350mA/250mA Advanced Current Regulator
EC4302
General Description
The EC4302 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.
EC4302 is presently available in low profile SOT-89-3L and TO252 packages.
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.
● SOT89 and TO252 package.
● EN function is available upon request.
Applications
● Power LED Driver.
● LED Flashlight Torch.
● LED Miner's Lamp.
● Lighting.
Pin Configurations
350mA/250mA Advanced Current Regulator
EC4302
Ordering Information
EC4302 NX XX X
R：Tape & Reel
A：350mA
B：250mA
B6：SOT89-3
A4：TO252
Part Number | Package | Marking | Marking Information |
EC4302NAB6R | SOT89-3 | EC4302 LLLLLA | LLLLL：Lot No |
EC4302NBB6R | EC4302 LLLLLB | ||
EC4302NAA4R | TO252 | EC4302 LLLLLA | |
EC4302NBA4R | EC4302 LLLLLB |
Applications Diagrm
350mA/250mA Advanced Current Regulator
EC4302
Absolute Maximum Ratings(1)
Parameter | Symbol | Maximum | 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 | 4302NA | 300 | 350 | 400 | mA |
4302NB | 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 |
| µA | |
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 EC4302 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 EC4302. EC4302 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 for SOT-89-3L
DIMENSIONS | ||||
DIMN | INCHES | MM | ||
MIN | MAX | MIN | MAX | |
A | 0.173 | 0.181 | 4.400 | 4.600 |
B | 0.159 | 0.167 | 4.050 | 4.250 |
C | 0.067 | 0.075 | 1.700 | 1.900 |
D | 0.051 | 0.059 | 1.300 | 1.500 |
E | 0.094 | 0.102 | 2.400 | 2.600 |
F | 0.035 | 0.047 | 0.890 | 1.200 |
G | 0.118REF | 3.00REF | ||
H | 0.059REF | 1.50REF | ||
I | 0.016 | 0.020 | 0.400 | 0.520 |
J | 0.055 | 0.063 | 1.400 | 1.600 |
K | 0.014 | 0.016 | 0.350 | 0.410 |
L | 10°TYP | 10°TYP | ||
M | 0.028REF | 0.70REF | ||
Outline Drawing for TO252
