, and load current. Higher efficiency is achieved with moderate step-up ratios (e.g., 3.6V to 5V) and at moderate to heavy loads.
93% efficiency excellent for boost applications; actual efficiency varies with operating conditions.
What is the quiescent current of LP6250?
The LP6250 features a low quiescent current of 15μA in power-save mode at light loads. This low current consumption helps extend battery life in applications with variable load conditions where the device spends significant time in standby.
15μA quiescent current excellent for battery life; power-save mode activates at light loads.
What external components are needed for LP6250?
The LP6250 requires an input capacitor (10μF ceramic), an output capacitor (10μF ceramic), an inductor (4.7μH typical), and two resistors for output voltage setting. Use a low DCR inductor for best efficiency.
Minimal external components; use low DCR inductor and ceramic capacitors for best performance.
Is LP6250 suitable for LED driver applications?
Yes, the LP6250 can be used for LED driver applications. It can boost battery voltage to drive series LEDs. However, for precise LED current control, additional current regulation circuitry may be needed depending on the application requirements.
Suitable for LED driving; consider additional current regulation for precise control.
What protection features does LP6250 include?
The LP6250 includes under-voltage lockout (UVLO), current limit, and thermal shutdown protection. The UVLO prevents operation at input voltages too low for reliable performance. Current limit protects against output shorts, and thermal shutdown prevents overheating.
Built-in protections ensure reliable operation; UVLO prevents unreliable low-voltage operation.