mb3778pfv Fujitsu Microelectronics, Inc., mb3778pfv Datasheet - Page 3

• Manufacturer Part Number: mb3778pfv
• 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 V 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