CS51411 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
View to exact match
CS51411 Datasheet PDF : 20 Pages
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CS51411, CS51412, CS51413, CS51414
PIN CONNECTIONS
CS51411/3
1
BOOST
8
VC
VIN
VSW
VFB
GND
SHDNB
SYNC
CS51412/4
1
BOOST
8
VC
VIN
VSW
VFB
GND
BIAS
SHDNB
CS51411/3
CS51412/4
BOOST 1
VIN
2
VIN
3
VIN
4
Vsw 5
VSW
6
VSW
7
SHDNB 8
NC 9
18 NC
17 VC
16
VFB
15 NC
14 NC
13 GND
12 NC
11 NC
10 SYNC
BOOST 1
VIN
2
VIN
3
VIN
4
Vsw 5
VSW
6
VSW
7
BIAS 8
NC 9
18 NC
17 VC
16
VFB
15 NC
14 NC
13 GND
12 NC
11 NC
10 SHDNB
PACKAGE PIN DESCRIPTION
SOIC-8
Package Pin #
DFN18
Package Pin #
1
1
2
2, 3, 4
3
5, 6, 7
4
8
(CS51412/CS51414)
5
(CS51411/CS51413)
10
5
(CS51412/CS51414)
4
(CS51411/CS51413)
10
(CS51412/CS51414)
8
(CS51411/CS51413)
6
13
7
16
8
17
-
9, 11, 12, 14, 15, 18
Pin Symbol
BOOST
VIN
VSW
BIAS
SYNC
SHDNB
GND
VFB
VC
NC
Function
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 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.
This pin provides the synchronization input.
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.
Power return connection for the IC.
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.
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.
No Connection
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