参数资料
| 型号： | MC34703PNB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 24/46页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY QUICC 33-QFN |
| 标准包装： | 1 |
| 应用： | 电源 |
| 电流 - 电源： | 60mA |
| 电源电压： | 2.8 V ~ 13.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 33-PowerQFN |
| 供应商设备封装： | 33-PQFN（10x10） |
| 包装： | 管件 |
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FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Shorted Load
1. V OUT shorted to ground. The LDO uses method (1)
and (2) described in the Methods of Control section.
2. LDO shorted to ground. The switcher uses control
methods (4) and (5) described in the Methods of
Control section, page 22 .
3. V IN1 shorted to ground. This is equivalent to the LDO
output shorted to ground.
4. V IN2 shorted to ground. This is equivalent to the
switcher output shorted to ground.
5. V OUT shorted to supply. No load protection. 34703
protected by current limit and thermal limit.
6. LDO shorted to supply. No load protection. 34703
protected by current limit and thermal limit.
INVERTED OPERATING MODE
Single 3.3 V Supply, V IN = V IN1 = V IN2 = 3.3 V
The 3.3 V supplies the microprocessor I/O voltage, the
LDO supplies core voltage (e.g., 1.8 V nominal), and the
switcher V OUT operates independently. Power sequencing
depends only on the normal LDO intrinsic operation to control
the Pass FET.
Power Up
When V IN is rising, initially LDO will be below the
regulation point and the Pass FET will be on. In order not to
exceed the 2.5 V differential requirement between the I/O
(V IN ) and the core (LDO), the LDO must start up at 2.5 V or
less and be able to maintain the 2.5 V or less differential. The
maximum slew rate for V IN is 1.0 V/ms.
Power Down
When V IN is falling, LDO will be below the regulation point;
therefore the Pass FET will be on. In the case where LDO is
falling faster than V IN , the Pass FET will attempt to maintain
LDO. In the case where V IN is falling faster than LDO, the
Pass FET is also on, and the LDO load capacitor will be
discharged through the Pass FET to V IN . Thus, provided V IN
does not fall too fast, the core voltage (LDO) will not exceed
the I/O voltage (V IN ) by more than maximum of 0.4 V.
Shorted Load
1. LDO shorted to ground. This will cause the I/O voltage
to exceed the core voltage by more than 2.5 V. The
load is protected by a current limit.
2. V IN shorted to ground. Until the LDO load capacitance
is discharged, the core voltage will exceed the I/O
voltage by more than 0.4 V. By the intrinsic operation of
the LDO, the load capacitor will be discharged rapidly
through the Pass FET to V IN .
3. LDO shorted to supply. No load protection.
Single 5.0 V Supply, V IN1 = V IN2 , or Dual Supply
V IN1 ≠ V IN2
The switcher V OUT supplies the microprocessor I/O
voltage. The LDO supplies the core (e.g., 1.8 V nominal) (see
Power Up
This condition depends upon the regulator current limit,
load current and capacitance, and the relative rise times of
the V IN1 and V IN2 supplies. There are 2 cases:
1. V OUT rises faster than LDO. The switcher V OUT uses
control methods (1) and (2) described in the Methods
of Control section, page 23 .
2. LDO rises faster than V OUT . The LDO uses control
methods (4) and (5) described in the Methods of
Control section.
Power Down
This condition depends upon the regulator load current
and capacitance and the relative fall times of the V IN1 and
V IN2 supplies. There are 2 cases:
1. LDO falls faster than V OUT . The V OUT uses control
methods (1) and (2) described in the Methods of
Control section, page 23 .
In the case V IN1 = V IN2 the intrinsic operation will turn both
the Buck High-Side FET and the LDO external Pass FET,
and will discharge the V OUT load capacitor into the V IN
supply.
2. V OUT falls faster than LDO. The LDO uses control
methods (4) and (5) described in the Methods of
Control section.
Shorted Load
1. LDO shorted to ground. The V OUT uses methods (1)
and (2) described in the Methods of Control section,
page 23 .
2. V OUT shorted to ground. The LDO uses control
methods (4) and (5) described in the Methods of
Control section.
3. V IN1 shorted to ground. This is equivalent to the LDO
output shorted to ground.
4. V IN2 shorted to ground. This is equivalent to the
switcher V OUT output shorted to ground.
5. LDO shorted to supply. No load protection.
6. V OUT shorted to supply. No load protection. 34703
protected by a thermal limit.
34703
Analog Integrated Circuit Device Data
24
Freescale Semiconductor
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