CS5112YDWF24 ONSEMI [ON Semiconductor], CS5112YDWF24 Datasheet - Page 8

• Manufacturer Part Number: CS5112YDWF24
• Description: 1.4 A Switching Regulator with 5.0 V, 100 mA Linear Regulator with Watchdog, RESET and ENABLE
• Manufacturer: ONSEMI [ON Semiconductor]

V
V
I
I
Peak
Peak
OUT
V
SAT
0
0
0
IN
V
I
Figure 12. Voltage and Current Waveforms
SW
I
SW
D
I
R
64.9 kW
BIAS
Figure 11. Block Diagram of the 1.4 A Current Mode Control Switching Regulator Portion of the
V
BIAS
C
LIN
OSC
for Boost Topology in CS5112
Oscillator
COMP
Switcher
Error
Amplifier
COMP
Current Sense Amplifier
CS5112 in a Boost Configuration
ENABLE
http://onsemi.com
−
+
Logic
t
t
t
CS5112
+
−
8
Multiplexer
excessive power dissipation in the linear output transistor
over the output range of 0 V to regulation. Also, the current
into V
function in the switcher output transistor.
to excessive ambient temperature or excessive power
dissipation, the drive to the linear output transistor is
reduced proportionally with increasing die temperature.
Therefore, V
temperature above 160°C. Since the switcher control
circuitry is powered through V
performance, including current limit, will be affected by the
decrease in V
Switcher Shutdown
The current out of V
If the die temperature is increased above 160°C, either due
+
−
1.25 V
SW
Base Drive
is sensed in order to provide the current limit
LIN
LIN
PROTECTION CIRCUITRY
.
V
V
FB1
FB2
will decrease with increasing die
SELECT
Reference
1.4 A
R
Bandgap
LIN
V
V
S
SW
IN
is sensed in order to limit
GND
C
LIN
OUT
, the switcher
R
R
R
V
1
2
3
OUT