LTC4124 Просмотр технического описания (PDF) - Analog Devices
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LTC4124 Datasheet PDF : 30 Pages
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LTC4124
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
CHRG Pull-Down Current vs
Temperature
400
VCHRG = 0.4V
300
360
340
320
300
280
260
240
220
200
–20 –5
10 25 40 55
TEMPERATURE (°C)
70 85
4124 G08
Charge Termination Period and
Bad Battery Detection Period vs
Temperature
3.8
61
VCC = 5V
3.6
57
3.4
53
3.2
49
3.0
45
2.8
41
2.6
37
2.4
CHARGE TERMINATION PERIOD 33
BAD BATTERY DETECTION PERIOD
2.2
29
–20 –5 10 25 40 55 70 85
TEMPERATURE (°C)
4124 G09
PIN FUNCTIONS
VCC (Pin 1): System DC Supply. The VCC voltage range
is 2.7V to 5.5V. An internal diode is connected from the
ACIN pin (anode) to this pin (cathode), and a second one
is connected from the DCIN pin (anode) to this pin (cath-
ode). The voltage on this pin will be determined by the
higher of the DCIN voltage and the peak AC voltage on the
ACIN pin. There is an internal 2.2µF rectification capacitor
connected between this pin and GND. Optional additional
capacitance can be connected externally between this pin
and GND.
CHRG (Pin 2): Charge Status Indicator. This pin is an open
drain output with a 300µA current source pull down. In
a typical application, this pin is pulled up by an LED to
VCC. This pin has four possible states shown in Table 1.
Table 1. CHRG States
CHRG
Status
High Impedance No Input Power
Blink Slow Powered On and Charging
(0.8Hz)
Blink Fast Charging Paused due to Battery Temperature Out of
(6Hz)
Range, or
Charging Stopped due to Bad Battery Detected, or
Limited Charging due to Undervoltage Current Limit
Pull Down End of Charge C/10 Reached or Charging Complete
PRECHG (Pin 3): Precharge Enable. Tie this pin to VCC to
enable low current precharge at battery voltages below
the precharge battery threshold (VBAT_TRKL). Tie this
pin to GND to disable low current precharge. When low
current precharge is disabled, full charge current will be
delivered for battery voltages below the final charge volt-
age. Do not leave this pin open.
VSEL1 (Pin 4): Charge Voltage Select Bit 1. Tie this pin
to VCC or GND to program the battery charge voltage. Do
not leave this pin open. Refer to Table 2 for programming
the desired charge voltage.
VSEL2 (Pin 5): Charge Voltage Select Bit 2. Tie this pin
to VCC or GND to program the battery charge voltage. Do
not leave this pin open. Refer to Table 2 for programming
the desired charge voltage.
Table 2. Battery Charge Voltage Programming
VSEL1
VSEL2
Charge Voltage
High
High
4.35V
High
Low
4.20V
Low
High
4.10V
Low
Low
4.00V
Rev. A
6
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