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CS51414EDR8G Scheda tecnica(PDF) 2 Page - ON Semiconductor

Il numero della parte CS51414EDR8G
Spiegazioni elettronici  1.5 A, 260 kHz and 520 kHz, Low Voltage Buck Regulators with External Bias or Synchronization Capability
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Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS51414EDR8G Scheda tecnica(HTML) 2 Page - ON Semiconductor

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CS51411, CS51412, CS51413, CS51414
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2
PIN CONNECTIONS
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
BOOST
VIN
VIN
VIN
Vsw
VSW
VSW
SHDNB
NC
NC
VC
VFB
NC
NC
GND
NC
NC
SYNC
SYNC
SHDNB
18
GND
VSW
VFB
VIN
VC
BOOST
SHDNB
BIAS
18
GND
VSW
VFB
VIN
VC
BOOST
CS51412/4
CS51411/3
CS51411/3
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
BOOST
VIN
VIN
VIN
Vsw
VSW
VSW
BIAS
NC
NC
VC
VFB
NC
NC
GND
NC
NC
SHDNB
CS51412/4
PACKAGE PIN DESCRIPTION
SOIC-8
Package Pin #
DFN18
Package Pin #
Pin Symbol
Function
1
1
BOOST
The BOOST pin provides additional drive voltage to the on-chip NPN
power transistor. The resulting decrease in switch on voltage increases
efficiency.
2
2, 3, 4
VIN
This pin is the main power input to the IC.
3
5, 6, 7
VSW
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.
4
(CS51412/CS51414)
8
BIAS
The BIAS pin connects to the on-chip power rail and allows the IC to run
most of its internal circuitry from the regulated output or another low
voltage supply to improve efficiency. The BIAS pin is left floating if this
feature is not used.
5
(CS51411/CS51413)
10
SYNC
This pin provides the synchronization input.
5
(CS51412/CS51414)
4
(CS51411/CS51413)
10
(CS51412/CS51414)
8
(CS51411/CS51413)
SHDNB
The shutdown pin is active low and TTL compatible. The IC goes into
sleep mode, drawing less than 85
mA when the pin voltage is pulled
below 1.0 V. This pin should be left floating in normal position.
6
13
GND
Power return connection for the IC.
7
16
VFB
The FB pin provides input to the inverting input of the error amplifier. If
VFB is lower than 0.29 V, the oscillator frequency is divided by four, and
current limit folds back to about 1 A. These features protect the IC under
severe overcurrent or short circuit conditions.
8
17
VC
The VC pin provides a connection point to the output of the error
amplifier and input to the PWM 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.
-
9, 11, 12, 14, 15, 18
NC
No Connection


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