LTC3541
3541fa
PERATIO
The LTC3541 contains a high efficiency synchronous
buck converter, a very low dropout regulator (VLDO) and
a linear regulator. It can be used to provide up to two
output voltages from a single input voltage making the
LTC3541 ideal for applications with limited board space.
The combination and configuration of these major blocks
within the LTC3541 is determined by way of the control
pins ENBUCK and ENVLDO as defined in Table 1.
With the ENBUCK pin driven to a logic high and ENVLDO
driven to a logic low, the LTC3541 enables the buck con-
verter to efficiently reduce the voltage provided at the V
IN
input pin to an output voltage which is set by an external
feedback resistor network. The buck regulator can be con-
fgured for Pulse-Skip or Burst Mode operation by driving
the MODE pin to a logic high or logic low respectively. The
buck regulator is capable of providing a maximum output
current of 500mA, which must be taken into consideration
when using the buck regulator to provide the power for
both the VLDO and for external loads.
With the ENBUCK pin driven to a logic low and ENVLDO
driven to a logic high, the LTC3541 enables the linear
regulator, providing a low noise regulated output voltage
at the LV
OUT
pin while drawing minimal quiescent current
from the V
IN
input pin. This feature allows output voltage
LV
OUT
to be brought into regulation without the presence
of the LV
IN
voltage.
With the ENBUCK and ENVLDO pins both driven to a
logic high, the LTC3541 enables the high efficiency buck
converter and VLDO regulator, providing dual output opera-
tion from a single input voltage. When configured in this
manner, the LTC3541s auto start-up sequencing feature
will bring the buck output into regulation in a controlled
manner prior to enabling the VLDO regulator without the
U CTIO AL BLOCK DIAGRA
U U
+
VLDO/LINEAR REG
LFB
3541 F01
PGND
GND
500mA BUCK
SW
V
IN
REF
ENVLDO
MODE
FB
GND PGND
REF
REF
LFB
CNTRL
GND
LV
IN
V
IN
CONTROL
LOGIC
4
LV
IN
6
BUCKFB
I
OUT(BUCK)
= 500mA
LV
OUT
5
8
ENBUCK
V
IN
IN(MIN)
e LV
OUT
+ 1.4V
SW
1
10
10礔
22pF
2.2礔
LV
OUT(MAX)
< V
IN
1.4V
I
OUT
= 300mA (VLDO REG)
I
OUT
= 30mA (LINEAR REG)
2.2礖
11
7
3
2
9
Figure 1. LTC3541 Functional Block Diagram
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