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LTC4095EDC Datasheet(PDF) 7 Page - Linear Technology |
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LTC4095EDC Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page LTC4095 7 4095fa SIMPLIFIED BLOCK DIAGRAM – + 6 + – RECHRG CHRGR ON TEMP FAULT TERMINATE CHARGE BAD BAT TRICKLE 2.9V M1 BAT 4.105V NTC 3 CHRG NTC TRICKLE CHARGE TEMP FAULT CONTROL LOGIC BLINK LOGIC COUNTER 2.25MHz CLOCK CONSTANT CURRENT/ CONSTANT VOLTAGE CHARGE CURRENT CONTROL RECHARGE – + C/10 100mV PROG IBAT ENABLE IBAT 800 TREF HPWR TDIE 5 IN THERMAL AMP BAT BAT IN 4V 8 1 – + SUSP 4095 F01 4 7 GND 2 IN DUVLO UVLO Figure 1. LTC4095 Block Diagram OPERATION Introduction The LTC4095 is a linear battery charger designed to charge single-cell lithium-ion batteries. The charger uses a constant-current/constant-voltage charge algorithm with a charge current programmable up to 950mA. Ad- ditional features include automatic recharge, an internal termination timer, low-battery trickle charge conditioning, bad-battery detection, and a thermistor sensor input for out of temperature charge pausing. Futhermore, the LTC4095 is capable of operating from a USB power source. In this application, charge current can be programmed to a maximum of 100mA or 500mA per USB power specifications. Input Current vs Charge Current The LTC4095 regulates the total current delivered to the BAT pin; this is the charge current. To calculate the total input current (i.e., the total current drawn from the IN pin), it is necessary to sum the battery charge current, charger quiescent current and PROG pin current. Undervoltage Lockout (UVLO) The undervoltage lockout circuit monitors the input volt- age (IN) and disables the battery charger until IN rises above VUVLO (typically 4V). 200mV of hysteresis prevents oscillations around the trip point. In addition, a differential undervoltage lockout circuit disables the battery charger when IN falls to within VDUVLO (typically 40mV) of the BAT voltage. Suspend Mode The LTC4095 can also be disabled by pulling the SUSP pin above 1.2V. In suspend mode, the battery drain cur- rent is reduced to 1.3µA and the input current is reduced to 8.5µA. |
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