LT1054/LT1054L
Switched-Capacitor Voltage
Converter with Regulator
FEATURES
DESCRIPTION
The LT®1054 is a monolithic, bipolar, switched-capacitor
voltage converter and regulator. The LT1054 provides
higher output current than previously available converters
with significantly lower voltage losses. An adaptive switch
driver scheme optimizes efficiency over a wide range of
output currents. Total voltage loss at 100mA output current
is typically 1.1V. This holds true over the full supply voltage
range of 3.5V to 15V. Quiescent current is typically 2.5mA.
■ꢀ
Output Current: 100mA (LT1054)
125mA (LT1054L)
■
Reference and Error Amplifier for Regulation
■
Low Loss: 1.1V at 100mA
■
Operating Range:3.5V to 15V (LT1054)
3.5V to 7V (LT1054L)
■
External Shutdown
■
External Oscillator Synchronization
■
Can Be Paralleled
The LT1054 also provides regulation, a feature not previ-
ouslyavailableinswitched-capacitorvoltageconverters.By
adding an external resistive divider a regulated output can
be obtained. This output will be regulated against changes
in both input voltage and output current. The LT1054 can
also be shut down by grounding the feedback pin. Supply
current in shutdown is less than 100µA.
Pin Compatible with the LTC®1044/ICL7660
■
■
Available in SW16 and SO-8 Packages
APPLICATIONS
■
Voltage Inverter
■
Voltage Regulator
The internal oscillator of the LT1054 runs at a nominal
frequency of 25kHz. The oscillator pin can be used to ad-
just the switching frequency or to externally synchronize
the LT1054.
■
Negative Voltage Doubler
Positive Voltage Doubler
■
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
The LT1054 is pin compatible with previous converters
such the LTC1044/ICL7660.
BLOCK DIAGRAM
V
REF
6
V
IN
LT1054/LT1054 Voltage Loss
8
2
2.5V
3.5V ≤ V ≤ 15V (LT1054)
IN
REFERENCE
LT1054L
3.5V ≤ V ≤ 7V (LT1054L)
IN
R
DRIVE
CAP
C
= C
= 100µF
OUT
IN
INDICATES GUARANTEED
TEST POINT
+
–
+
–
2
4
+
C
*
LT1054
IN
Q
1
FEEDBACK/
SHUTDOWN
1
0
OSC
Q
CAP
7
R
T
T
T
= 125°C
= 25°C
= –55°C
J
J
J
OSC
DRIVE
DRIVE
DRIVE
3
5
GND
+
*EXTERNAL CAPACITORS
C
*
0
25
50
75
100
125
OUT
OUTPUT CURRENT (mA)
–V
OUT
1054 TA01•
LT1054 • BD
1954lfg
1