MB3785A_03 Datasheet, PDF (1/30 Pages) Fujitsu Component Limited. – Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities)

FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27208-4E
ASSP
BIPOLAR
Switching Regulator Controller
(4 Channels plus High-Precision, High-Frequency Capabilities)
MB3785A
s DESCRIPTION
The MB3785A is a PWM-based 4-channel switching regulator controller featuring high-precision, high-frequency
capabilities. All of the four channels of circuits allow their outputs to be set in three modes: step-down, step-up,
and inverted. The third and fourth channels are suited for DC motor speed control.
The triangular-wave oscillation circuit accepts a ceramic resonator, in addition to the standard method of oscillation
using an RC network.
s FEATURES
• Wide range of operating power supply voltages: 4.5 V to 18 V
• Low current consumption: 6 mA [Typ] when operating10 µA or less during standby
• Built-in high-precision reference voltage generator: 2.50 V±1%
• Oscillation circuit
- Capable of high-frequency oscillation: 100 kHz to 1 MHz
- Also accepts a ceramic resonator.
• Wide input range of error amplifier: –0.2 V to VCC–1.8 V
• Built-in timer/latch-actuated short-circuiting detection circuit
• Output circuit
- The drive output for PNP transistors is the totem-pole type allowing the on-current and off-current values to
be set independently.
s PACKAGE
(Continued)
48-pin, Plastic LQFP
(FPT-48P-M05)