Datasheet LTC7890 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | Low IQ, Dual, 2-Phase Synchronous Step-Down Controller for GaN FETs in 40-Lead QFN (6mm x 6mm, Plastic Side Wettable) package |
| Seiten / Seite | 41 / 6 — LTC7890. ABSOLUTE MAXIMUM RATINGS. Table 2. Absolute Maximum Ratings. … |
| Dateiformat / Größe | PDF / 1.9 Mb |
| Dokumentensprache | Englisch |
LTC7890. ABSOLUTE MAXIMUM RATINGS. Table 2. Absolute Maximum Ratings. Parameter. Rating. ESD CAUTION
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LTC7890 ABSOLUTE MAXIMUM RATINGS Table 2. Absolute Maximum Ratings
Stresses at or above those listed under Absolute Maximum Ratings
Parameter Rating
may cause permanent damage to the product. This is a stress Input Supply (V rating only; functional operation of the product at these or any other IN) –0.3 V to +100 V RUN1 and RUN2 –0.3 V to +100 V conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operat- BOOST1 and BOOST2 –0.3 V to +106 V ing conditions for extended periods may affect product reliability. SW1 and SW2 –5 V to +100 V BOOST1 to SW1 and BOOST2 to SW2 –0.3 V to +6 V
ESD CAUTION
BGUP1, BGDN1, BGUP2, and BGDN21 Not applicable TGUP1, TGDN1, TGUP2, and TGDN21 Not applicable
ESD (electrostatic discharge) sensitive device
. Charged devi- ces and circuit boards can discharge without detection. Although EXTVCC –0.3 V to +30 V this product features patented or proprietary protection circuitry, DRVCC and INTVCC –0.3 V to +6 V damage may occur on devices subjected to high energy ESD. VFB1 –0.3 V to +15 V Therefore, proper ESD precautions should be taken to avoid VFB2 –0.3 V to +6 V performance degradation or loss of functionality. PLLIN/SPREAD and FREQ –0.3 V to +6 V TRACK/SS1, TRACK/SS2, ITH1, and ITH2 –0.3 V to +6 V DRVSET and DRVUV –0.3 V to +6 V MODE, ILIM, and VPRG1 –0.3 V to +6 V PGOOD1 and PGOOD2 –0.3 V to +6 V DTCA and DTCB –0.3 V to +6 V SENSE1+, SENSE2+, SENSE1–, and SENSE2– –0.3 V to +65 V SENSE1+ to SENSE1– and SENSE2+ to SENSE2– Continuous –0.3 V to +0.3 V <1 ms –100 mA to +100 mA Operating Junction Temperature Range2 –40°C to +150°C Storage Temperature Range –65°C to +150°C 1 Do not apply a voltage or current source to these pins. They must be connect- ed to capacitive loads only. Otherwise, permanent damage can occur. 2 The LTC7890 is specified over the –40°C to 150°C operating junction temper- ature range. High junction temperatures degrade operating lifetimes. Note the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with the board layout, rated package thermal impedance, and other environmental factors. The junction temperature (TJ, in °C) is calculated from the ambient temperature (TA, in °C) and power dissipation (PD, in Watts) according to the following formula: TJ = TA + (PD × θJA), where θJA is the package thermal impedance and equals 34°C/W for the 40-lead (6 mm × 6 mm), side wettable, quad flat no lead (QFN) package.
analog.com Rev. 0 | 6 of 41
Document Outline Features Applications Typical Application Circuit General Description Specifications Electrical Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Functional Diagram Main Control Loop Power and Bias Supplies (VIN, EXTVCC, DRVCC, and INTVCC) High-Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Startup and Shutdown (RUNx and TRACK/SSx Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping Mode, or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Output Overvoltage Protection Foldback Current Power-Good Applications Information Inductor Value Calculation Inductor Core Selection Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Current Sensing Setting the Operating Frequency Selecting the Light Load Operating Mode Dead Time Control (DTCA and DTCB Pins) DTCx Pins Tied to GND (Adaptive Dead Time Control) DTCx Pins Tied to INTVCC (Smart Near Zero Dead Time Control) DTCx Pins Connected with a Resistor to GND Power FET Selection CIN and COUT Selection Setting the Output Voltage RUNx Pins and Undervoltage Lockout Soft Start and Tracking (TRACK/SSx Pin) 2-Phase Single Output Operation INTVCC Regulators (OPTI-DRIVE) Topside FET Driver Supply (CB) Minimum On-Time Considerations Fault Conditions: Current Limit and Foldback Fault Conditions: Overvoltage Protection Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Efficiency Considerations Checking Transient Response Design Example PCB Layout Checklist PCB Layout Debugging Typical Applications Related Products Outline Dimensions Ordering Guide Evaluation Boards
LTC7890 ABSOLUTE MAXIMUM RATINGS Table 2. Absolute Maximum Ratings
Stresses at or above those listed under Absolute Maximum Ratings
Parameter Rating
may cause permanent damage to the product. This is a stress Input Supply (V rating only; functional operation of the product at these or any other IN) –0.3 V to +100 V RUN1 and RUN2 –0.3 V to +100 V conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operat- BOOST1 and BOOST2 –0.3 V to +106 V ing conditions for extended periods may affect product reliability. SW1 and SW2 –5 V to +100 V BOOST1 to SW1 and BOOST2 to SW2 –0.3 V to +6 V
ESD CAUTION
BGUP1, BGDN1, BGUP2, and BGDN21 Not applicable TGUP1, TGDN1, TGUP2, and TGDN21 Not applicable
ESD (electrostatic discharge) sensitive device
. Charged devi- ces and circuit boards can discharge without detection. Although EXTVCC –0.3 V to +30 V this product features patented or proprietary protection circuitry, DRVCC and INTVCC –0.3 V to +6 V damage may occur on devices subjected to high energy ESD. VFB1 –0.3 V to +15 V Therefore, proper ESD precautions should be taken to avoid VFB2 –0.3 V to +6 V performance degradation or loss of functionality. PLLIN/SPREAD and FREQ –0.3 V to +6 V TRACK/SS1, TRACK/SS2, ITH1, and ITH2 –0.3 V to +6 V DRVSET and DRVUV –0.3 V to +6 V MODE, ILIM, and VPRG1 –0.3 V to +6 V PGOOD1 and PGOOD2 –0.3 V to +6 V DTCA and DTCB –0.3 V to +6 V SENSE1+, SENSE2+, SENSE1–, and SENSE2– –0.3 V to +65 V SENSE1+ to SENSE1– and SENSE2+ to SENSE2– Continuous –0.3 V to +0.3 V <1 ms –100 mA to +100 mA Operating Junction Temperature Range2 –40°C to +150°C Storage Temperature Range –65°C to +150°C 1 Do not apply a voltage or current source to these pins. They must be connect- ed to capacitive loads only. Otherwise, permanent damage can occur. 2 The LTC7890 is specified over the –40°C to 150°C operating junction temper- ature range. High junction temperatures degrade operating lifetimes. Note the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with the board layout, rated package thermal impedance, and other environmental factors. The junction temperature (TJ, in °C) is calculated from the ambient temperature (TA, in °C) and power dissipation (PD, in Watts) according to the following formula: TJ = TA + (PD × θJA), where θJA is the package thermal impedance and equals 34°C/W for the 40-lead (6 mm × 6 mm), side wettable, quad flat no lead (QFN) package.
analog.com Rev. 0 | 6 of 41
Document Outline Features Applications Typical Application Circuit General Description Specifications Electrical Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Functional Diagram Main Control Loop Power and Bias Supplies (VIN, EXTVCC, DRVCC, and INTVCC) High-Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Startup and Shutdown (RUNx and TRACK/SSx Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping Mode, or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Output Overvoltage Protection Foldback Current Power-Good Applications Information Inductor Value Calculation Inductor Core Selection Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Current Sensing Setting the Operating Frequency Selecting the Light Load Operating Mode Dead Time Control (DTCA and DTCB Pins) DTCx Pins Tied to GND (Adaptive Dead Time Control) DTCx Pins Tied to INTVCC (Smart Near Zero Dead Time Control) DTCx Pins Connected with a Resistor to GND Power FET Selection CIN and COUT Selection Setting the Output Voltage RUNx Pins and Undervoltage Lockout Soft Start and Tracking (TRACK/SSx Pin) 2-Phase Single Output Operation INTVCC Regulators (OPTI-DRIVE) Topside FET Driver Supply (CB) Minimum On-Time Considerations Fault Conditions: Current Limit and Foldback Fault Conditions: Overvoltage Protection Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Efficiency Considerations Checking Transient Response Design Example PCB Layout Checklist PCB Layout Debugging Typical Applications Related Products Outline Dimensions Ordering Guide Evaluation Boards