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参数资料
| 型号： | LTC4160EUDC-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH POWER MANAGER 20-QFN |
| 标准包装： | 2,500 |
| 系列： | Bat-Track™, PowerPath™ |
| 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： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（3x4） |
| 包装： | 带卷 (TR) |
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LTC4160/LTC4160-1
OPERATION
(
)
I VBUS = I VBUSQ +
? h CLPROG + 1
theprogrammedlimit,CLPROGreaches1.18Vandpower
delivered by the switching regulator is held constant.
The input current limit is programmed by the I LIM0 and
I LIM1 pins. The input current limit has four possible set-
tings ranging from the USB suspend limit of 500μA up
to 1A for wall adapter applications. Two of these settings
are specifically intended for use in the 100mA and 500mA
USB application. Refer to Table 1 for current limit settings
using I LIM0 and I LIM1 .
Table 1. USB Current Limit Settings Using I LIM0 and I LIM1
I LIM1 I LIM0 USB SETTING
0 0 1x Mode (USB 100mA Limit)
0 1 10x Mode (Wall 1A Limit)
1 0 Low Power Suspend (USB 500μA Limit)
1 1 5x Mode (USB 500mA Limit)
When the switching regulator is activated, the average
input current will be limited by the CLPROG programming
resistor according to the following expression:
V CLPROG
R CLPROG
where I VBUSQ is the quiescent current of the LTC4160/
LTC4160-1, V CLPROG is the CLPROG servo voltage in
current limit, R CLPROG is the value of the programming
resistor and h CLPROG is the ratio of the measured cur-
rent at V BUS to the sample current delivered to CLPROG.
Refer to the Electrical Characteristics table for values of
h CLPROG , V CLPROG and I VBUSQ . Given worst-case circuit
tolerances, the USB specification for the average input
current in 100mA or 500mA mode will not be violated,
provided that R CLPROG is 3.01k or greater.
While not in current limit, the switching regulator’s
Bat-Track feature will set V OUT 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, V OUT
will regulate at a fixed 3.6V, as shown in Figure 2. This
instant-on operation 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 V BUS , V OUT will range between the no-load voltage and
slightly below the battery voltage, indicated by the shaded
region of Figure 2.
TO USB
OR WALL
ADAPTER
13
V BUS
14
SW
3.5V TO
(BAT + 0.3V)
TO SYSTEM LOAD
PWM AND
GATE DRIVE
I SWITCH /N
V BUS
VOLTAGE
CONTROLLER
5V
BATTERY CHARGER
1V
V OUT
12
CLPROG
17
AVERAGE V BUS INPUT
CURRENT LIMIT
CONTROLLER
V FLOAT
IDEAL
DIODE
OmV
15mV
+
–
10
IDGATE
1.18V
I BAT /1000
1
OVGATE
× 2
+
–
6V
3.6V
0.3V
+–
11
BAT
2
OVSENS
OVERVOLTAGE PROTECTION
V OUT VOLTAGE
CONTROLLER
PROG
8
+
SINGLE CELL
Li-Ion
USB INPUT
BATTERY POWER
41601 F01
Figure 1. Power Path Block Diagram – Power Available from USB/Wall Adapter
41601f
14
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