Regulator ICs
4-channel switching regulator controller
BA9737KV
The BA9737KV is a 4-channel controller that includes al...
Regulator ICs
4-channel switching
regulator controller
BA9737KV
The BA9737KV is a 4-channel controller that includes all of the circuits required to construct a switching
regulator. The circuits on the chip include a triangular-wave oscillator, a reference voltage circuit, an error amplifier, a PWM comparator, a pseudo-totem-pole driver, and a short-circuit protection circuit. FApplications Camcoders and digital still cameras etc. FFeatures 1) The totem-pole driver can directly drive power
transistors, and the on current can be set to the rating current using an external resistor. For the off current, the peak current can be set using an external capacitor. 2) Output cutoff circuit (timer latch type) for overload protection.
3) Channels 2 and 3 are supplied using the internal reference voltage, and use a positive voltage only. Channels 1 and 4 are general-purpose channels, and all inputs are externally available. 4) Channels can be switched off individually or all together (STB and STB1 to STB4). 5) Dead-time control is provided for all channels, and duty limits can be used.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
412
Regulator ICs
FBlock diagram
BA9737KV
413
Regulator ICs
FPin assignments
BA9737KV
FPin descriptions
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Regulator ICs
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 6.0V, fosc = 0.45MHz, STB, STB1 to STB4 = 5V)
BA9737KV
415
Regulator ICs
FOperation notes (1) Use short and wide wir...