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AT73C204
Figure 8 shows the Power Supply Rejection Ratio as functions of frequency and battery
voltage. If a noise signal occurs at 1 kHz when the battery voltage is at 3V, the noise will
be attenuated by 70 dB (divided by more than 3000) at the output of the regulator. Con-
sequently, a 2V spike on the battery is attenuated to less than 1 mV, which is low
enough to avoid any risk of malfunction by a device supplied by the regulator.
Figure 8. Power Supply Rejection Ratio in Function of Frequency and Battery Voltage
P o w e r S u p p ly R e je ctio n Ra tio a t F u ll L o a d
P o w e r S u p p ly R e je ctio n R a ti o a t F u ll L o a d
ve rsu s B a tte ry V o lta g e
10
100
1000
10000
100000
-30
3.0
3.5
4.0
4.5
5.0
5.5
-35
-30
-40
-45
-50
V B A T = 3V
-40
-50
-60
-55
-60
V B A T = 4.25V
-70
-80
F req = 1 k Hz
-65
V B A T = 5.5V
-90
F req = 20 k Hz
F req = 100 k Hz
-100
-70
-75
-80
-110
-120
F req = 100 Hz
B a tte ry V o lta g e [V ]
Fr e q [ Hz ]
LDO2, LDO6
The first approach to reducing standby current is to decrease the standby current inside
the regulators themselves. Atmel achieves this by implementing a dual mode architec-
ture where two output transistors are used in parallel as switches in the regulation loop.
Figure 9 illustrates this architecture.
Figure 9. Functional Diagram of LDO Dual Mode
V BAT
V BG
ON
GND
ON
LP
ON
LP
Current Sensing
and Limiting
GND
R1
V OUT
V OUTS
ON
LP
GND
V BG
ON
R2
ON
IBIAS
ON, LP
GND
GND
9
6014A–PMGMT–10/03
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相关代理商/技术参数
AT73C204-EK1
功能描述:开发板和工具包 - ARM COMPLETE EVAL KIT
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
AT73C204-EK2
功能描述:开发板和工具包 - ARM UNSOLDERED EVAL KIT
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
AT73C204J
功能描述:电池管理 Monolithic numeric 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
AT73C205
功能描述:其他电源管理 NGD MONOLITHIC NUMERIC IC RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel
AT73C206
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management And Analog Companions (PMAAC)
AT73C209
功能描述:其他电源管理 NGD : MONOLITHIC NUMERIC IC RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel
AT73C209-EK
功能描述:开发板和工具包 - ARM AT73C209 EVALUATION BOARD
RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
AT73C211
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management