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

FEATURES
■ _{Wide Input Range: 6.8V to 36V Operating,}
40V Maximum
■ _{1.2A Output Current}
■ _{Fixed Frequency Operation: 750kHz}
■ _{Output Adjustable Down to 780mV}
■ _{Short-Circuit Robust}
■ _{Uses Tiny Capacitors and Inductors}
■ _Soft-Start
■ _{Internally Compensated}
■ _{Low Shutdown Current: <2µA}
■ _{Low VCESAT Switch: 330mV at 1A}
■ _{Thermally Enhanced, Low Profile 2mm × 3mm}
DFN-6 Package
U
APPLICATIO S
■ _{Automotive Battery Regulation}
■ _{Industrial Control Supplies}
■ _{Wall Transformer Regulation}
■ _{Distributed Supply Regulation}
■ _{Battery-Powered Equipment}
LT3493-3
1.2A, 750kHz Step-Down
Switching Regulator in
2mm × 3mm DFN
DESCRIPTIO
The LT^®3493-3 is a current mode PWM step-down DC/DC
converter with an internal 1.75A power switch. The wide
operating input range of 6.8V to 36V (40V maximum) makes
the LT3493-3 ideal for regulating power from a wide vari-
ety of sources, including unregulated wall transformers,
24V industrial supplies and automotive batteries. Its high
operating frequency allows the use of tiny, low cost induc-
tors 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.
, LT, LTC and LTM 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.
TYPICAL APPLICATIO
3.3V Step-Down Converter
V_IN
6.8V TO 36V
ON OFF
V_IN
BOOST
LT3493-3
SHDN
SW
GND FB
1µF
0.1µF _10µH
32.4k
10k
V_OUT
3.3V
1.2A, V_IN > 12V
1.1A, V_IN > 8V
22pF
10µF
3493-3 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
3493-3 TA01b
3493-3f
1