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参数资料
| 型号： | LTC3552EDHC-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT LI-ION 16-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.25 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（5x3） |
| 包装： | 带卷 (TR) |
LTC3552-1
Standalone Linear Li-Ion
Battery Charger and Dual
Synchronous Buck Converter
FEATURES
DESCRIPTIO
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Programmable Charge Current Up to 950mA
Complete Linear Charger and Dual DC/DC
Regulator
Dual Fixed Outputs:
1.8V at 800mA
1.575V at 400mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
Charges Directly from a USB Port
Programmable Charge Current Termination
Preset 4.2V Charge Voltage with ±1% Accuracy
Charge Current Monitor Output for Gas Gauging*
Automatic Recharge
Charge Status Output
“Power Present” Output
Soft-Start Limits Inrush Current
Low Quiescent Current Buck Converter (40μA)
The LTC ? 3552-1 is a complete constant-current/constant-
voltage linear charger and dual ?xed output DC/DC con-
verter for single cell lithium-ion batteries. Its DFN package
and low external component count make the LTC3552-1
ideally suited for portable applications. Furthermore,
the LTC3552-1 is designed to work within USB power
speci?cations.
No external sense resistor or external blocking diode are
required due to the internal MOSFET architecture. The
charge voltage is ?xed at 4.2V and the charge current is
programmed with a resistor. The charge cycle terminates
when the charge current drops below the programmed
termination threshold after the ?nal ?oat voltage is
reached. When the input supply (wall adapter or USB
supply) is removed, the LTC3552-1 enters a low current
state dropping the battery drain current to less than 2μA.
Thermal regulation maximizes charge rate without risk
of overheating.
Current Mode Operation, Constant Frequency (2.25MHz)
Low Pro?le (5mm × 3mm × 0.75mm) DFN Package
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APPLICATIO S
The synchronous step-down switching regulators
generate ?xed output voltages of 1.8V and 1.575V.
The switching frequency is set at 2.25MHz, allowing the
use of small surface mount inductors and capacitors.
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Cellular Telephones, PDAs, MP3 Players
Bluetooth Applications
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6522118, 6700364, 5481178, 6580258, 6304066,
6127815, 6498466, 6611131.
TYPICAL APPLICATIO
Ef?ciency Curve/
Single Cell Li-Ion Battery Charger with
C/5 Termination and Dual DC/DC Converter
100
95
Power Loss of Regulators
V OUT2 = 1.575V
1000
CHRG
V CC
V IN
4.5V TO
6.5V
V OUT2
1.575V/
1 μ F
619 ?
1.24k
4.7 μ H
V IN RUN1
ITERM
RUN2
PROG
BAT
PWR
LTC3552-1
EN
SW2 SW1
800mA
+
10 μ F
2.2 μ H
4.2V
1-CELL
Li-Ion
BATTERY
V OUT1
1.8V/
90 V OUT1 = 1.8V
85
80
CHANNEL 1
75
70
CHANNEL 2
100
10
1
400mA
C OUT2
10 μ F
CER
C FF2
330pF
V OUT2
V FB2
GND
V OUT1
V FB1
C FF1
330pF
800mA
C OUT1
10 μ F
CER
65
60
1
V IN = 3.6V
Burst Mode OPERATION
10 100 1000
0.1
35521 TA01
LOAD CURRENT (mA)
35521 TAO1b
35521fa
1
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