LTC1503CS8-1.8#TR datasheet, PDF

Datasheet> All Categories > Power/power management> The power supply circuit> LTC1503CS8-1.8#TR

LTC1503CS8-1.8#TR: DescriptionIC reg buck switched cap 8soic; CategoryPower/power management The power supply circuit; File Size92KB，2 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC1503CS8-1.8#TR Overview

IC reg buck switched cap 8soic

LTC1503CS8-1.8#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SOIC
package instruction	SOP, SOP8,.25
Contacts	8
Manufacturer packaging code	S8
Reach Compliance Code	_compli
ECCN code	EAR99
Analog Integrated Circuits - Other Types	DC-DC REGULATED POWER SUPPLY MODULE
Maximum input voltage	6 V
Minimum input voltage	2.4 V
JESD-30 code	R-PDSO-G8
JESD-609 code	e0
length	4.9 mm
Humidity sensitivity level	1
Number of functions	1
Output times	1
Number of terminals	8
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	0.1 A
Maximum output voltage	1.872 V
Minimum output voltage	1.728 V
Nominal output voltage	1.8 V
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	235
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
Fine-tuning/adjustable output	NO
width	3.9 mm

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DC250A Quick Start Guide

The DC250A demonstration board contains all of the circuitry needed for evaluation of the

LTC1503CMS8-1.8/2 inductorless switching regulator IC. To begin, simply connect an input

power supply to V

(E3) and GND (E4) (see Figure 1). Connect the load between V

OUT

(E2) and

GND (E4). Once power is applied, the LTC1503CMS-1.8/2 will start up automatically and produce

a regulated 1.8V/2V output voltage.

With an input supply of between 2.4V and 6V, the output will regulate correctly for any load

current up to 100mA. Accidental short circuits from V

OUT

to GND will not damage the

LTC1503CMS8-1.8/2 or DC250A demonstration board.

To place the LTC1503CMS8-1.8/2 in shutdown, simply connect the SHDN/SS pin (E5) to GND

(E4). To re-start the LTC1503CMS8-1.8/2 remove the ground connection from SHDN/SS. The IC

will automatically pull up on the SHDN/SS pin and regulate to the correct voltage at its output.

Inrush current can be controlled by the use of jumper JP1. If JP1 is in place, soft-start capacitor C3

is connected to the SHDN/SS pin. C3 limits the inrush current by limiting the dV/dt of the output

voltage upon start-up. Without JP1, the LTC1503CMS8-1.8/2 will deliver current to C

OUT

, the

output capacitor, as quickly as possible until the regulation voltage is reached.

To evaluate the soft-start feature of the LTC1503CMS8-1.8/2 an open-drain output from a

microcontroller or a discrete transistor can be connected to the SHDN/SS pin (E5). For example,

using a discrete transistor, connect the drain of the device to SHDN/SS (E5) and the source to GND

(E4). The gate can be manipulated to a suitable control voltage or pulsed waveform with a function

generator. To see the soft start characteristics on an oscilloscope, a load resistor will be needed to

discharge the output capacitor. A 33ohm resistor will discharge the 10µF output capacitor in about

1ms.

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