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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： | 4/24页 |
| 文件大小： | 272K |
| 代理商： | LTC4088EDE |
LTC4088
12
4088f
Ideal Diode from BAT to VOUT
The LTC4088 has an internal ideal diode as well as a
controller for an optional external ideal diode. Both the
internal and the external ideal diodes are always on and
will respond quickly whenever VOUT drops below BAT.
If the load current increases beyond the power allowed
from the switching regulator, additional power will be pulled
from the battery via the ideal diodes. Furthermore, if power
to VBUS (USB or wall power) is removed, then all of the
application power will be provided by the battery via the
ideal diodes. The ideal diodes will be fast enough to keep
VOUT from drooping with only the storage capacitance
required for the switching regulator. The internal ideal
diode consists of a precision amplier that activates a
large on-chip MOSFET transistor whenever the voltage at
VOUT is approximately 15mV (VFWD) below the voltage at
BAT. Within the amplier’s linear range, the small-signal
resistance of the ideal diode will be quite low, keeping
the forward drop near 15mV. At higher current levels, the
MOSFET will be in full conduction. The on-resistance in
this case is approximately 180m
Ω. If this is sufcient for
the application, then no external components are neces-
sary. However, if more conductance is needed, an external
P-channel MOSFET transistor can be added from BAT to
VOUT. The GATE pin of the LTC4088 drives the gate of the
P-channel MOSFET transistor for automatic ideal diode
control. The source of the external P-channel MOSFET
should be connected to VOUT and the drain should be
connected to BAT. Capable of driving a 1nF load, the GATE
pin can control an external P-channel MOSFET transistor
having an on-resistance of 30m
Ω or lower. When VBUS is
unavailable, the forward voltage of the ideal diode amplier
will be reduced from 15mV to nearly zero.
Suspend LDO
The LTC4088 provides a small amount of power to VOUTin
SUSPEND mode by including an LDO from VBUS to VOUT.
This LDO will prevent the battery from running down when
the portable product has access to a suspended USB port.
Regulating at 4.6V, this LDO only becomes active when
the switching converter is disabled. To remain compliant
with the USB specication, the input to the LDO is current
limited so that it will not exceed the low power or high
power suspend specication. If the load on VOUT exceeds
the suspend current limit, the additional current will come
from the battery via the ideal diodes. The suspend LDO
sends a scaled copy of the VBUS current to the CLPROG
pin, which will servo to approximately 100mV in this mode.
Thus, the high power and low power suspend settings are
related to the levels programmed by the same resistor for
1x and 5x modes.
3.3V Always-On Supply
The LTC4088 includes an ultralow quiescent current low
dropout regulator that is always powered. This LDO can be
used to provide power to a system pushbutton controller or
standby microcontroller. Designed to deliver up to 25mA,
the always-on LDO requires a 1F MLCC bypass capacitor
for compensation. The LDO is powered from VOUT, and
therefore will enter dropout at loads less than 25mA as
VOUT falls near 3.3V. If the LDO3V3 output is not used, it
should be disabled by connecting it to VOUT.
VBUS Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors VBUS and
keeps the switching regulator off until VBUS rises above the
rising UVLO threshold (4.3V). If VBUS falls below the falling
UVLO threshold (4V), system power at VOUT will be drawn
from the battery via the ideal diodes. The voltage at VBUS
must also be higher than the voltage at BAT by approxi-
mately 170mV for the switching regulator to operate.
OPERATIO
U
FORWARD VOLTAGE (mV) (BAT – VOUT)
0
CURRENT
(mA)
600
1800
2000
2200
120
240 300
4088 F03
200
1400
1000
400
1600
0
1200
800
60
180
360
480
420
VISHAY Si2333
OPTIONAL EXTERNAL
IDEAL DIODE
LTC4088
IDEAL DIODE
ON
SEMICONDUCTOR
MBRM120LT3
VBUS = 5V
Figure 3. Ideal Diode V-I Characteristics
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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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