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LTC1980EGN#TR

Description
Battery Management LTC1980 - Combination Battery Charger and DC/DC Converter
CategoryPower/power management    The power supply circuit   
File Size232KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC1980EGN#TR Overview

Battery Management LTC1980 - Combination Battery Charger and DC/DC Converter

LTC1980EGN#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instruction0.150 INCH, PLASTIC, SSOP-24
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesBATTERY CHARGE CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage10 V
Minimum input voltage2.85 V
Nominal input voltage5 V
JESD-30 codeR-PDSO-G24
JESD-609 codee0
length8.649 mm
Humidity sensitivity level1
Number of functions1
Number of terminals24
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.727 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency340 kHz
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.899 mm
LTC1980
Combination Battery
Charger and DC/DC Converter
FEATURES
DESCRIPTIO
Single Controller IC Includes Battery Charger
Plus DC/DC Converter
Wall Adapter Voltage May be Above or Below
Battery Voltage
LDO Controller Allows Simultaneous Charging
and Regulating from Wall Adapter Input
Standalone Li-Ion Battery Charger Including Charge
Termination, Overvoltage Protection, Shorted-Cell
Detection and Battery Recharge
Selectable 4.1V, 4.2V, 8.2V and 8.4V Float Voltages
Simple NiMH and NiCd Battery Charger
Pin Programmable Regulator Burst Mode
®
Operation
and Shutdown for High Efficiency
High Efficiency Current Mode 300kHz PWM
Reduced Component Architecture
Undervoltage Protection and Soft-Start Ensures
Start-Up with Current Limited Wall Adapter
Small 24-Pin SSOP Package
The LTC
®
1980 integrates PWM power control for charg-
ing a battery and converting the battery voltage to a
regulated output or simultaneously charging the battery
while powering a system load from an unregulated AC wall
adapter. Combining these features into a single IC pro-
duces a smaller area and lower cost solution compared to
presently available multi-IC solutions. The LTC1980 shares
the discrete components for both the battery charger and
the DC/DC converter thus minimizing size and cost relative
to dual controller solutions. Both the battery charger and
DC/DC converter use a current mode flyback topology for
high efficiency and excellent transient response. Optional
Burst Mode operation and power-down mode allow power
density, efficiency and output ripple to be tailored to the
application.
The LTC1980 provides a complete Li-Ion battery charger
with charge termination timer, preset Li-Ion battery volt-
ages, overvoltage and undervoltage protection, and user-
programmable constant-current charging. Automatic bat-
tery recharging, shorted-cell detection, and open-drain
C/10 and wall plug detect outputs are also provided. User
programming allows NiMH and NiCd battery chemistries
to be charged as well.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
Patents Pending.
APPLICATIO S
Digital Cameras
Handheld Computers
Personal Digital Assistants
1W to 10W Uninterruptable Power Supplies
TYPICAL APPLICATIO
POWER FLOW
CHARGING
BATTERY
OPERATION
Li-Ion
BATTERY
Li-Ion Charger and DC/DC Converter Using One IC
3.3V Regulator Efficiency vs Load Current
90
SYSTEM
POWER
BAT-FET
UNREGULATED
WALL ADAPTER
INPUT (3V TO 10V)
85
EFFICIENCY (%)
80
75
70
65
60
V
BAT
= 3.6V
T
A
= 25°C
FIGURE 5
10
100
LOAD CURRENT (mA)
1000
1980 G04
REG-FET
LDO/
SWITCH
SYSTEM LOAD
DC/DC
CONVERTERS
LTC1980
1980 TA01
3.3V
1.8V
1.5V
U
1980f
U
U
1
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