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LTC1546G, LTC1547CS, LTC1550

Table of contents:
Info of LTC1546G
Info of LTC1547CS
Info of LTC1550

LTC1546G, LTC1547CS, LTC1550 Selling Leads, Datasheet

MFG:LT Package Cooled:SMD D/C:new

LTC1546G, LTC1547CS, LTC1550 Datasheet download

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Part Number: LTC1546G

MFG: LT

Package Cooled: SMD

D/C: new

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LTC1550 General Description

The LTC®1550/LTC1551 are switched capacitor charge pump voltage inverters which include internal linear postregulators to minimize output ripple. Output voltages are fixed at 4.1V, with ripple voltages typically below 1mVP-P. The LTC1550 is also available in an adjustable output voltage version. The LTC1550/LTC1551 are ideal for use as bias voltage generators for GaAs transmitter FETs in portable RF and cellular telephone applications.

The LTC1550/LTC1551 operate from single 4.5V to 6.5V supplies and draw typical quiescent currents of 4.25mA with a 5V supply. Each device includes a TTL compatible Shutdown pin which drops supply current to 0.2mA typically. The LTC1550 Shutdown pin is active low (SHDN), while the LTC1551 Shutdown pin is active high (SHDN). Only four external components are required: an input bypass capacitor, two 0.1mF charge pump capacitors and a filter capacitor at the linear regulator output.

The adjustable LTC1550 requires two additional resistors to set the output voltage. The LTC1550/LTC1551 will supply up to 10mA output current with a 5V supply, while maintaining guaranteed output regulation of ±5%. The fixed voltage LTC1550/LTC1551 are available in S0-8 plastic packages. The adjustable LTC1550 is available in a 16-pin SSOP.

LTC1550 Maximum Ratings

Supply Voltage .............................................................. 7V
Output Voltage .................................. 0.3V to (VCC  14V)
Total Voltage, VCC to CPOUT ...................................... 14V
Input Voltage (SHDN Pin) ..............  0.3V to (VCC + 0.3V)
Input Voltage (REG Pin)................................  0.3V to 12V
Output Short-Circuit Duration ................................. 30 sec
Commercial Temperature Range ................. 0°C to 70°C
Extended Commercial Operating
Temperature Range (Note 3) .................  40°C to 85°C
Industrial Temperature Range ................  40°C to 85°C
Storage Temperature Range ................  65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C

LTC1550 Features

Regulated Negative Voltage from a Single Positive Supply
Low Output Ripple: Less Than 1mVP-P Typ
High Charge Pump Frequency: 900kHz Typ
Small Charge Pump Capacitors: 0.1mF
Requires Only Four External Capacitors
Fixed 4.1V or Adjustable Output
Shutdown Mode Drops Supply Current to < 1mA
High Output Current: Up to 10mA, VCC = 5V
Output Regulation: 5%
Available in SO-8 and 16-Lead SSOP

LTC1550 Typical Application

GaAs FET Bias Generators
Negative Supply Generators
Battery-Powered Systems
Single Supply Applications

LTC1550 Connection Diagram

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