0
ACTIVE
Rating |
Automotive |
Topology |
Boost, Flyback, Forward, SEPIC |
Vin (max) (V) |
40 |
Vin (min) (V) |
2.97 |
Vout (max) (V) |
500 |
Vout (min) (V) |
1.26 |
Control mode |
current mode |
Features |
Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Nonsynchronous rectification, Prebias startup |
Duty cycle (max) (%) |
100 |
Iq (typ) (A) |
0.0027 |
Operating temperature range (°C) |
-40 to 125 |
VSSOP (DGK)-8-14.7 mm² 3 x 4.9
The LM3478Q-Q1 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478Q-Q1 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478Q-Q1 can be adjusted to any value between 100kHz and 1MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.
The LM3478Q-Q1 has built in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.
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