LTC1538IG-AUX#PBF datasheet, PDF

Datasheet> All Categories > Power/power management> The power supply circuit> LTC1538IG-AUX#PBF

LTC1538IG-AUX#PBF: DescriptionSwitching Voltage Regulators Dual Const Freq Syn Sw Reg Cntrl; CategoryPower/power management The power supply circuit; File Size337KB，32 Pages; ManufacturerADI; Websitehttps://www.analog.com; Environmental Compliance

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LTC1538IG-AUX#PBF Overview

Switching Voltage Regulators Dual Const Freq Syn Sw Reg Cntrl

LTC1538IG-AUX#PBF Parametric

Parameter Name	Attribute value
Brand Name	Analog Devices Inc
Is it lead-free?	Contains lead
Is it Rohs certified?	conform to
Maker	ADI
package instruction	SSOP,
Contacts	28
Manufacturer packaging code	05-08-1640 (G28)
Reach Compliance Code	compliant
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	36 V
Minimum input voltage	3.5 V
Nominal input voltage	15 V
JESD-30 code	R-PDSO-G28
JESD-609 code	e3
length	10.2 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	28
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	2 A
Nominal output voltage	5 V
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	2 mm
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	400 kHz
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	MATTE TIN
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	5.3 mm

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FEATURES

LTC1538-AUX/LTC1539

Dual High Efficiency,

Low Noise, Synchronous

Step-Down Switching Regulators

DESCRIPTION

The LTC

1538-AUX/LTC1539 are dual, synchronous step-

down switching regulator controllers which drive external

N-channel power MOSFETs in a phase-lockable fixed

frequency architecture. The Adaptive Power

output stage

selectively drives two N-channel MOSFETs at frequencies

up to 400kHz while reducing switching losses to maintain

high efficiencies at low output currents.

An auxiliary 0.5A linear regulator using an external PNP

pass device provides a low noise, low dropout voltage

source. A secondary winding feedback control pin (SFB1)

guarantees regulation regardless of load on the main

output by forcing continuous operation.

A 5V/20mA regulator, internal 1.19V reference and an

uncommitted comparator remain active when both con-

trollers are shut down. A power-on reset timer (POR) is

included which generates a signal delayed by 65536/f

CLK

(typ 300ms) after the controller’s output is within 5% of

the regulated first voltage. Internal resistive dividers pro-

vide pin selectable output voltages with remote sense

capability on one of the two outputs.

The operating current levels are user-programmable via

external current sense resistors. Wide input supply range

allows operation from 3.5V to 30V (36V maximum).

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

Adaptive Power is a trademark of Linear Technology Corporation.

Maintains Constant Frequency at Low Output Currents

Dual N-Channel MOSFET Synchronous Drive

Programmable Fixed Frequency (PLL Lockable)

Wide V

Range: 3.5V to 36V Operation

Ultrahigh Efficiency

Very Low Dropout Operation: 99% Duty Cycle

Low Dropout, 0.5A Linear Regulator for VPP

Generation or Low Noise Audio Supply

Built-In Power-On Reset Timer

Programmable Soft Start

Low-Battery Detector

Remote Output Voltage Sense

Foldback Current Limiting (Optional)

Pin Selectable Output Voltage

5V Standby Regulator Active in Shutdown: I

< 200µA

Output Voltages from 1.19V to 9V

Available in 28- and 36-Lead SSOP Packages

APPLICATIONS

Notebook and Palmtop Computers, PDAs

Portable Instruments

Battery-Operated Devices

DC Power Distribution Systems

TYPICAL APPLICATION

, CMDSH-3

BOOST 1

10µH

MBR140T3

M3*

0.1µF

TGL1

TGS1

SW1

BG1

SENSE 1

SENSE1

0.03Ω

OUT1

3.5A

1000pF

C1A

220pF

SENSE

–

TH1

RUN/SS1

10k

SS1

0.1µF

DSC

PROG2

OSC

56pF

SGND

OSENSE2

TH2

PGND RUN/SS2

SS2

0.1µF

5V STANDBY

, CMDSH-3

PROG1

INTV

BOOST 2

TGL2

TGS2

SW2

BG2

LTC1539

SENSE

–

1000pF

SENSE2

0.03Ω

OUT2

3.3V

3.5A

C2A

470pF

, 0.1µF

M6*

10µH

MBR140T3

OUT1

220µF

10V

M1, M2, M4, M5: Si4412DY

1000pF

10k

M3, M6: IRLML2803

*NOT REQUIRED FOR LTC1538-AUX

BOLD LINES INDICATE HIGH CURRENT PATHS

Figure 1. High Efficiency Dual 5V/3V Step-Down Converter

4.7µF

16V

5.2V TO 28V

22µF

35V

1538 F01

OUT

220µF

10V

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Description	Switching Voltage Regulators Dual Const Freq Syn Sw Reg Cntrl	Switching Voltage Regulators LTC1538-AUX - Dual High Efficiency,Low Noise, Synchronous Step-Down Switching Regulators	Switching Voltage Regulators Dual Const Freq Syn Sw Reg Cntrl	Switching Voltage Regulators Dual Const Freq Syn Sw Reg Cntrl	Switching Voltage Regulators LTC1539 - Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators	Switching Voltage Regulators Dual Const Freq Syn Sw Reg Cntrl	Switching Voltage Regulators LTC1538-AUX - Dual High Efficiency,Low Noise, Synchronous Step-Down Switching Regulators	Switching Regulator LTC1539 - Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators	Switching Regulator Dual Const Freq Syn Sw Reg Cntrl	Switching Regulator Dual Const Freq Syn Sw Reg Cntrl
Is it Rohs certified?	conform to	incompatible	conform to	conform to	incompatible	conform to	incompatible	incompatible	conform to	conform to
Maker	ADI	ADI	ADI	ADI	ADI	ADI	ADI	ADI	ADI	ADI
Reach Compliance Code	compliant	not_compliant	compliant	compliant	not_compliant	compliant	not_compliant	not_compliant	compliant	compliant
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
JESD-30 code	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28	R-PDSO-G36	R-PDSO-G36	R-PDSO-G36	R-PDSO-G28	R-PDSO-G36	R-PDSO-G28	R-PDSO-G28
JESD-609 code	e3	e0	e3	e3	e0	e3	e0	e0	e3	e3
Number of terminals	28	28	28	36	36	36	28	36	28	28
Maximum operating temperature	85 °C	85 °C	70 °C	85 °C	85 °C	85 °C	70 °C	70 °C	70 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-	-40 °C	-40 °C	-40 °C	-	-	-	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SSOP	SSOP	SSOP	SSOP	SSOP	SSOP	SSOP	SSOP	SSOP	SSOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	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	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
surface mount	YES	YES	YES	YES	YES	YES	YES	YES	YES	YES
Maximum switching frequency	400 kHz	138 kHz	400 kHz	400 kHz	138 kHz	400 kHz	400 kHz	400 kHz	400 kHz	138 kHz
technology	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	INDUSTRIAL	INDUSTRIAL	COMMERCIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	INDUSTRIAL
Terminal surface	MATTE TIN	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	MATTE TIN	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	MATTE TIN	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	0.65 mm	0.635 mm	0.65 mm	0.8 mm	0.8 mm	0.8 mm	0.65 mm	0.8 mm	0.65 mm	0.635 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Brand Name	Analog Devices Inc	-	Analog Devices Inc	Analog Devices Inc	-	Analog Devices Inc	-	-	Analog Devices Inc	Analog Devices Inc
Is it lead-free?	Contains lead	-	Contains lead	Contains lead	-	Contains lead	-	-	Contains lead	Contains lead
package instruction	SSOP,	-	SSOP,	SSOP,	-	SSOP,	SSOP,	SSOP,	SSOP,	SSOP, SSOP28,.3
Contacts	28	-	28	36	-	36	-	-	28	28
Manufacturer packaging code	05-08-1640 (G28)	-	05-08-1640 (G28)	05-08-1642 (GW36)	-	05-08-1642 (GW36)	-	-	05-08-1640 (G28)	05-08-1640 (G28)
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	-	SWITCHING CONTROLLER	SWITCHING CONTROLLER	-	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	-
Control Technology	PULSE WIDTH MODULATION	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	-
Maximum input voltage	36 V	-	36 V	36 V	-	36 V	36 V	36 V	36 V	-
Minimum input voltage	3.5 V	-	3.5 V	3.5 V	-	3.5 V	3.5 V	3.5 V	3.5 V	-
Nominal input voltage	15 V	-	15 V	15 V	-	15 V	15 V	15 V	15 V	-
length	10.2 mm	-	10.2 mm	15.4 mm	-	15.4 mm	10.2 mm	15.4 mm	10.2 mm	-
Humidity sensitivity level	1	-	1	1	-	1	1	1	1	1
Number of functions	1	-	1	1	-	1	1	1	1	-
Maximum output current	2 A	-	2 A	2 A	-	2 A	2 A	2 A	2 A	-
Nominal output voltage	5 V	-	5 V	5 V	-	5 V	5 V	5 V	5 V	-
Peak Reflow Temperature (Celsius)	260	-	260	260	-	260	235	235	260	-
Maximum seat height	2 mm	-	2 mm	2.65 mm	-	2.65 mm	2 mm	2.65 mm	2 mm	-
Switch configuration	PUSH-PULL	-	PUSH-PULL	PUSH-PULL	-	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	-
Maximum time at peak reflow temperature	30	-	30	30	-	NOT SPECIFIED	20	20	30	-
width	5.3 mm	-	5.3 mm	7.5 mm	-	7.5 mm	5.3 mm	7.5 mm	5.3 mm	-

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