Datasheet LTC4007-1 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | 4A, High Efficiency, Li-Ion Battery Charger |
| Seiten / Seite | 24 / 6 — Typical perForMance characTerisTics. Efficiency at 19VDC VIN. Efficiency … |
| Dateiformat / Größe | PDF / 309 Kb |
| Dokumentensprache | Englisch |
Typical perForMance characTerisTics. Efficiency at 19VDC VIN. Efficiency at 12.6V with 15VDC VIN. pin FuncTions ACP (Pin 1):
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LTC4007-1
Typical perForMance characTerisTics Efficiency at 19VDC VIN Efficiency at 12.6V with 15VDC VIN
100 100 16.8V 95 95 12.6V 90 90 85 85 EFFICIENCY (%) EFFICIENCY (%) 80 80 75 75 0.50 1.00 1.50 2.00 2.50 3.00 0.50 1.00 1.50 2.00 2.50 3.00 CHARGE CURRENT (A) CHARGE CURRENT (A) 40071 G10 40071 G11
pin FuncTions ACP (Pin 1):
Open-Drain output to indicate if the AC adapter
3C4C (Pin 5):
Select 3-cell or 4-cell float voltage by con- voltage is adequate for charging. This pin is pulled low necting this pin to GND or open, respectively. Internal by an internal N-channel MOSFET if DCIN is below BAT. A 14µA pull-up to 5.3V. This pin can also be driven with pull-up resistor is required. The pin is capable of sinking open-collector/drain logic levels. High: 4 cell. Low: 3 cell. at least 100µA.
LOBAT (Pin 6):
Low-Battery Indicator. Active low digital
RT (Pin 2):
Timer Resistor. The timer period is set by placing output. Internal 10µA pull-up to 3.5V. If the battery volt- a resistor, RRT , to GND. This resistor is always required. age is below 3.25V/cell (or 3.173V/cell for 4.1V chemistry The timer period is t batteries) LOBAT will be low. The pin is capable of sink- TIMER = (1hour • RRT/154K). ing at least 100µA. If VLOGIC is greater than 3.3V, add an If this resistor is not present, the charger will not start. external pull-up.
FAULT (Pin 3):
Active low open-drain output that indicates
NTC (Pin 7):
A thermistor network is connected from NTC charger operation has stopped due to a low-battery condi- to GND. This pin determines if the battery temperature is tioning error, or that charger operation is suspended due to safe for charging. The charger and timer are suspended the thermistor exceeding allowed values. A pull-up resistor and the FAULT pin is driven low if the thermistor indicates is required if this function is used. The pin is capable of a temperature that is unsafe for charging. The thermistor sinking at least 100µA. function may be disabled with a 300k to 500k resistor
GND (Pin 4):
Ground for Low Power Circuitry. from DCIN to NTC.
ITH (Pin 8):
Control Signal of the Inner Loop of the Current Mode PWM. Higher ITH voltage corresponds to higher charging current in normal operation. A 6k resistor, in series with a capacitor of at least 0.1µF to GND provides loop compensation. Typical full-scale output current is 40µA. Nominal voltage range for this pin is 0V to 3V. 40071fa 6 For more information www.linear.com/LTC4007-1 Document Outline Description Typical Application Absolute Maximum Ratings Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Application Related Parts
Typical perForMance characTerisTics Efficiency at 19VDC VIN Efficiency at 12.6V with 15VDC VIN
100 100 16.8V 95 95 12.6V 90 90 85 85 EFFICIENCY (%) EFFICIENCY (%) 80 80 75 75 0.50 1.00 1.50 2.00 2.50 3.00 0.50 1.00 1.50 2.00 2.50 3.00 CHARGE CURRENT (A) CHARGE CURRENT (A) 40071 G10 40071 G11
pin FuncTions ACP (Pin 1):
Open-Drain output to indicate if the AC adapter
3C4C (Pin 5):
Select 3-cell or 4-cell float voltage by con- voltage is adequate for charging. This pin is pulled low necting this pin to GND or open, respectively. Internal by an internal N-channel MOSFET if DCIN is below BAT. A 14µA pull-up to 5.3V. This pin can also be driven with pull-up resistor is required. The pin is capable of sinking open-collector/drain logic levels. High: 4 cell. Low: 3 cell. at least 100µA.
LOBAT (Pin 6):
Low-Battery Indicator. Active low digital
RT (Pin 2):
Timer Resistor. The timer period is set by placing output. Internal 10µA pull-up to 3.5V. If the battery volt- a resistor, RRT , to GND. This resistor is always required. age is below 3.25V/cell (or 3.173V/cell for 4.1V chemistry The timer period is t batteries) LOBAT will be low. The pin is capable of sink- TIMER = (1hour • RRT/154K). ing at least 100µA. If VLOGIC is greater than 3.3V, add an If this resistor is not present, the charger will not start. external pull-up.
FAULT (Pin 3):
Active low open-drain output that indicates
NTC (Pin 7):
A thermistor network is connected from NTC charger operation has stopped due to a low-battery condi- to GND. This pin determines if the battery temperature is tioning error, or that charger operation is suspended due to safe for charging. The charger and timer are suspended the thermistor exceeding allowed values. A pull-up resistor and the FAULT pin is driven low if the thermistor indicates is required if this function is used. The pin is capable of a temperature that is unsafe for charging. The thermistor sinking at least 100µA. function may be disabled with a 300k to 500k resistor
GND (Pin 4):
Ground for Low Power Circuitry. from DCIN to NTC.
ITH (Pin 8):
Control Signal of the Inner Loop of the Current Mode PWM. Higher ITH voltage corresponds to higher charging current in normal operation. A 6k resistor, in series with a capacitor of at least 0.1µF to GND provides loop compensation. Typical full-scale output current is 40µA. Nominal voltage range for this pin is 0V to 3V. 40071fa 6 For more information www.linear.com/LTC4007-1 Document Outline Description Typical Application Absolute Maximum Ratings Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Application Related Parts