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LTC1980EGN Datasheet

  • LTC1980EGN

  • Combination Battery Charger and DC/DC Converter

  • 16頁(yè)

  • LINER

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Final Electrical Specifications
LTC1980
Combination Battery
Charger and DC/DC Converter
May 2003
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
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
廬
Operation
and Shutdown for High Efficiency
High Efficiency Current Mode 300kHz PWM
Reduced Component Architecture
Undervoltage Protection and Soft-Start Insures
Start-Up with Current Limited Wall Adapter
Small 24-Pin SSOP Package
The LTC
廬
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 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.
APPLICATIO S
s
s
s
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
鈥?/div>
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擄C
FIGURE 5
10
100
LOAD CURRENT (mA)
1000
1980 G04
鈥?/div>
REG-FET
LDO/
SWITCH
SYSTEM LOAD
DC/DC
CONVERTERS
LTC1980
1980 TA01
3.3V
1.8V
1.5V
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
U
1980i
1

LTC1980EGN 產(chǎn)品屬性

  • LTC1980

  • 55

  • 集成電路 (IC)

  • PMIC - 電池管理

  • -

  • 充電管理

  • 鋰離子，鎳鎘，鎳氫

  • 2.85 V ~ 10 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 24-SSOP（0.154"，3.90mm 寬）

  • 24-SSOP

  • 管件

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