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參數(shù)資料
| 型號： | PC34704BEP |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC56 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, 0.40 MM PITCH, ROHS COMPLIANT, QFN-56 |
| 文件頁數(shù)： | 16/50頁 |
| 文件大小： | 2010K |
| 代理商： | PC34704BEP |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
23
34704
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT3 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
Characteristics
It powers up directly from the battery
Operates at a switching frequency equals to FSW1
Drives integrated low RDS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
The output is ±4% accuracy
Output voltage is adjustable by means of an external
resistor divider
The output can be adjusted up or down at 2.5% steps to
achieve from +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling using the I2C DVS register.
An extra fine voltage scaling in 0.5% steps helps to adjust
down the output voltage as low as -XX%.
Uses a bootstrap network with an internal diode to power
its switch MOSFET
All gate drive circuits are supplied from VG.
Uses integrated compensation.
The output is monitored for under-voltage and over-
voltage conditions
The output is monitored for over-current and short-circuit
conditions
The regulator is monitored for over-temperature
conditions
Operation Modes
The switcher will be active when:
VG is in regulation AND
There is no GrpB shutdown command through the I2C
interface AND
No faults exist that would cause GrpB to shut down
REG4
This is a 4-switch synchronous buck-boost PWM voltage-
mode control DC/DC regulator.
See Power-Up Sequence on page 27 for more details on
when REG4 is powered up in the sequence.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT4 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
Characteristics
It powers up directly from the battery
Operates at a switching frequency equals to FSW1
Drives integrated low RDS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
The output is ±2% accuracy
Output voltage is adjustable by means of an external
resistor divider
The output can be adjusted up or down at 2.5% steps for
a total of +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling.
Uses bootstrap networks with an internal diode to power
its high side MOSFETs
All gate drive circuits are supplied from VG.
Uses external compensation
The output is monitored for under-voltage and over-
voltage conditions
The output is monitored for over-current and short-circuit
conditions
The regulator is monitored for over-temperature
conditions
Operation Modes
The switcher will be active when:
VG is in regulation AND
There is no GrpB shutdown command through the I2C
interface AND
No faults exist that would cause GrpB to shut down
REG5
This is a 4-switch synchronous buck-boost PWM voltage-
mode control DC/DC regulator.
See Power-Up Sequence on page 27 on for more details
on when REG5 is powered up in the sequence.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT5 will be discharged every time the regulator is
shutting down and it will be held low by the discharge FET as
long as possible.
Characteristics
It powers up directly from the battery
Operates at a switching frequency equals to FSW1
Drives integrated low RDS(ON) N-channel power
MOSFETs (NHV_HC) as its output stage
The output is ±2% accuracy
Output voltage is adjustable by means of an external
resistor divider
The output can be adjusted up or down at 2.5% steps for
a total of +17.5% to -20.0% on each direction allowing
Dynamic Voltage Scaling.
Uses bootstrap networks with an internal diodes to power
its high side MOSFETs
All gate drive circuits are supplied from VG.
Uses external compensation
The output is monitored for under-voltage and over-
voltage conditions
The output is monitored for over-current and short-circuit
conditions
The regulator is monitored for over-temperature conditions
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