NCP1547DR2G ON Semiconductor, NCP1547DR2G Datasheet - Page 3

• Manufacturer Part Number: NCP1547DR2G
• Description: IC REG BUCK 1.5A 340KHZ 8-SOIC
• Manufacturer: ON Semiconductor
• Type: Step-Down (Buck)r

Specifications of NCP1547DR2G

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.5 ~ 24 V
• Current - Output: 1.5A
• Frequency - Switching: 340kHz
• Voltage - Input: 4.5 ~ 40 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PACKAGE PIN DESCRIPTION
SO−8
1
2
3
4
5
6
7
8
−
−
14, 15, 18
9, 11, 12,
DFN−18
2−4
5−7
10
13
16
17
1
8
−
BOOST
SHDNB
V
V
SW
IN
SYMBOL
BOOST
SHDNB
SYNC
GND
V
PIN
V
V
1
NC
V
SW
−
FB
IN
C
SO−8
The BOOST pin provides additional drive voltage to the on−chip NPN power transistor. The
resulting decrease in switch on voltage increases efficiency.
This pin is the main power input to the IC.
This is the connection to the emitter of the on−chip NPN power transistor and serves as the
switch output to the inductor. This pin may be subjected to negative voltages during switch off−
time. A catch diode is required to clamp the pin voltage in normal operation. This node can
stand −1.0 V for less than 50 ns during switch node flyback.
The shutdown pin is active low and TTL compatible. The IC goes into sleep mode, drawing less
than 1.0 mA when the pin voltage is pulled below 1.0 V.
This pin should be pulled up to V
This pin provides the synchronization input.
Power return connection for the IC.
The FB pin provides input to the inverting input of the error amplifier. If V
the oscillator frequency is divided by four, and current limit folds back to about 1 A. These fea-
tures protect the IC under severe overcurrent or short circuit conditions.
The V
comparator. Driving of this pin should be avoided because on−chip test circuitry becomes active
whenever current exceeding 0.5 mA is forced into the IC.
No Connection
Exposed die attach pad. Internally connected to GND. External connection to GND is optional.
C
pin provides a connection point to the output of the error amplifier and input to the PWM
8
V
V
GND
SYNC
C
FB
PIN CONNECTIONS
http://onsemi.com
3
CC
BOOST
SHDNB
with a resistor.
V
V
Vsw
V
V
V
NC
SW
SW
IN
IN
IN
FUNCTION
18−Lead DFN
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
10
11
NC
V
V
NC
NC
GND
NC
NC
SYNC
C
FB
FB
is lower than 0.29 V,