ltm8062 Linear Technology Corporation, ltm8062 Datasheet
ltm8062
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ltm8062 Summary of contents
Page 1
... SLA 4 a programmed level, set with a resistor divider. When the LTM8062 is powered by a solar panel, this input regulation loop is used to maintain the panel at peak output power. The LTM8062 also features preconditioning trickle charge, bad battery detection, a choice of termination schemes and automatic restart ...
Page 2
... JMAX θ JCtop θ VALUES DETERMINED PER JEDEC 51-9, 51-12 PART MARKING* PACKAGE DESCRIPTION 77-Lead (15mm × 9mm × 4.32mm) LGA LTM8062V 77-Lead (15mm × 9mm × 4.32mm) LGA LTM8062V http://www.linear.com/leadfree/ http://www.linear.com/packaging/ TOP VIEW FAULT CHRG GND BIAS ADJ RUN V ...
Page 3
... Specifications over the full –40°C to 125°C internal operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM8062I is guaranteed to meet specifications over the full –40°C to The l denotes the specifications which apply over the full internal = 25° ...
Page 4
... LTM8062 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency 4.2V Float BAT 12V INA 24V INA 500 1000 1500 I (mA) BAT 8062 G01 Efficiency 14.4V Float BAT 24V INA 500 1000 1500 2000 I (mA) BAT ...
Page 5
... V (V) INA Maximum Charge Current vs Temperature 2000 1600 1200 800 400 0 –40 – 3.5 TEMPERATURE (°C) LTM8062 T = 25°C, unless otherwise noted. A Input Current 8.4V Float BAT 1600 1400 V = 12V INA 1200 1000 800 600 V INA 400 200 0 2000 ...
Page 6
... LTM8062 TYPICAL PERFORMANCE CHARACTERISTICS Temperature Rise vs I 7.2V Float Voltage 24V INA 500 1000 I (mA) BAT Temperature Rise vs I 14.4V Float Voltage INA 500 1000 I (mA) BAT PIN FUNCTIONS GND (Bank 1, Pin L7): Power and Signal Ground Return. ...
Page 7
... BAT(FLT) 2.7V. Connecting a resistor divider from V minimum operational V program the peak power voltage for a solar panel. The LTM8062 servos the maximum charge current required to maintain the programmed operational V voltage on V feature is not used, connect the pin to V BAT(FLT) RUN (Pin K6): Precision Threshold Enable Input Pin ...
Page 8
... ADJ pin), the μModule automati- cally increases the maximum charge current to the full programmed value. The LTM8062 can use a charge current based C/10 termina- tion scheme, which ends a charge cycle when the battery charge current falls to one-tenth the programmed charge current ...
Page 9
... Once charging terminates and the LTM8062 is not actively charging, the charger automatically enters a low current standby mode in which supply bias currents are reduced to 85μ ...
Page 10
... X7R 50V * Input bulk capacitance is required. V Input Supply IN The LTM8062 is biased directly from the charger input sup- ply through the V pin. This pin provides large switched IN currents high quality low ESR decoupling capacitor is recommended to minimize voltage glitches typically adequate for most charger applications. ...
Page 11
... Case 2: the battery ESR is very small or very large; the LTM8062 controller is designed for a wide range, but some battery packs have an ESR outside of this range. Case 3: there is no battery at all. As the charger is designed to work with the ESR of the battery, the output may oscillate if no battery is present ...
Page 12
... For example, manufacturers of large lead-acid batteries recommend a float charge of 2.25V/cell at 25°C. This battery float voltage, however, has a temperature coefficient which is typically specified at –3.3mV/°C per cell. BAT R FB1 LTM8062 R 210k R SET R FB3 2.4k 215k ...
Page 13
... Bad-Battery Fault (Precondition Timeout/EOC Failure) Low High Normal Charging at C/10 or Greater Low Low NTC Fault (Pause) If the battery is removed from an LTM8062 charger that is configured for C/10 termination, a low amplitude sawtooth waveform appears at the charger output, due to cycling between termination and recharge events. This cycling + 6-CELL LEAD-ACID ...
Page 14
... The FAULT pin is pulled low to signal that a fault has been detected. Cycling the charger’s power or shutdown function initiates a new charge cycle, but the LTM8062 charger does not require a manual reset. Once a bad-battery fault is detected new timer charge cycle initiates if the BAT pin exceeds the precondition threshold voltage. During a bad-battery fault, a small current is sourced from the charger ...
Page 15
... V pin of the LTM8062 can ring to more than twice the IN nominal input voltage, possibly exceeding the LTM8062’s rating and damage the part. If the input supply is poorly ...
Page 16
... LTM8062. The bulk of the heat flow out of the LTM8062 is through the bottom of the module and the LGA pads into the printed circuit board. Consequently a poor printed circuit board design can cause excessive heating, result- ing in impaired performance or reliability ...
Page 17
... GND 8062 TA02 LTM8062 V BAT INA V BIAS IN CHRG V INREG 642k FAULT RUN TMR ADJ NTC 412k GND LTM8062 CASE (TOP)-TO-AMBIENT RESISTANCE AMBIENT BOARD-TO-AMBIENT RESISTANCE 80421 F08 + (OPTIONAL ELECTROLYTIC 2-CELL CAPACITOR) LiFePO 4 (2× 3.6V) BATTERY 2-CELL Li-ION + (OPTIONAL (2× 4.2V) ...
Page 18
... LTM8062 PACKAGE DESCRIPTION bbb // 3.810 2.540 1.5875 1.270 0.9525 0.000 1.270 2.540 3.4925 3.810 4.1275 8062f ...
Page 19
... GND J2 GND GND J3 GND GND J4 GND K4 V INA GND J5 GND K5 V INA NTC J6 TMR K6 RUN FAULT CHRG ADJ J7 K7 LTM8062 PIN NAME PIN NAME E1 GND F1 GND E2 GND F2 GND E3 GND F3 GND E4 GND F4 GND E5 GND F5 GND E6 BAT F6 BAT E7 BAT F7 BAT PIN ...
Page 20
... LTM8022 1A, 36V DC/DC μModule Regulator LTM8023 2A, 36V DC/DC μModule Regulator LTM8025 3A, 36V DC/DC μModule Regulator LTM8021 500mA, 36V DC/DC μModule Regulator Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● LTM8062 V BAT INA V BIAS IN CHRG V INREG 642k 2-CELL FAULT RUN Li-Ion (2 4 ...