Datasheet LTC3829 (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp |
| 页数 / 页 | 40 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. Shutdown Current. Quiescent Current … |
| 修订版 | E |
| 文件格式/大小 | PDF / 960 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Shutdown Current. Quiescent Current vs Temperature. vs Input Voltage
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LTC3829
TYPICAL PERFORMANCE CHARACTERISTICS Shutdown Current Quiescent Current vs Temperature vs Input Voltage Shutdown Current vs Temperature without EXTVCC
50 70 6 60 40 5 50 4 30 40 3 20 30 2 20 SHUTDOWN CURRENT (µA) 10 SHUTDOWN CURRENT (µA) QUIESCENT CURRENT (mA) 10 1 0 0 0 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3829 G20 3829 G21 3829 G22
PIN FUNCTIONS (UHF/FE) DIFFN (Pin 1/Pin 3):
Negative Input of Remote Sensing
TK/SS (Pin 9/Pin 11):
Output Voltage Tracking and Soft- Differential Amplifier. Connect this to the remote load Start Input. When one particular IC is configured to be the ground pin. master of two ICs, a capacitor to ground at this pin sets
DIFFP (Pin 2/Pin 4):
Positive Input of Remote Sensing the ramp rate for the master IC’s output voltage. When the Differential Amplifier. Must connect this to the remote load IC is configured to be the slave of two ICs, the VFB voltage positive terminal directly even when diffamp is not used. of the master IC is reproduced by a resistor divider and applied to this pin. An internal soft-start current of 1.25µA
RUN (Pin 3/Pin 5):
Run Control Input. A voltage above is charging this pin. 1.22V on this pin turns on the IC. There is a 1.0µA pull-up current for this pin. Once the RUN pin rises above 1.22V,
FREQ (Pin 10/Pin 12):
There is a precision 10µA current an additional 4.5µA pull-up current is added to the pin. sourced out of this pin. A resistor to ground sets a voltage which in turn programs the frequency. Alternatively, this
AVP (Pin 4/Pin 6):
Active Voltage Positioning Load Slope pin can be driven with a DC voltage to vary the frequency Programming Pin. A resistor tied between this pin and of the internal oscillator. the DIFFP pin sets the load slope. The AVP function can only be used with the remote sensing differential amplifier.
VFB (Pin 13/Pin 15):
Error Amplifier Feedback Input. This Float or connect a 1kΩ resistor to DIFFP pin when AVP pin receives the remotely sensed feedback voltage from function is not used. an external resistive divider.
SENSE1+, SENSE2+, SENSE3+ (Pins 5, 7, 11/Pins 7, 9, ITH (Pin 14/Pin 16):
Current Control Threshold and Error
13):
Current Sense Comparator Inputs. The (+) inputs to Amplifier Compensation Point. Each associated channels’ the current comparators are normally connected to DCR current comparator tripping threshold increases with this sensing networks or current sensing resistors. ITH control voltage.
SENSE1–, SENSE2–, SENSE3– (Pins 6, 8, 12/Pins 8, 10, 14):
Current Sense Comparator Inputs. The (–) inputs to the current comparators are connected to the output. Rev. E 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Shutdown Current Quiescent Current vs Temperature vs Input Voltage Shutdown Current vs Temperature without EXTVCC
50 70 6 60 40 5 50 4 30 40 3 20 30 2 20 SHUTDOWN CURRENT (µA) 10 SHUTDOWN CURRENT (µA) QUIESCENT CURRENT (mA) 10 1 0 0 0 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3829 G20 3829 G21 3829 G22
PIN FUNCTIONS (UHF/FE) DIFFN (Pin 1/Pin 3):
Negative Input of Remote Sensing
TK/SS (Pin 9/Pin 11):
Output Voltage Tracking and Soft- Differential Amplifier. Connect this to the remote load Start Input. When one particular IC is configured to be the ground pin. master of two ICs, a capacitor to ground at this pin sets
DIFFP (Pin 2/Pin 4):
Positive Input of Remote Sensing the ramp rate for the master IC’s output voltage. When the Differential Amplifier. Must connect this to the remote load IC is configured to be the slave of two ICs, the VFB voltage positive terminal directly even when diffamp is not used. of the master IC is reproduced by a resistor divider and applied to this pin. An internal soft-start current of 1.25µA
RUN (Pin 3/Pin 5):
Run Control Input. A voltage above is charging this pin. 1.22V on this pin turns on the IC. There is a 1.0µA pull-up current for this pin. Once the RUN pin rises above 1.22V,
FREQ (Pin 10/Pin 12):
There is a precision 10µA current an additional 4.5µA pull-up current is added to the pin. sourced out of this pin. A resistor to ground sets a voltage which in turn programs the frequency. Alternatively, this
AVP (Pin 4/Pin 6):
Active Voltage Positioning Load Slope pin can be driven with a DC voltage to vary the frequency Programming Pin. A resistor tied between this pin and of the internal oscillator. the DIFFP pin sets the load slope. The AVP function can only be used with the remote sensing differential amplifier.
VFB (Pin 13/Pin 15):
Error Amplifier Feedback Input. This Float or connect a 1kΩ resistor to DIFFP pin when AVP pin receives the remotely sensed feedback voltage from function is not used. an external resistive divider.
SENSE1+, SENSE2+, SENSE3+ (Pins 5, 7, 11/Pins 7, 9, ITH (Pin 14/Pin 16):
Current Control Threshold and Error
13):
Current Sense Comparator Inputs. The (+) inputs to Amplifier Compensation Point. Each associated channels’ the current comparators are normally connected to DCR current comparator tripping threshold increases with this sensing networks or current sensing resistors. ITH control voltage.
SENSE1–, SENSE2–, SENSE3– (Pins 6, 8, 12/Pins 8, 10, 14):
Current Sense Comparator Inputs. The (–) inputs to the current comparators are connected to the output. Rev. E 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts