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LT1936EMS8E#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT1936
1
1936fd
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.4A, 500kHz Step-Down
Switching Regulator
The LT
®
1936 is a current mode PWM step-down DC/DC
converter with an internal 1.9A power switch, packaged
in a tiny, thermally enhanced 8-lead MSOP. The wide in-
put range of 3.6V to 36V makes the LT1936 suitable for
regulating power from a wide variety of sources, including
automotive batteries, 24V industrial supplies and unregu-
lated wall adapters. Its high operating frequency allows the
use of small, low cost inductors and ceramic capacitors,
resulting in low, predictable output ripple.
Cycle-by-cycle current limit, frequency foldback and
thermal shutdown provide protection against shorted
outputs, and soft-start eliminates input current surge
during start-up. Transient response can be optimized by
using external compensation components, or board space
can be minimized by using internal compensation. The
low current (<2μA) shutdown mode enables easy power
management in battery-powered systems.
■
Wide Input Range: 3.6V to 36V
■
Short-Circuit Protected Over Full Input Range
■
1.9A Guaranteed Minimum Switch Current
■
5V at 1.4A from 10V to 36V Input
■
3.3V at 1.4A from 7V to 36V Input
■
5V at 1.2A from 6.3V to 36V Input
■
3.3V at 1.2A from 4.5V to 36V Input
■
Output Adjustable Down to 1.20V
■
500kHz Fixed Frequency Operation
■
Soft-Start
■
Uses Small Ceramic Capacitors
■
Internal or External Compensation
■
Low Shutdown Current: <2μA
■
Thermally Enhanced 8-Lead MSOP Package
■
Automotive Battery Regulation
■
Industrial Control Supplies
■
Unregulated Wall Adapters
3.3V Step-Down Converter Effi ciency
V
IN
4.5V TO 36V
ON OFF
0.22μF
10μH
17.4k
22μF
1936 TA01a
4.7μF
V
OUT
3.3V
1.2A
V
IN
BOOST
V
C
GND
COMP FB
LT1936
SHDN SW
10k
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
75
80
85
95
0.5 1
1936 TA01b
1.5
90
V
OUT
= 5V
V
IN
= 12V
V
OUT
= 3.3V
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LT1936
2
1936fd
PIN CONFIGURATION
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
V
IN
Voltage ................................................. –0.4V to 36V
BOOST Voltage .........................................................43V
BOOST Above SW Voltage ........................................20V
SHDN Voltage ............................................ –0.4V to 36V
FB, V
C
, COMP Voltage .................................................6V
Operating Temperature Range (Note 2)
LT1936E ............................................... –40°C to 85°C
LT1936I .............................................. –40°C to 125°C
LT1936H ............................................ –40°C to 150°C
Maximum Junction Temperature
LT1936E, LT1936I ............................................. 125°C
LT1936H ........................................................... 150°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
1
2
3
4
BOOST
V
IN
SW
GND
8
7
6
5
COMP
V
C
FB
SHDN
TOP VIEW
9
MS8E PACKAGE
8-LEAD PLASTIC MSOP
θ
JA
= 40°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, V
BOOST
= 17V, unless otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Undervoltage Lockout 3.45 3.6 V
Quiescent Current V
FB
= 1.5V 1.8 2.5 mA
Quiescent Current in Shutdown V
SHDN
= 0V 0.1 2 μA
FB Voltage
●
1.175 1.200 1.215 V
FB Pin Bias Current (Note 4) V
FB
= 1.20V, E and I Grades
H Grade
●
●
50
50
200
300
nA
nA
FB Voltage Line Regulation V
IN
= 5V to 36V 0.01 %/V
Error Amp gm V
C
= 0.5V, I
VC
= ±5μA 250 μS
Error Amp Voltage Gain V
C
= 0.8V, 1.2V 150
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1936EMS8E#PBF LT1936EMS8E#TRPBF LTBMT 8-Lead Plastic MSOP –40°C to 85°C
LT1936IMS8E#PBF LT1936IMS8E#TRPBF LTBRV 8-Lead Plastic MSOP –40°C to 125°C
LT1936HMS8E#PBF LT1936HMS8E#TRPBF LTBWB 8-Lead Plastic MSOP –40°C to 150°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1936EMS8E LT1936EMS8E#TR LTBMT 8-Lead Plastic MSOP –40°C to 85°C
LT1936IMS8E LT1936IMS8E#TR LTBRV 8-Lead Plastic MSOP –40°C to 125°C
LT1936HMS8E LT1936HMS8E#TR LTBWB 8-Lead Plastic MSOP –40°C to 150°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
LT1936
3
1936fd
LOAD CURRENT (A)
0
60
EFFICIENCY (%)
70
80
90
100
0.5 1.0
1936 G02
1.5
V
OUT
= 3.3V
T
A
= 25°C
D1 = DFLS140L
L1 = 10μH, TOKO D63CB
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
LOAD CURRENT (A)
0
60
EFFICIENCY (%)
70
80
90
100
0.5 1.0
1936 G01
1.5
V
OUT
= 5V
T
A
= 25°C
D1 = DFLS140L
L1 = 15μH, TOKO D63CB
V
IN
= 12V
V
IN
= 24V
DUTY CYCLE (%)
0
0
CURRENT LIMIT (A)
0.5
1.0
1.5
2.0
2.5
3.0
20 40
TYP
MIN
60 80
1936 G03
100
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT1936E is guaranteed to meet performance specifi cations
from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, V
BOOST
= 17V, unless otherwise noted. (Note 2)
V
C
Clamp 1.8 V
V
C
Switch Threshold 0.7 V
Internal Compensation R 50 kΩ
Internal Compensation C V
COMP
= 1V 150 pF
COMP Pin Leakage V
COMP
= 1.8V, E and I Grades
H Grade
●
●
1
2
μA
μA
Switching Frequency V
FB
= 1.1V
V
FB
= 0V
400 500
40
600 kHz
kHz
Maximum Duty Cycle
●
87 92 %
Switch Current Limit (Note 3) 1.9 2.2 2.6 A
Switch V
CESAT
I
SW
= 1.2A 410 520 mV
Switch Leakage Current 2μA
Minimum BOOST Voltage Above SW I
SW
= 1.2A 2 2.2 V
BOOST Pin Current I
SW
= 1.2A 28 50 mA
BOOST Pin Leakage V
SW
= 0V 0.1 1 μA
SHDN Input Voltage High 2.3 V
SHDN Input Voltage Low 0.3 V
SHDN Pin Current V
SHDN
= 2.3V (Note 5)
V
SHDN
= 12V (Note 5)
V
SHDN
= 0V
34
140
0.01
50
240
0.1
μA
μA
μA
with statistical process controls. The LT1936I specifi cations are
guaranteed over the –40°C to 125°C temperature range. The LT1936H
specifi cations are guaranteed over the –40°C to 150°C temperature range.
Note 3: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
Note 4: Current fl ows out of pin.
Note 5: Current fl ows into pin.
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency, V
OUT
= 5V Effi ciency, V
OUT
= 3.3V Switch Current Limit
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT1936EMS8E#PBF

Mfr. #:
Buy LT1936EMS8E#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 36V, 1.4A, 500kHz. Step-Down in MS8E
Lifecycle:
New from this manufacturer.
Delivery:
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