LTC3204 LINER [Linear Technology], LTC3204 Datasheet
LTC3204
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LTC3204 Summary of contents
Page 1
... The LTC3204-3.3/LTC3204B-3.3 can produce a regulated output voltage of 3.3V from a minimum input voltage of 1.8V (2 alkaline cells) whereas the LTC3204-5/LTC3204B-5 can produce 5V from a minimum of 2.7V (Li-Ion battery) input. = 48µA Q LTC3204-3.3/LTC3204-5 feature automatic Burst Mode operation at light loads to maintain low supply current whereas LTC3204B-3 ...
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... EXPOSED PAD IS GND (PIN 7) MUST BE SOLDERED TO PCB Consult LTC Marketing for parts specified with wider operating temperature ranges. The denotes the specifications which apply over the full operating ● = 25° 2.4V (LTC3204-3.3/LTC3204B-3.3) or 3.6V (LTC3204-5/LTC3204B-5 2.2µF unless otherwise noted. OUT < 4.5V, I < 40mA ...
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... SUPPLY VOLTAGE (V) 3204 G01 S H D N LO-to-HI Threshold vs Temperature 0.9 0 3. 1.8V 0.6 IN 0.5 –50 50 100 150 0 TEMPERATURE (°C) 3204 G04 LTC3204-3.3/LTC3204-5/ LTC3204B-3.3/LTC3204B-5 CE CHARACTERISTICS Oscillator Frequency vs Temperature 1 1 1.0 0.9 0.8 4.5 –50 – TEMPERATURE (°C) S H D N HI-to-LO Threshold vs Temperature ...
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... MODE 0.8 OPERATION) 0.1 0.6 0.4 0.2 0 0.01 0.01 0 LOAD CURRENT (mA) Output Ripple V OUT 20mV/DIV (AC COUPLED) 500ns/DIV 50mA LOAD (LTC3204-3.3/LTC3204B-3.3 ONLY) Effective Open-Loop Output Resistance vs Temperature 1. OUT 90° –45° –50 3.0 3.5 0 TEMPERATURE (°C) 3204 G08 Efficiency vs Supply Voltage 100 90 80 ...
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... LTC3204-5 (BURST-MODE 2.0 OPERATION) 1.6 0.1 1.2 0.8 0.4 0 0.01 0.01 0 LOAD CURRENT (mA) Output Ripple V OUT 20mV/DIV (AC COUPLED) 500ns/DIV 100mA OUT (LTC3204-5/LTC3204B-5 ONLY) Effective Open-Loop Output Resistance vs Temperature 2. 4.5V OUT 25° –50 0 3.9 4.2 TEMPERATURE (°C) 3204 G17 Efficiency vs Supply Voltage 100 90 THEORETICAL MAX 80 ...
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... Flying Capacitor Positive Terminal. – C (Pin 5): Flying Capacitor Negative Terminal. S H D N (Pin 6): Active Low Shutdown Input. A low on S H D N disablestheLTC3204-3.3/LTC3204-5/LTC3204B-3.3/ should be bypassed IN LTC3204B-5. This pin must not be allowed to float. should be OUT SOFT-START SWITCH CONTROL 3 1.2MHz OSCILLATOR – ...
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... However, this current will be eliminated if the output voltage (V less than approximately 0.8V. Burst Mode Operation The LTC3204-3.3/LTC3204-5 provide automatic Burst Mode operation to reduce supply current at light loads. Burst Mode operation is initiated if the output load current falls below an internally programmed threshold. Once LTC3204-3 ...
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... U U Power Efficiency The power efficiency (η) of the LTC3204-3.3/LTC3204-5/ LTC3204B-3.3/LTC3204B-5 is similar to that of a linear regulator with an effective input voltage of twice the actual input voltage. This occurs because the input current for a voltage doubling charge pump is approximately twice the output current ideal regulating voltage doubler the power effi ...
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... Excessive ESR on the output capacitor can degrade the loop stability of the LTC3204-3.3/LTC3204-5/LTC3204B-3.3/ LTC3204B-5. The closed loop output resistance of the LTC3204-5 is designed to be 0.5Ω. For a 100mA load current change, the output voltage will change by about 50mV. If the output capacitor has 0.5Ω or more of ESR, ...
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... Y5V ceramic capacitor in a 0603 case may not provide any more capacitance than a 0.22µF 10V X7R capacitor avail- able in the same 0603 case. In fact, for most LTC3204-3.3/ LTC3204-5/LTC3204B-3.3/LTC3204B-5applications,these capacitors can be considered roughly equivalent. The capacitor manufacturer’ ...
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... APPLICATIO S I FOR ATIO U U This can be achieved from a printed circuit board layout with a solid ground plane and a good connection to the ground pins of LTC3204-3.3/LTC3204-5/LTC3204B-3.3/ LTC3204B-5 and the exposed pad of the DFN package. PACKAGE DESCRIPTIO 2.50 ±0.05 0.61 ±0.05 1.15 ±0.05 (2 SIDES) 0.50 BSC 1.42 ± ...
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... LTC3204B-3 GND 6 OFF ON SHDN Lithium-Ion Battery to 5V White or Blue LED Driver 2.2µ – OUT 100Ω 2.2µF LTC3204-5/ LTC3204B SHDN GND V SHDN t USB Port to Regulated 5V Power Supply 2.2µF 5 – OUT LTC3204-5 2.2µF 6 ...