LTC1622CMS8 Linear Technology, LTC1622CMS8 Datasheet
LTC1622CMS8
Specifications of LTC1622CMS8
Available stocks
Related parts for LTC1622CMS8
LTC1622CMS8 Summary of contents
Page 1
... Li-Ion Powered Applications Cellular Telephones Wireless Modems Portable Computers Distributed 3.3V, 2.5V or 1.8V Power Systems Scanners Battery-Powered Equipment , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP are a trademarks of Linear Technology Corporation. U TYPICAL APPLICATIO V IN 2. ...
Page 2
... RATINGS (Note 1) Operating Temperature Range Commercial ............................................ Industrial ........................................... – Junction Temperature (Note 2) ............................. 125 C IN Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER – SENSE 1 LTC1622CMS8 RUN/SS 4 MS8 PART MARKING 8-LEAD PLASTIC SO LTDB T = 125 C, JMAX The denotes specifications which apply over the full operating = 25 C ...
Page 3
... Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note calculated from the ambient temperature T J dissipation P according to the following formula: D LTC1622CS8 • 150 C/W LTC1622CMS8 • 250 C/ TYPICAL PERFORMANCE CHARACTERISTICS Shutdown Current vs Supply Voltage ...
Page 4
LTC1622 W U TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load Current for Figure 1 with Burst Mode Operation Defeated 100 ...
Page 5
U U FUNCTIONAL DIAGRA V IN BURST DEFEAT SYNC/ 5 MODE OSC – 0. FREQ SHIFT 0.8V REFERENCE RUN/SS V REF 0.8V UVLO TRIP = 1.97V 6 GND ...
Page 6
LTC1622 U OPERATIO (Refer to Functional Diagram) the I pin will drop. When the 0.12V, the sleep signal goes high, turning off the external MOSFET. The sleep signal goes low when the I rises above 0.22V and ...
Page 7
U U APPLICATIONS INFORMATION The basic LTC1622 application circuit is shown in Figure 1. External component selection is driven by the load requirement and begins with the selection of L and R Next, the Power MOSFET and the output diode ...
Page 8
LTC1622 U U APPLICATIONS INFORMATION preferred at high switching frequencies, so design goals can concentrate on copper loss and preventing saturation. Ferrite core materials saturate “hard,” which means that the inductance collapses abruptly when the peak design current is exceeded. ...
Page 9
U U APPLICATIONS INFORMATION The allowable forward voltage drop in the diode is calcu- lated from the maximum short-circuit current as MAX where P is the allowable power dissipation and will be D determined ...
Page 10
LTC1622 U U APPLICATIONS INFORMATION 101 V REF 100 V 99 ITH 2.0 2.2 2.4 2.6 INPUT VOLTAGE (V) Figure 3. Line Regulation of V the maximum current sense voltage that sets the maxi- mum output ...
Page 11
U U APPLICATIONS INFORMATION 2 Transition Loss = 3 O(MAX) Other losses including C and C IN losses, and inductor core losses, generally account for less than 2% total additional loss. Run/Soft-Start Function The RUN/SS pin is ...
Page 12
LTC1622 U U APPLICATIONS INFORMATION down to 2.7V. Let’s assume that the MOSFET dissipation limited 250mW and its thermal resistance C/W. Hence the junction temperature at T will be 37.5 C ...
Page 13
U TYPICAL APPLICATIONS LTC1622 1.8V/1.5A Regulator with Burst Mode Operation Disabled V IN 2.5V TO 8.5V 1 SENSE LTC1622 10K RUN/ 220pF SS C4 560pF C1: AVX TPSD476M016R0150 C2: AVX TPSD227M006R0100 ...
Page 14
LTC1622 U TYPICAL APPLICATIONS LTC1622 2.5V/3A Regulator with External Frequency Synchronization R1 10k C3 220pF C1: AVX TPSD476M016R0150 C2: AVX TPSD107M010R0065 D1: MOTOROLA MBR320T3 D2 1N4818 R1 47k C3 470pF C4 0.1 F C1: AVX TPSD476M016R0150 C2: AVX TPSD107M010R0080 D1: ...
Page 15
... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...
Page 16
... Low Supply Voltage Range: 2.65V to 8V, 0.5A Antiphase Drive, 3.5V V 36V, Protection IN 6-Lead SOT-23, 2.5V V 9.8V, 550kHz IN Burst Mode Operation, Protection, 3.5V V sn1622 1622fs LT/TP 1001 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998 = 4.2V = 0.025 1000 1622 TA05b 1 1622 TA06b IN 6V ...