1. Overview & Key Features

️· Device: LP3308 (Boost Converter)
️· Description: A high-efficiency, current-mode control boost converter designed for applications requiring a regulated output voltage from a lower input voltage.
️· Key Features:
- Wide Input Voltage Range: 2.7V to 5.5V
- High Efficiency
- Current-Mode Control
- Shutdown Current: <1µA
- Programmable Soft-Start
- Available in TSOT23-6 and SOT23-5 packages
- Minimized External Components
- RoHS Compliant & Lead-Free

2. Applications

️· Panel Bias Voltage Supply
️· OLED Backlight Driver
️· Notebook Computers
️· Portable Applications
️· MID (Mobile Internet Device) / PTV (Portable Television)

3. Functional Pin Description

Pin Name	Function
LX	Switch Pin: Connect to inductor and catch diode. Minimize track area for reduced EMI.
GND	Ground Pin
FB	Feedback Pin: Connect to output voltage through a resistor divider to set the output voltage.
/SHDN	Shutdown/Enable Pin: Active high. Pull low to disable, connect to VCC to enable.
SS	Soft-Start Pin: Connect to a resistor and capacitor to program the soft-start time. Leave open to disable.
Vin	Supply Input Pin: Bypass with a capacitor to reduce input noise.

4. Block Diagram (See original document for visual)

5. Absolute Maximum Ratings

️· Supply Input Voltage: -0.3V to 6.0V
️· LX Input Voltage: -0.3V to 33V
️· Other Pins: -0.3V to 5.5V
️· Power Dissipation: 0.455W (TSOT23-5/6)
️· Operating Temperature: -40°C to +80°C
️· Storage Temperature: -65°C to +150°C

6. Electrical Characteristics

Parameter	Symbol	Test Conditions	Min	Typ	Max	Unit
Operating Voltage	VDD		2.7	-	6.0	V
UVLO Voltage	VDD		2.2	2.4	2.6	V
Supply Current	IDD		-	430	550	µA
Shutdown Current	IDD	VEN < 0.4V	-	0.1	1	µA
Line Regulation		VIN: 3.0V to 4.3V	-	2	-	%
Operating Frequency	FOSC		-	1.4	-	MHz
Duty Cycle			-	93	-	%
Feedback Voltage	LP3308		1.21	1.23	1.255	V
MOSFET RDS(on)	RDS(on)		-	0.7	-	Ω
SW Current Limit	ILM		-	1.4	-	A
Shutdown Voltage	VEN		0.3	-	-	V
Enable On Voltage	VEN		1.0	-	-	V

7. Typical Operating Characteristics (See original document for graphs)

8. Applications Information

️· Inductor Selection: 4.7µH to 22µH is recommended. Choose an inductor with low core loss and low DCR for better efficiency.

9. Package Information (See original document)



Key Takeaways:

️· This is a relatively simple, efficient boost converter IC.
️· It's well-suited for portable applications.
️· The datasheet provides enough information to design a basic boost converter circuit.
️· Pay attention to the inductor selection as it significantly affects performance.