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参数资料
| 型号： | LTC4088EDE |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, 2.7 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | 4 X 3 MM, 0.75 MM HEIGHT, PLASTIC, DFN-14 |
| 文件页数： | 3/24页 |
| 文件大小： | 272K |
| 代理商： | LTC4088EDE |
LTC4088
11
4088f
load current will be drawn from the battery via the ideal
diodes even when the battery charger is enabled.
The current at CLPROG is a precise fraction of the VBUS
current. When a programming resistor and an averaging
capacitor are connected from CLPROG to GND, the voltage
on CLPROG represents the average input current of the
switching regulator. As the input current approaches the
programmed limit, CLPROG reaches 1.188V and power
delivered by the switching regulator is held constant.
Several ratios of current are available which can be set
to correspond to USB low and high power modes with a
single programming resistor.
The input current limit is programmed by various com-
binations of the D0, D1 and D2 pins as shown in Table 1.
The switching input regulator can also be deactivated
(USB Suspend).
The average input current will be limited by the CLPROG pro-
gramming resistor according to the following expression:
II
V
R
h
VBUS
BUSQ
CLPROG
=+
+
()
1
where IBUSQ is the quiescent current of the LTC4088,
VCLPROG is the CLPROG servo voltage in current limit,
RCLPROG is the value of the programming resistor and
hCLPROG is the ratio of the measured current at VBUS to
the sample current delivered to CLPROG. Refer to the
Electrical Characteristics table for values of hCLPROG,
VCLPROG and IBUSQ. Given worst-case circuit tolerances,
the USB specication for the average input current of 1x
or 5x mode will not be violated, provided that RCLPROG is
2.94k or greater.
Table 1 shows the available settings for the D0, D1 and
D2 pins.
Notice that when D0 is high and D1 is low, the switching
regulator is set to a higher current limit for increased
charging and power availability at VOUT. These modes
will typically be used when there is line power available
from a wall adapter.
While not in current limit, the switching regulator’s Bat-
Track feature will set VOUT to approximately 300mV above
the voltage at BAT. However, if the voltage at BAT is below
3.3V, and the load requirement does not cause the switching
regulator to exceed its current limit, VOUT will regulate at a
xed 3.6V as shown in Figure 2. This will allow a portable
product to run immediately when power is applied without
waiting for the battery to charge.
If the load does exceed the current limit at VBUS, VOUT will
range between the no-load voltage and slighly below the
battery voltage, indicated by the shaded region of Figure 2.
If there is no battery present when this happens, VOUT may
collapse to ground.
The voltage regulation loop compensation is controlled by
the capacitance on VOUT. An MLCC capacitor of 10F is
required for loop stability. Additional capacitance beyond
this value will improve transient response.
OPERATIO
U
BAT (V)
2.4
4.5
4.2
3.9
3.6
3.3
3.0
2.7
2.4
3.3
3.9
4088 F02
2.7
3.0
3.6
4.2
V
OUT
(V)
NO LOAD
300mV
Figure 2. VOUT vs BAT
Table 1. Controlled Input Current Limit
D0
D1
D2
CHARGER
STATUS
IBUS(LIM)
0
On
100mA (1x)
0
1
Off
100mA (1x)
0
1
0
On
500mA (5x)
0
1
Off
500mA (5x)
1
0
On
1A (10x)
1
0
1
Off
1A (10x)
1
0
Off
500A (Susp Low)
1
Off
2.5mA (Susp High)
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相关代理商/技术参数 |
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| LTC4088EDE#PBF | 功能描述:IC CHRGR BATT HE 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4088EDE#TRPBF | 功能描述:IC BATT CHARGER/USB 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4088EDE-1#PBF | 功能描述:IC BATT CHARGER/USB 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4088EDE-1#TRPBF | 功能描述:IC BATT CHARGER/USB 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4088EDE-1-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage |
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