LT3652HVEDD-PBF LINER [Linear Technology], LT3652HVEDD-PBF Datasheet

LT3652HVEDD-PBF

Manufacturer Part Number

LT3652HVEDD-PBF

Description

Power Tracking 2A Battery Charger

Manufacturer

LINER [Linear Technology]

Datasheet

1.LT3652HVEDD-PBF.pdf (24 pages)

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APPLICATIONS

TYPICAL APPLICATION

FEATURES

24VDC AT 1A

AC ADAPTER

Drooping Lower Than 24V 5-Cell LiFePO

Input Supply Voltage Regulation Loop for Peak

Power Tracking in (MPPT) Solar Applications

Wide Input Voltage Range: 4.95V to 34V (40V Abs Max)

Programmable Charge Rate Up to 2A

User Selectable Termination: C/10 or On-Board

Termination Timer

Resistor Programmable Float Voltage Up to 18V

Accommodates 4-Cell Li-Ion/Polymer, 5-Cell

LiFePO

Parallelable for Higher Output Current

1MHz Fixed Frequency

0.5% Float Voltage Reference Accuracy

5% Charge Current Accuracy

2.5% C/10 Detection Accuracy

Binary-Coded Open-Collector Status Pins

Solar Powered Applications

Remote Monitoring Stations

Portable Handheld Instruments

12V to 24V Automotive Systems

Battery Charging from Current Limited Adapter

IN_REG

INPUT

Loop Servos Maximum Charge Current to Prevent AC Adapter Output from

, Lead-Acid Chemistries

750k

10μF

44.2k

MBRS340

51.1k

TIMER

SHDN

CHRG

FAULT

IN_REG

LT3652HV

Charger (18V at 1.5A) with C/10 Termination

BOOST

SENSE

3652 TA01a

BAT

NTC

1μF 10V

127k

10K

B = 3380

1N4148

150k

665k

DESCRIPTION

The LT

tery charger that operates over a 4.95V to 34V input range.

The LT3652HV provides a constant-current/constant-voltage

charge characteristic, with maximum charge current

externally programmable up to 2A. The charger employs

a 3.3V ﬂ oat voltage feedback reference, so any desired

battery ﬂ oat voltage up to 18V can be programmed with a

resistor divider.

The LT3652HV employs an input voltage regulation loop,

which reduces charge current if the input voltage falls below

a programmed level, set with a resistor divider. When the

LT3652HV is powered by a solar panel, the input regulation

loop is used to maintain the panel at peak output power.

The LT3652HV can be conﬁ gured to terminate charging when

charge current falls below 1/10 of the programmed maximum

(C/10). Once charging is terminated, the LT3652HV enters a

low-current (85μA) standby mode. An auto-recharge feature

starts a new charging cycle if the battery voltage falls 2.5%

below the programmed ﬂ oat voltage. The LT3652HV also

contains a programmable safety timer, used to terminate

charging after a desired time is reached. This allows top-off

charging at currents less than C/10.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

Power Tracking 2A Battery

10μF

20μH

5-Cell LiFePO

MBRS340

0.068

(18V FLOAT)

3652HV is a complete monolithic step-down bat-

PACK

SYSTEM

LOAD

1A/24VDC Unregulated Adapter

0 0.2

ADAPTER OUTPUT CURRENT (A)

I vs V Characteristic

0.4

0.6

LT3652HV

0.8

Charger

1.2

1.4

1.6

3652 TA01b

1.8

3652hvf

Related parts for LT3652HVEDD-PBF

LT3652HVEDD-PBF Summary of contents

Page 1

FEATURES n Input Supply Voltage Regulation Loop for Peak Power Tracking in (MPPT) Solar Applications n Wide Input Voltage Range: 4.95V to 34V (40V Abs Max) n Programmable Charge Rate User Selectable Termination: C/10 or On-Board ...

Page 2

... JMAX JA EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT3652HVEDD#PBF LT3652HVEDD#TRPBF LT3652HVIDD#PBF LT3652HVIDD#TRPBF LT3652HVEMSE#PBF LT3652HVEMSE#TRPBF 3652HV LT3652HVIMSE#PBF LT3652HVIMSE#TRPBF Consult LTC Marketing for parts speciﬁ ed with wider operating temperature ranges. *The temperature grade is identiﬁ label on the shipping container. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise speciﬁ cations are at T SYMBOL PARAMETER V V Operating Range Start Voltage IN V OVLO Threshold IN(OVLO) OVLO Hysteresis V UVLO Threshold IN(UVLO) UVLO Hysteresis V Float Voltage Reference FB(FLT) ΔV ...

Page 4

LT3652HV ELECTRICAL CHARACTERISTICS temperature range, otherwise speciﬁ cations are at T SYMBOL PARAMETER t Full Charge Cycle Timeout TIMER Precondition Timeout Timer Accuracy f Operating Frequency O DC Duty Cycle Range Note 1: Stresses beyond those listed under Absolute Maximum ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS V Threshold IN_REG vs Temperature 50% CHG 2.720 2.715 2.710 2.705 2.700 2.695 2.690 2.685 2.680 –50 – 100 TEMPERATURE (°C) 3652 G01 Switch Drive (I vs Switch Current 36 33 ...

Page 6

LT3652HV TYPICAL PERFORMANCE CHARACTERISTICS Maximum Charge Current (V – Temperature SENSE BAT 101 100.8 100.6 100.4 100.2 100.0 99.8 99.6 99.4 99.2 99.0 50 –50 – 100 TEMPERATURE (°C) 3652 G07 ...

Page 7

PIN FUNCTIONS V (Pin 1): Charger Input Supply 4.95V to 34V. V must be 3.3V greater than the pro- IN grammed output battery ﬂ oat voltage (V able start-up. (V – ≥ 0.75V is the ...

Page 8

LT3652HV PIN FUNCTIONS NTC (Pin 8): Battery Temperature Monitor Pin. This pin is the input to the NTC (Negative Temperature Coefﬁ cient) thermistor temperature monitoring circuit. This function is enabled by connecting a 10kΩ 3380 NTC thermistor from ...

Page 9

BLOCK DIAGRAM + 125°C – T DIE 0.2V TIMER – + TIMER OSC. RIPPLE COUNTER COUNT RESET COUNT RESET COUNT ENABLE MODE (TIMER OR C/10) CHRG CONTROL LOGIC TERMINATE FAULT STATUS C/10 PRECONDITION NTC + – – – ...

Page 10

LT3652HV APPLICATIONS INFORMATION Overview LT3652HV is a complete monolithic, mid-power, multi- chemistry buck battery charger, addressing high input voltage applications with solutions that require a minimum of external components. The IC uses a 1MHz constant fre- quency, average-current mode step-down ...

Page 11

APPLICATIONS INFORMATION stant-current (CC) mode, which corresponds to 100mV across R . The I voltage is pulled down to reduce SENSE TH this maximum charge current should the voltage on the V pin falls below 2.7V (V IN_REG IN_REG(TH) perature ...

Page 12

LT3652HV APPLICATIONS INFORMATION Bulk capacitance is a function of desired input ripple volt- age (ΔV ), and follows the relation • IN(BULK) CHG(MAX) BAT IN Input ripple voltages above 0.1V are not recommended. 10μF ...

Page 13

APPLICATIONS INFORMATION In low V applications, the BOOST supply can be powered external source for start-up, eliminating the V start-up requirement. V Output Decoupling BAT An LT3652HV charger output requires bypass capacitance connected from the BAT pin ...

Page 14

LT3652HV APPLICATIONS INFORMATION The minimum average diode current rating (I is calculated with maximum output current (I maximum operational V , and output at the precondition IN threshold ( 0.7 • V BAT(PRE) BAT(FLT) I > I • ...

Page 15

APPLICATIONS INFORMATION To satisfy the 250k equivalent resistance to the V pin 250k − 27.5k FB3 R = 223k. FB3 Because the V pin is a relatively high impedance node, FB stray capacitances at this pin must be ...

Page 16

LT3652HV APPLICATIONS INFORMATION power tracking (MPPT) application. As the temperature characteristic for a typical solar panel V linear, a simple solution for tracking that characteristic can be implemented using an LM234 3-terminal temperature sensor. This creates an easily programmable, linear ...

Page 17

APPLICATIONS INFORMATION and 25°C float voltage (V FLOAT(25°C) a convenient value of 2.4k for R SET values follow the relations –R • (TC • 4405) FB1 SET = –2.4k • (–0.0198 • 4405) = 210k ...

Page 18

LT3652HV APPLICATIONS INFORMATION of approximately 100mV appears at the charger output, due to cycling between termination and recharge events, This cycling results in pulsing at the CHRG output. An LED connected to this pin will exhibit a blinking pattern, indicating ...

Page 19

APPLICATIONS INFORMATION When the internal timer is used for termination, bad battery detection is engaged. There is no provision for bad battery detection if C/10 termination is used. A bad battery fault is triggered when the voltage on V precondition ...

Page 20

LT3652HV APPLICATIONS INFORMATION High current paths and transients should be kept iso- lated from battery ground, to assure an accurate output voltage reference. Effective grounding can be achieved by considering switched current in the ground plane, and careful component placement ...

Page 21

TYPICAL APPLICATIONS 2A Solar Panel Power Manager With 7.2V LiFePO and 17V Peak Power Tracking CMSH1-40MA SOLAR PANEL INPUT (<40V OC 10μF VOLTAGE) 530k V IN LT3652HV V IN_REG SHDN 100k CHRG FAULT TIMER Basic 2A 1-Cell LiFePO CMSH3-40MA V ...

Page 22

LT3652HV PACKAGE DESCRIPTION 3.50 ±0.05 2.10 ±0.05 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING IS NOT A ...

Page 23

PACKAGE DESCRIPTION 2.845 0.102 (.112 .004) 5.23 (.206) MIN 0.42 0.038 (.0165 .0015) TYP RECOMMENDED SOLDER PAD LAYOUT DETAIL “A” 0.254 (.010) GAUGE PLANE DETAIL “A” 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION ...

Page 24

LT3652HV TYPICAL APPLICATION 1A Solar Panel Powered 3-Stage 12V Lead-Acid Fast/Float Charger; 1A Charger Fast Charges with CC/CV Characteristics Up to 14.4V; When Charge Current Falls to 0.1A Charger Switches to 13.5V Float Charge Mode; Charger Re-Initiates 14.4V Fast Charge ...

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