350mA/250mA Advanced Current Regulator
EC4223
Features
No external component required.
Constant 350mA/250mA constant sink current.
Output short / open circuit protection.
Low dropout voltage.
Low quiescent current at 212uA typical.
Build-in thermal protection.
Supply voltage range 2.7V ~ 6V.
2KV HBM ESD protection.
Advanced CMOS process.
SOT-89 package
EN function is available upon request.
Description
The EC4223 is a low dropout current regulator rated for 350mA/250mA constant sink current. The constant sink current will ensure that the same amount of power is applied to the power LED and consequently maintain the uniform brightness throughout the possible voltage variations from the power source. The IC also features low quiescent current and is typically at 212uA. This will minimize the power consumption from the IC itself.
The IC has EN function built-in for applications where EN function or Dim function is needed. Please contact us directly if EN function is required.
EC4223 is presently available in low profile SOT89-3L packages.
Application
Power LED Driver.
LED Flashlight Torch.
LED Miner's Lamp.
Lighting.
Application Diagram
Pin Configuration
Ordering Information
EC4223 XX XX X
Output voltage：
AN：350mA
BN：250mA
R：Tape & Reel
B6：SOT89-3L
Absolute Maximum Rating (1)
Parameter | Symbol | Value | Units |
Input Voltage | VDD | -0.3～7V | V |
Output Voltage | VOUT | -0.3 to 4.6 | V |
Output Sink Current | IOUT | 400 | mA |
Thermal Resistance, Junction-to-Ambient（SOT89） | ΘJA | 180 | °C/W |
Lead Temperature (Soldering, 5 sec.) |
| 260 | °C |
Junction Temperature | TJ | 0 to +150 | °C |
Storage Temperature | TS | -40 to +150 | °C |
Electrical Characteristics
VDD = 3.7V; No Load; TJ = 25°C; unless otherwise noted
Symbol | Parameter | Conditions | Min | Typ | Max | Unit | |
Output Sink Current | ISINK | VOUT=0.4V | EC4223ANB6R | 300 | 350 | 400 | mA |
EC4223BNB6R | 200 | 250 | 300 | ||||
Load Regulation |
| VOUT=0.2V to 3V |
| 22 |
| mA/V | |
Line Regulation |
| VDD=3V to 6V ，VOUT=0.2V |
| 1.88 |
| mA/V | |
Output Dropout Voltage (2) | VOUTL |
|
| 150 |
| mV | |
Supply Current Consumption | IDD |
|
| 212 |
| A | |
Note 1: Exceeding the absolute maximum rating may damage the device.
Note 2: Output dropout voltage: 90% x IOUT @ VOUT=200mV
Thermal Considerations
It is important that the thermal limit of the package is not exceeded. The EC4223 has built-in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and VOUT will be pulled to ground. The power dissipation for a given application can be calculated as following:
The power dissipation (PD) is PD = IOUT * [VIN – VOUT]
The thermal limit of the package is then limited to PD(MAX) = [TJ – TA]/ΘJA where TJ is the junction temperature, TA is the ambient temperature, and ΘJA is around 180°C/W for EC4223. EC4223 is designed to enter thermal protection at 150°C. For example, if TA is 25°C then the maximum PD is limited to about 0.7W. In other words, if IOUT(MAX) = 350mA, then [VIN – VOUT] cannot exceed 2V.
OUTLINE DRAWING SOT89-3L
