BD9778F-E2 Rohm Semiconductor, BD9778F-E2 Datasheet - Page 6

• Manufacturer Part Number: BD9778F-E2
• Description: IC REG SW 2A P-CH MOSF STDN SOP8
• Manufacturer: Rohm Semiconductor
• Type: Step-Down (Buck)r

Specifications of BD9778F-E2

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1 ~ 35 V
• Current - Output: 2A
• Frequency - Switching: 50kHz ~ 500kHz
• Voltage - Input: 7 ~ 35 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOP
• Power - Output: 690mW
• No. Of Outputs: 1
• Output Voltage: 35V
• Output Current: 2A
• Voltage Regulator Case Style: SOP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Svhc: No SVHC (18-Jun-2010)
• Base Number: 9778
• Input Voltage: 35 V
• Switching Frequency: 102 KHz
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: BD9778F-E2TR

V
SW
PVIN
IN
GND
N.C.
Block diagram / Application circuit / Pin assignment
V
IN
GND
RT
SW
No.
FB
(BD9001F)
(BD9778F)
EN
No.
RT
1
2
3
4
5
6
7
8
INV
FB
1
2
3
4
5
6
7
8
EN
INV
220μF
Pin name
23kΩ
10kΩ
Pin name
4700pF
4700pF
GND
220μF
PV
23kΩ
SW
INV
10kΩ
V
GND
EN
RT
N.C.
FB
SW
INV
EN
V
1μF
FB
RT
150kΩ
IN
IN
IN
V
INV
IN
FB
1μF
150kΩ
8
4
3
8
1
4
3
START
0.1μF
SOFT
INV
START
FB
PV
V
SOFT
0.1μF
IN
IN
ERROR AMP
Vref
Vref
-
+
+
ERROR AMP
Power supply input
Output
Error Amp output
Output voltage feedback
Enable
Frequency setting resistor connection
Ground
Power system power supply input
-
+
+
Output
Non Connection
Error Amp Output
Output voltage feedback
Enable
Frequency setting resistor connection
Ground
Power supply input
OSC
Fig.25
6
OSC
6
390kΩ
Fig.23
RT
-
+
RT
-
Vref
+
390kΩ
Vref
RESET
PWM
COMPARATOR
COMPARATOR
RESET
PWM
LATCH
Function
LATCH
CURRENT LIMIT
Function
ON/OFF
CURRENT LIMIT
DRIVER
TSD
DRIVER
TSD
-
+
-
+
L:OFF
H:ON
V
IN
V
IN
GND
EN
SW
1
7
SW
GND
5
2
7
33 μH
33μH
330μF
330μF
V
O
V
O
6/16
V
V
IN
IN
SW
SW
No.
FIN
RT
FB
No.
FIN
(BD9778HFP)
(BD9781HFP)
1
2
3
4
5
6
7
GND
GND
1
2
3
4
5
6
7
INV
FB
INV
RT
EN/SINC
EN
EN/SYNC
Pin name
Pin name
GND
GND
INV
SW
V
RT
FB
INV
SW
V
RT
EN
-
FB
220μF
4700pF
-
IN
23kΩ
10kΩ
IN
220μF
4700pF
23kΩ
10kΩ
1μF
150kΩ
1μF
1
5
3
150kΩ
INV
START
FB
V
SOFT
0.1μF
IN
1
6
5
Power supply input
Output
Error Amp output
Ground
Output voltage feedback
Frequency setting resistor connection
Enable
Ground
Power supply input
Output
Frequency setting resistor connection
Ground
Error Amp output
Output voltage feedback
Enable/Synchronizing pulse input
Ground
INV
ERROR AMP
Vref
START
FB
V
SOFT
0.1μF
IN
-
+
+
Vref
ERROR AMP
-
+
+
OSC
Fig.26
6
Fig.24
OSC
RT
-
+
3
390kΩ
Vref
RT
-
+
COMPARATOR
RESET
390kΩ
Function
Vref
PWM
COMPARATOR
RESET
LATCH
PWM
Function
SYNC
LATCH
ON/OFF
CURRENT LIMIT
DRIVER
TSD
ON/OFF
CURRENT LIMIT
+
-
L:OFF
H:ON
DRIVER
TSD
+
-
L:OFF
H:ON
V
IN
GND
V
EN
IN
SW
7
2
4
EN/
SYNC
GND
SW
7
2
4
33μH
330μF
33μH
330μF
V
O
V
O