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LT3694 Datasheet(PDF) 1 Page - Linear Technology |
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LT3694 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 34 page  LT3667 1 3667fb For more information www.linear.com/LT3667 TYPICAL APPLICATION FEATURES DESCRIPTION 40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs TheLT®3667isamonolithictriplepowersupplycomposed of a 400mA buck switching regulator and two 200mA low dropout linear regulators (LDOs). 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. Each 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 LT3667 is available in a thermally-enhanced 16-Lead MSOP and a 24-Pin 3mm x 5mm QFN package with ex- posed pad for low thermal resistance. No-Load Supply Current APPLICATIONS n Triple Output Supply from a Single Input Requires Only One Inductor n IQ = 50μA at 12VIN to 5V, 3.3V and 2.5V 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 Dual Low Dropout Linear Regulators 200mA Outputs with Programmable Current Limits 1.6V to 45V Input Range Fault Protected to ±45V n Adjustable 250kHz to 2.2MHz Switching Frequency n Synchronizable Between 300kHz and 2.2MHz n Programmable Undervoltage Lockout n Power Good Indicators n Available in a Thermally-Enhanced 16-Lead MSOP and 24-Lead (3mm × 5mm) QFN Packages n Automotive Battery Regulation n Power for Portable Instrumentation n Industrial Supplies n Fault-Protected Sensor Supply 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. EN2/ILIM2 EN3/ILIM3 GND IN1 LT3667 BOOST SW DA FB1 IN2 BD 2.5V 100mA IN3 OUT3 FB3 3667 TA01a ON OFF EN PG RT OUT2 FB2 UVLO1 4.7µF 0.22µF 22pF 22µH 931k 5V 200mA 3.3V 100mA 294k 340k 158k 499k 158k 174k VIN 6V TO 40V TRANSIENT TO 60V 22µF 4.7µF 2.2µF INPUT VOLTAGE (V) 5 0 10 30 40 50 100 70 15 25 30 3667 TA01b 20 80 90 60 10 20 35 |
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