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参数资料
| 型号： | LTC3553EUD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封装： | 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 8/36页 |
| 文件大小： | 518K |
| 代理商： | LTC3553EUD#TRPBF |
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LTC3553
16
3553fa
MOSFET whenever the voltage at VOUT is approximately
15mV (VFWD) below the voltage at BAT. The resistance of
the internal ideal diode is approximately 240mΩ.
Suspend Mode
When the SUSP pin is pulled high the LTC3553 enters
suspend mode to comply with the USB specication. In
this mode, the power path between VBUS and VOUT is put
in a high impedance state to reduce the VBUS input current
to 15μA. The system load connected to VOUT is supplied
through the ideal diode connected to BAT.
VBUS Undervoltage Lockout (UVLO) and Undervoltage
Current Limit (UVCL)
An internal undervoltage lockout circuit monitors VBUS
and keeps the input current limit circuitry off until VBUS
rises above the rising UVLO threshold (3.8V) and at least
200mV above VBAT. Hysteresis on the UVLO turns off the
input current limit circuitry if VBUS drops below 3.6V or
within 50mV of VBAT. When this happens, system power at
VOUT will be drawn from the battery via the ideal diode. To
minimize the possibility of oscillation in and out of UVLO
when using resistive input supplies, the input current limit
is reduced as VBUS falls below 4.45V typical.
Battery Charger
The LTC3553 includes a constant-current/constant-volt-
age battery charger with automatic recharge, automatic
termination by safety timer, low voltage trickle charging,
bad cell detection and thermistor sensor input for out of
temperature charge pausing. When a battery charge cycle
begins, the battery charger rst determines if the battery
is deeply discharged. If the battery voltage is below VTRKL,
typically 2.9V, an automatic trickle charge feature sets the
battery charge current to 10% of the programmed value. If
the low voltage persists for more than 1/2 hour, the battery
charger automatically terminates. Once the battery voltage
is above 2.9V, the battery charger begins charging in full
power constant current mode. The current delivered to
the battery will try to reach 750V/RPROG. Depending on
available input power and external load conditions, the
battery charger may or may not be able to charge at the
full programmed current. The external load will always be
prioritized over the battery charge current. The USB cur-
rent limit programming will always be observed and only
additional current will be available to charge the battery.
When system loads are light, battery charge current will
be maximized.
Charge Termination
The battery charger has a built-in safety timer. When the
battery voltage approaches the oat voltage, the charge
current begins to decrease as the LTC3553 enters con-
stant-voltage mode. Once the battery charger detects that
it has entered constant-voltage mode, the four hour safety
timer is started. After the safety timer expires, charging
of the battery will terminate and no more current will be
delivered to the battery.
Automatic Recharge
After the battery charger terminates, it will remain off
drawing only microamperes of current from the battery.
If the portable product remains in this state long enough,
the battery will eventually self discharge. To ensure that
the battery is always topped off, a charge cycle will au-
tomatically begin when the battery voltage falls below
VRECHRG (typically 4.1V). In the event that the safety timer
is running when the battery voltage falls below VRECHRG,
the timer will reset back to zero. To prevent brief excur-
sions below VRECHRG from resetting the safety timer, the
battery voltage must be below VRECHRG for approximately
2ms. The charge cycle and safety timer will also restart
if the VBUS UVLO cycles low and then high (e.g., VBUS, is
removed and then replaced).
Charge Current
The charge current is programmed using a single resis-
tor from PROG to ground. 1/750th of the battery charge
current is delivered to PROG which will attempt to servo
to 1.000V. Thus, the battery charge current will try to
reach 750 times the current in the PROG pin. The program
resistor and the charge current are calculated using the
following equations:
R
PROG =
750V
I
CHG
,I
CHG =
750V
R
PROG
OPERATION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3554 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
| LTC3554EPD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
| LTC3554EPD#PBF | 功能描述:IC USB POWER MANAGER 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压: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:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3554EPD#TRPBF | 功能描述:IC USB POWER MANAGER 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| LTC3554EPDPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
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