- 您现在的位置：买卖IC网 > PDF目录16677 > ADP2291RM-EVALZ (Analog Devices Inc)BOARD EVAL ADP2291 PDF资料下载
参数资料
| 型号： | ADP2291RM-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL ADP2291 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADP2291 |
| 主要属性： | 锂离子电池，750mA 时为 4.2V 输出，4.5 ~ 5.5 Vin |
| 次要属性： | LED 状态指示器，深度放电，预充电，热关闭模式 |
| 已供物品： | 板 |
ADP2291
In cases where the voltage drop across the protection device
must be kept low, a P MOSFET is recommended. Connect the
The power handling capability of the PNP pass transistor is
another important parameter. The maximum power dissipation
of the pass transistor is estimated using
INPUT
4.6V–12V
CIN
RS
P DISS (W) = I MAX × (V ADAPTER(MAX) ? V PROTECT ? V RS ? V BAT ) (7)
IN
CHG
CS DRV
ADP2291
where V RS = 50 mV to 150 mV at V ADJ = 1.5 V to 3.0 V,
V BAT = 2.8 V, the lowest cell voltage where fast charge can occur.
Note that the adapter voltage can be either preregulated or
unregulated. In the preregulated case, the difference between
β MIN = I MAX = I MAX
Figure 21. Reverse Input Protection
EXTERNAL PASS TRANSISTOR
Choose the external PNP pass transistor based on the given
operating conditions and power handling capabilities. The pass
device is determined by the base drive available, the input and
output voltage, and the maximum charge current.
Select the pass transistor with a collector-emitter breakdown
voltage that exceeds the maximum adapter voltage. A V CEO
rating of at least 15 V is recommended.
Providing a charge current of I MAX with a minimum base drive
of 40 mA requires a PNP beta of at least
(5)
I Β 40 mA
Note that the beta of a transistor drops off with collector
current. Therefore, make sure the beta at I MAX meets the
minimum requirement.
For cases where the adapter voltage is low (less than 5.5 V),
calculate the saturation voltage by
the maximum and minimum adapter voltage is small. In this
case, use the maximum regulated adapter voltage to determine
the maximum power dissipation. In the unregulated case, the
adapter voltage can have a wide range specified. However, the
maximum voltage specified is usually with no load applied.
Therefore, the worst-case power dissipation calculation often
leads to an over-specified pass device. In either case, it is best to
determine the load characteristics of the adapter to optimize the
charger design.
For example:
V ADAPTER(MIN) = 5.0 V
V ADAPTER(MAX) = 6.0 V
I MAX = 500 mA
V PROTECT = 0.2 V at 500 mA
V ADJ = 3 V
V RS = 150 mV
β MIN = I MAX = 500 mA = 12 . 5
I Β 40 mA
V CE(SAT ) = V ADAPTER(MIN) ? V PROTECT ? V RS ? V BAT
= 5.0 V ? 0.2 V ? 0.15 V ? 4.2 V
= 0.45 V
V CE(SAT) = V ADAPTER(MIN) ? V PROTECT ? V RS ? V BAT
where V PROTECT is the forward drop of the reverse input
protection.
(6)
P DISS (W ) = I M AX × ( V ADAPTER(MAX) ? V PROTECT ? V RS ? V BAT )
= 0.50 A × (6.0 V ? 0.2 V ? 0.15 V ? 2.8 V)
= 1.4 W
Table 5. PNP Pass Transistor Selection Guide
Vendor
Fairchild
ON Semiconductor?
Philips
ZETEX
Part Number
FSB6726
NZT45H8
MTB35200
BCP53T1
MMJT9435
BCP51
ZXT10P20DE6
ZXT2M322
FZT549
FMMT549
Package
SuperSOT
SOT223
TSOP-6
SOT223
SOT223
SOT223
SOT23-6
2 mm × 2 mm MLP
SOT223
SOT23
Max PD @ 25°C
0.5 W
1.5 W
0.625 W
1.5 W
1.6 W
1.3 W
1.1 W
1.5 W
2W
0.5 W
Beta @ 1 A
150
110
200
35
200
50
270
270
130
130
VCE (SAT)
0.5 V
0.1 V
0.175 V
0.3 V
0.18 V
0.5 V
0.17 V
0.17 V
0.25 V
0.25 V
Rev. A | Page 13 of 20
相关PDF资料 |
PDF描述 |
|---|---|
| A3BBB-1406M | IDC CABLE- ASR14B/AE14M/ASR14B |
| EGM06DTMT-S189 | CONN EDGECARD 12POS R/A .156 SLD |
| 1624094-5 | INDUCTOR 150UH 105MA 1812 |
| H4PXH-2418G | DIP CABLE - HDP24H/AE24G/X |
| VI-BW0-EX | CONVERTER MOD DC/DC 5V 75W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2300 | 制造商:AD 制造商全称:Analog Devices 功能描述:1.2 A, 20 V, 700 kHz/1.4 MHz, Nonsynchronous Step-Down Regulator |
| ADP2300AUJZ | 制造商:Analog Devices 功能描述:IC BUCK REG 1.2A 6TSOT 制造商:Analog Devices 功能描述:IC, BUCK, REG, 1.2A, 6TSOT 制造商:Analog Devices 功能描述:IC, BUCK, REG, 1.2A, 6TSOT; Primary Input Voltage:20V; No. of Outputs:1; Output Voltage:800mV; Output Current:1.2A; Voltage Regulator Case Style:TSOT; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:125C; ;RoHS Compliant: Yes |
| ADP2300AUJZ-R2 | 功能描述:直流/直流开关调节器 20V 1.2A Non-Sync Step Down DC-DC RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ADP2300AUJZ-R7 | 功能描述:IC REG BUCK ADJ 1.2A TSOT23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色产品:BD91x Series Step-Down Regulators 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:2 输出电压:3.3V，0.8 V ~ 2.5 V 输入电压:4.5 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:1MHz 电流 - 输出:1.5A 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 包装:带卷 (TR) 供应商设备封装:VQFN020V4040 产品目录页面:1373 (CN2011-ZH PDF) 其它名称:BD9152MUV-E2TR |
| ADP2300AUJZ-R7 | 制造商:Analog Devices 功能描述:IC, DC-DC CONV, 6TSOT |
发布紧急采购，3分钟左右您将得到回复。