LT1977EFE#TRPBF datasheet, PDF

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LT1977EFE#TRPBF: DescriptionSwitching Regulator 1.5A, 500kHz HV Step-down w/ Burst Mode Operation; CategoryPower/power management The power supply circuit; File Size296KB，24 Pages; ManufacturerADI; Websitehttps://www.analog.com; Environmental Compliance

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LT1977EFE#TRPBF Overview

Switching Regulator 1.5A, 500kHz HV Step-down w/ Burst Mode Operation

LT1977EFE#TRPBF Parametric

Parameter Name	Attribute value
Brand Name	Analog Devices Inc
Is it lead-free?	Contains lead
Is it Rohs certified?	conform to
package instruction	HTSSOP,
Contacts	16
Manufacturer packaging code	05-08-1663 (BC)
Reach Compliance Code	compliant
Is Samacsys	N
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	60 V
Minimum input voltage	3.3 V
Nominal input voltage	12 V
JESD-30 code	R-PDSO-G16
JESD-609 code	e3
length	5 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	16
Maximum operating temperature	125 °C
Minimum operating temperature
Maximum output current	3.5 A
Package body material	PLASTIC/EPOXY
encapsulated code	HTSSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.1 mm
surface mount	YES
Switch configuration	BUCK
Maximum switching frequency	575 kHz
Temperature level	OTHER
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	4.4 mm
Base Number Matches	1

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LT1977

High Voltage 1.5A, 500kHz

Step-Down Switching Regulator

with 100µA Quiescent Current

FEATURES

■

DESCRIPTIO

Wide Input Range: 3.3V to 60V

1.5A Peak Switch Current

Burst Mode

Operation: 100µA Quiescent Current**

Low Shutdown Current: I

< 1µA

Power Good Flag with Programmable Threshold

Load Dump Protection to 60V

500kHz Switching Frequency

Saturating Switch Design: 0.2Ω On-Resistance

Peak Switch Current Maintained Over

Full Duty Cycle Range*

1.25V Feedback Reference Voltage

Easily Synchronizable

Soft-Start Capability

Small 16-Pin Thermally Enhanced TSSOP Package

The LT

1977 is a 500kHz monolithic buck switching

regulator that accepts input voltages up to 60V. A high

efficiency 1.5A, 0.2Ω switch is included on the die along

with all the necessary oscillator, control and logic cir-

cuitry. Current mode topology is used for fast transient

response and good loop stability.

Innovative design techniques along with a new high volt-

age process achieve high efficiency over a wide input

range. Efficiency is maintained over a wide output current

range by employing Burst Mode operation at low currents,

utilizing the output to bias the internal circuitry, and by

using a supply boost capacitor to fully saturate the power

switch. Patented circuitry maintains peak switch current

over the full duty cycle range.* Shutdown reduces input

supply current to less than 1µA. External synchronization

can be implemented by driving the SYNC pin with logic-level

inputs. A single capacitor from the C

pin to the output

provides a controlled output voltage ramp (soft-start). The

device also has a power good flag with a programmable

threshold and time-out and thermal shutdown protection.

The LT1977 is available in a 16-pin TSSOP package with

exposed pad leadframe for low thermal resistance. The

LT1976, a 200kHz reduced switch frequency version of the

LT1977, is also available. See the Applications Information

section for selection criteria between the LT1976 and

LT1977.

Efficiency and Power Loss

vs Load Current

100

= 12V

OUT

= 5V

APPLICATIO S

■

High Voltage Power Conversion

14V and 42V Automotive Systems

Industrial Power Systems

Distributed Power Systems

Battery-Powered Systems

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

Burst Mode is a registered trademark of Linear Technology Corporation.

*Protected by U.S. Patents including 6498466, 6531909.

**See Burst Mode Operation section for conditions

TYPICAL APPLICATIO

Supply Current vs Input Voltage

150

125

OUT

= 3.3V

= 25°C

14V to 3.3V Step-Down Converter with

100µA No Load Quiescent Current

SHDN

LT1977

1500pF

26k

1µF

SYNC

GND

330pF

BIAS

PGFB

100k

10pF

165k

100µF

6.3V

TANT

BOOST

0.1µF

10µH

1N4148

OUT

3.3V

SUPPLY CURRENT (µA)

2.2µF

100V

CER

EFFICIENCY (%)

100

INPUT VOLTAGE (V)

1977 F05

10MQ100N

1977 TA01

OUT

= 3.3V

POWER LOSS (W)

TYPICAL

POWER LOSS

0.1

0.01

0.0001

0.001

0.1

0.01

LOAD CURRENT (A)

1977 TA02

1977fa

LT1977EFE#TRPBF Related Products

	LT1977EFE#TRPBF	LT1977EFE#TR	LT1977IFE#PBF	LT1977EFE#PBF	HCHP0603100PPM2180.5%N0131E2	LT1977IFE#TRPBF	LT1977IFE#TR
Description	Switching Regulator 1.5A, 500kHz HV Step-down w/ Burst Mode Operation	Switching Voltage Regulators LT1977 - High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100- A Quiescent Current	Switching Voltage Regulators 1.5A, 500kHz HV Step-down w/ BurstMode Operation	Switching Voltage Regulators 1.5A, 500kHz HV Step-down w/ Burst Mode Operation	Fixed Resistor, Metal Glaze/thick Film, 0.125W, 218ohm, 50V, 0.5% +/-Tol, -100,100ppm/Cel, 0603,	Switching Voltage Regulators 1.5A, 500kHz HV Step-down w/ Burst Mode Operation	Switching Regulator LT1977 - High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100- A Quiescent Current
Is it Rohs certified?	conform to	incompatible	conform to	conform to	conform to	conform to	incompatible
Reach Compliance Code	compliant	not_compliant	compliant	compliant	compliant	compliant	not_compliant
JESD-609 code	e3	e0	e3	e3	e2	e3	e0
Number of terminals	16	16	16	16	2	16	16
Maximum operating temperature	125 °C	125 °C	125 °C	125 °C	155 °C	125 °C	125 °C
Minimum operating temperature	-	-	-40 °C	-	-55 °C	-40 °C	-40 °C
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	SMT	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Terminal surface	Matte Tin (Sn)	Tin/Lead (Sn/Pb)	MATTE TIN	MATTE TIN	Tin/Silver (Sn/Ag) - with Nickel (Ni) barrier	MATTE TIN	Tin/Lead (Sn/Pb)
Brand Name	Analog Devices Inc	-	Analog Devices Inc	Analog Devices Inc	-	Analog Devices Inc	-
Is it lead-free?	Contains lead	-	Contains lead	Contains lead	-	Contains lead	-
package instruction	HTSSOP,	HTSSOP,	HTSSOP,	HTSSOP,	-	HTSSOP,	HTSSOP,
Contacts	16	-	16	16	-	16	-
Manufacturer packaging code	05-08-1663 (BC)	-	05-08-1663 (BC)	05-08-1663 (BC)	-	05-08-1663 (BC)	-
Is Samacsys	N	N	N	N	-	N	N
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	-	SWITCHING REGULATOR	SWITCHING REGULATOR
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	-	CURRENT-MODE	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	60 V	60 V	60 V	60 V	-	60 V	60 V
Minimum input voltage	3.3 V	3.3 V	3.3 V	3.3 V	-	3.3 V	3.3 V
Nominal input voltage	12 V	12 V	12 V	12 V	-	12 V	12 V
JESD-30 code	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	-	R-PDSO-G16	R-PDSO-G16
length	5 mm	5 mm	5 mm	5 mm	-	5 mm	5 mm
Humidity sensitivity level	1	1	1	1	-	1	1
Number of functions	1	1	1	1	-	1	1
Maximum output current	3.5 A	3.5 A	3.5 A	3.5 A	-	3.5 A	3.5 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HTSSOP	HTSSOP	HTSSOP	HTSSOP	-	HTSSOP	HTSSOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	-	RECTANGULAR	RECTANGULAR
Peak Reflow Temperature (Celsius)	260	235	260	260	-	260	235
Certification status	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
surface mount	YES	YES	YES	YES	-	YES	YES
Switch configuration	BUCK	BUCK	BUCK	BUCK	-	BUCK	BUCK
Maximum switching frequency	575 kHz	575 kHz	575 kHz	575 kHz	-	575 kHz	575 kHz
Temperature level	OTHER	OTHER	AUTOMOTIVE	OTHER	-	AUTOMOTIVE	AUTOMOTIVE
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
Maximum time at peak reflow temperature	30	20	30	30	-	30	20
width	4.4 mm	4.4 mm	4.4 mm	4.4 mm	-	4.4 mm	4.4 mm
Base Number Matches	1	1	1	1	-	1	1

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