Switched Capacitor Voltage Converter - Linear Technology Corporation
Description
LT1054/LT1054L Switched-Capacitor Voltage Converter with Regulator FEATURES
Available in Space Saving SO-8 Package s Output Current: 100mA (LT1054) 125mA (LT1054L) s Low Loss: 1.
1V at 100mA s Operating Range:3.
5V to 15V (LT1054) www.
DataSheet4U.
com 3.
5V to 7V (LT1054L) s Reference and Error Amplifier for Regulation s External Shutdown s External Oscillator Synchronization s Can Be Paralleled s Pin Compatible with the LTC®1044/LTC7660
s
DESCRIPTIO
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 previously 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 adjust the switching frequency or to externally synchronize the LT1054.
The LT1054 is pin compatible with previous converters such the LTC1044/LTC7660.
APPLICATI
s s s s
S
Voltage Inverter Voltage Regulator Negative Voltage Doubler Positive Voltage Doubler
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK DIAGRAM
VREF 6 2.
5V R
VIN 8
2
REFERENCE
DRIVE
VOLTAGE LOSS (V)
+
1 FEEDBACK/ SHUTDOWN
CAP + 2
+ –
OSC R 7 OSC Q Q CAP – 4 DRIVE DRIVE 3 GND *EXTERNAL CAPACITORS CIN*
1 TJ = 125°C TJ = 25°C TJ = –55°C 0
+
COUT* 5 –VOUT DRIVE
LT105...
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