LTC4069EDC-4.4-PBF LINER [Linear Technology], LTC4069EDC-4.4-PBF Datasheet

LTC4069EDC-4.4-PBF

Manufacturer Part Number

LTC4069EDC-4.4-PBF

Description

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC4069EDC-4.4-PBF.pdf (16 pages)

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APPLICATIONS

TYPICAL APPLICATION

FEATURES

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6522118, 6700364.

Wireless PDAs

Cellular Phones

Portable Electronics

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

Complete Linear Charger in 2mm × 2mm DFN

Package

C/10 Charge Current Detection Output

Timer Charge Termination

Charge Current Programmable Up to 750mA with

5% Accuracy

No External MOSFET, Sense Resistor or Blocking

Diode Required

NTC Thermistor Input for Temperature Qualiﬁ ed

Charging

Preset 4.4V Float Voltage with 0.6% Accuracy

Constant-Current/Constant-Voltage Operation with

Thermal Feedback to Maximize Charge Rate

Without Risk of Overheating

Charge Current Monitor Output for Gas Gauging

Automatic Recharge

Charges Single-Cell Li-Ion Batteries Directly from

USB Port

20μA Supply Current in Shutdown Mode

Soft-Start Limits Inrush Current

Tiny 6-Lead (2mm × 2mm) DFN Package

4.5V TO 5.5V

*E.G. SANYO BATTERIES: UF553436T OR UF553450T

Standalone Li-Ion Battery Charger

100k

NOM

100k

NTC

1μF

510Ω

CHRG

NTC

LTC4069-4.4

PROG

GND

BAT

500mA

PROG

4069 TA01

4.4V

Li-Ion

BATTERY*

Battery Charger in 2 × 2 DFN

DESCRIPTION

The LTC

constant-voltage linear charger for high capacity single-cell

lithium-ion batteries with a 4.4V ﬂ oat voltage. The 2mm

× 2mm DFN package and low external component count

make the LTC4069-4.4 especially well-suited for portable

applications. Furthermore, LTC4069-4.4 is speciﬁ cally

designed to work within USB power speciﬁ cations.

The CHRG pin indicates when charge current has dropped

to ten percent of its programmed value (C/10). An

internal timer terminates charging according to battery

manufacturer speciﬁ cations.

No external sense resistor or blocking diode is required due to

the internal MOSFET architecture. Thermal feedback regulates

charge current to limit the die temperature during high power

operation or high ambient temperature conditions.

When the input supply (wall adapter or USB supply) is

removed, the LTC4069-4.4 automatically enters a low current

state, dropping battery drain current to less than 1μA. With

power applied, LTC4069-4.4 can be put into shutdown mode,

reducing the supply current to less than 20μA.

The LTC4069-4.4 also includes automatic recharge, low-

battery charge conditioning (trickle charging), soft-start

(to limit inrush current) and an NTC thermistor input used

to monitor battery temperature.

The LTC4069-4.4 is available in a tiny 6-lead, low proﬁ le

(0.75mm) 2mm × 2mm DFN package.

with NTC Thermistor Input

Standalone 750mA Li-Ion

Complete Charge Cycle (1100mAh Battery)

4069-4.4 is a complete constant-current/

250

200

550

500

450

400

350

300

150

100

CONSTANT-CURRENT

CONSTANT-

VOLTAGE

0.5

PROG

= 5V

1.5

= 2K

TIME (HOURS)

2.5

CHRG

TRANSITION

3.5

CHARGE

TERMINATION

LTC4069-4.4

4.5

4.4

4.3

4.2

4.1

4.0

3.9

3.8

3.7

3.6

3.5

3.4

4069 TA01b

406944fa

Related parts for LTC4069EDC-4.4-PBF

LTC4069EDC-4.4-PBF Summary of contents

Page 1

FEATURES n Complete Linear Charger in 2mm × 2mm DFN Package n C/10 Charge Current Detection Output n Timer Charge Termination n Charge Current Programmable Up to 750mA with 5% Accuracy n No External MOSFET, Sense Resistor or Blocking Diode ...

Page 2

... LEAD FREE FINISH TAPE AND REEL LTC4069EDC-4.4#PBF LTC4069EDC-4.4#TRPBF Consult LTC Marketing for parts speciﬁ ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based ﬁ nish parts. For more information on lead free part marking, go to: For more information on tape and reel speciﬁ ...

Page 3

ELECTRICAL CHARACTERISTICS l The denotes speciﬁ cations which apply over the full operating temperature range, otherwise speciﬁ cations are 5V 3.8V unless otherwise speciﬁ ed. (Note 2) CC BAT NTC SYMBOL PARAMETER ...

Page 4

LTC4069-4.4 TYPICAL PERFORMANCE CHARACTERISTICS Battery Regulation (Float) Voltage vs Charge Current 4. 25° PROG 4.42 4.40 4.38 4.36 0 100 200 400 300 I (mA) BAT 4069 G01 Charge Current ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Undervoltage Lockout Threshold Voltage vs Temperature 4.00 3.75 RISE 3.50 3.25 FALL 3.00 2.75 2.50 – –25 TEMPERATURE (°C) 4069 G16 CHRG Pin Output Low Voltage vs Temperature 140 ...

Page 6

LTC4069-4.4 PIN FUNCTIONS GND (Pin 1): Ground. CHRG (Pin 2): Open-Drain Charge Status Output. The charge status indicator pin has three states: pull-down, pulse at 2Hz and high impedance state. This output can be used as a logic interface or ...

Page 7

SIMPLIFIED BLOCK DIAGRAM – TOO COLD NOM + NTC 5 C2 TOO – HOT R NTC R9 + NTC_EN C3 – R10 PROG 0.1V + – C/10 CHRG 2 2.9V OPERATION ...

Page 8

LTC4069-4.4 OPERATION temperatures for a given application with the assurance that the charger will automatically reduce the current in worst-case conditions. The charge cycle begins when the voltage at the V rises above 3.5V and approximately 80mV above the BAT ...

Page 9

OPERATION battery voltage does not exceed the recharge threshold voltage when the timer ends, the timer resets and a 2.25 hour recharge cycle begins. The CHRG output assumes a strong pull-down state during recharge cycles until C/10 is reached when ...

Page 10

LTC4069-4.4 OPERATION POWER ON TRICKLE CHARGE MODE 1/10 FULL CHARGE CURRENT CHRG STRONG PULL-DOWN 1/4 CHARGE CYCLE (1.125 HOURS) DEFECTIVE BATTERY IS V < 2.9V? BAT BAD BATTERY MODE NO CHARGE CURRENT CHRG PULSES (2Hz) V < straight ...

Page 11

OPERATION APPLICATIONS INFORMATION Undervoltage Charge Current Limiting (UVCL) The LTC4069-4.4 includes undervoltage charge (ΔV current limiting that prevents full charge current until the input supply voltage exceeds approximately 220mV above the battery voltage. This feature is particularly useful if the ...

Page 12

LTC4069-4.4 APPLICATIONS INFORMATION a programmed current higher than 600mA. Since the LTC4069-4.4 will demand a charge current higher than the current limit of the input supply, the supply voltage will drop to the battery voltage plus 600mA times the on- ...

Page 13

APPLICATIONS INFORMATION Power Dissipation The conditions that cause the LTC4069-4.4 to reduce charge current through thermal feedback can be approximated by considering the power dissipated in the IC. For high charge currents, the LTC4069-4.4 power dissipation is approximately ...

Page 14

LTC4069-4.4 APPLICATIONS INFORMATION NOM 8.87k – 0.76 • NTC + 6 R1 604Ω – R NTC 10k + 0.35 • – 0.016 • Figure 6. NTC Circuits Thermistors The LTC4069-4.4 ...

Page 15

• 816 0 − COLD HOT NOM 3 266 0 5325 . . 3 266 0 5325 . − the ...

Page 16

LTC4069-4.4 RELATED PARTS PART NUMBER DESCRIPTION Battery Chargers LTC1734 Lithium-Ion Linear Battery Charger in ThinSOT LTC1734L Lithium-Ion Linear Battery Charger in ThinSOT LTC4002 Switch Mode Lithium-Ion Battery Charger LTC4050 Lithium-Ion Linear Battery Charger Controller LTC4052 Monolithic Lithium-Ion Battery Pulse Charger ...

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