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| 型号： | PC34703PNB/R2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 稳压器 |
| 英文描述： | 18 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PQCC33 |
| 封装： | 10 X 10 MM, 2.1 MM HEIGHT, 0.8 PITCH, PLASTIC, QFN-33 |
| 文件页数： | 11/46页 |
| 文件大小： | 2509K |
| 代理商： | PC34703PNB/R2 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
19
34703
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
INTRODUCTION
The 34703 incorporates a high-performance synchronous
buck regulator, supplying the microprocessor’s core, and a
low dropout (LDO) linear regulator providing the
microprocessor I/O and bus voltages. This device
incorporates many advanced features; e.g., precisely
maintained up/down power sequencing, ensuring the proper
operation and protection of the CPU and power system.
Figure 11. 34703 Functional Internal Block Diagram
Boost Regulator
A boost regulator provides a high voltage necessary to
properly drive the buck regulator power MOSFETs,
especially during the low input voltage condition. The LDO
regulator external N-channel MOSFET gate is also powered
from the boost regulator. In order to properly enhance the
high-side MOSFETs when only a +3.3 V supply rail powers
the integrated circuit, the boost regulator provides an output
voltage of 8.0 V nominal value.
The 34703 boost regulator uses a simple hysteretic
current control technique, which allows fast power-up and
does not require any compensation. When the boost
regulator main power switch (low side) is turned on, the
current in the inductor starts to ramp up. After the inductor
current reaches the upper current limit (nominally set at
1.0 A), the low-side switch is turned off and the current
charges the output capacitor through the internal rectifier.
When the inductor current falls below the valley current limit
value (nominally 600 mA), the low-side switch is turned on
again, starting the next switching cycle. After the boost
regulator output capacitor reaches its regulation limit, the low-
side switch is turned off until the output voltage falls below the
regulation limit again.
Should the input voltage be higher than 8.0 V, an internal
low drop output linear regulator provides the power to the
device. In this configuration, there is no need to use the boost
regulator, hence the external boost inductor can be removed.
Boost Regulator
Reset Control
Power Sequencing
I2C Interface
Voltage Margining
Thermal Shutdown
Switcher
UVLO
Buck Control Logic
Linear Regulator
ILIM
Buck HS and
LS Driver
Control
Oscillator
300 kHz
Watchdog Timer
POR Timer
Protection
Buck Regulator
Communication
Reset Control
POR Timer
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