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LT1933ES6#TRMPBF

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LT1933
1
1933fe
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
600mA, 500kHz Step-Down
Switching Regulator in
SOT-23 and DFN Packages
The LT
®
1933 is a current mode PWM step-down DC/DC
converter with an internal 0.75A power switch, packaged
in a tiny 6-lead SOT-23. The wide input range of 3.6V
to 36V makes the LT1933 suitable for regulating power
from a wide variety of sources, including unregulated wall
transformers, 24V industrial supplies and automotive
batteries. Its high operating frequency allows the use of
tiny, low cost inductors and ceramic capacitors, resulting
in low, predictable output ripple.
Cycle-by-cycle current limit provides protection against
shorted outputs, and soft-start eliminates input current
surge during start up. The low current (<2µA) shutdown
provides output disconnect, enabling easy power manage-
ment in battery-powered systems.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
3.3V Step-Down Converter
n
Wide Input Range: 3.6V to 36V
n
5V at 600mA from 16V to 36V Input
n
3.3V at 600mA from 12V to 36V Input
n
5V at 500mA from 6.3V to 36V Input
n
3.3V at 500mA from 4.5V to 36V Input
n
Fixed Frequency 500kHz Operation
n
Uses Tiny Capacitors and Inductors
n
Soft-Start
n
Internally Compensated
n
Low Shutdown Current: <2µA
n
Output Adjustable Down to 1.25V
n
Low Profi le (1mm) SOT-23 (ThinSOT™) and
(2mm × 3mm × 0.75mm) 6-Pin DFN Packages
n
Automotive Battery Regulation
n
Industrial Control Supplies
n
Wall Transformer Regulation
n
Distributed Supply Regulation
n
Battery-Powered Equipment
Effi ciency
V
IN
4.5V TO 36V
OFF ON
0.1µF
22µH
1N4148
MBRM140
10k
16.5k
22µF
1933 TA01a
2.2µF
V
OUT
3.3V/500mA
V
IN
BOOST
GND FB
SHDN SW
LT1933
LOAD CURRENT (mA)
0
90
95
300 400
1933 TA01b
85
80
100 200 600500
75
70
65
EFFICIENCY (%)
V
IN
= 12V
V
OUT
= 5V
V
OUT
= 3.3V
LT1933
2
1933fe
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
) ..................................... – 0.4V to 36V
BOOST Pin Voltage ...................................................43V
BOOST Pin Above SW Pin .........................................20V
SHDN Pin ................................................... –0.4V to 36V
FB Voltage .................................................... –0.4V to 6V
Operating Temperature Range (Note 2)
LT1933E ...................................................–40°C to 85°C
(Note 1)
TOP VIEW
FB
GND
SHDN
BOOST
V
IN
SW
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
4
5
7
6
3
2
1
θ
JA
= 73.5°C/W, θ
JC
= 12°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
BOOST 1
GND 2
FB 3
6 SW
5 V
IN
4 SHDN
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
θ
JA
= 165°C/W, θ
JC
= 102°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1933IDCB#PBF LT1933IDCB#TRPBF LCGM
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LT1933HDCB#PBF LT1933HDCB#TRPBF LCGN
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 150°C
LT1933ES6#PBF LT1933ES6#TRPBF LTAGN 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1933IS6#PBF LT1933IS6#TRPBF LTAGP 6-Lead Plastic TSOT-23 –40°C to 125°C
LT1933HS6#PBF LT1933HS6#TRPBF LTDDQ 6-Lead Plastic TSOT-23 –40°C to 150°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1933IDCB LT1933IDCB#TR LCGM
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LT1933HDCB LT1933HDCB#TR LCGN
6-Lead (2mm × 3mm) Plastic DFN
–40°C to 150°C
LT1933ES6 LT1933ES6#TR LTAGN 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1933IS6 LT1933IS6#TR LTAGP 6-Lead Plastic TSOT-23 –40°C to 125°C
LT1933HS6 LT1933HS6#TR LTDDQ 6-Lead Plastic TSOT-23 –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/
LT1933I .................................................. –40°C to 125°C
LT1933H ................................................–40°C to 150°C
Maximum Junction Temperature
LT1933E, LT1933I ................................................. 125°C
LT1933H ............................................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature, S6 Package
(Soldering, 10 sec) ............................................300°C
LT1933
3
1933fe
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 LT1933E 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
with statistical process controls. The LT1933I specifi cations are
PARAMETER CONDITIONS MIN TYP MAX UNITS
Undervoltage Lockout 3.35 3.6 V
Feedback Voltage
l
1.225 1.245 1.265 V
FB Pin Bias Current V
FB
= Measured V
REF
+ 10mV (Note 4)
l
40 120 nA
Quiescent Current Not Switching 1.6 2.5 mA
Quiescent Current in Shutdown V
SHDN
= 0V 0.01 2 µA
Reference Line Regulation V
IN
= 5V to 36V 0.01 %/V
Switching Frequency V
FB
= 1.1V 400 500 600 kHz
V
FB
= 0V 55 kHz
Maximum Duty Cycle
l
88 94 %
Switch Current Limit (Note 3) 0.75 1.05 A
Switch V
CESAT
I
SW
= 400mA, S6 Package
I
SW
= 400mA, DCB6 Package
370
370
500 mV
mV
Switch Leakage Current 2µA
Minimum Boost Voltage Above Switch I
SW
= 400mA 1.9 2.3 V
BOOST Pin Current I
SW
= 400mA 18 25 mA
SHDN Input Voltage High 2.3 V
SHDN Input Voltage Low 0.3 V
SHDN Bias Current V
SHDN
= 2.3V (Note 5)
V
SHDN
= 0V
34
0.01
50
0.1
µA
µA
The l 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)
guaranteed over the –40°C to 125°C temperature range. The LT1933H
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.
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LT1933ES6#TRMPBF

Mfr. #:
Buy LT1933ES6#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 600mA, 500kHz Ste-dwn in ThinSOT
Lifecycle:
New from this manufacturer.
Delivery:
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