Datasheet LTC3838 (Analog Devices) - 3

LTC3838
orDer inForMaTion (http://www.linear.com/product/LTC3838#orderinfo) LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3838EUHF#PBF LTC3838EUHF#TRPBF 3838 38-Lead (5mm × 7mm) Plastic QFN –40°C to 125°C LTC3838IUHF#PBF LTC3838IUHF#TRPBF 3838 38-Lead (5mm × 7mm) Plastic QFN –40°C to 125°C LTC3838EFE#PBF LTC3838EFE#TRPBF LTC3838FE 38-Lead Plastic TSSOP –40°C to 125°C LTC3838IFE#PBF LTC3838IFE#TRPBF LTC3838FE 38-Lead Plastic TSSOP –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted (Note 3). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VIN Input Voltage Operating Range 4.5 38 V VOUT1,2(REG) Regulated Output Voltage Operating Range VOUT1 Regulated Differentially with Respect to 0.6 5.5 V V – OUTSENSE1 , VOUT2 Regulated with Respect to SGND IQ Input DC Supply Current Both Channels Enabled MODE/PLLIN = 0V, No Load 3 mA Only One Channel Enabled RUN1 or RUN2 (But Not Both) = 0V 2 mA Shutdown Supply Current RUN1 = RUN2 = 0V 15 µA VOUTSENSE1(REG) Regulated Differential Feedback Voltage on ITH1 = 1.2V (Note 5) Channel 1 (V + – OUTSENSE1 – VOUTSENSE1 ) TA = 25°C 0.5985 0.6 0.6015 V TA = 0°C to 85°C l 0.596 0.6 0.604 V TA = –40°C to 125°C l 0.594 0.6 0.606 V Regulated Differential Feedback Voltage on VIN = 4.5V to 38V, ITH1 = 0.5V to 1.9V (Note 5), Channel 1 Over Line, Load and Common –0.5V < V – OUTSENSE1 < 0.5V Mode TA = 0°C to 85°C l 0.594 0.6 0.606 V TA = –40°C to 125°C l 0.591 0.6 0.609 V VFB2(REG) Regulated Feedback Voltage on Channel 2 ITH2 = 1.2V (Note 5) TA = 25°C 0.597 0.6 0.603 V TA = 0°C to 85°C l 0.594 0.6 0.606 V TA = –40°C to 125°C l 0.592 0.6 0.608 V Regulated Feedback Voltage on Channel 2 VIN = 4.5V to 38V, ITH2 = 0.5V to 1.9V (Note 5) Over Line, Load TA = 0°C to 85°C l 0.592 0.6 0.608 V TA = –40°C to 125°C l 0.588 0.6 0.612 V I + + + – VOUTSENSE1 VOUTSENSE1 Input Bias Current VOUTSENSE1 – VOUTSENSE1 = 0.6V ±5 ±25 nA I – – + – VOUTSENSE1 VOUTSENSE1 Input Bias Current VOUTSENSE1 – VOUTSENSE1 = 0.6V –25 –50 µA IVFB2 VFB2 Input Bias Current VFB2 = 0.6V –5 ±50 nA gm(EA)1,2 Error Amplifier Transconductance ITH = 1.2V (Note 5) 1.7 mS tON(MIN)1,2 Minimum Top Gate On-Time VIN = 38V, VOUT = 0.6V, RT = 20k (Note 6) 30 ns tOFF(MIN)1,2 Minimum Top Gate Off-Time (Note 6) 90 ns 3838fb For more information www.linear.com/LTC3838 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts