The LM3414 and LM3414HV are 1-A 60-W(1) common anode-capable constant current buck LED drivers. They are suitable for driving single string of 3-W HBLED with up to 96% efficiency. They accept input voltages from 4.5 VDC to 65 VDC and deliver up to 1-A average LED current with ±3% accuracy. The integrated low-side N-channel power MOSFET and current sensing element realize simple and low component count circuitry, as no bootstrapping capacitor and external current-sensing resistor are required. An external small-signal resistor to ground provides very fine LED current adjustment, analog dimming, and thermal fold-back functions.
Constant switching frequency operation eases EMI. No external loop compensation network is needed. The proprietary Pulse-Level-Modulation (PLM) control method benefits in high conversion efficiency and true average LED current regulation. Fast response time realizes fine LED current pulse fulfilling the 240 Hz 256-step dimming resolution requirement for general lighting.
The LM3414 and LM3414HV are available in SOIC-8 and 3 mm × 3 mm WSON-8 packages.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM3414, LM3414HV |
WSON (8) | 3.00 mm × 3.00 mm |
SOIC (8) | 3.90 mm × 4.89 mm |
Changes from E Revision (May 2013) to F Revision
Changes from D Revision (April 2013) to E Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
VCC | 1 | O | Internal Regulator Output Pin. This pin should be bypassed to ground by a ceramic capacitor with a minimum value of 1 µF. |
PGND | 2 | — | Power Ground Pin. Ground for power circuitry. Reference point for all stated voltages. Must be externally connected to EP and GND. |
IADJ | 3 | I | Average Output Current Adjustment Pin. Connect resistor RIADJ from this pin to ground to adjust the average output current. |
GND | 4 | — | Analog Ground Pin. Analog ground connection for internal circuitry, must be connected to PGND external to the package. |
FS | 5 | I | Switching Frequency Setting Pin. Connect resistor RFS from this pin to ground to set the switching frequency. |
DIM | 6 | I | PWM Dimming Control Pin. Apply logic level PWM signal to this pin controls the intend brightness of the LED string. |
LX | 7 | O | Drain of N-MOSFET Switch. Connect this pin to the output inductor and anode of the schottky diode. |
VIN | 8 | I | Input Voltage Pin. The input voltage should be in the range of 4.5 V to 42 V (LM3414) or 4.5 V to 65 V (LM3414HV). |
EP | EP | — | Thermal Pad (Power Ground). Used to dissipate heat from the package during operation. Must be electrically connected to PGND external to the package. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VIN to GND | LM3414 | –0.3 | 42 | V |
LM3414HV | –0.3 | 65 | ||
VIN to GND (Transient) | LM3414 | 45 (500 ms) | V | |
LM3414HV | 67 (500 ms) | |||
LX to PGND | LM3414 | –0.3 | 42 | V |
LM3414HV | –0.3 | 65 | ||
LX to PGND (Transient) | LM3414 | –3 (2 ns) | 45 (500 ms) | V |
LM3414HV | –3 (2 ns) | 67 (500 ms) | ||
FS, IADJ to GND | –0.3 | 5 | V | |
DIM to GND | –0.3 | 6 | V | |
Storage Temperature | –65 | 125 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
WSON PACKAGE | ||||
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)(3) | ±2000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±750 | |||
SOIC PACKAGE | ||||
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)(3) | ±2000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±750 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
VIN | LM3414 | 4.5 | 42 | V | |
LM3414HV | 4.5 | 65 | |||
Junction temperature | –40 | 125 | °C |
THERMAL METRIC(1) | LM3414, LM3414HV | UNIT | ||
---|---|---|---|---|
NGQ (WSON) | DDA (SOIC-8) | |||
8 PINS | 8 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 47.7 | 50.5 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 43.1 | 55.7 | °C/W |
RθJB | Junction-to-board thermal resistance | 22.3 | 28.6 | °C/W |
ψJT | Junction-to-top characterization parameter | 0.4 | 9.5 | °C/W |
ψJB | Junction-to-board characterization parameter | 22.5 | 28.5 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 4 | 3.2 | °C/W |
PARAMETER | TEST CONDITIONS | MIN(1) | TYP(2) | MAX(1) | UNIT | |
---|---|---|---|---|---|---|
SYSTEM PARAMETERS - LM3414 | ||||||
IIN-DIM-HIGH | Operating Current | 4.5 V ≤ Vin ≤ 42 V RIADJ = 3.125 kΩ VDIM = High |
2.2 | 3.2 | 3.5 | mA |
IIN-DIM-LOW | Standby Current | 4.5 V ≤ Vin ≤ 42 V RIADJ = 3.125 kΩ VDIM = Low |
0.8 | 1.15 | 1.4 | mA |
ILX-OFF | LX Pin Current | Main Switch Turned OFF VLX = VIN = 42 V |
6 | µA | ||
SYSTEM PARAMETERS - LM3414HV | ||||||
IIN-DIM-HIGH | Operating Current | 4.5 V ≤ Vin ≤ 65 V RIADJ = 3.125 kΩ VDIM = High |
2.2 | 3.3 | 3.6 | mA |
IIN-DIM-LOW | Standby Current | 4.5 V ≤ Vin ≤ 65 V RIADJ = 3.125 kΩ VDIM = Low |
0.8 | 1.2 | 1.45 | mA |
ILX-OFF | LX Pin Current | Main Switch Turned OFF VLX = VIN= 65 V |
6.5 | µA | ||
SYSTEM PARAMETERS - LM3414/3414HV | ||||||
ILED | Average LED Current | RIADJ = 3.125 kΩ TA = 25°C |
0.97 | 1 | 1.03 | A |
RIADJ = 3.125 kΩ TA = –40°C to 125°C |
0.95 | 1 | 1.05 | A | ||
VCC-UVLO | Vcc UVLO Threshold | VCC Decreasing, TA = 25°C | 3.6 | 3.75 | 3.9 | V |
VCC-UVLO-HYS | Vcc UVLO Hysteresis | 300 | mV | |||
VIADJ | IADJ Pin voltage | 1.23 | 1.255 | 1.280 | V | |
VDIM | DIM Pin Threshold | VDIM Increasing | 1 | 1.2 | V | |
VDIM-HYS | DIM Pin Hysteresis | 100 | mV | |||
fSW | Switching frequency | 250 | 500 | 1000 | kHz | |
fSW-TOL | Switching frequency tolerance | RFS = 40 kΩ | 420 | 500 | 580 | kHz |
tON-MIN | Minimum on-time | 400 | ns | |||
INTERNAL VOLTAGE REGULATOR | ||||||
VCC | VCC regulator output voltage(3) | CVCC = 1 µF, No Load to IVCC = 2 mA | 4.7 | 5.4 | 6 | V |
VIN = 4.5 V, 2-mA Load | 3.8 | 4.2 | V | |||
MAIN SWITCH | ||||||
RLX | Resistance across LX and GND | Main Switch Turned ON | 1.8 | Ω | ||
THERMAL PROTECTION | ||||||
TSD | Thermal shutdown temperature | TJ Rising | 170 | °C | ||
TSD-HYS | Thermal shutdown temperature hysteresis | TJ Falling | 10 | °C |