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.
The LT1054 also provides regulation, a feature not previ-
ously available in switched-capacitor voltage converters. 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.
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.
The LT1054 is pin compatible with previous converters
such the LTC1044/ICL7660.
■
■
■
■
■
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
Pin Compatible with the LTC
®
1044/ICL7660
Available in SW16 and SO-8 Packages
APPLICATIONS
■
■
■
■
Voltage Inverter
Voltage Regulator
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.
BLOCK DIAGRAM
V
REF
6
2.5V
R
DRIVE
V
IN
8
REFERENCE
2
LT1054/LT1054 Voltage Loss
3.5V ≤ V
IN
≤ 15V (LT1054)
3.5V ≤ V
IN
≤ 7V (LT1054L)
C
IN
= C
OUT
= 100µF
INDICATES GUARANTEED
TEST POINT
LT1054
LT1054L
+
1
FEEDBACK/
SHUTDOWN
–
R
7
OSC
Q
OSC
Q
CAP
–
4
C
IN
*
VOLTAGE LOSS (V)
+
CAP
+
2
1
DRIVE
DRIVE
3 GND
T
J
= 125°C
T
J
= 25°C
T
J
= –55°C
0
*EXTERNAL CAPACITORS
+
C
OUT
*
0
25
5 –V
OUT
DRIVE
LT1054 • BD
50
75
100
OUTPUT CURRENT (mA)
125
1054 TA01•
1954lfg
1
LINER [ LINEAR TECHNOLOGY ]
