参数资料
型号: AT73C209-EK
厂商: Atmel
文件页数: 33/63页
文件大小: 0K
描述: BOARD EVAL FOR AT73C209
标准包装: 1
系列: PMAAC™
主要目的: 电源管理,专用型: 手机
已用 IC / 零件: AT73C209
已供物品: 板,CD,文档
AT73C209
9.3
9.3.1
LDO2: 2.4V to 3.0V for Internal Analog Section Supply
Features
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Low Noise Low Drop Out Voltage Regulator
2.4V to 3V Programmable Output Voltage
2.7V to 3.5V Supply Operation (VANA = 2.4V, 2.6V, 2.8V)
3.2V to 3.5V Supply Operation (VANA = 3V)
60mA of Max Load Current
Power-down Mode (Consumption <1mA)
Typical cUrrent Consumption 195 μA
9.3.2
Description
LDO2 is a Low Drop Out (LDO) voltage regulator with a programmable 2.4V to 3V output volt-
age, rated for loads up to 20 mA. The circuit comprises a PMOS pass device, an error amplifier,
a feedback resistive network sized to have closed loop gain. These blocks constitute the regulat-
ing loop. A 2-bit decoder allows controlling the programmable output voltage. Available output
voltages are 2.4V, 2.6V, 2.8V and 3V. An over-current and short-circuit protection circuit has
been included to limit the output current delivered by the regulator, thus avoiding its destruction
in short circuit configuration. An external reference voltage (bandgap voltage) is needed. The
target reference voltage is 1.231V delivered. A ceramic or low ESR tantalum capacitor is needed
(2.2 μF minimum value) as external compensation.
9.3.3
Functional Diagram and Typical Application
Figure 9-4.
Input
LDO2 Typical Application Diagram
V ANA
from
V BOOST
V ANA
LDO1
Output
ref
2,2 μF
gnd
LDO2
33
6365A–PMAAC–12-Mar-08
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