Datasheet LTC3866 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | Current Mode Synchronous Controller for Sub Milliohm DCR Sensing |
| Pages / Page | 36 / 8 — Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 538 Kb |
| Document Language | English |
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Input Quiescent Current
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LTC3866
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Input Quiescent Current Quiescent Current vs Temperature Shutdown Current vs Temperature vs Input Voltage without EXTVCC without EXTVCC
50 4.00 4.0 45 3.8 3.75 40 3.6 3.50 35 3.4 30 3.25 3.2 25 3.0 3.00 SHUTDOWN CURRENT (µA) 20 QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) 2.8 2.75 15 2.6 10 2.50 2.4 –50 –25 0 25 50 75 100 125 150 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) 3866 G22 3866 G23 3866 G24
pin FuncTions (FE/UF) FREQ (Pin 1/Pin 22):
Oscillator Frequency Control Input.
DIFFN (Pin 7/Pin 4):
Negative Input of Remote Sensing A 10µA current source flows out of this pin. Connecting Differential Amplifier. Connect this pin close to the ground a resistor between this pin and ground sets a DC voltage of the output load. which in turn programs the oscillator frequency. Alterna-
DIFFP (Pin 8/Pin 5):
Positive Input of Remote Sensing tively, this pin can be driven with a DC voltage to vary the Differential Amplifier. Connect this pin close to the output frequency of the internal oscillator. load.
RUN (Pin 2/Pin 23):
Run Control Input. A voltage above
SNSD+ (Pin 9/Pin 6):
First Positive Current Sense Input. 1.22V turns on the IC. Pulling this pin below 1.14V causes This pin is connected to sense the signal of the output the IC to shut down. There is a 1μA pull-up current for the inductor’s DCR, it is to be used with a filter that matches pin. Once the RUN pin rises above 1.22V, an additional the bandwidth, L/DCR, of the inductor. 4.5μA pull-up current is added to the pin.
SNS– (Pin 10/Pin 7):
Negative Current Sense Input. This
TK/SS (Pin 3/Pin 24):
Output Voltage Tracking and Soft- negative input of the current comparator is to be connected Start Input. An internal soft-start current of 1.25μA charges to the output. the external soft-start capacitor connected to this pin.
SNSA+ (Pin 11/Pin 8):
Second Positive Current Sense
ITH (Pin 4/Pin 1):
Current Control Threshold and Error Input. This input is to be connected to sense the signal of Amplifier Compensation Pin. The current comparator trip- the output’s inductor DCR with a filter bandwidth of five ping threshold is proportional with this voltage. times larger than L/DCR.
VFB (Pin 5/Pin 2):
Error Amplifier Feedback Input. This
ILIM (Pin 12/Pin 9):
Current Comparator Sense Voltage pin receives the remotely sensed feedback voltage to set Limit. Apply a DC voltage to set the maximum current the output voltage through an external resistive divider sense threshold for the current comparator. connected to the DIFFOUT pin or the output.
CLKOUT (Pin 13/Pin 10):
Clock Output Pin. The CLKOUT
DIFFOUT (Pin 6/Pin 3):
Output of Remote Sensing Differ- signal is 180° out of phase to the rising edge of the IC ential Amplifier. Connect this pin to VFB through a resistive internal clock. divider to set the desired output voltage. 3866fc 8 For more information www.linear.com/LTC3866 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Input Quiescent Current Quiescent Current vs Temperature Shutdown Current vs Temperature vs Input Voltage without EXTVCC without EXTVCC
50 4.00 4.0 45 3.8 3.75 40 3.6 3.50 35 3.4 30 3.25 3.2 25 3.0 3.00 SHUTDOWN CURRENT (µA) 20 QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) 2.8 2.75 15 2.6 10 2.50 2.4 –50 –25 0 25 50 75 100 125 150 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) 3866 G22 3866 G23 3866 G24
pin FuncTions (FE/UF) FREQ (Pin 1/Pin 22):
Oscillator Frequency Control Input.
DIFFN (Pin 7/Pin 4):
Negative Input of Remote Sensing A 10µA current source flows out of this pin. Connecting Differential Amplifier. Connect this pin close to the ground a resistor between this pin and ground sets a DC voltage of the output load. which in turn programs the oscillator frequency. Alterna-
DIFFP (Pin 8/Pin 5):
Positive Input of Remote Sensing tively, this pin can be driven with a DC voltage to vary the Differential Amplifier. Connect this pin close to the output frequency of the internal oscillator. load.
RUN (Pin 2/Pin 23):
Run Control Input. A voltage above
SNSD+ (Pin 9/Pin 6):
First Positive Current Sense Input. 1.22V turns on the IC. Pulling this pin below 1.14V causes This pin is connected to sense the signal of the output the IC to shut down. There is a 1μA pull-up current for the inductor’s DCR, it is to be used with a filter that matches pin. Once the RUN pin rises above 1.22V, an additional the bandwidth, L/DCR, of the inductor. 4.5μA pull-up current is added to the pin.
SNS– (Pin 10/Pin 7):
Negative Current Sense Input. This
TK/SS (Pin 3/Pin 24):
Output Voltage Tracking and Soft- negative input of the current comparator is to be connected Start Input. An internal soft-start current of 1.25μA charges to the output. the external soft-start capacitor connected to this pin.
SNSA+ (Pin 11/Pin 8):
Second Positive Current Sense
ITH (Pin 4/Pin 1):
Current Control Threshold and Error Input. This input is to be connected to sense the signal of Amplifier Compensation Pin. The current comparator trip- the output’s inductor DCR with a filter bandwidth of five ping threshold is proportional with this voltage. times larger than L/DCR.
VFB (Pin 5/Pin 2):
Error Amplifier Feedback Input. This
ILIM (Pin 12/Pin 9):
Current Comparator Sense Voltage pin receives the remotely sensed feedback voltage to set Limit. Apply a DC voltage to set the maximum current the output voltage through an external resistive divider sense threshold for the current comparator. connected to the DIFFOUT pin or the output.
CLKOUT (Pin 13/Pin 10):
Clock Output Pin. The CLKOUT
DIFFOUT (Pin 6/Pin 3):
Output of Remote Sensing Differ- signal is 180° out of phase to the rising edge of the IC ential Amplifier. Connect this pin to VFB through a resistive internal clock. divider to set the desired output voltage. 3866fc 8 For more information www.linear.com/LTC3866 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
