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參數(shù)資料
| 型號(hào)： | MAX1757 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Stand-Alone, Switch-Mode Li Battery Charger with Internal 14V Switch |
| 中文描述： | 獨(dú)立的開(kāi)關(guān)模式Li+電池充電器，內(nèi)置14V開(kāi)關(guān) |
| 文件頁(yè)數(shù)： | 16/17頁(yè) |
| 文件大小： | 218K |
| 代理商： | MAX1757 |
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M
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
16
______________________________________________________________________________________
capacitance and ESR rating of the capacitor are impor-
tant for its effectiveness as a filter and to ensure stabili-
ty of the PWM circuit. The minimum output capacitance
for stability is:
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.
The maximum output capacitor ESR required for stabili-
ty is:
where:
R
ESR
is the output capacitor ESR.
R
CS
is the current-sense resistor from CS to BATT
(100m
typ).
Setting the Timers
The MAX1757 contains four timers: a prequalification
timer, fast-charge timer, full-charge timer, and top-off
timer. Connecting a capacitor from TIMER1 to GND
and TIMER2 to GND sets the timer periods. The
TIMER1 input controls the prequalification, full-charge,
and top-off times while TIMER2 controls the fast-charge
timeout. The typical timeouts for a 1C charge rate are
set to 7.5 minutes for the prequalification timer, 90 min-
utes for the fast-charge timer, 90 minutes for the full-
charge timer, and 45 minutes for the top-off timer by
connecting 1nF capacitors to TIMER1 and TIMER2.
Each timer period is directly proportional to the capaci-
tance at the corresponding pin (see
Typical Operating
Characteristics
).
Compensation
Each of the three regulation loops
—
the input current
limit, the charging current limit, and the charging volt-
age limit
—
can be compensated separately at the CCS,
CCI, and CCV pins, respectively.
The charge-current loop error amp output is brought
out at CCI. Likewise, the source-current error amplifier
output is brought out at CCS; 0.1μF 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 amp output is brought
out at CCV. Compensate this loop by connecting a
capacitor in parallel with a series resistor-capacitor (RC)
from CCV to GND. Recommended values are shown in
Figure 1.
Applications Information
Diode Selection
A Schottky rectifier with a rating of at least 1.5A must
be connected from LX to PGND.
VL and REF Bypassing
The MAX1757 uses an internal linear regulator to drop
the input voltage down to 5.4V, which powers the inter-
nal circuitry. The output of the linear regulator is the VL
pin. The internal linear regulator may also be used to
power external circuitry as long as the maximum cur-
rent of the linear regulator is not exceeded.
A 4.7μF bypass capacitor is required at VL to ensure that
the regulator is stable. A 1μF bypass capacitor is also
required between REF and GND to ensure that the inter-
nal 4.2V reference is stable. In both cases, use a low-ESR
ceramic capacitor.
Chip Information
TRANSISTOR COUNT: 5996
R
R
x V
V
REF
ESR
CS
BATT
<
C
V
V
V
V
x f
x R
OUT
REF
BATT
DCIN MIN
BATT
OSC
CS
>
+
)
1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1757EAI | Stand-Alone, Switch-Mode Li Battery Charger with Internal 14V Switch |
| MAX1758 | Replaced by TMS320C6410 : Digital Signal Processor 100-LQFP |
| MAX1758EAI | Stand-Alone, Switch-Mode Li Battery Charger with Internal 28V Switch |
| MAX1759 | Replaced by TMS320C6410 : Digital Signal Processor 100-LQFP |
| MAX1759EUB | Buck/Boost Regulating Charge Pump in レMAX |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1757EAI | 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 |
| MAX1757EAI+ | 功能描述:電池管理 Li+ Battery Charger w/Int 14V Switch 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 |
| MAX1757EAI+T | 功能描述:電池管理 Li+ Battery Charger w/Int 14V Switch 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 |
| MAX1757EAI-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 |
| MAX1757EVKIT | 功能描述:電池管理 Evaluation Kit for the MAX1757 MAX1758 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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