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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)： | 17/50頁 |
| 文件大?。?/td> | 2010K |
| 代理商： | PC34704BEP |
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Analog Integrated Circuit Device Data
24
Freescale Semiconductor
34704
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Operation Modes
The switcher will be active when:
VG is in regulation AND
There is no GrpC (OR GrpE) shutdown command through
the I2C interface AND
No faults exist that would cause GrpC (OR GrpE) to shut
down
REG6 (Only 34704A)
This is a synchronous boost PWM voltage-mode control
DC/DC regulator.
See Power-Up Sequence on page 27 for more details on
when REG6 is powered up in the sequence.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT6 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 FSW2
Drives integrated low RDS(ON) N-channel power
MOSFETs (NVHV_LC) as its output stage
It offers load disconnect from the input battery when the
output is off (True Cut-Off)
The output is ±4% accuracy
Output voltage is adjustable by means of an internal
resistor divider
The output can be adjusted up or down at 2.5% steps for
a total of 10% on each direction allowing Dynamic Voltage
Scaling
Uses a bootstrap network with an internal diode to power
its synchronous 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 GrpC shutdown command through the I2C
interface AND
REG7 (Only 34704A)
This is a none-synchronous buck-boost inverting PWM
voltage-mode control DC/DC regulator.
See Power-Up Sequence on page 27 for more details on
when REG7 is powered up in the sequence.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT7 will be discharged every time the regulator is
shutting down and it will be held high to ground by the
discharge FET as long as possible.
Characteristics
It powers up directly from the battery
Operates at a switching frequency equals to FSW2
Drives an external P-channel power MOSFET
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 10% on each direction allowing Dynamic Voltage
Scaling.
All gate drive circuits are supplied from VG
Uses external compensation, the type is up to the designer
The output is monitored for under-voltage and over-
voltage conditions
Operation Modes
The switcher will be active when:
VG is in regulation AND
There is no GrpC shutdown command through the I2C
interface AND
No faults exist that would cause GrpC to shut down
REG8
This is a synchronous boost PWM voltage-mode control
DC/DC regulator.
See Power-Up Sequence on page 27 for more details on
when REG8 is powered up in the sequence.
VOUT8 will be discharged every time the regulator is
shutting down and it will be held to ground by the discharge
FET as long as possible.
This regulator offers either voltage regulation for organic
LEDs or current regulation for LCD backlighting LEDs. It
provides either voltage or current feedback for these
purposes through the same feedback pin.
The regulator cannot drive only 1LED with a forward
voltage drop of less than the battery input voltage.
The processor would set the REG8 register through I2C
before enabling REG8 to indicate if voltage regulation or
current regulation will be used.
Characteristics
It powers up directly from the battery
Operates at a switching frequency equals to FSW2
Drives integrated low RDS(ON) N-channel power
MOSFETs (NVHV_LC) as its output stage
It offers load disconnect from the input battery when the
output is off (True Cut-Off)
The output is ±4% accuracy
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