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參數(shù)資料
| 型號： | MAX745EAP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Switch-Mode Lithium-Ion Battery-Charger |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO20 |
| 封裝： | SSOP-20 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 91K |
| 代理商： | MAX745EAP |
_______________Detailed Desc ription
The MAX745 is a switch-mode, lithium-ion battery
charger that can achieve 90% efficiency. The charge
voltage and current are set independently by external
resistor-dividers at SETI and VADJ , and at pin connec-
tions at CELL0 and CELL1. VADJ is connected to a
resistor-divider to set the charging voltage. The output
voltage-adjustment range is ±5%, eliminating the need
for 0.1% resistors while still achieving 0.75% set accu-
racy using 1% resistors.
The MAX745 consists of a current-mode, pulse-width-
modulated (PWM) controller and two transconductance
error amplifiers: one for regulating current (GMI) and
the other for regulating voltage (GMV) (Figure 2). The
error amplifiers are controlled via the SETI and VADJ
pins. Whether the MAX745 is controlling voltage or cur-
rent at any time depends on the battery state. If the bat-
tery is discharged, the MAX745 output reaches the
current-regulation limit before the voltage limit, causing
the system to regulate current. As the battery charges,
the voltage rises to the point where the voltage limit is
reached and the charger switches to regulating volt-
age. The STATUS pin indicates whether the charger is
regulating current or voltage.
V oltage Control
To set the voltage limit on the battery, tie a resistor-
divider to VADJ from REF. A 0V to V
REF
change at
VADJ sets a ±5% change in the battery limit voltage
around 4.2V. Since the 0 to 4.2V range on VADJ results
in only a 10% change on the voltage limit, the resistor-
divider’s accuracy does not need to be as high as the
output voltage accuracy. Using 1% resistors for the
voltage dividers typically results in no more than 0.1%
degradation in output voltage accuracy. VADJ is inter-
nally buffered so that high-value resistors can be used
to set the output voltage. When the voltage at VADJ is
M
S witc h-Mode Lithium-Ion
Battery Charger
_______________________________________________________________________________________
5
______________________________________________________________Pin Desc ription
IBAT
Current-Sense Amplifier’s Analog Current-Source Output. See Monitoring Charge Currentsection for
detailed description.
2
DCIN
Charger Input Voltage. Bypass DCIN with a 0.1μF capacitor.
3
4
5
VL
CCV
CCI
Chip Power Supply. Output of the 5.4V linear regulator from DCIN. Bypass VL with a 4.7μF capacitor.
Voltage-Regulation-Loop Compensation Point
Current-Regulation-Loop Compensation Point
1
8
VADJ
Voltage-Adjustment Pin. VADJ is tied to a 1% tolerance external resistor-divider to adjust the voltage set
point by 10%, eliminating the need for precision 0.1% resistors. The input voltage range is 0V to V
REF
.
SETI is externally tied to the resistor-divider between REF and GND to set the charging current.
7
REF
4.2V Reference Voltage Output. Bypass REF with a 0.1μF or greater capacitor.
6
THM/
SHDN
Thermistor Sense-Voltage Input. THM/
SHDN
also performs the shutdown function. If pulled low,
the charger turns off.
13
STATUS
An open-drain MOSFET sinks current when in current-regulation mode, and is high impedance when in volt-
age-regulation mode. Connect STATUS to VL through a 1k
to 100k
pull-up resistor. STATUS may also drive
an LED for visual indication of regulation mode (see MAX745 evaluation kit). Leave STATUS floating if not used.
Battery-Voltage-Sense Input and Current-Sense Negative Input
Current-Sense Positive Input
Power Ground
Low-Side Power MOSFET Driver Output
High-Side Power MOSFET Driver Output
Power Connection for the High-Side Power MOSFET Source
Power Input for the High-Side Power MOSFET Driver
11, 12
CELL1,
CELL0
Logic Inputs to Select Cell Count. See Table 1 for cell-count programming.
10
GND
Analog Ground
9
SETI
14
15
16
17
18
19
20
BATT
CS
PGND
DLO
DHI
LX
BST
NAME
FUNCTION
PIN
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MAX745EAP+ | 功能描述:電池管理 Switch-Mode Li Battery 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 |
| MAX745EAP+ | 制造商:Maxim Integrated Products 功能描述:CONVERTOR DC/DC ((NW)) |
| MAX745EAP+T | 功能描述:電池管理 Switch-Mode Li Battery 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 |
| MAX745EAP-T | 功能描述:電池管理 Switch-Mode Li Battery 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 |
| MAX745EVKIT | 功能描述:電池管理 Evaluation Kit for the MAX745 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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