LTC3528 LINER [Linear Technology], LTC3528 Datasheet
LTC3528
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LTC3528 Summary of contents
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... Additional features include a low shutdown current, open-drain power good output, short- circuit protection and thermal overload protection. The LTC3528/LTC3528B are offered in an 8-lead 3mm × 2mm × 0.75mm DFN package LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation ...
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... TAPE AND REEL LTC3528EDDB#PBF LTC3528EDDB#TRPBF LTC3528BEDDB#PBF LTC3528BEDDB#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS temperature range of – ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3528E is guaranteed to meet performance specifi cations from 0°C to 85°C. Specifi cations over –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Specifi ...
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... V (V) IN 3528 G05 Burst Mode Threshold Current 1.8V OUT 30 RISING 20 FALLING 1.1 1.2 1.3 1.4 V (V) IN 3528 G08 4 Effi ciency vs Load Current and V for (LTC3528) OUT 1000 100 EFFICIENCY 90 100 POWER 60 1 LOSS 1. 0.01 ...
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... TEMPERATURE (°C) Burst Mode Quiescent Current vs V (LTC3528) OUT 13 1.2V IN 12.5 11.5 10 (V) OUT LTC3528/LTC3528B (T = 25°C unless otherwise noted DS(ON) OUT 450 = 3V 400 350 300 PMOS 250 200 NMOS 150 100 1.5 2 2.5 3 3.5 5 4.5 V (V) ...
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... V OUT 100mV/DIV LOAD CURRENT 200mA/DIV 3528 G21 V = 3.6V 20μs/DIV OUT C = 10μF OUT L = 4.7μH Load Step Response (Burst Mode Operation, 1.2V to 3.3V, LTC3528) V OUT 100mV/DIV LOAD CURRENT 100mA/DIV 3528 G24 V = 1.2V 50μs/DIV 3.3V OUT C = 10μF OUT L = 4.7μH to the output fi lter capacitor (4.7μF minimum) to minimize EMI ...
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... GATE DRIVERS AND ANTI-CROSS SHUTDOWN CONDUCTION Σ PK COMP V REF – PK UVLO + I ZERO MODE LOGIC CONTROL CLK (LTC3528) BURST – 10% TSD WAKE SGND 7 LTC3528/LTC3528B WELL SWITCH V OUT – ZERO R1 COMP SLOPE COMP ERROR AMP SLEEP COMP + V REF – FB CLAMP SOFT-START EXPOSED ...
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... N-chan- DS(ON) nel MOSFET switch and P-channel MOSFET synchronous rectifi er, the LTC3528 achieves high effi ciency over a wide range of load current. Burst Mode operation maintains high effi ciency at very light loads, reducing the quiescent current to 12μA. Operation can be best understood by referring to the Block Diagram ...
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... The regulator will also leave Burst Mode operation if a load transient occurs which causes the inductor current to repeatedly reach current limit. Once the LTC3528 has left OUT Burst Mode operation and returned to normal operation, it will remain there until the output load is reduced below ...
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... OUT that this defeats the output disconnect and short-circuit protection features. PCB LAYOUT GUIDELINES The high speed operation of the LTC3528/LTC3528B de- mands careful attention to board layout. A careless layout will not produce the advertised performance. Figure 1 shows the recommended component placement. A large ground copper area with the package backside metal pad Figure 1 ...
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... Molded chokes and some chip inductors usually do not have enough core area to support the peak inductor currents of 1.5A seen on the LTC3528/LTC3528B. To minimize radiated noise, use a shielded inductor. See Table 1 for suggested components and suppliers. Table 1. Recommended Inductors ...
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... LTC3528 PGOOD FB SHDN OFF ON GND Dual 1 Cell to 1.8V, 3V Sequenced Supply 4.7μ 0.88V TO 1.6V 475k LTC3528 4.7μF PGOOD SHDN OFF ON 4.7μ 4.7μF LTC3528 PGOOD SHDN 12 V OUT 1.8V 250mA 33pF 499k 10μF 1M 3528 TA02a SW V OUT1 V 1.8V OUT 250mA 33pF 499k FB 10μF ...
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... LTC3528 PGOOD FB SHDN OFF ON GND 100 V OUT 3.3V 200mA 33pF 499k 10μF 287k 3528 TA04a 100 V OUT 3.3V 400mA 499k 33pF 10μF 287k 3528 TA05a LTC3528/LTC3528B Effi ciency 0.01 0 100 1000 LOAD CURRENT (mA) 3528 TA04b Effi ciency ...
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... TYPICAL APPLICATIONS 2 Cell to 5V 4.7μ OUT 1.8V TO 3.2V 4.7μF LTC3528 PGOOD FB SHDN OFF ON GND Li-Ion to 5V 4.7μ OUT 2.7V TO 4.2V 4.7μF LTC3528 PGOOD FB SHDN OFF ON GND 14 100 OUT 5V 70 300mA 1M 60 22μF 50 316k 40 3528 TA06a 30 0.01 100 OUT ...
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... LTC DWG # 05-08-1702 Rev B) 0.70 ±0.05 PACKAGE OUTLINE 0.50 BSC 2.20 ±0.05 (2 SIDES 0.115 3.00 ±0.10 TYP R = 0.05 (2 SIDES) TYP 2.00 ±0.10 (2 SIDES) 0.56 ± 0.05 (2 SIDES) 4 0.25 ± 0.05 0.75 ±0.05 0 – 0.05 BOTTOM VIEW—EXPOSED PAD LTC3528/LTC3528B 0.40 ± 0. PIN 0.20 OR 0.25 × 45° CHAMFER 1 (DDB8) DFN 0905 REV B 0.50 BSC 2.15 ±0.05 (2 SIDES) 3528fa 15 ...
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... LTC3528/LTC3528B RELATED PARTS PART NUMBER DESCRIPTION LTC3400/LTC3400B 600mA I , 1.2MHz, Synchronous Step-Up SW DC/DC Converters LTC3401 3MHz, Synchronous Step-Up DC/DC Converter SW LTC3402 3MHz, Synchronous Step-Up DC/DC Converter SW LTC3421 3MHz, Synchronous Step-Up DC/DC Converter SW with Output Disconnect LTC3422 1. 3MHz Synchronous Step-Up DC/DC Converter SW with Output Disconnect ...