LTC3251EMSE#TR datasheet, PDF - EEWORLD Datasheet

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LTC3251EMSE#TR: DescriptionIC reg buck switched cap 10msop; CategoryPower/power management The power supply circuit; File Size401KB，11 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC3251EMSE#TR Overview

IC reg buck switched cap 10msop

LTC3251EMSE#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	MSOP
package instruction	HTSSOP, TSSOP10,.19,20
Contacts	10
Manufacturer packaging code	MSE
Reach Compliance Code	not_compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHED CAPACITOR REGULATOR
Maximum input voltage	5.5 V
Minimum input voltage	2.7 V
Nominal input voltage	3.6 V
JESD-30 code	S-PDSO-G10
JESD-609 code	e0
length	3 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	10
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	0.65 A
Package body material	PLASTIC/EPOXY
encapsulated code	HTSSOP
Encapsulate equivalent code	TSSOP10,.19,20
Package shape	SQUARE
Package form	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	235
Certification status	Not Qualified
Maximum seat height	1.1 mm
surface mount	YES
Switch configuration	DOUBLER INVERTER
Maximum switching frequency	2000 kHz
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.5 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
width	3 mm

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506

500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER

LTC3251EMSE

DESCRIPTION

Demonstration circuit 506A is a two-phase,

step down charge pump DC/DC converter

featuring the LTC3251EMSE. It produces regu-

lated 1.5V output voltage at up to 500mA of

output current from 3.2V to 5.5V input. A

unique two phase, spread spectrum architec-

ture of the LTC3251 provides highly efficient

and low noise operation. The burst and super-

burst operating modes also reduce operating

current at light load conditions. The circuit has

a low external parts count and requires only

four small surface mount capacitors. DC 506

demonstrates appropriate layout techniques

for the LTC3251 Inductorless DC-DC converter.

This power supply circuit is ideally suited for

space-constrained battery-powered applica-

tions that require small size and low operating

current.

Design files for this circuit board are available.

Call the LTC factory.

QUICK START PROCEDURE

Demonstration circuit DC506 is easy to set up

to evaluate the performance of the LTC3251.

Refer to Figure 1 for proper measurement

equipment setup and follow the procedure

below:

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

NOTE:

When measuring the input or output

Check for the proper output voltages. VOUT

= 1.5V.

If there is no output, temporarily disconnect

the load to make sure that the load is not

set too high.

Once

the proper output voltages are

established, adjust the loads up to 500mA

and observe the output voltage regulation,

input and output ripple voltage, efficiency

and other parameters.

NOTE:

IOUT derates linearly to 200mA for VIN

power off, connect input power

source to VIN and GND terminals. Input

voltage range is limited to between 3.2V

and 5.5V.

in the GND position, JP2 in the VIN position

for Burst Mode operation.

terminals.

less than 3.5V.

For continuous mode operation, set opera-

Place operation mode selector jumper JP1

tion mode selector jumper JP1 in the VIN

position, JP2 in the GND position. Please re-

fer Table1 for other modes of operation.

Table 1. Modes of Operation:

JP1

GND

VIN

JP2

GND

VIN

GND

VIN

MODE

SHUTDOWN

BURST

CONTINUOUS

SUPER BURST

Connect load between the VOUT and GND

Turn on the power at the input.

not exceed 5.5V.

NOTE:

Make sure that the input voltage does

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Description	IC reg buck switched cap 10msop	IC reg buck switched cap 10msop	board eval for ltc3251emse	IC reg buck switched cap 10msop	IC REG SWITCHD CAP 1.2V 10MSOP	IC REG SWITCHD CAP 1.5V 10MSOP	IC REG SWITCHD CAP 1.2V 10MSOP	IC REG SWITCHD CAP ADJ 10MSOP	IC REG SWITCHD CAP 1.5V 10MSOP	IC REG SWITCHD CAP ADJ 10MSOP
Brand Name	Linear Technology	Linear Technology	-	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	incompatible	incompatible	-	incompatible	conform to	conform to	conform to	conform to	conform to	conform to
Maker	Linear ( ADI )	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	MSOP	MSOP	-	MSOP	MSOP	MSOP	MSOP	MSOP	MSOP	MSOP
package instruction	HTSSOP, TSSOP10,.19,20	PLASTIC, MSOP-10	-	PLASTIC, MSOP-10	HTSSOP, TSSOP10,.19,20	HTSSOP, TSSOP10,.19,20	HTSSOP, TSSOP10,.19,20	HTSSOP, TSSOP10,.19,20	HTSSOP, TSSOP10,.19,20	HTSSOP, TSSOP10,.19,20
Contacts	10	10	-	10	10	10	10	10	10	10
Manufacturer packaging code	MSE	MSE	-	MSE	MSE	MSE	MSE	MSE	MSE	MSE
Reach Compliance Code	not_compliant	not_compliant	-	not_compliant	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	-	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHED CAPACITOR REGULATOR	SWITCHED CAPACITOR REGULATOR	-	SWITCHED CAPACITOR REGULATOR	SWITCHED CAPACITOR REGULATOR	SWITCHED CAPACITOR REGULATOR	SWITCHED CAPACITOR REGULATOR	SWITCHED CAPACITOR REGULATOR	SWITCHED CAPACITOR REGULATOR	SWITCHED CAPACITOR REGULATOR
Maximum input voltage	5.5 V	5.5 V	-	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V
Minimum input voltage	2.7 V	2.7 V	-	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V
Nominal input voltage	3.6 V	3.6 V	-	3.6 V	3.6 V	3.6 V	3.6 V	3.6 V	3.6 V	3.6 V
JESD-30 code	S-PDSO-G10	S-PDSO-G10	-	S-PDSO-G10	S-PDSO-G10	S-PDSO-G10	S-PDSO-G10	S-PDSO-G10	S-PDSO-G10	S-PDSO-G10
JESD-609 code	e0	e0	-	e0	e3	e3	e3	e3	e3	e3
length	3 mm	3 mm	-	3 mm	3 mm	3 mm	3 mm	3 mm	3 mm	3 mm
Humidity sensitivity level	1	1	-	1	1	1	1	1	1	1
Number of functions	1	1	-	1	1	1	1	1	1	1
Number of terminals	10	10	-	10	10	10	10	10	10	10
Maximum operating temperature	70 °C	70 °C	-	70 °C	70 °C	70 °C	70 °C	70 °C	70 °C	70 °C
Maximum output current	0.65 A	0.65 A	-	0.65 A	0.65 A	0.65 A	0.65 A	0.65 A	0.65 A	0.65 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HTSSOP	HTSSOP	-	HTSSOP	HTSSOP	HTSSOP	HTSSOP	HTSSOP	HTSSOP	HTSSOP
Encapsulate equivalent code	TSSOP10,.19,20	TSSOP10,.19,20	-	TSSOP10,.19,20	TSSOP10,.19,20	TSSOP10,.19,20	TSSOP10,.19,20	TSSOP10,.19,20	TSSOP10,.19,20	TSSOP10,.19,20
Package shape	SQUARE	SQUARE	-	SQUARE	SQUARE	SQUARE	SQUARE	SQUARE	SQUARE	SQUARE
Package form	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	-	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	235	235	-	235	260	260	260	260	260	260
Certification status	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.1 mm	1.1 mm	-	1.1 mm	1.1 mm	1.1 mm	1.1 mm	1.1 mm	1.1 mm	1.1 mm
surface mount	YES	YES	-	YES	YES	YES	YES	YES	YES	YES
Switch configuration	DOUBLER INVERTER	DOUBLER INVERTER	-	DOUBLER INVERTER	DOUBLER INVERTER	DOUBLER INVERTER	DOUBLER INVERTER	DOUBLER INVERTER	DOUBLER INVERTER	DOUBLER INVERTER
Maximum switching frequency	2000 kHz	2000 kHz	-	2000 kHz	2000 kHz	2000 kHz	2000 kHz	2000 kHz	2000 kHz	2000 kHz
technology	CMOS	CMOS	-	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	COMMERCIAL	COMMERCIAL	-	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	-	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	-	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	0.5 mm	0.5 mm	-	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm
Terminal location	DUAL	DUAL	-	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	20	20	-	20	30	30	30	30	30	30
width	3 mm	3 mm	-	3 mm	3 mm	3 mm	3 mm	3 mm	3 mm	3 mm
Nominal output voltage	-	1.2 V	-	1.5 V	1.2 V	1.5 V	1.2 V	-	1.5 V	-

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