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参数资料
| 型号： | LTC4088EDE-1#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封装： | 4 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WGED-3, DFN-14 |
| 文件页数： | 4/24页 |
| 文件大小： | 906K |
| 代理商： | LTC4088EDE-1#TR |
LTC4088-1
40881fa
Ideal Diode from BAT to VOUT
The LTC4088-1 has an internal ideal diode as well as a
controller for an 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
fromtheswitchingregulator,additionalpowerwillbepulled
fromthebatteryviatheidealdiodes.Furthermore,ifpower
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 amplifier that activates a
large on-chip MOSFET transistor whenever the voltage at
VOUT is approximately 15mV (VFWD) below the voltage at
BAT. Within the amplifier’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. An external P-channel
MOSFETtransistorshouldbeaddedfromBATtoVOUT.The
GATE pin of the LTC4088-1 drives the gate of the external
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,theforwardvoltageoftheidealdiodeamplifier
will be reduced from 15mV to nearly zero.
Suspend LDO
The LTC4088-1 provides a small amount of power to VOUT
inSUSPENDmodebyincludinganLDOfromVBUStoVOUT.
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 specification, the input to the LDO is current
limited so that it will not exceed the low power or high
power suspend specification. 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,whichwillservotoapproximately100mVinthismode.
Thus, the high power and low power suspend settings are
related to the levels programmed by the same resistor for
1x and 5x modes.
VBUS Undervoltage Lockout (UVLO)
AninternalundervoltagelockoutcircuitmonitorsVBUSand
keepstheswitchingregulatoroffuntilVBUSrisesabovethe
risingUVLOthreshold(4.3V).IfVBUSfallsbelowthefalling
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-
mately170mVfortheswitchingregulatortooperate.
Battery Charger
TheLTC4088-1includesaconstant-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.
OPERATIO
U
FORWARD VOLTAGE (mV) (BAT – VOUT)
0
cURRENT
(mA)
600
1800
2000
2200
120
240 300
40881 F03
200
1400
1000
400
1600
0
1200
800
60
180
360
480
420
VISHAY Si2333
EXTERNAL
IDEAL DIODE
LTc4088-1
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 |
参数描述 |
|---|---|
| LTC4088EDE-1-TRPBF | 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 |
| LTC4088EDE-2#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:- 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-2#TRPBF | 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:- 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-2-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 |
| LTC4088EDE-2-TRPBF | 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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