Datasheet > ADP3801AR

ADP3801AR

更新时间： 2024-02-25 23:14:08

品牌	Logo	应用领域
亚德诺 - ADI		电池开关
页数	文件大小	规格书
20页	258K
描述
High Frequency Switch Mode Dual Li-Ion Battery Chargers

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中文翻译

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技术参数
数据手册

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ADP3801AR 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP,	针数：	16
Reach Compliance Code：	unknown	风险等级：	5.72
模拟集成电路 - 其他类型：	BATTERY CHARGE CONTROLLER	控制模式：	CURRENT/VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	20 V
最小输入电压：	4.1 V	标称输入电压：	10 V
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e0
长度：	9.9 mm	湿度敏感等级：	NOT SPECIFIED
功能数量：	1	端子数量：	16
最高工作温度：	85 °C	最低工作温度：	-40 °C
标称输出电压：	3.3 V	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	220
认证状态：	COMMERCIAL	座面最大高度：	1.75 mm
表面贴装：	YES	切换器配置：	SINGLE
最大切换频率：	250 kHz	温度等级：	INDUSTRIAL
端子面层：	TIN LEAD	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	宽度：	3.9 mm
Base Number Matches：	1

ADP3801AR 数据手册

ADP3801/ADP3802

system current and dynamically control the ADP3801/ADP3802’s

charge current.

VCC Greater Than 20 V Operation

Some ac/dc adapters have a poorly regulated output voltage

that can rise above the 20 V maximum operating voltage of the

ADP3801/ADP3802. The circuit in Figure 34 uses a Zener

diode and an NPN transistor to extend the ADP3801/ADP3802’s

maximum input voltage. The Zener should be at least 3 V higher

than the final battery voltage to meet the minimum headroom

requirements. 3 V is used to account for the V_BEdrop of the

2N3904 transistor and additional losses in the circuit. If V_IN

drops below the value of the Zener diode, VCC is no longer

regulated and it tracks V_IN. If the 2 V of headroom on the cur-

rent sense pins is not maintained, then the circuits of Figures 32

and 33 can also be used in conjunction with the circuit of Figure

34.

The current setting voltage is produced by R3 and R4 according

to the following formula:

I_SET

≈

10 R_CS

R3 + R4

This equation is approximate because the impedance of R2 and

R1 does effect the resistor divider of R3 and R4, but the impact

is small. As the system current increases, the voltage across R_SS

also increases. This voltage is subtracted from V_ISETwith a gain

set by R1 and R2. As the graph in Figure 35 shows, the charge

current reduces as the system current increases, and eventually

the charge current becomes zero (I_ZERO). The system current at

which this occurs can be set by selecting R1 and R2 according

to the following formula:

33␮H

40m⍀

10k⍀

100k⍀

140␮F

BAT

2N3904

10R_CS

0.1␮F

I_ZERO

≈

× ISET

R_SS

VCC

DRV

CS+ CS– A/B

EOC

Because the AD8531 is a single supply amplifier with its nega-

tive rail at ground, its output does not go below 0.0 V, so any

further increase in system current does not change V_ISET. De-

3.3V

BATA

BATB

signing a charger with a maximum charge current of 3A (R_CS

0.05 Ω) which reduces to zero when the system current reaches

7A (R_SS= 0.025 Ω) results in the following resistor values: R1 =

100 kΩ, R2 = 820 kΩ, R3 = 8.3 kΩ, R4 = 10 kΩ.

ADP3801/ADP3802

RESET

ISET

SYSTEM

VCC

AC/DC

SYSTEM

PROG

BRICK

100k⍀

820k⍀

100k⍀

GND

ADJ

COMP

OP193

820k⍀

10k⍀

8.3k⍀

Figure 34. VCC Greater Than 20 V Operation

BAT

The gate drive of the PFET is capacitively coupled to the DRV

pin with a 0.1 µF capacitor. While the DRV pin is switching, the

voltage swing on the DRV pin is coupled to the gate, but the dc

voltage is blocked. This allows the gate of the PFET to be at a

voltage that is higher than the absolute maximum rating of the

DRV pin. The 9 V Zener diode limits the gate drive voltage and

the 100 kΩ resistor provides a dc pull-up to turn the PFET off

when the DRV pin is not switching.

BAT

DRV

CS+

VCC

CS–

BAT

ADP3801/ADP3802

100k⍀

0.1␮F

ISET

System Current Sense Reduces Charge Current

In many applications the power required for the system and the

battery charger exceeds the total power available from the ac/dc

adapter. A design where battery charger current is decreased as

the system current increases helps to keep a constant power

demand on the brick. Dynamically adjusting the charge current

keeps the total power output of the brick constant. The circuit

in Figure 35 uses an external low cost amplifier to sense the

) = MAXIMUM CHARGE CURRENT

BAT

SET

ZERO

SYSTEM

Figure 35. System Current Sense Reduces Charge Current

–18–

REV. 0

1...15 16 171819 20

中文翻译

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与ADP3801AR相关器件

型号	品牌	获取价格	描述	数据表
ADP3801AR-REEL	ROCHESTER	获取价格	BATTERY CHARGE CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO16, SOIC-16
ADP3802	ADI	获取价格	High Frequency Switch Mode Dual Li-Ion Battery Chargers
ADP3802_15	ADI	获取价格	High Frequency Switch Mode Dual Li-Ion Battery Chargers
ADP3802AR	ADI	获取价格	High Frequency Switch Mode Dual Li-Ion Battery Chargers
ADP3802AR	ROCHESTER	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, SOIC-16
ADP3804	ADI	获取价格	High Frequency Switch Mode Li-Ion Battery Charger
ADP3804JRU	ADI	获取价格	High Frequency Switch Mode Li-Ion Battery Charger
ADP3804JRU-12.5-R7	ADI	获取价格	IC BATTERY CHARGE CONTROLLER, PDSO24, TSSOP-24, Switching Regulator or Controller
ADP3804JRU-12.5-RL	ADI	获取价格	IC BATTERY CHARGE CONTROLLER, PDSO24, TSSOP-24, Switching Regulator or Controller
ADP3804JRU-125	ADI	获取价格	High Frequency Switch Mode Li-Ion Battery Charger

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