ltc3225 Linear Technology Corporation, ltc3225 Datasheet
ltc3225
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ltc3225 Summary of contents
Page 1
... When the input supply is removed, the LTC3225 automatically enters a low current state, drawing less than 1μA from the supercapacitors. The LTC3225 is available in a 10-lead 3mm × 2mm DFN package. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...
Page 2
... Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL LTC3225EDDB#TRMPBF LTC3225EDDB#TRPBF TRM = 500 pieces. Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...
Page 3
... V = 4.5V IN OUT Note 3: The LTC3225 is guaranteed to meet performance specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: Output not in regulation; ...
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... LTC3225 TYPICAL PERFORMANCE CHARACTERISTICS (T = 25° 1μ 2.2μ FLY IN TOP Extra Input Current vs Output Current (I – 2 • VIN OUT 3. 4.5V OUT 100 120 140 160 I (mA) OUT 3225 G04 Oscillator Frequency vs Supply Voltage ...
Page 5
... OUT the top and bottom supercapacitors. SHDN (Pin 4): Active Low Shutdown Input. A low on SHDN puts the LTC3225 in low current shutdown mode. Do not fl oat the SHDN pin. PGOOD (Pin 5): Open-Drain Output Status Indicator. Upon start-up, this open-drain pin remains low until the output voltage within 6% (typical) of its fi ...
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... LTC3225 SIMPLIFIED BLOCK DIAGRAM 1.2V RUN i PROG 7 R PROG 1.2V V REF 1.088V V SEL FLY – SHDN SOFT-START AND SHUTDOWN CONTROL 3000i CHARGE PUMP CLK RUN/STOP OSCILLATOR – – 2% REF V – 6% REF V – 7.2% REF Figure UVLO THERMAL ...
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... It will enable the charge pump once the junction temperature drops back to approximately 135°C. The LTC3225 is able to cycle in and out of thermal shutdown indefi nitely without latch-up or damage until the overcurrent condition is removed. ...
Page 8
... This mode prevents damage to the part by shutting down the internal charge pump. Power Effi ciency The power effi ciency (η) of the LTC3225 is similar to that of a linear regulator with an effective input voltage of twice the actual input voltage ideal regulating voltage doubler the power effi ciency is given by: ...
Page 9
... Tantalum and aluminum capacitors are not IN recommended because of their high ESR. The input current to the LTC3225 is relatively constant dur- ing both the input charging phase and the output charging phase but drops to zero during the clock non-overlap times. Since the non-overlap time is small (~40ns) these missing “ ...
Page 10
... To prevent capacitive energy transfer, a Faraday shield may be used. This is a grounded PC trace between the sensitive node and the LTC3225 pins. For a high quality AC ground it should be returned to a solid ground plane that extends all the way to the LTC3225. ...
Page 11
... Plastic DFN (3mm × 2mm) (Reference LTC DWG # 05-08-1722 Rev Ø) 0.70 0.05 PACKAGE OUTLINE 0.50 BSC 2.39 0.05 (2 SIDES 0.115 3.00 0.10 TYP R = 0.05 (2 SIDES) 6 TYP 2.00 0.10 (2 SIDES) 0.64 0.05 (2 SIDES) 5 0.25 0.05 0.75 0.05 0 – 0.05 BOTTOM VIEW—EXPOSED PAD LTC3225 0.40 0.10 10 PIN 0.20 OR 0.25 45 CHAMFER 1 (DDB10) DFN 0905 REV Ø 0.50 BSC 2.39 0.05 (2 SIDES) 3225f 11 ...
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... C CX 1μF – C GND 10V Si4410DY IRF7424 CHARGER OUT LTC3225 + 1μF – C GND 10V 3225 TA03 : 2.2V to 16V < 1μA, ThinSOT Package SD < 1μA, 2mm × 3mm 6-Lead DFN Package SD < 1μA, 3mm × 3mm 10-Lead DFN Driver SD LT 0508 • ...