LTC1625C datasheet, PDF - EEWORLD Datasheet

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LTC1625C: Description2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16; Categorysemiconductor Analog mixed-signal IC; File Size345KB，24 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC1625C Overview

2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16

LTC1625C Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	16
Rated input voltage	15 V
Maximum limit input voltage	36 V
Minimum limit input voltage	3.9 V
Maximum operating temperature	85 Cel
Minimum operating temperature	-40 Cel
Processing package description	PLASTIC, SO-16
state	ACTIVE
Craftsmanship	CMOS
packaging shape	RECTANGULAR
Package Size	SMALL OUTLINE
surface mount	Yes
Terminal form	GULL WING
Terminal spacing	1.27 mm
terminal coating	TIN LEAD
Terminal location	DUAL
Packaging Materials	PLASTIC/EPOXY
Temperature level	INDUSTRIAL
control mode	PEAK CURRENT
Control Technology	PULSE WIDTH MODULATION
Maximum output current	2 A
Analog IC other types	SWITCHING CONTROLLER
Switch configuration	BUCK
Maximum switching frequency	150 kHz

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LTC1625

No R

SENSE

Current Mode

Synchronous Step-Down

Switching Regulator

FEATURES

DESCRIPTION

The LTC

1625 is a synchronous step-down switching

regulator controller that drives external N-Channel power

MOSFETs using few external components. Current mode

control with MOSFET V

sensing eliminates the need for

a sense resistor and improves efficiency. The frequency of

a nominal 150kHz internal oscillator can be synchronized

to an external clock over a 1.5:1 frequency range.

Burst Mode

operation at low load currents reduces

switching losses and low dropout operation extends oper-

ating time in battery-powered systems. A forced continu-

ous mode control pin can assist secondary winding

regulation by disabling Burst Mode operation when the

main output is lightly loaded.

Fault protection is provided by foldback current limiting

and an output overvoltage comparator. An external ca-

pacitor attached to the RUN/SS pin provides soft start

capability for supply sequencing. A wide supply range

allows operation from 3.7V (3.9V for LTC1625I) to 36V at

the input and 1.19V to V

at the output.

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

No R

SENSE

and Burst Mode are trademarks of Linear Technology Corporation.

Highest Efficiency Current Mode Controller

No Sense Resistor Required

Stable High Current Operation

Dual N-Channel MOSFET Synchronous Drive

Wide V

Range: 3.7V to 36V

Wide V

OUT

Range: 1.19V to V

±1%

1.19V Reference

Programmable Fixed Frequency with Injection Lock

Very Low Drop Out Operation: 99% Duty Cycle

Forced Continuous Mode Control Pin

Optional Programmable Soft Start

Pin Selectable Output Voltage

Foldback Current Limit

Output Overvoltage Protection

Logic Controlled Micropower Shutdown: I

< 30µA

Available in 16-Lead Narrow SSOP and SO Packages

APPLICATIONS

Notebook and Palmtop Computers, PDAs

Cellular Telephones and Wireless Modems

Battery Chargers

Distributed Power

TYPICAL APPLICATION

Efficiency vs Load Current

SYNC

0.1µF

RUN/SS

LTC1625

10k

2.2nF

BOOST

PROG

INTV

SGND

CMDSH-3

0.22µF

VCC

4.7µF

MBRS140T3

Si4410DY

10µH

10µF

30V

5V TO

28V

100

= 10V

OUT

= 5V

OUT

3.3V

OUT

4.5A

100µF

10V

EFFICIENCY (%)

OSENSE

PGND

1625 F01

Figure 1. High Efficiency Step-Down Converter

OUT

= 3.3V

0.01

0.1

LOAD CURRENT (A)

1625 TA01

LTC1625C Related Products

	LTC1625C	LTC1625IS	LTC1625IGN	LTC1625I	LTC1625CS	LTC1625CGN	LTC1625
Description	2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16	2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16	2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16	2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16	2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16	2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16	2 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO16
Number of functions	1	1	1	1	1	1	1
Number of terminals	16	16	16	16	16	16	16
Maximum operating temperature	85 Cel	85 °C	85 °C	85 Cel	70 °C	70 °C	85 Cel
Minimum operating temperature	-40 Cel	-40 °C	-40 °C	-40 Cel	-	-	-40 Cel
surface mount	Yes	YES	YES	Yes	YES	YES	Yes
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	COMMERCIAL	COMMERCIAL	INDUSTRIAL
control mode	PEAK CURRENT	CURRENT-MODE	CURRENT-MODE	PEAK CURRENT	CURRENT-MODE	CURRENT-MODE	PEAK CURRENT
Maximum output current	2 A	2 A	2 A	2 A	2 A	2 A	2 A
Switch configuration	BUCK	BUCK	BUCK	BUCK	BUCK	BUCK	BUCK
Maximum switching frequency	150 kHz	165 kHz	165 kHz	150 kHz	165 kHz	165 kHz	150 kHz
Brand Name	-	Linear Technology	Linear Technology	-	Linear Technology	Linear Technology	-
Is it Rohs certified?	-	incompatible	incompatible	-	incompatible	incompatible	-
Maker	-	Linear ( ADI )	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	-
Parts packaging code	-	SOIC	SSOP	-	SOIC	SSOP	-
package instruction	-	SOP, SOP16,.25	SSOP, SSOP16,.25	-	SOP, SOP16,.25	SSOP, SSOP16,.25	-
Contacts	-	16	16	-	16	16	-
Manufacturer packaging code	-	S	GN	-	S	GN	-
Reach Compliance Code	-	not_compliant	not_compliant	-	not_compliant	not_compliant	-
ECCN code	-	EAR99	EAR99	-	EAR99	EAR99	-
Analog Integrated Circuits - Other Types	-	SWITCHING CONTROLLER	SWITCHING CONTROLLER	-	SWITCHING CONTROLLER	SWITCHING CONTROLLER	-
Maximum input voltage	-	36 V	36 V	-	36 V	36 V	-
Minimum input voltage	-	3.7 V	3.7 V	-	3.7 V	3.7 V	-
Nominal input voltage	-	15 V	15 V	-	15 V	15 V	-
JESD-30 code	-	R-PDSO-G16	R-PDSO-G16	-	R-PDSO-G16	R-PDSO-G16	-
JESD-609 code	-	e0	e0	-	e0	e0	-
length	-	9.9 mm	4.8895 mm	-	9.9 mm	4.8895 mm	-
Humidity sensitivity level	-	1	1	-	1	1	-
Maximum output voltage	-	36 V	36 V	-	36 V	36 V	-
Minimum output voltage	-	1.19 V	1.19 V	-	1.19 V	1.19 V	-
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	-
encapsulated code	-	SOP	SSOP	-	SOP	SSOP	-
Encapsulate equivalent code	-	SOP16,.25	SSOP16,.25	-	SOP16,.25	SSOP16,.25	-
Package shape	-	RECTANGULAR	RECTANGULAR	-	RECTANGULAR	RECTANGULAR	-
Package form	-	SMALL OUTLINE	SMALL OUTLINE, SHRINK PITCH	-	SMALL OUTLINE	SMALL OUTLINE, SHRINK PITCH	-
Peak Reflow Temperature (Celsius)	-	235	235	-	235	235	-
Certification status	-	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified	-
Maximum seat height	-	1.75 mm	1.727 mm	-	1.75 mm	1.727 mm	-
technology	-	CMOS	CMOS	-	CMOS	CMOS	-
Terminal surface	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	-
Terminal pitch	-	1.27 mm	0.635 mm	-	1.27 mm	0.635 mm	-
Maximum time at peak reflow temperature	-	20	20	-	20	20	-
width	-	3.9 mm	3.899 mm	-	3.9 mm	3.899 mm	-
Base Number Matches	-	1	1	-	1	1	-

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