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LT3503EDCB#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LT3503
3503f
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
1A, 2.2MHz Step-Down
Switching Regulator in
2mm × 3mm DFN
The LT
®
3503 is a current mode PWM step-down DC/DC
converter with an internal 1.45A power switch. The wide
operating input range of 3.6V to 20V makes the LT3503
ideal for regulating power from a wide variety of sources.
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
mode provides output disconnect, enabling easy power
management in battery-powered systems.
■
Wide Input Range: 3.6V to 20V
■
5V at 1.2A from 11V to 18V Input
■
5V at 1A from 7.2V to 18V Input
■
3.3V at 1.2A from 8.5V to 12V Input
■
3.3V at 1A from 5.5V to 12V Input
■
Fixed Frequency Operation: 2.2MHz
■
Output Adjustable Down to 780mV
■
Short-Circuit Robust
■
Uses Tiny Capacitors and Inductors
■
Soft-Start
■
Internally Compensated
■
Low Shutdown Current: <2µA
■
Low V
CESAT
Switch: 400mV at 1A
■
Thermally Enhanced, 2mm × 3mm 6-Pin DFN
Low Profile Package
■
Automotive Battery Regulation
■
Industrial Control Supplies
■
Wall Transformer Regulation
■
Distributed Supply Regulation
■
Battery-Powered Equipment
3.3V Step-Down Converter
Efficiency
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
V
IN
4.5V TO 12V
20V MAX
ON OFF
0.1µF
2.5µH
37.4k
10µF
3503 TA01a
120pF
1µF
11.5k
V
OUT
3.3V
1A, V
IN
> 5.5V
1.2A, V
IN
> 8.5V
V
IN
BOOST
GND FB
SHDN
SW
LT3503
LOAD CURRENT (A)
0
85
80
75
70
65
60
55
50
0.6 1.0
3503 TA01b
0.2 0.4
0.8 1.2
EFFICIENCY (%)
V
IN
= 12V
2
LT3503
3503f
Input Voltage (V
IN
) .................................................. 20V
BOOST Pin Voltage .................................................. 40V
BOOST Pin Above SW Pin ....................................... 20V
SHDN Pin ................................................................ 20V
FB Voltage ................................................................. 6V
Operating Temperature Range (Note 2) ... –40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
ORDER PART NUMBER
DCB PART MARKING
LT3503EDCB
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
T
JMAX
= 125°C, θ
JA
= 64°C/ W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF
Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Range 3.6 20 V
Undervoltage Lockout 3.0 3.4 3.6 V
Feedback Voltage ● 765 780 795 mV
FB Pin Bias Current V
FB
= Measured V
REF
(Note 4) ● 50 150 nA
Quiescent Current Not Switching 1.9 2.6 mA
Quiescent Current in Shutdown V
SHDN
= 0V 0.01 2 µA
Reference Line Regulation V
IN
= 5V to 20V 0.007 %/V
Switching Frequency V
FB
= 0.7V 2.0 2.2 2.4 MHz
V
FB
= 0V 36 kHz
Maximum Duty Cycle ● 76 81 %
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 12V, V
BOOST
= 17V, unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LCGW
TOP VIEW
SHDN
V
IN
SW
FB
GND
BOOST
DCB PACKAGE
6-LEAD (2mm 3mm) PLASTIC DFN
4
5
7
6
3
2
1
3
LT3503
3503f
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch Current Limit (Note 3) 1.45 1.75 2.2 A
Switch V
CESAT
I
SW
= 1A 400 mV
Switch Leakage Current 2 µA
Minimum Boost Voltage Above Switch I
SW
= 1A 2 2.3 V
BOOST Pin Current I
SW
= 1A 25 50 mA
SHDN Input Voltage High 2.3 V
SHDN Input Voltage Low 0.3 V
SHDN Bias Current V
SHDN
= 2.3V (Note 5) 6 15 µA
V
SHDN
= 0V 0.01 0.1 µA
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 12V, V
BOOST
= 17V, unless otherwise noted. (Note 2)
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 LT3503E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
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 flows out of pin.
Note 5: Current flows into pin.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Efficiency (V
OUT
= 3.3V)
Efficiency (V
OUT
= 5V)
T
A
= 25°C unless otherwise noted.
LOAD CURRENT (A)
0
EFFICIENCY (%)
82
86
90
0.8
3503 G01
78
74
80
84
88
76
72
70
0.2
0.4
0.6
1.0
1.2
V
IN
= 8V
L = 2.5µH
V
IN
= 12V
LOAD CURRENT (A)
0
EFFICIENCY (%)
82
86
90
0.8
3503 G02
78
74
80
84
88
76
72
70
0.2
0.4
0.6
1.0
1.2
V
IN
= 12V
L = 3.3µH
V
IN
= 16V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT3503EDCB#TRMPBF

Mfr. #:
Buy LT3503EDCB#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1A, 2.2MHz Buck Sw Reg in 2 x 3 DFN
Lifecycle:
New from this manufacturer.
Delivery:
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