參數(shù)資料
型號(hào)： 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(yè)數(shù)： 15/50頁(yè)
文件大小： 2010K
代理商： PC34704BEP
Analog Integrated Circuit Device Data
22
Freescale Semiconductor
34704
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
REGUALATOR OVERVIEW WITH EFFICIENCY ANALYSIS
REG1 (34704A Only)
REG1 is a synchronous boost PWM voltage-mode control
DC/DC regulator available only in the 34704A. Even though
REG1 is a synchronous regulator, it is recommended to have
a diode connected externally across its synchronous
MOSFET. When the battery voltage is above REG1’s output
(>5.0V) as the case might be when connected to the USB
supply or wall adaptor, the REG1 power MOSFETs will be tri-
stated and the voltage on the output will be Battery minus the
diode drop. This will help maintain REG1’s output to a
maximum of 5.2V and not allow it to drift all the way to 5.5V.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
On the 34704A, when the appropriate command is
received from the processor to turn on VOUT1, then the
isolation FET of REG1 would turn on gradually to avoid any
inrush current out of VG and to ramp the VOUT1 voltage in a
controlled manner.
REG1 VOUT1 will be discharged every time GrpA 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
It offers load disconnect from the input battery when the
output is off (True Cutoff)
The output is ±4% accuracy
Output voltage is set to 5.0V by means of an internal
resistor divider
The output can be adjusted up or down at 2.5% 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 REG1’s own VG
output.
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 VG output is always active as long as:
The IC is not in an under-voltage lockout AND
No shutdown signal through the ONOFF pin is present
AND
There is no ALLOFF shutdown command through the I2C
interface AND
No faults exist that would cause the 34704 to shutdown
The VOUT1 output will be active when:
VG output is available AND
There is no GrpA shutdown command through the I2C
interface AND
No faults exist that would cause the VOUT1 to shut down
REG2
This is a 4-switch synchronous buck-boost PWM voltage-
mode control DC/DC regulator.
when REG2 is powered up in the sequence.
The switcher will operate in DCM at very light loads to
allow pulse skipping.
VOUT2 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
REG3
This is a synchronous buck PWM voltage-mode control
DC/DC regulator.
when REG3 is powered up in the sequence.
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