MB3778P Fujitsu Microelectronics, Inc., MB3778P Datasheet - Page 3

• Manufacturer Part Number: MB3778P
• Description: Switching Regulator Controller
• Manufacturer: Fujitsu Microelectronics, Inc.

No.
PIN DESCRIPTION
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
E/GND Ground terminal.
DTC1
OUT1
OUT2
DTC2
SCP
FB1
FB2
CTL
V
Pin
V
C
R
IN1
IN1
IN2
REF
CC
T
T
Oscillator timing capacitor terminal (150 pF to 15,000 pF) .
Oscillator timing resistor terminal (5.1 k to 100 k ) .
V
Error amplifier 1 non-inverted input terminal.
Error amplifier 1 inverted input terminal.
Error amplifier 1 output terminal.
A resistor and a capacitor are connected between this terminal and the IN1 terminal to ad-
just gain and frequency.
OUT1 dead-time control terminal.
Dead-time control is adjusted by an external resistive divider connected to the V
A capacitor connected between this terminal and GND enables soft-start operation.
Open collector output terminal.
Output transistor has common ground independent of signal ground.
This output can source or sink up to 50 mA.
Power supply terminal (3.6 to 18 V)
Open collector output terminal.
Output transistor has common ground independent of signal ground.
This output can source or sink up to 50 mA.
Sets the dead-time of OUT2.
The use of this terminal is the same as that of DTC1.
Error amplifier 2 output terminal.
Sets the gain and adjusts the frequency when a resistor and a capacitor are connected be-
tween this terminal and the IN2 terminal.
Voltage of V
2. Uses error amplifier 2 for positive voltage output.
Error amplifier 2 inverted input terminal.
Power control terminal.
The IC is set in the stand-by state when this terminal is set “Low.”
Current consumption is 10 A or lower in the stand-by state.
The input can be driven by TTL or CMOS.
The time constant setting capacitor connection terminal of the timer latch short-circuit protec-
tion circuit.
Connects a capacitor between this pin and GND.
For details, see “How to set time constant for timer latch short-circuit protection circuit”.
2.46 V reference voltage output terminal which can be obtained up to 1 mA.
This pin is used to set the reference input and idle period of the error amplifiers.
REF
1/2 voltage is also available at this pin for error amplifier reference input.
REF
1/2 voltage is internally connected to the non-inverted input of error amplifier
Function
MB3778
REF
pin.
3