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Linear Technology Corporation - 40V 400mA Step-Down Switching Regulator

Numéro de référence LT3668IMSE
Description 40V 400mA Step-Down Switching Regulator
Fabricant Linear Technology Corporation 
Logo Linear Technology Corporation 





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LT3668IMSE fiche technique
LT3668
Features
40V 400mA Step-Down
Switching Regulator with Dual
Fault Protected Tracking LDOs
Description
n Dual Low Dropout Linear Tracking Regulators
200mA Outputs with Programmable Current Limits
1.6V to 45V Input Range
Fault Protected to ±45V
n Triple Output Supply from a Single Input Requires
Only One Inductor
n IQ = 50μA at 12VIN to 6V and 5V with No Load
n Buck Regulator:
Low Ripple (<15mVP-P) Burst Mode Operation®
400mA Output with Internal Power Switch
4.3V to 40V Input Operation Range (60V Max)
n Adjustable 250kHz to 2.2MHz Switching Frequency
n Power Good Indicator
n Available in a Thermally-Enhanced 16-Lead MSOP
Package
Applications
n Fault-Protected Sensor Supply
n Automotive and Industrial Supplies
n Power for Portable Instrumentation
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
The LT®3668 is a monolithic triple power supply composed
of a 400mA buck switching regulator and two 200mA low
dropout linear tracking regulators (LDOs).This provides a
complete and robust power solution for applications that
require the power supply of a sensor to tightly track the
power supply of a measurement ASIC.
Each tracking LDO supplies 200mA of output current with
a typical dropout voltage of 340mV, and each LDO has an
accurate resistor programmable current limit.
Internal protection circuitry includes reverse-battery
protection, current limiting, thermal limiting and reverse
current protection.
The buck regulator includes a high efficiency switch, a
boost diode, and the necessary oscillator, control and
logic circuitry. Current mode topology is used for fast
transient response and good loop stability. Low ripple
Burst Mode operation maintains high efficiency at low
output currents while keeping output ripple below 15mV
in a typical application.
The LT3668 is available in a thermally-enhanced 16-lead
MSOP package with exposed pad for low thermal resis-
tance.
Typical Application
VIN
7V TO 40V
TRANSIENT
TO 60V
4.7µF IN1
BOOST
SW
ON OFF
f = 600kHz 174k
EN
PG
RT
LT3668
DA
IN3/BD
IN2
FB1
5V
150mA
(FOLLOWS
OUT3)
10µF
ADJ2
OUT2
ADJ3
OUT3
EN2/ILIM2 GND EN3/ILIM3
0.22µF 27µH
22pF
232k
931k
294k
10µF
5V
150mA
6V
100mA
22µF
3668 TA01a
For more information www.linear.com/LT3668
100
90
80
70
60
50
40
30
20
10
0
5
No-Load Supply Current
10 15 20 25 30
INPUT VOLTAGE (V)
35
3668 TA01b
3668f
1

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