LTC1550LCMS8-2#TR datasheet, PDF

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LTC1550LCMS8-2#TR: DescriptionIC reg switchd cap inv -2V 8msop; CategoryPower/power management The power supply circuit; File Size235KB，12 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC1550LCMS8-2#TR Overview

IC reg switchd cap inv -2V 8msop

LTC1550LCMS8-2#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	MSOP
package instruction	TSSOP,
Contacts	8
Manufacturer packaging code	MS8
Reach Compliance Code	_compli
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHED CAPACITOR REGULATOR
Maximum input voltage	5.25 V
Minimum input voltage	2.7 V
Nominal input voltage	5 V
JESD-30 code	S-PDSO-G8
JESD-609 code	e0
length	3 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Package shape	SQUARE
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	235
Certification status	Not Qualified
Maximum seat height	1.17 mm
surface mount	YES
Switch configuration	DOUBLER INVERTER
Maximum switching frequency	900 kHz
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
width	3 mm

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LTC1550L/LTC1551L

Low Noise, Switched

Capacitor Regulated

Voltage Inverters

FEATURES

DESCRIPTIO

Regulated Negative Voltage from a Single

Positive Supply

Low Output Ripple: Less Than 1mV

P-P

Typ

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

to V

OUT

Range)

Output Regulation: 2.5% Over Line, Load and

Temperature

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

16-Lead Narrow SSOP

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, –2.5V and –2V with

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.

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

input bypass capacitor, 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

to V

OUT

range),

while maintaining guaranteed output regulation of

±2.5%.

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.

OUT

Output Noise and Ripple

APPLICATIO S

GaAs FET Bias Generators

Negative Supply Generators

Battery-Powered Systems

Single Supply Applications

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

TYPICAL APPLICATIO

3.6V

SHDN

OUT

REG

OUT

10k

POWER VALID

2.2µF

LTC1550L-2

GND

–

0.1µF

OUT

AC COUPLED

2mV/DIV

0.1µF

OUT

10µF

OUT

= –2V

LOAD

= 5mA

0.1µF

1550L/51L TA01

Figure 1. – 2V Generator with 1mV

P-P

Noise

5µs/DIV

1550L/51L TA01a

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