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参数资料
| 型号： | MIC2224YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC CONV PWM BUCK 2MHZ 10-MLF |
| 标准包装： | 1 |
| 应用： | 转换器，2.5G，3G CDMA RF 功率放大器 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘，10-MLF? |
| 供应商设备封装： | 10-MLF?（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-2655-6 |
Micrel, Inc.
Functional Description
VIN
VIN provides power to the MOSFETs for the switch
mode regulator section, along with the current limiting
sensing. Due to the high switching speeds, a 1μF
capacitor is recommended close to VIN and the power
ground (PGND) pin for bypassing.
AVIN
Analog VIN (AVIN) provides power to the internal
reference and control section. AVIN and VIN must be
tied together. Careful layout should be considered to
ensure high frequency switching noise caused by VIN is
reduced before reaching AVIN.
DAC
The DAC pin is the control pin that sets the output
voltage. The Output voltage is 3X the voltage set on the
DAC pin. When 1.2V or greater is applied to the DAC
pin, the MIC2224 enters bypass mode. In bypass mode,
the input supply is connected to the output through a
40m ? P-Channel MOSFET.
EN
The enable pin provides a logic level control of the
output. In the off state, supply current of the device is
greatly reduced (typically <1μA). Also, in the off state,
the output drive and bypass switch are placed in a "tri-
stated" condition, where both the high side P-channel
Mosfet and the low-side N-channel are in an off or non-
conducting state. Do not drive the enable pin above the
supply voltage.
MIC2224
VOUT
The VOUT pin connects the internal bypass drain and
the feedback signal to the output. The bypass applies
the input voltage through a low resistance (40m ?
typical) P-Channel MOSFET switch. The feedback signal
provides the control path to set the output at 3X the DAC
voltage.
SW
The switch (SW) pin connects directly to the inductor
and provides the switching current necessary to operate
in PWM mode. Due to the high speed switching on this
pin, the switch node should be routed away from
sensitive nodes.
PGND
Power ground (PGND) is the ground path for the high
current PWM mode. The current loop for the power
ground should be as small as possible and separate
from the Analog ground (AGND) loop.
AGND
Signal ground (AGND) is the ground path for the biasing
and control circuitry. The current loop for the signal
ground should be separate from the Power ground
(PGND) loop.
September 2006
10
M9999-091106
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