Datasheet LTC4000-1 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | High Voltage High Current Controller for Battery Charging with Maximum Power Point Control |
| Pages / Page | 40 / 10 — pin FuncTions (QFN/SSOP). CSN (Pin 19/Pin 15):. IID (Pin 23/Pin 19):. ITH … |
| File Format / Size | PDF / 495 Kb |
| Document Language | English |
pin FuncTions (QFN/SSOP). CSN (Pin 19/Pin 15):. IID (Pin 23/Pin 19):. ITH (Pin 24/Pin 20):. CSP (Pin 20/Pin 16):
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Text Version of Document
LTC4000-1
pin FuncTions (QFN/SSOP) CSN (Pin 19/Pin 15):
Charge Current Sense Negative Input (3V to 60V). To ensure that the input PMOS is turned off and Battery Ideal Diode Cathode. Connect a sense resistor when the IN pin voltage is not within its operating range, between this pin and the CSP pin. The LTC4000-1 senses connect a 10M resistor from this pin to the CSP pin. the voltage across this sense resistor and regulates it to a
IID (Pin 23/Pin 19):
Input Ideal Diode Anode. This pin is voltage equal to 1/20th (typical) of the voltage set at the the anode of the input ideal diode driver (the cathode is CL pin. The maximum regulated sense voltage is 50mV. the CSP pin). The CSN pin is also the cathode input of the battery ideal diode driver (the anode input is the BAT pin). Tie this pin
ITH (Pin 24/Pin 20):
High Impedance Control Voltage Pin. to the CSP pin if no charge current limit is desired. Refer to When any of the regulation loops (input voltage, charge the Applications Information section for complete details. current, battery float voltage or the output voltage) indicate that its limit is reached, the ITH pin will sink current (up to
CSP (Pin 20/Pin 16):
Charge Current Sense Positive Input 1mA) to regulate that particular loop at the limit. In many and Input Ideal Diode Cathode. Connect a sense resis- applications, this ITH pin is connected to the control/ tor between this pin and the CSN pin for charge current compensation node of a DC/DC converter. Without any sensing and regulation. This input should be tied to CSN external pull-up, the operating voltage range on this pin to disable the charge current regulation function. This is GND to 2.5V. With an external pull-up, the voltage on pin is also the cathode of the input ideal diode driver (the this pin can be pulled up to 6V. Note that the impedance anode is the IID pin). connected to this pin affects the overall loop gain. For
OFB (Pin 21/Pin 17):
Output Feedback Voltage Pin. This details, refer to the Applications Information section. pin is a high impedance input pin used to sense the output
CC (Pin 25/Pin 21):
Converter Compensation Pin. Connect voltage level. In regulation, the output voltage loop sets the an R-C network from this pin to the ITH pin to provide a voltage on this feedback pin to 1.193V. Connect this pin suitable loop compensation for the converter used. Refer to the center node of a resistor divider between the CSP to the Applications Information section for discussion and pin and the FBG pin to set the output voltage when battery procedure on choosing an appropriate R-C network for a charging is terminated and all the output load current is particular DC/DC converter. provided from the input. The output voltage can then be obtained as follows:
CLN (Pin 26/Pin 22):
Input Current Sense Negative Input. Connect a sense resistor between this pin and the IN pin. The VOUT = ROFB2 +ROFB1 • 1.193V LTC4000-1 senses the voltage across this sense resistor ROFB2 and sets the voltage on the IIMON pin equal to 20 times this voltage. Tie this pin to the IN pin if the input current When charging a heavily discharged battery (such that VOFB monitoring feature is not used. Refer to the Applications < VOUT(INST_ON)), the battery PowerPath PMOS connected Information section for complete details. to BGATE is regulated to set the voltage on this feedback pin to 0.974V (approximately 86% of the battery float
IN (Pin 27/Pin 23):
Input Supply Voltage: 3V to 60V. voltage). The instant-on output voltage is then as follows: Supplies power to the internal circuitry and the BIAS pin. Connect the power source to the downstream system and V the battery charger to this pin. This pin is also the positive OUT(INST _ ON) = ROFB2 + ROFB1 • 0.974V ROFB2 sense pin for the input current monitor. Connect a sense resistor between this pin and the CLN pin. Tie this pin to
IGATE (Pin 22/Pin 18):
Input PMOS Gate Drive Output. The CLN if the input current monitoring feature is not used. A IGATE pin drives the external PMOS to behave as an ideal local 0.1µF bypass capacitor to ground is recommended diode from the IID pin (anode) to the CSP pin (cathode) on this pin. when the voltage at the IN pin is within its operating range 40001fa 10 For more information www.linear.com/LTC4001-1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
pin FuncTions (QFN/SSOP) CSN (Pin 19/Pin 15):
Charge Current Sense Negative Input (3V to 60V). To ensure that the input PMOS is turned off and Battery Ideal Diode Cathode. Connect a sense resistor when the IN pin voltage is not within its operating range, between this pin and the CSP pin. The LTC4000-1 senses connect a 10M resistor from this pin to the CSP pin. the voltage across this sense resistor and regulates it to a
IID (Pin 23/Pin 19):
Input Ideal Diode Anode. This pin is voltage equal to 1/20th (typical) of the voltage set at the the anode of the input ideal diode driver (the cathode is CL pin. The maximum regulated sense voltage is 50mV. the CSP pin). The CSN pin is also the cathode input of the battery ideal diode driver (the anode input is the BAT pin). Tie this pin
ITH (Pin 24/Pin 20):
High Impedance Control Voltage Pin. to the CSP pin if no charge current limit is desired. Refer to When any of the regulation loops (input voltage, charge the Applications Information section for complete details. current, battery float voltage or the output voltage) indicate that its limit is reached, the ITH pin will sink current (up to
CSP (Pin 20/Pin 16):
Charge Current Sense Positive Input 1mA) to regulate that particular loop at the limit. In many and Input Ideal Diode Cathode. Connect a sense resis- applications, this ITH pin is connected to the control/ tor between this pin and the CSN pin for charge current compensation node of a DC/DC converter. Without any sensing and regulation. This input should be tied to CSN external pull-up, the operating voltage range on this pin to disable the charge current regulation function. This is GND to 2.5V. With an external pull-up, the voltage on pin is also the cathode of the input ideal diode driver (the this pin can be pulled up to 6V. Note that the impedance anode is the IID pin). connected to this pin affects the overall loop gain. For
OFB (Pin 21/Pin 17):
Output Feedback Voltage Pin. This details, refer to the Applications Information section. pin is a high impedance input pin used to sense the output
CC (Pin 25/Pin 21):
Converter Compensation Pin. Connect voltage level. In regulation, the output voltage loop sets the an R-C network from this pin to the ITH pin to provide a voltage on this feedback pin to 1.193V. Connect this pin suitable loop compensation for the converter used. Refer to the center node of a resistor divider between the CSP to the Applications Information section for discussion and pin and the FBG pin to set the output voltage when battery procedure on choosing an appropriate R-C network for a charging is terminated and all the output load current is particular DC/DC converter. provided from the input. The output voltage can then be obtained as follows:
CLN (Pin 26/Pin 22):
Input Current Sense Negative Input. Connect a sense resistor between this pin and the IN pin. The VOUT = ROFB2 +ROFB1 • 1.193V LTC4000-1 senses the voltage across this sense resistor ROFB2 and sets the voltage on the IIMON pin equal to 20 times this voltage. Tie this pin to the IN pin if the input current When charging a heavily discharged battery (such that VOFB monitoring feature is not used. Refer to the Applications < VOUT(INST_ON)), the battery PowerPath PMOS connected Information section for complete details. to BGATE is regulated to set the voltage on this feedback pin to 0.974V (approximately 86% of the battery float
IN (Pin 27/Pin 23):
Input Supply Voltage: 3V to 60V. voltage). The instant-on output voltage is then as follows: Supplies power to the internal circuitry and the BIAS pin. Connect the power source to the downstream system and V the battery charger to this pin. This pin is also the positive OUT(INST _ ON) = ROFB2 + ROFB1 • 0.974V ROFB2 sense pin for the input current monitor. Connect a sense resistor between this pin and the CLN pin. Tie this pin to
IGATE (Pin 22/Pin 18):
Input PMOS Gate Drive Output. The CLN if the input current monitoring feature is not used. A IGATE pin drives the external PMOS to behave as an ideal local 0.1µF bypass capacitor to ground is recommended diode from the IID pin (anode) to the CSP pin (cathode) on this pin. when the voltage at the IN pin is within its operating range 40001fa 10 For more information www.linear.com/LTC4001-1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
