Overview
The FAN5622SX, part of the FAN562x family from ON Semiconductor, is a two-channel current-sink linear LED driver. This device is designed to backlight the main LCD displays or keypads in mobile electronics such as cellular phone handsets, mobile internet devices, and other portable devices. It features a very low dropout voltage of 50 mV, allowing it to drive LEDs without the need for inductors or switch capacitors. The brightness levels of the LED outputs can be programmed through a single-wire digital control interface, enabling 32 linear dimming steps.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VIN | Power Supply Voltage Range | 2.7 | 5.5 | V | |
| ILED(FS) | Full-Scale LED Current | 5 | 30 | mA | |
| ISD | Shutdown Supply Current | 0.3 | 1.0 | μA | |
| IIN | Operating Supply Current | 0.4 | 0.8 | mA | |
| VUVLO | Under-Voltage Lockout Threshold | 2.10 | 2.50 | 2.70 | V |
| VDROPOUT | Dropout Voltage | 50 | mV | ||
| TJ | Junction Temperature | -40 | 150 | °C |
Key Features
- Family of linear current-sink LED drivers supporting 2, 4, or 6 LED outputs (FAN5622 supports 2 outputs)
- Current sink driver for each LED output with up to 30 mA maximum output current and 50 mV dropout at 15 mA IOUT
- Better than 3% matching between channels
- External RSET for setting the maximum LED current
- Single-wire digital control interface for easy programming with 32 linear steps of dimming control
- Less than 1 μA shutdown current
- Short-circuit, under-voltage, and thermal protection
- Wide input voltage range: 2.7 to 5.5 V
- Small form-factor packages: 6-pin Super SOT23 for FAN5622
- Pb-free devices
Applications
- Mobile handsets
- Mobile internet devices
- PMP and MP3 players
- LCD modules
Q & A
- What is the input voltage range for the FAN5622SX?
The input voltage range is from 2.7 V to 5.5 V.
- How many dimming steps are available for the LED outputs?
The FAN5622SX allows for 32 linear dimming steps.
- What is the maximum output current per LED channel?
The maximum output current per LED channel is 30 mA.
- What type of protection does the FAN5622SX offer?
The device offers short-circuit, under-voltage, and thermal protection.
- How is the maximum LED current set?
The maximum LED current is set using an external resistor (RSET) tied to the ISET pin.
- What is the dropout voltage at 15 mA IOUT?
The dropout voltage at 15 mA IOUT is typically 50 mV.
- What is the typical shutdown current?
The typical shutdown current is less than 1 μA.
- What is the operating junction temperature range?
The operating junction temperature range is from -40°C to +125°C.
- What type of package is the FAN5622SX available in?
The FAN5622SX is available in a 6-pin Super SOT23 package.
- Is the FAN5622SX a Pb-free device?
Yes, the FAN5622SX is a Pb-free device.
