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参数资料
| 型号： | LTC3559EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC USB CHARGER 16-QFN |
| 标准包装： | 121 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC3559/LTC3559-1
OPERATION
The LTC3559/LTC3559-1 are linear battery chargers with
dual monolithic synchronous buck regulators. The buck
regulators are internally compensated and need no external
compensation components.
The battery charger employs a constant- current/constant-
voltage charging algorithm and is capable of charging a
single Li-Ion battery at charging currents up to 950mA. The
user can program the maximum charging current available
at the BAT pin via a single PROG resistor. The actual BAT
pin current is set by the status of the HPWR pin.
For proper operation, the BAT and PV IN pins must be tied
together. If a buck regulator is also enabled during the
battery charging operation, the net current charging the
battery may be lower than the actual programmed value.
Refer to Figure 1 for an explanation.
500mA
300mA
R PROG
1.62k
USB (5V)
V CC
PROG
LTC3559/
LTC3559-1
BAT
PV IN
200mA
+
+
2.2μF
SINGLE Li-lon
CELL 3.6V
SUSP
HIGH
HIGH
HIGH
LOW (PULSE SKIP MODE)
HPWR
EN1
EN2
MODE
SW1
SW2
V OUT1
V OUT2
3559 F01
Figure 1. Current Being Delivered at the BAT Pin Is 500mA. Both Buck Regulators Are Enabled. The Sum of the
Average Input Currents Drawn by Both Buck Regulators Is 200mA. This Makes the Effective Battery Charging Current
Only 300mA. If the HPWR Pin Were Tied LO, the BAT Pin Current Would Be 100mA. With the Buck Regulator
Conditions Unchanged, This Would Cause the Battery to Discharge at 100mA
APPLICATIONS INFORMATION
Battery Charger Introduction
The LTC3559/LTC3559-1 have a linear battery charger
designed to charge single-cell lithium-ion batteries. The
charger uses a constant-current/constant-voltage charge
algorithm with a charge current programmable up to
950mA. Additional features include automatic recharge,
an internal termination timer, low-battery trickle charge
conditioning, bad-battery detection, and a thermistor
sensor input for out of temperature charge pausing.
Furthermore, the battery charger is capable of operating
from a USB power source. In this application, charge
current can be programmed to a maximum of 100mA or
500mA per USB power speci?cations.
Input Current vs Charge Current
The battery charger regulates the total current delivered
to the BAT pin; this is the charge current. To calculate the
total input current (i.e., the total current drawn from the
V CC pin), it is necessary to sum the battery charge current,
charger quiescent current and PROG pin current.
Undervoltage Lockout (UVLO)
The undervoltage lockout circuit monitors the input volt-
age (V CC ) and disables the battery charger until V CC rises
above V UVLO (typically 4V). 200mV of hysteresis prevents
oscillations around the trip point. In addition, a differential
undervoltage lockout circuit disables the battery charger
when V CC falls to within V DUVLO (typically 50mV) of the
BAT voltage.
3559fb
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3559EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Linear USB Battery Charger with Dual Buck Regulators |
| LTC3560 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560E | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560ES6 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560ES6#PBF | 制造商:Linear Technology 功能描述:2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
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