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| 型号： | MAX1757EAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/17页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHRG LI+ 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 6 V ~ 14 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
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:
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
? ?
V REF ? 1 +
?
V DCIN ( MIN ) ? ?
?
C OUT >
V BATT
?
V BATT x f OSC x R CS
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)
R ESR <
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:
R CS x V BATT
V REF
where:
R ESR is the output capacitor ESR.
R CS is the current-sense resistor from CS to BATT
(100m Ω 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
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.
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages . Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character,
but the drawing pertains to the package regardless of RoHS status.
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.
PACKAGE
TYPE
5 SOT23
PACKAGE
CODE
U5-2
OUTLINE
NO.
LAND
PATTERN NO.
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.
16
Maxim Integrated
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相关代理商/技术参数 |
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|---|---|
| MAX1757EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX1757 MAX1758 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 |
| MAX17582GTL+ | 制造商:Maxim Integrated Products 功能描述:1.2MHZ LOW-COST HIGH-PERFORMANCE - Rail/Tube |
| MAX17582GTM+ | 功能描述:电流型 PWM 控制器 Dual-Phase Quick-PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17582GTM+T | 功能描述:电流型 PWM 控制器 Dual-Phase Quick-PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1758EAI | 功能描述:电池管理 Li+ Battery Charger w/28V Switch 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 |
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