LT1054MH

Manufacturer Part NumberLT1054MH
DescriptionCAN-8
ManufacturerLinear Technology Corporation
LT1054MH datasheets
 
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FEATURE
S
Available in Space Saving SO-8 Package
Output Current: 100mA (LT1054)
125mA (LT1054L)
Low Loss: 1.1V at 100mA
Operating Range:3.5V to 15V (LT1054)
3.5V to 7V (LT1054L)
Reference and Error Amplifier for Regulation
External Shutdown
External Oscillator Synchronization
Can Be Paralleled
®
Pin Compatible with the LTC
1044/LTC7660
O
U
A
PPLICATI
S
Voltage Inverter
Voltage Regulator
Negative Voltage Doubler
Positive Voltage Doubler
, LTC and LT are registered trademarks of Linear Technology Corporation.
W
BLOCK
DIAGRAM
V
REF
6
2.5V
REFERENCE
R
+
1
OSC
FEEDBACK/
SHUTDOWN
7
R
OSC
*EXTERNAL CAPACITORS
Switched-Capacitor Voltage
Converter with Regulator
D
ESCRIPTIO
®
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 100 A.
The internal oscillator of the LT1054 runs at a nominal
frequency of 25kHz. The oscillator pin can be used to adjust
the switching frequency or to externally synchronize the
LT1054.
The LT1054 is pin compatible with previous converters
such the LTC1044/LTC7660.
V
IN
8
DRIVE
+
CAP
2
+
C
*
IN
Q
Q
CAP
4
DRIVE
DRIVE
3
GND
+
C
*
OUT
–V
5
OUT
DRIVE
LT1054 • BD
LT1054/LT1054L
U
LT1054/LT1054L Voltage Loss
2
3.5V V
15V (LT1054)
IN
3.5V V
7V (LT1054L)
LT1054L
IN
C
= C
= 100 F
IN
OUT
INDICATES GUARANTEED
TEST POINT
LT1054
1
T
= 125 C
J
T
= 25 C
J
T
= –55 C
J
0
0
25
50
75
100
125
OUTPUT CURRENT (mA)
1054 TA01•
1