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参数资料
| 型号： | MAX17085GTL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/38页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER/CTLR/LDO REG 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 4.5 V ~ 24 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 托盘 |
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Integrated Charger, Dual Main Step-Down
Controllers, and Dual LDO Regulators
V REF
I INPUT LOAD + CHG BATT
= I
Digital ISET
If there are two clock edges on ISET within 20ms, the
PWM filter is enabled and ISET accepts digital PWM
input. The PWM filter accepts the digital signal with a
frequency from 128Hz to 500kHz. Zero duty cycle shuts
down the MAX17085B, and the 99% duty cycle cor-
responds to full scale (100mV) across CSIP and CSIN.
The PWM filter has a DAC with 8-bit resolution that corre-
sponds to equivalent V CSIP - V CSIN steps. Each step is:
= =
V STEP = 0.391mV (7.8mA with RS2 20m ? )
256 ? 21
Choose a current-sense resistor (RS2) to have a suf-
ficient power dissipation rating to handle the full-charge
current. The current-sense voltage may be reduced to
minimize the power dissipation period. However, this
may degrade accuracy due to the current-sense ampli-
fier’s input offset (200μV). See the Typical Operating
Characteristics to estimate the charge-current accuracy
at various set points.
Input Source Current
Setting Input Current Limit
The total input current, from a wall adapter or other DC
source, is the sum of the system supply current and
the current required by the charger. When the input
current exceeds the set input current limit, the control-
ler decreases the charge current to provide priority to
system load current. System current normally fluctuates
as portions of the system are powered up or down. The
input-current-limit circuit reduces the power requirement
of the AC wall adapter, which reduces adapter cost. As
the system supply rises, the available charge current
drops linearly to zero. Thereafter, the total input current
can increase without limit. The total input current can be
estimated as follows:
I × V
V ADP × η
where E is the efficiency of the DC-to-DC converter (typi-
cally 85% to 95%).
In the MAX17085B, the voltage across CSSP and CSSN
is constant at 60mV. Choose the current-sense resistor,
RS1, to set the input current limit. For example, for 4A
input current limit choose RS1 = 15m I . For the input
current-limit settings, which cannot be achievable with
standard sense resistor values, use a resistive voltage-
divider between CSSP and CSSN to tune the setting.
AC Adapter Overcurrent (ACOC)
When the input current is 1.3 times the input current-limit
setting, PDSL is pulled to GND after a 16ms blanking
time. This turns off the adapter switch and enables the
battery selector switch. After 0.6s, PDSL is reenabled. If
the fault condition persists, the cycle is repeated, until
the third time when the charger is latched off. To clear
the fault latch, remove the adapter and allow DCIN to fall
below its UVLO threshold before reinserting the adapter.
Analog Input Current-Monitor Output
IINP monitors the system-input current, which is sensed
across CSSP and CSSN. The voltage at IINP is propor-
tional to the input current:
V IINP = G IINP × I ADP × RS1
=
V IINP 60 × ( V CSSP - V CSSN )
where I ADP is the DC current supplied by the AC adapt-
er, G IINP is the transconductance of the sense amplifier
(60V/V typ), and RS1 is the resistor connected between
CSSP and CSSN.
When the adapter is absent, drive ISET above 2.1V to
enable IINP during battery discharge.
AC Adapter Detection
(ACIN, ACOK , ACOV)
The ACIN input goes to two internal comparators, one
for adapter detection ( ACOK ) and another for adapter
overvoltage detection (ACOV). When ACIN is above
1.5V, the open-drain ACOK output becomes low imped-
ance after 44ms.
When ACIN rises above 2.1V, the MAX17085B detects
an ACOV condition and immediately pulls PDSL to GND,
turning off the adapter selection switch and enabling the
battery selector switch. This protects the system rail from
excessively high voltages that might violate the absolute
maximum ratings of the downstream components. Note
that ACOK remains low even when ACIN is above the
ACOV threshold.
Use a resistive voltage-divider from the adapter’s output
to the ACIN pin to set the appropriate detection thresh-
old. Connect a 100k I pullup resistor between LDO3 or
LDO5 and ACOK .
Automatic Power-Source Selection (PDSL)
The MAX17085B integrates a charge pump to drive the
gate of n-channel adapter selector switches (N3 and
Q1a) and the p-channel battery-selector switch (Q1b).
When the adapter is present, PDSL is driven 8V above
V DCIN so that N3 and Q1a are on, and Q1b is off. See
the Operating Conditions section for the definition of
adapter present.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17085GTL+ | 功能描述:电池管理 Dual Main Step-Down Controller RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17086GTL+ | 功能描述:电池管理 Dual Main Step-Down Controller RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17088ETX+ | 功能描述:显示驱动器和控制器 Boost & Level Shift for Notebook RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17088ETX+T | 功能描述:显示驱动器和控制器 Boost & Level Shift for Notebook RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17088EVKIT+ | 功能描述:电源管理IC开发工具 MAX17088 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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