LTC1142CG#TR datasheet, PDF - EEWORLD Datasheet

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LTC1142CG#TR: DescriptionSwitching Regulator LTC1142 - Dual High Efficiency Synchronous Step-Down Switching Regulators; CategoryPower/power management The power supply circuit; File Size245KB，20 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LTC1142CG#TR Overview

Switching Regulator LTC1142 - Dual High Efficiency Synchronous Step-Down Switching Regulators

LTC1142CG#TR Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	ADI
package instruction	SSOP-28
Reach Compliance Code	not_compliant
Other features	5 VOLT OUTPUT ALSO AVAILABLE
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	CURRENT-MODE
Control Technology	CONSTANT OFF TIME
Maximum input voltage	20 V
Minimum input voltage	3.5 V
Nominal input voltage	10 V
JESD-30 code	R-PDSO-G28
JESD-609 code	e0
length	10.2 mm
Number of functions	1
Number of terminals	28
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output voltage	3.43 V
Minimum output voltage	3.23 V
Nominal output voltage	3.3 V
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Encapsulate equivalent code	SSOP28,.3
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Maximum seat height	1.99 mm
Maximum supply current (Isup)	2.1 mA
surface mount	YES
Switch configuration	BUCK
Maximum switching frequency	250 kHz
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
width	5.29 mm

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LTC1142/LTC1142L/LTC1142HV

Dual High Efficiency

Synchronous Step-Down

Switching Regulators

FEATURES

DESCRIPTIO

Dual Outputs: 3.3V and 5V or User Programmable

Ultrahigh Efficiency: Over 95% Possible

Current Mode Operation for Excellent Line and Load

Transient Response

High Efficiency Maintained over 3 Decades of

Output Current

Low Standby Current at Light Loads: 160µA/Output

Independent Micropower Shutdown: I

< 40µA

Wide V

Range: 3.5V to 20V

Very Low Dropout Operation: 100% Duty Cycle

Synchronous FET Switching for High Efficiency

Available in Standard 28-Pin SSOP

The LTC

1142/LTC1142L/LTC1142HV are dual synchro-

nous step-down switching regulator controllers featuring

automatic Burst Mode

operation to maintain high efficien-

cies at low output currents. The devices are composed of two

separate regulator blocks, each driving a pair of external

complementary power MOSFETs, at switching frequencies

up to 250kHz, using a constant off-time current mode archi-

tecture providing constant ripple current in the inductor.

The operating current level for both regulators is user pro-

grammable via an external current sense resistor. Wide input

supply range allows operation from 3.5V* to 18V (20V

maximum). Constant off-time architecture provides low drop-

out regulation limited only by the R

DS(ON)

of the external

MOSFET and resistance of the inductor and current sense

resistor.

The LTC1142 series is ideal for applications requiring dual

output voltages with high conversion efficiencies over a wide

load current range in a small amount of board space.

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

Burst Mode is a trademark of Linear Technology Corporation.

APPLICATIO S

Notebook and Palmtop Computers

Battery-Operated Digital Devices

Portable Instruments

DC Power Distribution Systems

TYPICAL APPLICATIO

IN3

22µF

25V

5.2V TO 18V

0.22µF

P-CH

Si9430DY

IN3

PDRIVE 3

SHDN3

0V = NORMAL

>1.5V = SHDN

SHDN5

IN5

PDRIVE 5

0.22µF

P-CH

Si9430DY

50µH

OUT3

3.3V/2A

SENSE3

0.05Ω

50µH

1000pF

MBRS130L

N-CH

Si9410DY

SENSE

–

NDRIVE 3

PGND3 SGND3 C

LTC1142HV

SENSE

–

NDRIVE 5

1000pF

N-CH

Si9410DY

MBRS130L

OUT3

220µF

10V

TH3

TH5

SGND5 PGND5

SENSE3,

SENSE5

: DALE WSL-2010-.05

L1, L2: COILTRONICS CTX50-2-MP

PINS 5, 7, 8, 19, 21, 22: NC

560pF 3300pF 3300pF 390pF

1142 F01

NOTE: COMPONENTS OPTIMIZED FOR HIGHEST EFFICIENCY, NOT MINIMUM BOARD SPACE.

Figure 1. High Efficiency Dual 3.3V, 5V Supply

IN5

22µF

25V

SENSE5

0.05Ω

OUT5

5V/2A

OUT5

220µF

10V

LTC1142CG#TR Related Products

	LTC1142CG#TR	LTC1142LCG-ADJ#TR	LTC1142CG	LTC1142HVCG	LTC1142HVCG-ADJ#TR	LTC1142HVCG#TR
Description	Switching Regulator LTC1142 - Dual High Efficiency Synchronous Step-Down Switching Regulators	Switching Voltage Regulators LTC1142 - Dual High Efficiency Synchronous Step-Down Switching Regulators	Switching Voltage Regulators LTC1142 - Dual High Efficiency Synchronous Step-Down Switching Regulators	Switching Voltage Regulators LTC1142 - Dual High Efficiency Synchronous Step-Down Switching Regulators	Switching Voltage Regulators LTC1142 - Dual High Efficiency Synchronous Step-Down Switching Regulators	Switching Regulator LTC1142 - Dual High Efficiency Synchronous Step-Down Switching Regulators
Is it Rohs certified?	incompatible	incompatible	incompatible	incompatible	incompatible	incompatible
package instruction	SSOP-28	SSOP, SSOP28,.3	0.209 INCH, PLASTIC, SSOP-28	SSOP-28	SSOP-28	SSOP, SSOP28,.3
Reach Compliance Code	not_compliant	not_compliant	compliant	compliant	not_compliant	not_compliant
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING CONTROLLER	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME
Maximum input voltage	20 V	20 V	18 V	20 V	20 V	20 V
Minimum input voltage	3.5 V	3.5 V	3.5 V	3.5 V	3.5 V	3.5 V
Nominal input voltage	10 V	10 V	10 V	10 V	10 V	10 V
JESD-30 code	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28
JESD-609 code	e0	e0	e0	e0	e0	e0
length	10.2 mm	10.2 mm	10.2 mm	10.2 mm	10.2 mm	10.2 mm
Number of functions	1	1	1	1	1	1
Number of terminals	28	28	28	28	28	28
Maximum operating temperature	70 °C	70 °C	70 °C	70 °C	70 °C	70 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SSOP	SSOP	SSOP	SSOP	SSOP	SSOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Maximum seat height	1.99 mm	1.99 mm	2 mm	1.99 mm	1.99 mm	1.99 mm
surface mount	YES	YES	YES	YES	YES	YES
Switch configuration	BUCK	BUCK	PUSH-PULL	BUCK	BUCK	BUCK
Maximum switching frequency	250 kHz	250 kHz	250 kHz	250 kHz	250 kHz	250 kHz
technology	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	0.65 mm	0.65 mm	0.65 mm	0.65 mm	0.65 mm	0.65 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
width	5.29 mm	5.29 mm	5.3 mm	5.29 mm	5.29 mm	5.29 mm
Maker	ADI	-	ADI	ADI	ADI	ADI
Other features	5 VOLT OUTPUT ALSO AVAILABLE	5 VOLT OUTPUT ALSO AVAILABLE	-	5 VOLT OUTPUT ALSO AVAILABLE	5 VOLT OUTPUT ALSO AVAILABLE	5 VOLT OUTPUT ALSO AVAILABLE
Maximum output voltage	3.43 V	3.43 V	-	3.43 V	3.43 V	3.43 V
Minimum output voltage	3.23 V	3.23 V	-	3.23 V	3.23 V	3.23 V
Nominal output voltage	3.3 V	3.3 V	-	3.3 V	3.3 V	3.3 V
Encapsulate equivalent code	SSOP28,.3	SSOP28,.3	-	SSOP28,.3	SSOP28,.3	SSOP28,.3
Maximum supply current (Isup)	2.1 mA	2.1 mA	-	2.3 mA	2.3 mA	2.3 mA

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