LT1949-1EMS8#PBF datasheet, PDF

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LT1949-1EMS8#PBF: DescriptionIC REG BOOST SEPIC ADJ 1A 8MSOP; CategoryPower/power management The power supply circuit; File Size166KB，8 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LT1949-1EMS8#PBF Overview

IC REG BOOST SEPIC ADJ 1A 8MSOP

LT1949-1EMS8#PBF Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Parts packaging code	MSOP
package instruction	TSSOP,
Contacts	8
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	12 V
Minimum input voltage	1.7 V
Nominal input voltage	2 V
JESD-30 code	S-PDSO-G8
JESD-609 code	e3
length	3 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	1.5 A
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Package shape	SQUARE
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.1 mm
surface mount	YES
Switch configuration	BOOST
Maximum switching frequency	1350 kHz
Temperature level	INDUSTRIAL
Terminal surface	MATTE TIN
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	40
width	3 mm
Base Number Matches	1

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Final Electrical Specifications

LT1949-1

1.1MHz, 1A Switch

PWM DC/DC Converter

June 2000

DESCRIPTIO

FEATURES

1A, 0.5Ω, 30V Internal Switch

1.1MHz Fixed Frequency Operation

Operates with V

as Low as 1.5V

Low-Battery Detector Stays Active in Shutdown

Low V

CESAT

Switch: 410mV at 800mA

Pin-for-Pin Compatible with the LT1317B

Uses Ceramic Capacitors

Small 8-Lead MSOP Package

APPLICATIO S

The LT

1949-1 is a fixed frequency step-up DC/DC con-

verter with a 1A, 0.5Ω internal switch. Capable of gener-

ating 10V at 175mA from a 3.3V input, the LT1949-1 is

ideal for generating bias voltages for large screen LCD

panels. Constant frequency 1.1MHz operation results in a

low noise output that is easy to filter and the 30V switch

rating allows output voltage up to 28V using a single

inductor. The high switching frequency allows the use of

ceramic output capacitors. An external compensation pin

gives the user flexibility in optimizing loop compensation,

allowing small, low ESR ceramic capacitors to be used at

the output. The 8-lead MSOP package ensures a low

profile overall solution.

The LT1949-1 includes a low-battery detector that stays

alive when the device goes into shutdown. Quiescent

current in shutdown is 50µA, while operating current is

8mA.

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

LCD Bias Supplies

GPS Receivers

Battery Backup

Portable Electronic Equipment

Diagnostic Medical Instrumentation

TYPICAL APPLICATIO

3.3V

3.3µF

CERAMIC

SHUTDOWN

LT1949-1

SHDN

84.5k

50pF

4.7µH

OUT

= 10V

EFFICIENCY (%)

OUT

10V

175mA

196k

GND

3pF

28k

3.3µF

CERAMIC

C1, C2: TAIYO YUDEN LMK325BJ335MD

D1: MBRM120LT3

L1: SUMIDA CLQ4D10-4R7

1949-1 F01

Figure 1. 3.3V to 10V/175mA DC/DC Converter

Figure 2. 3.3V to 10V Converter Efficiency

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

3.6V

4.2V

100

LOAD CURRENT (mA)

300

1949-1 F02

LT1949-1EMS8#PBF Related Products

	LT1949-1EMS8#PBF	LT1949-1EMS8TR	LT1949-1EMS8#TRPBF
Description	IC REG BOOST SEPIC ADJ 1A 8MSOP	IC reg boost adj 1A 8msop	IC REG BOOST SEPIC ADJ 1A 8MSOP

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