LTC1550IGN#TRPBF datasheet, PDF

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LTC1550IGN#TRPBF: DescriptionCharge Pump INV -1.5V/-2V/-2.5V/-3V/-3.5V/-4.1V/-4.5V 10mA 16-Pin SSOP N T/R; File Size272KB，12 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LTC1550IGN#TRPBF Overview

Charge Pump INV -1.5V/-2V/-2.5V/-3V/-3.5V/-4.1V/-4.5V 10mA 16-Pin SSOP N T/R

LTC1550IGN#TRPBF Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Function	Inverting
Output Type	Fixed
Output Voltage (V)	-1.5\|-2\|-2.5\|-3\|-3.5\|-4.1\|-4.5
Minimum Operating Supply Voltage (V)	2.7
Maximum Operating Supply Voltage (V)	6.5
Maximum Supply Current (mA)	7
Output Current (mA)	10(Max)
Switching Frequency (kHz)	900(Typ)
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	85
Supplier Temperature Grade	Industrial
Packaging	Tape and Reel
Pin Count	16
Standard Package Name	SOP
Supplier Package	SSOP N
Mounting	Surface Mount
Package Height	1.5(Max)
Package Length	4.98(Max)
Package Width	3.99(Max)
PCB changed	16
Lead Shape	Gull-wing

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LTC1550/LTC1551

Low Noise, Switched

Capacitor Regulated

Voltage Inverters

FEATURES

DESCRIPTION

The LTC

1550/LTC1551 are switched capacitor charge

pump voltage inverters which include internal linear post-

regulators to minimize output ripple. Output voltages are

fixed at – 4.1V, with ripple voltages typically below 1mV

P-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 0.2µA typi-

cally. 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 0.1µF 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.

Regulated Negative Voltage from a Single

Positive Supply

Low Output Ripple: Less Than 1mV

P-P

Typ

High Charge Pump Frequency: 900kHz Typ

Small Charge Pump Capacitors: 0.1µF

Requires Only Four External Capacitors

Fixed – 4.1V or Adjustable Output

Shutdown Mode Drops Supply Current to < 1µA

High Output Current: Up to 10mA, V

= 5V

Output Regulation: 5%

Available in SO-8 and 16-Lead SSOP

APPLICATIONS

GaAs FET Bias Generators

Negative Supply Generators

Battery-Powered Systems

Single Supply Applications

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

TYPICAL APPLICATION

– 4.1V Generator with 1mV

P-P

Noise

SHDN

OUT

SENSE

OUT

LTC1551

GND

–

FERRITE BEAD

OUT

10µF

OUT

= –4.1V

LOAD

= 5mA

0.1µF

1550/51 F01

OUT

Output Noise and Ripple

0.1µF

4.7µF

OUT

AC COUPLED

2mV/DIV

0.1µF

10µs/DIV

1550/51 TA02

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