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參數(shù)資料
| 型號(hào)： | MC34701EK |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | 1.5 A Switch-Mode Power Supply with Linear Regulator |
| 中文描述： | 1.5開(kāi)關(guān)模式電源，線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 25/38頁(yè) |
| 文件大小： | 739K |
| 代理商： | MC34701EK |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
25
34701
FUNCTIONAL DESCRIPTION
FUNCTIONAL DEVICE OPERATION
INVERTED OPERATING MODE
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., 1.5 V nominal), and the
switcher VOUT operates independently. Power sequencing
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
2.1 V differential requirement between the I/O (VIN) and the
core (LDO), the LDO must start up at 2.1 V or less and be
able to maintain the 2.1 V or less differential. The maximum
slew rate for V
IN
is 1.0 V/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 0.4 V.
Shorted Load
1.
LDO shorted to ground.
This will cause the I/O voltage
to exceed the core voltage by more than 2.1 V. 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 0.4 V. 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 5.0 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., 1.5 V nominal) (see
Figure 19
, page
22
).
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
Methods of Control on page 22
.
2.
LDO rises faster than VOUT.
The LDO uses control
methods (5) and (6) described in the section
Methods
of Control on page 22
.
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.
LDO falls faster than VOUT .
The VOUT uses control
methods (4) and (5) described in the section
Methods
of Control on page 22
.
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 VOUT
load capacitor into the VIN supply.
2.
VOUT falls faster than LDO.
The LDO uses control
methods (
5
) and (
6
) described in the section
Methods
of Control on page 22
.
Shorted Load
1.
LDO shorted to ground.
The VOUT uses methods (1)
and (2) described in the section
Methods of Control on
page 22
.
2.
VOUT shorted to ground.
The LDO uses control
methods (5) and (6) described in the section
Methods
of Control on page 22
.
3. VIN1 shorted to ground. Device is not working.
4.
VIN2 shorted to ground.
This is equivalent to the
switcher V
OUT
output shorted to ground.
5.
LDO shorted to supply.
No load protection. 34701 is
protected by current limit and Thermal Shutdown.
6.
VOUT shorted to supply.
No load protection. 34701 is
protected by current limit and Thermal Shutdown.
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