DC1645A-D Linear Technology, DC1645A-D Datasheet

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DC1645A-D

Manufacturer Part Number
DC1645A-D
Description
BOARD EVAL LTM8061-8.4
Manufacturer
Linear Technology
Series
LTM®, uModule®r
Datasheets

Specifications of DC1645A-D

Main Purpose
Power Management, Battery Charger
Embedded
No
Utilized Ic / Part
LTM8061
Primary Attributes
2 Cell- Li-Ion, 8.2V 2A Output
Secondary Attributes
LED Status Indicators
Lead Free Status / RoHS Status
Not applicable / Not applicable
FEATURES
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
APPLICATIONS
n
n
n
L, LT, LTC, LTM, Linear Technology, Linear logo, μModule and PolyPhase are registered
trademarks and PowerPath is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners
6V TO 32V
Wide Input Voltage Range: 4.95V to 32V
(40V Absolute Maximum)
Float Voltage Options:
1-Cell: 4.1V, 4.2V
2-Cell: 8.2V, 8.4V
Programmable Charge Current: Up to 2A
User-Selectable Charge Termination: C/10 or
Onboard Termination Timer
Dynamic Charge Rate Programming/Soft-Start Pin
Programmable Input Current Limit
Optional Reverse Input Protection
NTC Resistor Temperature Monitor
0.5% Float Voltage Accuracy
Bad-Battery Detection with Auto-Reset
Tiny, Low Profi le (9mm × 15mm × 4.32mm) Surface
Mount LGA Package
Industrial Handheld Instruments
12V to 24V Automotive and Heavy Equipment
Professional Video/Camera Chargers
V
IN
Standalone Single Cell 2A Li-Ion Battery Charger
4.7μF
with C/10 Termination from 6V to 32V Input
V
V
V
RUN
RNG/SS
TMR
NTC
INA
INC
IN
/CLP
LTM8061-4.1
GND
FAULT
CHRG
8061 TA01a
BIAS
BAT
+
AVAILABLE OPTIONS:
1-CELL: 4.1V, 4.2V
2-CELL: 8.2V, 8.4V
SINGLE
CELL
4.1V
BATTERY
DESCRIPTION
The LTM
standalone Li-Ion battery charger. It is optimized for one
and two-cell packs, with fi xed fl oat voltage options: 4.1V,
4.2V, 8.2V and 8.4V. The LTM8061 provides a constant-
current/constant-voltage charge characteristic, with
maximum charge current up to 2A. A precondition feature
trickle charges a depleted battery, and bad battery detec-
tion provides a signal and suspends charging if a battery
does not respond to preconditioning.
The LTM8061 can be confi gured to terminate charging
when charge current falls to one-tenth the programmed
maximum current or to use an internal timer if a time-
based termination scheme is desired. Once charging is
terminated, the LTM8061 enters a low current standby
mode. An auto-restart feature starts a new charge cycle if
the battery voltage drops 2.5% from the fl oat voltage, or
if a new battery is inserted into a charging system.
The LTM8061 is packaged in a thermally enhanced, com-
pact (9mm × 15mm × 4.32mm) over-molded land grid
array (LGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8061 is
RoHS compliant.
Polymer Battery Charger
32V, 2A µModule Li-Ion/
®
2500
2000
1500
1000
500
8061 is a high effi ciency 32V, 2A μModule
0
0
PRECONDITION
Battery Charging Profi le
1
BATTERY VOLTAGE (V)
TERMINATION
2
NORMAL CHARGING
3
8061 TA01b
LTM8061
4
1
8061f
®

Related parts for DC1645A-D

DC1645A-D Summary of contents

Page 1

... Automotive and Heavy Equipment n Professional Video/Camera Chargers L, LT, LTC, LTM, Linear Technology, Linear logo, μModule and PolyPhase are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners TYPICAL APPLICATION Standalone Single Cell 2A Li-Ion Battery Charger with C/10 Termination from 6V to 32V Input LTM8061-4 ...

Page 2

LTM8061 ABSOLUTE MAXIMUM RATINGS (Note ....................................................40V INA INC/CLP IN RUN, CHRG, FAULT ...................................V TMR, RNG/SS, NTC .................................................2.5V BIAS, BAT .................................................................10V Internal Operating Temperature (Note 2) ................................................................. 125°C Maximum Body Solder Temperature ..................... 245°C ORDER ...

Page 3

ELECTRICAL CHARACTERISTICS operating temperature range, otherwise specifi cations are at T PARAMETER V Operating Voltage IN V Start Voltage IN V OVLO Threshold IN OVLO Hysteresis UVLO Threshold IN V UVLO Hysteresis /CLP ...

Page 4

LTM8061 ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTM8061E ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Input Current 8.2V BAT BAT 1600 1400 1200 V = 12V INA 1000 800 600 400 V = 24V INA 200 0 0 500 1500 1000 I (mA) BAT 8061 G07 ...

Page 6

LTM8061 TYPICAL PERFORMANCE CHARACTERISTICS Input Standby Current vs Temperature, 4.2V BAT 12V INA 24V INA –50 0 100 50 TEMPERATURE (°C) 8061 G16 Temperature Rise ...

Page 7

PIN FUNCTIONS GND (Bank 1): Power and Signal Ground Return. BAT (Bank 2): Battery Charge Current Output Bus. The charge function operates to achieve the final float voltage at this pin. The auto-restart feature initiates a new charge cycle when ...

Page 8

LTM8061 PIN FUNCTIONS RNG/SS (Pin H7): Charge Current Programming/Soft- Start Pin. This pin allows the maximum charge current to be reduced from the default 2A level, and can be used to employ a soft-start function. This pin has an effective ...

Page 9

BLOCK DIAGRAM V V /CLP INA INC 0.1μF 0.1μF INTERNAL COMPENSATION RUN RNG/SS TMR NTC V IN CURRENT MODE BATTERY MANAGEMENT CONTROLLER FAULT CHRG GND LTM8061 SENSE BAT 8.2μH RESISTOR 10μF BIAS 8061 BD 8061f 9 ...

Page 10

LTM8061 APPLICATIONS INFORMATION Overview The LTM8061 is a complete monolithic, mid-power, Li-Ion battery charger, addressing high input voltage applications with solutions that use a minimum of external components. The product is available in four variants: 4.1V, 4.2V, 8.2V and 8.4V ...

Page 11

APPLICATIONS INFORMATION BATTERY VOLTAGE BATTERY CHARGE CURRENT CHRG FAULT RUN Figure 1. Typical C/10 Terminated Charge Cycle (TMR Grounded, Time Not to Scale) BATTERY VOLTAGE BATTERY CHARGE CURRENT CHRG FAULT RUN Figure 2. Typical EOC (Timer-Based) Terminated Charge Cycle (Capacitor ...

Page 12

... ESR of the battery, the output may oscillate if no battery is present. 12 The optimum ESR is about 100mΩ, but ESR values both higher and lower will work. Table 1 shows a sample of parts verifi Linear Technology: Table 1. Recommended BAT Capacitors . A PART NUMBER IN ...

Page 13

APPLICATIONS INFORMATION A 1.5A system limit, for example, would use a 33mΩ sense resistor. Figure 4 gives an example of the system current for the situation where the input current happens to be 1A, and then gets reduced as the ...

Page 14

LTM8061 APPLICATIONS INFORMATION RNG/SS: Soft-Start Soft-start functionality is also supported by the RNG/SS pin. 50μA is sourced from the RNG/SS pin, so connect- ing a capacitor from the RNG/SS pin to ground (C in Figure 7) creates a linear voltage ...

Page 15

APPLICATIONS INFORMATION Termination at the end of the timer cycle only occurs if the charge cycle was successful. A successful charge cycle occurs when the battery is charged to within 2.5% of the full-charge float voltage charge cycle ...

Page 16

LTM8061 APPLICATIONS INFORMATION PCB Layout Most of the headaches associated with PCB layout have been alleviated or even eliminated by the high level of LTM8061 integration. The LTM8061 is nevertheless a switching power supply, and care must be taken to ...

Page 17

APPLICATIONS INFORMATION of the LTM8061 can ring to more than twice the nominal input voltage, possibly exceeding the LTM8061’s rating and damaging the part. If the input supply is poorly con- trolled or the user will be plugging the LTM8061 ...

Page 18

LTM8061 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 8061f ...

Page 19

... PACKAGE PHOTOGRAPH Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. Table 3. Pin Assignment Table ...

Page 20

... LGA OUT ≤ 5V, 6.25mm × 6.25mm × 2.32mm LGA OUT ≤ 5V, 9mm × 11.25mm × 2.82mm LGA, OUT ≤ 5V, 9mm × 11.25mm × 2.82mm LGA, OUT LT 0910 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2010 8061f ...

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