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参数资料
| 型号： | KIT33702DWBEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 25/39页 |
| 文件大小： | 0K |
| 描述： | KIT FEATURES THE MC34701 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 2，非隔离 |
| 输入电压： | 2.8 ~ 6V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，软件 |
| 已用 IC / 零件： | MC34702 |
| 相关产品： | MC34702EKR2CT-ND - IC POWER SUPPLY MCU 3A 32-SOIC MC34702EKR2TR-ND - IC POWER SUPPLY MCU 3A 32-SOIC MC34702EK-ND - IC POWER SUPPLY MCU 3A 32-SOIC |
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FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Single 5.0V Supply, VIN1 = VIN2, or Dual Supply VIN1 ?
VIN2
The LDO supplies the microprocessor I/O voltage. The
switcher supplies the core (e.g., 1.5V nominal) (see
Power-up
This condition depends upon the regulator current limit,
load current and capacitance, and the relative rise times of
the VIN1 and VIN2 supplies. There are two cases:
1. LDO rises faster than VOUT . The LDO uses control
methods (1) and (2) described in the section Methods
2. VOUT rises faster than LDO. The switcher uses control
methods (5) and (6) described in the section Methods
Power-down
This condition depends upon the regulator load current
and capacitance, and the relative fall times of the VIN1 and
VIN2 supplies. There are two cases:
1. VOUT falls faster than LDO. The LDO uses control
methods (1) and (2) described in the section Methods
In the case VIN1 = VIN2, the intrinsic operation turns
on both the buck high side MOSFET and the LDO
external Pass MOSFET, and discharges the LDO load
capacitor into the VIN supply.
2. LDO falls faster than VOUT . The switcher uses control
methods (5) and (6) described in the section Methods
Shorted Load
1. VOUT shorted to ground. The LDO uses method (1)
2. LDO shorted to ground. The switcher uses control
methods (5) and (6) described in the section Methods
3. VIN1 shorted to ground. The device is not working.
4. VIN2 shorted to ground with VIN1 and VIN2 different.
This is equivalent to the switcher output shorted to
ground.
5. VOUT shorted to supply. No load protection. 34702 is
protected by current limit and thermal shutdown.
6. LDO shorted to supply. No load protection. 34702 is
protected by current limit and thermal shutdown.
INVERTED OPERATING MODE
Single 3.3V Supply, VIN = VIN1 = VIN2 = 3.3V
The 3.3V supplies the microprocessor I/O voltage, the
LDO supplies core voltage (e.g., 1.5V nominal), and the
depends only on the normal LDO intrinsic operation to control
the Pass MOSFET.
Power-up
When VIN is rising, initially LDO is below the regulation
point and the Pass MOSFET is on. In order not to exceed the
2.1V differential requirement between the I/O (VIN) and the
core (LDO), the LDO must start up at 2.1V or less and be able
to maintain the 2.1V or less differential. The maximum slew
rate for V IN is 1.0V/ms.
Power-down
When VIN is falling, LDO falls below the regulation point;
therefore, the Pass MOSFET is on. In the case where LDO is
falling faster than VIN, the Pass MOSFET attempts to
maintain LDO. In the case where VIN is falling faster than
LDO, the Pass MOSFET is also on, and the LDO load
capacitor is discharged through the Pass MOSFET to VIN.
Thus, provided VIN does not fall too fast, the core voltage
(LDO) does not exceed the I/O voltage (VIN) by more than
maximum of 0.4V.
Shorted Load
1. LDO shorted to ground. This will cause the I/O voltage
to exceed the core voltage by more than 2.1V. No load
protection.
2. VIN shorted to ground. Until the LDO load capacitance
is discharged, the core voltage exceeds the I/O voltage
by more than 0.4V. By the intrinsic operation of the
LDO, the load capacitor is discharged rapidly through
the Pass MOSFET to VIN.
3. LDO shorted to supply. No load protection.
Single 5.0V Supply, VIN1 = VIN2, or Dual Supply VIN1 ?
VIN2
The switcher VOUT supplies the microprocessor I/O
voltage. The LDO supplies the core (e.g., 1.5V nominal) (see
Power-up
This condition depends upon the regulator current limit,
load current and capacitance, and the relative rise times of
the VIN1 and VIN2 supplies. There are two cases:
1. VOUT rises faster than LDO. The switcher VOUT uses
control methods (1) and (2) described in the section
2. LDO rises faster than VOUT . The LDO uses control
methods (5) and (6) described in the section Methods
Power-down
This condition depends upon the regulator load current
and capacitance and the relative fall times of the VIN1 and
VIN2 supplies. There are two cases:
switcher VOUT operates independently. Power sequencing
34702
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
25
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