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參數(shù)資料
| 型號： | PC33702DWBR2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO32 |
| 封裝： | PLASTIC, SOIC-32 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 647K |
| 代理商： | PC33702DWBR2 |
33702
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
18
Shorted Load
1. VOUT shorted to ground. The LDO uses method (1) and
(2) described in the Methods of Control section, page 16.
2. LDO shorted to ground. The switcher uses control
methods (4) and (5) described in the Methods of Control
section, page 16.
3. VIN1 shorted to ground. This is equivalent to the LDO
output shorted to ground.
4. VIN2 shorted to ground. This is equivalent to the switcher
output shorted to ground.
5. VOUT shorted to supply. No load protection. 33702
protected by current limit and thermal limit.
6. LDO shorted to supply. No load protection. 33702
protected by current limit and thermal limit.
Inverted Operating Mode
1. Single 3.3 V Supply, VIN = VIN1 = VIN2 = 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
VOUT operates independently. Power sequencing depends only
on the normal LDO intrinsic operation to control the Pass FET.
Power Up
When VIN is rising, initially LDO will be below the regulation
point and the Pass FET will be on. In order not to exceed the
2.0 V differential requirement between the I/O (VIN) and the
core (LDO), the LDO must start up at 2.0 V or less and be able
to maintain the 2.0 V or less differential. The maximum slew
rate for VIN is 1.0 V/ms.
Power Down
When VIN 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 VIN, the Pass FET will attempt to maintain
LDO. In the case where VIN is falling faster than LDO, the Pass
FET is also on, and the LDO load capacitor will be discharged
through the Pass FET to VIN. Thus, provided VIN does not fall
too fast, the core voltage (LDO) will not exceed the I/O voltage
(VIN) 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 2.0 V. No load
protection.
2. VIN 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 VIN.
3. LDO shorted to supply. No load protection.
2. Single 5.0 V Supply, VIN1 = VIN2, or Dual Supply VIN1 ≠
VIN2
The switcher VOUT supplies the microprocessor I/O voltage.
The LDO supplies the core (e.g., 1.8 V nominal) (see Figure 12,
page 16).
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 2 cases:
1. VOUT rises faster than LDO. The switcher VOUT uses
control methods (4) and (5) described in the Methods of
2. LDO rises faster than VOUT . The LDO uses control
methods (1) and (2) described in the Methods of Control
section, page 17.
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 2 cases:
1. LDO falls faster than VOUT . The VOUT uses control
methods (4) and (5) described in the Methods of Control
section, page 17.
In the case VIN1 = VIN2 the intrinsic operation will turn both
the Buck High-Side FET and the LDO external Pass FET,
and will discharge the VOUT load capacitor into the VIN
supply.
2. VOUT falls faster than LDO. The LDO uses control
methods (1) and (2) described in the Methods of Control
section, page 17.
Shorted Load
1. LDO shorted to ground. The VOUT uses methods (4) and
(5) described in the Methods of Control section, page 17.
2. VOUT shorted to ground. The LDO uses control methods
(1) and (2) described in the Methods of Control section.
3. VIN1 shorted to ground. This is equivalent to the LDO
output shorted to ground.
4. VIN2 shorted to ground. This is equivalent to the switcher
VOUT output shorted to ground.
5. LDO shorted to supply. No load protection.
6. VOUT shorted to supply. No load protection. 33702
protected by current limit and thermal limit.
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