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LT1977IFE#TR

Description
Switching Regulator LT1977 - High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100- A Quiescent Current
CategoryPower/power management    The power supply circuit   
File Size296KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LT1977IFE#TR Overview

Switching Regulator LT1977 - High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100- A Quiescent Current

LT1977IFE#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
package instructionHTSSOP,
Reach Compliance Codenot_compliant
ECCN codeEAR99
Is SamacsysN
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage60 V
Minimum input voltage3.3 V
Nominal input voltage12 V
JESD-30 codeR-PDSO-G16
JESD-609 codee0
length5 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Maximum output current3.5 A
Package body materialPLASTIC/EPOXY
encapsulated codeHTSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.1 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency575 kHz
Temperature levelAUTOMOTIVE
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width4.4 mm
Base Number Matches1
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
Q
< 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
SS
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
V
IN
= 12V
V
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
V
OUT
= 3.3V
T
A
= 25°C
14V to 3.3V Step-Down Converter with
100µA No Load Quiescent Current
V
IN
V
IN
SHDN
LT1977
V
C
1500pF
26k
1µF
C
T
SYNC
GND
330pF
C
SS
V
BIAS
FB
PGFB
PG
100k
1%
10pF
165k
1%
+
100µF
6.3V
TANT
BOOST
0.1µF
SW
0.1µF
10µH
1N4148
V
OUT
3.3V
1A
SUPPLY CURRENT (µA)
2.2µF
100V
CER
EFFICIENCY (%)
100
75
50
25
0
0
10
30
40
20
INPUT VOLTAGE (V)
50
60
1977 F05
10MQ100N
1977 TA01
U
10
U
U
75
V
OUT
= 3.3V
1
POWER LOSS (W)
50
TYPICAL
POWER LOSS
0.1
25
0.01
0
0.0001
0.001
0.001
0.1
0.01
LOAD CURRENT (A)
1
10
1977 TA02
1977fa
1

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Description Switching Regulator LT1977 - High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100- A Quiescent Current 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 1.5A, 500kHz HV Step-down w/ Burst Mode Operation
Is it Rohs certified? incompatible incompatible conform to conform to conform to conform to conform to
Reach Compliance Code not_compliant not_compliant compliant compliant compliant compliant compliant
JESD-609 code e0 e0 e3 e3 e2 e3 e3
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 - -40 °C - -55 °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 Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) MATTE TIN MATTE TIN Tin/Silver (Sn/Ag) - with Nickel (Ni) barrier MATTE TIN Matte Tin (Sn)
package instruction HTSSOP, HTSSOP, HTSSOP, HTSSOP, - HTSSOP, HTSSOP,
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) 235 235 260 260 - 260 260
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 AUTOMOTIVE OTHER AUTOMOTIVE OTHER - AUTOMOTIVE OTHER
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 20 20 30 30 - 30 30
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
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
Contacts - - 16 16 - 16 16
Manufacturer packaging code - - 05-08-1663 (BC) 05-08-1663 (BC) - 05-08-1663 (BC) 05-08-1663 (BC)
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