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参数资料
| 型号： | MAX1737EEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/18页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR BAT CHARGE 28-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-QSOP |
| 包装： | 带卷 (TR) |
MAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
For the high-side switch, the worst-case power dissipa-
tion due to on-resistance occurs at the minimum source
voltage V DCIN(MIN) and the maximum battery voltage
V BATT(MAX) , and can be approximated by the equation:
connect a Schottky rectifier across the drain source of
the synchronous rectifier to stop the body diode from
conducting. The Schottky rectifier may be omitted, typi-
cally degrading the efficiency by approximately 1% to
2%, causing a corresponding increase in the low-side
P R ≈
V BATT(MAX )
V DCIN ( MIN )
× R DS ( ON ) × I CHG 2
synchronous-rectifier power dissipation.
VL and REF Bypassing
P T ≈ DCIN CHG TR
The transition loss can be approximated by the equation:
V × I × f × t
3
where t TR is the MOSFET transition time. So the total
power dissipation of the high-side switch is P TOT = P R
+ P T .
The worst-case synchronous-rectifier power occurs at
the minimum battery voltage V BATT(MIN) and the maxi-
mum source voltage V DC(MAX) , and can be approxi-
mated by:
The MAX1737 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 current
and power dissipation of the linear regulator are not
exceeded. The synchronous-rectifier MOSFET gate dri-
ver (DLO) is powered from VLO. An internal 12 Ω resistor
from VL to VLO provides the DC current to power the
gate driver. Bypass VLO to PGND with a 0.1μF or
greater capacitor.
A 4.7μF bypass capacitor is required at VL to ensure
that the regulator is stable. A 1μF bypass capacitor is
P DL ≈
V DCIN(MAX ) ? V BATT(MIN)
V DCIN ( MAX )
× R DS ( ON ) × I CHG 2
also required between REF and GND to ensure that the
internal 4.2V reference is stable. In both cases use a
low-ESR ceramic capacitor.
There is a brief dead time where both the high-side
switch and synchronous rectifier are off. This prevents
crowbar currents that flow directly from the source volt-
age to ground. During the dead time, the inductor cur-
rent will turn on the synchronous-rectifier MOSFET body
diode, which may degrade efficiency. To prevent this,
Maxim Integrated
TRANSISTOR COUNT: 5978
Chip Information
17
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相关代理商/技术参数 |
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| MAX1737EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX1737 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 |
| MAX1739EEP | 功能描述:显示驱动器和控制器 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 |
| MAX1739EEP+ | 功能描述:显示驱动器和控制器 CCFL Backlight Controller 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 |
| MAX1739EEP+T | 功能描述:显示驱动器和控制器 CCFL Backlight Controller 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 |
| MAX1739EEP-T | 功能描述:显示驱动器和控制器 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 |
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