Datasheet > LTC1551L

LTC1551L

更新时间： 2024-11-08 22:57:35

品牌	Logo	应用领域
凌特 - Linear		开关高压
页数	文件大小	规格书
12页	274K
描述
Low Noise, Switched Capacitor Regulated Voltage Inverters

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LTC1551L 数据手册

LTC1550L/LTC1551L

Low Noise, Switched

Capacitor Regulated

Voltage Inverters

DESCRIPTIO

FEATURES

The LTC^®1550L/LTC1551L are switched capacitor charge

pump voltage inverters which include internal linear post-

regulators to minimize output ripple. The LTC1550L fixed

output voltage versions include–4.1V, –2.5Vand–2Vwith

ripple voltages typically below 1mV_P-P. The LTC1550L is

also available in an adjustable output voltage version. The

LTC1550L/LTC1551L are ideal for use as bias voltage

generators for GaAs transmitter FETs in portable RF and

cellular telephone applications.

■

Regulated Negative Voltage from a Single

Positive Supply

■

Low Output Ripple: Less Than 1mV_P-PTyp

■

High Charge Pump Frequency: 900kHz

■

Small Charge Pump Capacitors: 0.1µF

■

Requires Only Four External Capacitors

■

Fixed –4.1V, –2.5V, –2V or Adjustable Output

■

Shutdown Mode Drops Supply Current to <1µA

■

High Output Current: Up to 20mA (Depending on

V_CCto V_OUTRange)

The LTC1550L/LTC1551L operate from single 2.7V to

5.5V supplies and draw typical quiescent currents of

3.5mA with a 5V supply. Each device includes a TTL

compatible Shutdown pin which drops supply current to

0.2µA typically. The LTC1550L Shutdown pin is active low

(SHDN), while the LTC1551L Shutdown pin is active high

(SHDN). Only four external components are required: an

inputbypasscapacitor, two 0.1µF charge pump capacitors

and a filter capacitor at the linear regulator output. The

adjustable LTC1550L/LTC1551L require two additional re-

sistors to set the output voltage. The LTC1550L/LTC1551L

will supply up to 20mA (depending on V_CCto V_OUTrange),

while maintaining guaranteed output regulation of ±2.5%.

■

Output Regulation: 2.5% Over Line, Load and

Temperature

■

Available in 8-Lead MSOP, 8-Lead Narrow SO and

16-Lead Narrow SSOP

APPLICATIO S

■

GaAs FET Bias Generators

■

Negative Supply Generators

■

Battery-Powered Systems

Single Supply Applications

■

Both fixed voltage and adjustable LTC1550L/LTC1551L

are available in 8-lead MSOP and SO plastic packages: the

adjustable LTC1550L is also available in a 16-pin SSOP

with the REG pin.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

V_OUTOutput Noise and Ripple

10k

3.6V

POWER VALID

SHDN

REG

OUT

2.2µF

0.1µF

V_OUT

AC COUPLED

2mV/DIV

LTC1550L-2

GND

–

OUT

LOAD

= –2V

= 5mA

OUT

10µF

0.1µF

1550L/51L TA01

5µs/DIV

1550L/51L TA01a

Figure 1. –2V Generator with 1mV_P-PNoise

12 3 4 5 6 7...12

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与LTC1551L相关器件

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LTC1551L_15	Linear	获取价格	Low Noise, Switched Capacitor Regulated Voltage Inverters
LTC1551LCMS8	Linear	获取价格	Low Noise, Switched Capacitor Regulated Voltage Inverters
LTC1551LCMS8#PBF	Linear	获取价格	LTC1551L - Low Noise, Switched Capacitor Regulated Voltage Inverters; Package: MSOP; Pins:
LTC1551LCMS8#TR	Linear	获取价格	LTC1551L - Low Noise, Switched Capacitor Regulated Voltage Inverters; Package: MSOP; Pins:
LTC1551LCMS8#TRPBF	Linear	获取价格	LTC1551L - Low Noise, Switched Capacitor Regulated Voltage Inverters; Package: MSOP; Pins:
LTC1551LCMS8-4.1	Linear	获取价格	Low Noise, Switched Capacitor Regulated Voltage Inverters
LTC1551LCMS8-4.1#PBF	Linear	获取价格	LTC1551L - Low Noise, Switched Capacitor Regulated Voltage Inverters; Package: MSOP; Pins:
LTC1551LCMS8-4.1#TR	Linear	获取价格	LTC1551L - Low Noise, Switched Capacitor Regulated Voltage Inverters; Package: MSOP; Pins:
LTC1551LCMS8-4.1#TRPBF	Linear	获取价格	LTC1551L - Low Noise, Switched Capacitor Regulated Voltage Inverters; Package: MSOP; Pins:
LTC1551LCS8	Linear	获取价格	Low Noise, Switched Capacitor Regulated Voltage Inverters

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