LTC1550L Просмотр технического описания (PDF) - Linear Technology

Номер в каталоге

Компоненты Описание

производитель

LTC1550L

Low Noise, Switched Capacitor Regulated Voltage Inverters

Linear Technology 

BLOCK DIAGRAM

CLK

900kHz

*SHDN

CCP

VCC

CPOUT

S1

S4

C1+

C1

S2

C1–

LINEAR

REGULATOR

S3

CHARGE

PUMP

58mV

1.225V

1.167V

*SHDN FOR LTC1550L, SHDN FOR LTC1551L

** FIXED OUTPUT VERSIONS ONLY

LTC1550L/LTC1551L

**

**

+

COMP2

–

COUT

VOUT

ADJ

REG

1550L/51L BD

APPLICATIONS INFORMATION

OVERVIEW

The LTC1550L/LTC1551L are switched capacitor, inverting

charge pumps with internal linear post-regulators. The

LTC1550L/LTC1551L provide a regulated, low ripple output

at up to 20mA load current with the appropriate input

voltage as output load current depends on the input/

output voltage combination. Consult the graph provided in

the Typical Performance Characteristics section and the

Electrical Characteristics table for guaranteed test points.

The LTC1550L/LTC1551L are ideal for use as bias voltage

generators for GaAs transmitter FETs in portable RF and

cellular telephone applications. The LTC1550L features an

active-low Shutdown pin (SHDN) that drops quiescent

current to below 1µA. The LTC1551L is identical to the

LTC1550L, except that the Shutdown pin is active-high

(SHDN). All members of the LTC1550L/LTC1551L family

feature a 900kHz charge pump frequency. The LTC1550L/

LTC1551L come standard with fixed – 4.1V, –2.5V, –2V

and adjustable output voltages. The LTC1550L/LTC1551L

can be configured for other fixed output voltages; contact

Linear Technology for more information.

7

Share Link: