LT3493 Datasheet, PDF (1/20 Pages) Linear Technology – 1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN

FEATURES
n _{Wide Input Range: 3.6V to 36V Operating,}
40V Maximum
n _{1.2A Output Current}
n _{Fixed Frequency Operation: 750kHz}
n _{Output Adjustable Down to 780mV}
n _{Short-Circuit Robust}
n _{Uses Tiny Capacitors and Inductors}
n _Soft-Start
n _{Internally Compensated}
n _{Low Shutdown Current: <2μA}
n _{Low VCESAT Switch: 330mV at 1A}
n _{Thermally Enhanced, Low Profile DFN Package}
APPLICATIONS
n _{Automotive Battery Regulation}
n _{Industrial Control Supplies}
n _{Wall Transformer Regulation}
n _{Distributed Supply Regulation}
n _{Battery-Powered Equipment}
LT3493
1.2A, 750kHz Step-Down
Switching Regulator in
2mm × 3mm DFN
DESCRIPTION
The LT^®3493 is a current mode PWM step-down DC/DC
converter with an internal 1.75A power switch. The wide
operating input range of 3.6V to 36V (40V maximum)
makes the LT3493 ideal for regulating power from a wide
variety of sources, including unregulated wall transform-
ers, 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
mode provides output disconnect, enabling easy power
management in battery-powered systems.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
V_IN
4.2V TO 36V
ON OFF
3.3V Step-Down Converter
V_IN
BOOST
LT3493
SHDN
SW
GND FB
1μF
0.1μF _10μH
32.4k
10k
V_OUT
3.3V
1.2A, V_IN > 12V
0.95A, V_IN > 5V
22pF
10μF
3493 TA01a
Efficiency
90
85
80
75
70
65
60
V_IN = 12V
55 V_OUT = 3.3V
L = 10μH
50
0 0.2 0.4 0.6 0.8
LOAD CURRENT (A)
1.0 1.2
3493 TA01b
3493fb
1