LT3502IMS#PBF datasheet, PDF - EEWORLD Datasheet

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LT3502IMS#PBF: DescriptionIC REG BUCK ADJ 0.5A 10MSOP; CategoryPower/power management The power supply circuit; File Size217KB，3 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LT3502IMS#PBF Overview

IC REG BUCK ADJ 0.5A 10MSOP

LT3502IMS#PBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	MSOP
package instruction	TSSOP, TSSOP10,.19,20
Contacts	10
Manufacturer packaging code	MS
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	40 V
Minimum input voltage	3 V
Nominal input voltage	10 V
JESD-30 code	S-PDSO-G10
JESD-609 code	e3
length	3 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	10
Maximum operating temperature	125 °C
Minimum operating temperature	-40 °C
Maximum output current	1.1 A
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Encapsulate equivalent code	TSSOP10,.19,20
Package shape	SQUARE
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	250
Certification status	Not Qualified
Maximum seat height	1.1 mm
surface mount	YES
Switch configuration	BUCK
Maximum switching frequency	1400 kHz
technology	BIPOLAR
Temperature level	AUTOMOTIVE
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	0.5 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3 mm

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DC1221B

QUICK START LT3502

GUIDE

LT3502

1.1MHz, 500mA, Step-down Regulator in

2mm×2mm DFN

DESCRIPTION

Demo circuit DC1221B is a monolithic step-down DC/DC

switching regulator featuring the LT3502. The demo cir-

cuit is designed for 3.3V output from a 4.5V to 40V in-

put. The wide input range of the LT3502 allows a variety

of input sources including automotive batteries and 24V

industrial supplies. The high switching frequency allows

the use of tiny, low cost external components. The cur-

rent mode control scheme creates fast transient re-

sponse and good loop stability. The boost diode is inter-

nal to reduce component count. The SHDN pin can also

be used to program soft start. In this mode, the SHDN

pin is driven through an external RC filter to create a

voltage ramp on this pin. The soft start function reduces

the input current surge during start-up. Cycle by cycle

current limit and frequency foldback provide the protec-

tion against shorted outputs. DA pin can further protect

the silicon under fault conditions by sensing the diode

current.

The LT3502 datasheet gives a complete description of

the part, operation and application information. The data-

sheet must be read in conjunction with this quick start

guide for demo circuit DC1221B.

Design files for this circuit board are available. Call

the LTC factory.

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

Performance Summary (TA = 25oC)

PARAMETER

Minimum Input Voltage

Maximum Input Voltage

Output Voltage V

OUT

Switching Frequency

Maximum Output Current

Efficiency

Voltage Ripple

CONDITION

VALUE

4.5V

40V

3.328V ±2.8%

1.1MHz ±18%

500mA

80%

10mV

=12V, I

out

=500mA

=12V, I

out

=500mA

QUICK START PROCEDURE

Demonstration circuit 1221B is easy to set up to evaluate

the performance of the LT3502. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

NOTE.

When measuring the input or output voltage ripple, care must be

taken to avoid a long ground lead on the oscilloscope probe. Measure the

input or output voltage ripple by touching the probe tip directly across the

Vin or Vout and GND terminals. See Figure 2 for proper scope probe

technique.

With

power off, connect the input power supply to Vin

and GND.

NOTE.

Make sure that the input voltage does not exceed 40V.

Turn on the power at the input.

Check for the proper output voltages.

NOTE.

If there is no output, temporarily disconnect the load to make

sure that the load is not set too high.

Place JP1 on the ON position.

Once

the proper output voltage is established, adjust

the load within the operating range and observe the

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