LTM8033IV#PBF Linear Technology, LTM8033IV#PBF Datasheet

Page 1

... L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...

Page 2

... LEAD FREE FINISH TRAY LTM8033EV#PBF LTM8033EV#PBF LTM8033IV#PBF LTM8033IV#PBF LTM8033MPV#PBF LTM8033MPV#PBF 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: This product is only offered in trays. For more information go to: ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T PARAMETER Output RMS Voltage Ripple Switching Frequency Voltage at ADJ Pin Current Out of ADJ Pin Minimum BIAS Voltage for Proper Operation RUN/SS Pin Current RUN/SS Input High Voltage RUN/SS Input ...

Page 4

LTM8033 TYPICAL PERFORMANCE CHARACTERISTICS 8V Efficiency OUT 95 12V 36V 24V 500 1000 1500 2000 2500 OUTPUT CURRENT (mA) 8033 G04 Bias Current vs Load Current, 2.5V ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Input Current vs Input Voltage Output Shorted 1000 900 800 700 600 500 400 300 200 100 INPUT VOLTAGE (V) 8033 G13 Input Current vs Output Current 5V OUT 1600 1400 1200 ...

Page 6

LTM8033 TYPICAL PERFORMANCE CHARACTERISTICS Minimum Required Input Voltage vs Load Current, 3.3V OUT 6.0 5.5 TO START, WITH RUN = V IN 5.0 RUN/SS CONTROLLED START 4.5 4.0 TO RUN 3.5 3.0 0 500 1000 1500 2000 2500 LOAD CURRENT ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Temperature Rise vs Load Current, 5V OUT 24V 500 1000 1500 LOAD CURRENT (mA) Temperature Rise vs Load Current, 12V OUT ...

Page 8

LTM8033 PIN FUNCTIONS V (Bank 1): Power Output Pins. Apply the output filter OUT capacitor and the output load between these pins and GND pins. GND (A8, Bank 2): Tie these GND pins to a local ground plane below the ...

Page 9

BLOCK DIAGRAM V IN EMI FILTER FIN RUN/SS SHARE SYNC 8.2μH CURRENT MODE CONTROLLER GND RT PGOOD LTM8033 V OUT 15pF 1μF 499k AUX BIAS ADJ 8033 BD 8033f 9 ...

Page 10

LTM8033 OPERATION The LTM8033 is a standalone nonisolated step-down switching DC/DC power supply that can deliver output current EMC product; its radiated emissions are so quiet that it can pass the stringent requirements ...

Page 11

APPLICATIONS INFORMATION For most applications, the design process is straight for- ward, summarized as follows: • Look at Table 1 and find the row that has the desired input range and output voltage. • Apply the recommended ...

Page 12

LTM8033 APPLICATIONS INFORMATION Table 1. Recommended Component Values and Configuration ( OUT IN 3.6V to 36V 0.8V 4.7μF , 50V, 1206 3.6V to 36V 1V 4.7μF , 50V, 1206 3.6V to 36V 1.2V 4.7μF , 50V, ...

Page 13

APPLICATIONS INFORMATION Frequency Selection The LTM8033 uses a constant frequency PWM architecture that can be programmed to switch from 200kHz to 2.4MHz by using a resistor tied from the RT pin to ground. Table 2 provides a list of R ...

Page 14

LTM8033 APPLICATIONS INFORMATION no-load condition, the percentage of time that the LTM8033 operates in sleep mode increases and the average input current is greatly reduced, resulting in higher efficiency. Burst Mode operation is enabled by tying SYNC to GND. To ...

Page 15

APPLICATIONS INFORMATION Synchronization The internal oscillator of the LTM8033 can be synchro- nized by applying an external 250kHz to 2MHz clock to the SYNC pin. Do not leave this pin floating. Ground the SYNC pin if the synchronization function is ...

Page 16

LTM8033 APPLICATIONS INFORMATION PCB Layout Most of the headaches associated with PCB layout have been alleviated or even eliminated by the high level of integration of the LTM8033. The LTM8033 is neverthe- less a switching power supply, and care must ...

Page 17

... Typical Performance Characteristics section, while further data, operating conditions and test set-up are detailed in the electromagnetic compatibility test report, available on the Linear Technology website. Conducted emissions requirements may be met by adding an appropriate input power line filter. The proper implementation of this filter depends upon the system operating and performance ...

Page 18

LTM8033 APPLICATIONS INFORMATION While the meaning of each of these coefficients may seem to be intuitive, JEDEC has defined each to avoid confu- sion and inconsistency. These definitions are given in JESD 51-12, and are quoted or paraphrased in the ...

Page 19

APPLICATIONS INFORMATION resulting in impaired performance or reliability. Please refer to the PCB Layout section for printed circuit board design suggestions. The LTM8033 is equipped with a thermal shutdown that will inhibit power switching at high junction temperatures. The activation ...

Page 20

LTM8033 TYPICAL APPLICATIONS 4.1V TO 36V 4.7μ 7.5V TO 36VDC V IN 11V TO 36V 20 2.5V Step-Down Converter LTM8033 OUT SHARE AUX 2.8V to 25V BIAS RUN/SS PGOOD FIN 10μF RT ...

Page 21

TYPICAL APPLICATIONS 4.8V TO 36V OPTIONAL SYNCHRONIZATION CLOCK 4.7μF * RUNNING VOLTAGE RANGE. PLEASE REFER TO THE APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS. NOTE: SYNCHRONIZE THE TWO MODULES TO AVOID BEAT FREQUENCIES, IF NECESSARY. OTHERWISE, TIE EACH ...

Page 22

LTM8033 PACKAGE DESCRIPTION PIN NAME PIN NAME OUT OUT OUT A4 GND B4 A5 GND B5 A6 SHARE B6 A7 ADJ B7 PGOOD A8 GND B8 SYNC PIN ...

Page 23

... PACKAGE DESCRIPTION Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights bbb 4.445 3.175 1.905 ...

Page 24

... COMMENTS EN55022 Class B Compliant, 3.6V ≤ V EN55022 Class B Compliant, 3.6V ≤ V www.linear.com ● V OUT 3.3V 3A 100μF ≤ 36V; 0.8V ≤ V ≤ 10V IN OUT ≤ 36V; 0.8V ≤ V ≤ 10V IN OUT LT 0710 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2010 8033f ...