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參數(shù)資料
| 型號： | MAX1873 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Simple Current-Limited Switch-Mode Li Charger Controller |
| 中文描述： | 簡單的限流型開關(guān)模式Li+充電控制器 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 206K |
| 代理商： | MAX1873 |
where C
OUT
is the total output capacitance, V
REF
is the
reference voltage (4.2V), V
BATT
is the maximum battery
regulation voltage (typically 4.2V per cell), V
DCIN (MIN)
is the minimum source-input voltage, and R
CSB
is the
current-sense resistor (68m
for 3A charging current)
from CSB to BATT.
The maximum output capacitor ESR allowed for stability is:
where R
ESR
is the output capacitor ESR.
Compensation Components
The three regulation loops: input current limit, charging
current limit, and charging voltage limit are compensat-
ed separately using the CCS, CCI, and CCV pins,
respectively.
The charge-current loop error-amplifier output is
brought out at CCI. Likewise, the source-current error-
amplifier output is brought out at CCS. 47nF capacitors
to ground at CCI and CCS compensate the current
loops in most charger designs. Raising the value of
these capacitors reduces the bandwidth of these loops.
The voltage-regulating loop error-amplifier output is
brought out at CCV. Compensate this loop by connect-
ing a capacitor in parallel with a series resistor-capaci-
tor from CCV to GND. Recommended values are shown
in Figure 1.
Applications Information
VL, VH, and REF Bypassing
The MAX1873 uses two internal linear regulators to
power internal circuitry. The outputs of the linear regu-
lators are at VL and VH. VL powers the internal control
circuitry while VH powers the MOSFET gate driver. VL
may also power a limited amount of external circuitry,
as long as its maximum current (3mA) is not exceeded.
A 2.2μF bypass capacitor is required from VL to GND
to ensure stability. A 0.22μF capacitor is required from
VH to DCIN. A 1μF bypass capacitor is required
between REF and GND to ensure that the internal 4.2V
reference is stable. In all cases, use low-ESR ceramic
capacitors.
Charging NiMH and NiCd Cells
The MAX1873 may be used in multichemistry chargers.
When charging NiMH or NiCd cells, pull CCV high (to
VL) with a 1.5 k
resistor. This disables the voltage
control loop so the Li+ battery-regulation voltage set-
tings do not interfere with charging. However, the bat-
tery undervoltage-protection features remain active so
charging current is reduced when V
BATT
is less than
the levels stated in the BATT Undervoltage Threshold
line in the
Electrical Characteristics Table.
5- or 6-series
Ni cells may be charged with the R version device, 7-
to 9-cells with the S version, and 10-cells with the T ver-
sion.
The MAX1873 contains no charge-termination algo-
rithms for Ni cells; it acts only as a current source. A
separate microcontroller or Ni-cell charge controller
must instruct the MAX1873 to terminate charging.
Chip Information
PROCESS: BiCMOS
TRANSISTOR COUNT: 1397
R
R
V
V
ESR
CSB
BATT
REF
<
×
M
Simple Current-Limited Switch-Mode
Li+ Charger Controller
______________________________________________________________________________________
13
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
CSSN
VL
DCIN
EXT
VH
GND
CSB
BATT
REF
TOP VIEW
MAX1873R/S/T
16 QSOP
CSSP
CCS
ICHG/EN
CCV
CCI
IOUT
VADJ
Pin Configuration
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1873SEEE | Simple Current-Limited Switch-Mode Li Charger Controller |
| MAX1873REEE | Simple Current-Limited Switch-Mode Li Charger Controller |
| MAX1873TEEE | Simple Current-Limited Switch-Mode Li Charger Controller |
| MAX1874 | MAX1874 Evaluation Kit |
| MAX1874ETE | Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1873EVKIT | 功能描述:電池管理 Evaluation Kit for the MAX1873 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1873REEE | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1873REEE+ | 功能描述:電池管理 Switch-Mode Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1873REEE+T | 功能描述:電池管理 Switch-Mode Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1873REEE-T | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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