DC1568A Linear Technology, DC1568A Datasheet

DC1568A

Manufacturer Part Number

DC1568A

Description

BOARD BATTERY CHARGER SOLAR PWR

Manufacturer

Linear Technology

Datasheet

1.DC1568A.pdf (6 pages)

Specifications of DC1568A

Main Purpose

Power Management, Battery Charger

Embedded

Utilized Ic / Part

LT3652

Primary Attributes

Multi-Chemistry, Solar Power

Secondary Attributes

LED Status Indicators

Silicon Manufacturer

Linear Technology

Silicon Core Number

LTC3652

Kit Application Type

Power Management - Battery

Application Sub Type

Battery Charger

Development Tool Type

Hardware - Eval/Demo Board

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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DESCRIPTION

Demonstration Circuit 1568A is a 2A Monolithic

Multi-Chemistry battery charger for solar power

applications featuring the LT3652EDD. The

LT3652 is a complete mid-power Li-Ion battery

charger that can operate over a wide input volt-

age range. The charger employs a 3.3V float

voltage feedback reference that allows the bat-

tery float voltage to be adjusted up to 14.4V.

R10 and R11, in the demonstration circuit, set

the float voltage and are 0603 resistors to ac-

commodate the use of 0.1% resistors if desired.

The circuit is constructed with 1% resistors

which could introduce as much as a 1.56% error

in the float voltage. Replacing these resistors

with 0.1% resistors would introduce less than a

0.154% error. The LT3652 has an input voltage

regulation loop which reduces charge current if

Table 1: Typical Specifications (25°C)

HV Input Voltage Range

VOUT

Output Float Voltage (constant voltage mode)

Output Current Limit ILIM

OPERATING PRINCIPLE

LT3652 is a complete monolithic mid-power Li-Ion bat-

tery charger, addressing high input voltage applications

with solutions that require a minimum of external com-

ponents. The IC uses a 1MHz constant frequency, aver-

age-current mode step-down architecture.

The LT3652 incorporates a 2A switch that is driven by a

bootstrapped supply to maximize efficiency during

11.5V to 32V

8.04V to 8.36V

8.2V

the input falls below a programmed level, set

with a resistor divider. The charger is a CC/CV

charger with a maximum charge current of 2A. A

precondition feature trickle charges a low-

voltage battery, and bad battery detection pro-

vides a signal if the battery doesn’t respond to

preconditioning.

The LT3652EDD is available in a 12-lead (3mm

× 3mm) DFN surface mount package with an

exposed pad.

Design files for this circuit board are available. Call

the LTC factory.

trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy

Drive, FilterCAD, Hot Swap, LinearView, μModule, Micropower SwitcherCAD, Multimode

Dimming, No Latency ΔΣ, No Latency Delta-Sigma, No R

PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT,

UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names

may be trademarks of the companies that manufacture the products.

charging cycles. A wide input range allows operation to

fully charge from 11.5V (single cell) to 32V. A precision-

threshold shutdown pin allows the incorporation of

UVLO functionality using a simple resistor divider. The

IC can also be put into a low-current shutdown mode, in

which the input supply bias is reduced to only 15uA.

The LT3652 incorporates several degrees of charge cur-

rent control freedom. The overall maximum charge cur-

Chemistry Battery Charger

, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered

DEMO CIRCUIT 1568A

2A Monolithic Multi-

QUICK START GUIDE

SENSE

LT3652EDD

, Operational Filter, PanelProtect,

Related parts for DC1568A

DC1568A Summary of contents

Page 1

... Drive, FilterCAD, Hot Swap, LinearView, μModule, Micropower SwitcherCAD, Multimode Dimming, No Latency ΔΣ, No Latency Delta-Sigma PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT, UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names may be trademarks of the companies that manufacture the products. 11.5V to 32V 8 ...

Page 2

LT3652EDD rent is set using an external inductor current sense resis- tor. A maximum charge current programming pin allows dynamic manipulation of the battery charge current. The LT3650 also incorporates a system input-supply current limit control feature that servos the ...

Page 3

Increase PS2 until VBAT is 8.5V. Verify the battery charging current, IBAT, is less than 5mA and that the CHRG LED is off. 6. Decrease PS2 until VBAT is 7.8V. Verify the bat- tery current, IBAT, is between 1.775A ...

Page 4

... LT3652EDD Note: All connections from equipment should be Kelvin connected directly to the Board PINS which they are connected to on this diagram and any input, or output, leads should be twisted pair. Figure 1. Proper Measurement Equipment Setup for DC1568A 4 ...

Page 5

Figure 2: Schematic diagram LT3652EDD 5 ...

Page 6

LT3652EDD 6 Bill of Materials ...

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