LTC3532 LINER [Linear Technology], LTC3532 Datasheet
LTC3532
Available stocks
Related parts for LTC3532
LTC3532 Summary of contents
Page 1
... Burst Mode operation or to control it manually. Other features include a 1μA shutdown, soft-start control, thermal shutdown, and peak current limit. The LTC3532 is available in a low profi le (0.75mm) 10-lead (3mm × 3mm) DFN and 10-lead MSOP packages. ...
Page 2
... TAPE AND REEL LTC3532EDD#PBF LTC3532EDD#TRPBF LTC3532EMS#PBF LTC3532EMS#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, otherwise specifi ...
Page 3
... Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3532E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlations with statistical process controls ...
Page 4
... LTC3532 W TYPICAL PERFOR A CE CHARACTERISTICS Effi ciency vs Frequency 100 3. 3.3V OUT 80 500 1000 1500 FREQUENCY (kHz) 3532 G04 Frequency vs Temperature 1200 1150 1100 1050 1000 950 900 850 V = 3.6V IN 800 –55 – TEMPERATURE (°C) 3532 G07 ...
Page 5
... OUT capacitor is placed from V V (Pin 7): Input Supply Pin. Supplies current to the IN inductor through SW1 and supplies internal V IC. A ceramic bypass capacitor as close to the V GND (Pin 5) is required. LTC3532 = 25°C, unless otherwise specifi ed. Burst Mode, Boost SW1 5V/DIV SW2 5V/DIV V ...
Page 6
... LTC3532 CTIO S SHDN/SS (Pin 8): Combined Soft-Start and Shutdown. Grounding this pin shuts down the IC. Tie to >1.5V to enable the IC and >2.4V to ensure the error amp is not clamped from soft-start. For Burst Mode operation, this pin must be pulled up to within 0. shutdown command signal to this pin will provide a soft- start function by limiting the rise time of the V FB (Pin 9): Feedback Pin ...
Page 7
... Control Figure 1 shows a simplifi ed diagram of how the four internal switches are connected to the inductor, V Figure 2 shows the regions of operation for the LTC3532 as a function of the internal control voltage the control voltage, the IC will operate in either buck, buck/boost or boost mode. The V ...
Page 8
... LTC3532 U OPERATIO 88% D MAX BOOST A ON, B OFF BOOST REGION PWM CD SWITCHES D MIN BOOST BUCK/BOOST REGION FOUR SWITCH PWM D MAX BUCK D ON, C OFF BUCK REGION PWM AB SWITCHES 0% DUTY CYCLE Figure 2. Switch Control vs Internal Control Voltage, V Buck Region (V > OUT Switch D is always on and switch C is always off dur- ing this mode ...
Page 9
... BURST should be able to sink up to 10.5V 2mA. For optimum transient response with large dynamic R loads, the operating mode should be controlled manually BURST by the host. By commanding fi xed frequency operation 7V prior to a sudden increase in load, output voltage droop can R BURST LTC3532 V OUT 6 V OUT D ≈ – 250mA ...
Page 10
... During long periods of Burst Mode operation, leakage currents in the external components or on the PC board could cause the compensation capacitor to charge (or discharge), which could result in a large output transient when returning to fi xed frequency mode of operation, even at the same load current. To prevent this, the LTC3532 V IN SOFT-START CLAMP ...
Page 11
... High Current are Direct. Trace area at FB and V Low. Lead Length to Battery Should be Kept Short Inductor Selection The high frequency operation of the LTC3532 allows the use of small surface mount inductors. The inductor ripple current is typically set to 20% to 40% of the maximum inductor current. For a given ripple the inductance terms ...
Page 12
... Closing the Feedback Loop The LTC3532 incorporates voltage mode PWM control. The control to output gain varies with operation region (buck, boost, buck/boost), but is usually no greater than 15. The output fi lter exhibits a double pole response, as ...
Page 13
... ZERO2 f = POLE2 where resistance is in ohms and capacitance is in far- ads. V OUT 3532 F07 Figure 8. Error Amplifi er with Type lll Compensation LTC3532 • π • 32e • R1• CP1 • π • R • • π • R1• C ...
Page 14
... SHDN SHDN/SS FB LTC3532 BURST BURST GND T 0.01μF R4 86.6k Li-Ion to 5V Boost Converter with Output Disconnect L1 2.2μH SW1 SW2 SW1 SW2 OUT SHDN FB SHDN/SS FB LTC3532 V C BURST BURST GND T R4 28.7k V 3.3V 300mA R1 R9 340k 1k SW2 FB C4 150pF 12.1k 150pF C3 22μ ...
Page 15
... MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661 Rev E) DETAIL “A” 0.254 (.010) 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) LTC3532 R = 0.115 TYP 6 10 3.00 ±0.10 1.65 ± 0.10 (4 SIDES) (2 SIDES) 5 0.75 ±0.05 2.38 ±0.10 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW— ...
Page 16
... OUT LTC3531-3.3/ DC/DC Converters in SOT-23 LTC3531-3 Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● L1 2.2μH SW1 SW2 SW1 SW2 OUT FB SHDN/SS FB LTC3532 BURST V C BURST GND T R4 28.7k C5 0.01μF COMMENTS V : 2.5V to 5.5V 2.5V to 5.5V OUT(RANGE ...