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參數(shù)資料
| 型號(hào)： | PC33730EK/R2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO32 |
| 封裝： | 0.65 MM PITCH, ROHS COMPLIANT, SOIC-32 |
| 文件頁數(shù)： | 8/27頁 |
| 文件大小： | 716K |
| 代理商： | PC33730EK/R2 |
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Analog Integrated Circuit Device Data
16
Freescale Semiconductor
33730
FUNCTIONAL DEVICE OPERATION
OPERATION DESCRIPTION
FUNCTIONAL DEVICE OPERATION
OPERATION DESCRIPTION
INTRODUCTION
The 33730 has two supply inputs. The KA_VBAT pin is the
supply input for the standby regulators VKAM (and optionally
The VBAT pin is the power input of the integrated buck
regulator, which steps-down the protected battery voltage
providing directly the 5.0V system supply VDDH. VDDH
provides power for the main linear regulator(s) VDDL, VDD3,
and also for the other module circuits requiring 5.0V supply
voltage (e.g. protected VREF1,2 outputs).
If the supply voltage ramps from zero volts up to its
nominal level the 33730 will start up the latest when the
supply (battery) voltage reaches 4.4V at the KA_VBAT pin. If
the supply voltage ramps down and the 33730 will keep
operating (with degradation of the output voltage regulation)
down to 4.3V (max.) at the KA_VBAT pin. The VKAM output
stays operational down to 3.5V at the KA_VBAT pin.
The 33730 will operate in both systems with and without
standby mode. In the Standby (sleep) mode of operation the
IC will draw maximum 350
μA quiescent current, assuming
only the VKAM is used as a standby output, and it is
unloaded. When VDD3 is used as an additional standby
output the quiescent current increases by approximately
another 100
μA.
POWER UP
The 33730 will safely power up when the power is applied
simultaneously (hot plugged) or in the random sequence to
the KA_VBAT, VBAT and VIGN (or REGON) inputs.
POWER DOWN
The 33730 will safely power down when the power is
disconnected from any of the KA_VBAT, VBAT inputs or
when control signals the VIGN or REGON inputs go low.
UNDERVOLTAGE LOCK-OUT (UVLO)
There is an under-voltage lock-out feature implemented
into the IC. When the battery voltage at the KA_VBAT pin
falls below 4.0V (typ.) the under-voltage comparator initiates
the power down sequence for the whole IC. The under-
voltage lock-out circuit has a 100mV hysteresis and 5.0
μs
glitch filter in order to prevent spurious tripping its threshold
level and consequent system oscillations between the ON
and OFF states.
SWITCHING REGULATOR
The 33730 switching regulator is a fixed frequency
(externally adjustable) PWM voltage mode controller with
integrated low-RDS(ON) N-channel power MOSFET. This
architecture is widely flexible and provides a possibility to
optimize its operation over a wide range of input voltages.
The 33730 switching regulator provide the following features:
Adjustable Switching Frequency
The adjustable frequency feature provides the ability to
modify the switcher performance for optimized cost (higher
frequency, smaller, cheaper components) or higher efficiency
and better EMC performance (lower switching frequency for
reduced losses and EMI). The operating frequency of the
switching regulator can be adjusted by means of an external
resistor RF connected from the FREQ pin to ground (see
Figure 4. Switching Regulator Frequency vs. RFreq
Value.
Adjustable Slew-rate
The adjustable slew-rate option allows, with selection of
the right switching frequency, optimization of the system for
EMC performance.
Over-voltage Lock-Out (Shut-Down)
The over-voltage lock-out (shut-down) feature turns the
switching regulator off when the input voltage exceeds the
VSHDN_r limit. This extends the 33730 capability to survive
the severe load dump conditions up to max VBATT.
Operation at 100% Duty Cycle
The internal charge pump is used to enhance the power
MOSFET gate when the switching regulator reaches 100%
duty cycle during the low battery conditions.
The switching regulator output voltage VDDH is regulated
to provide 5.0V @ 2.0A with ±2% accuracy and it is intended
to directly power the digital and analog circuits of the
Electronic Control Module (ECM). The switching regulator
output current is also used by the following linear regulators
VDD3_3, VDDL, and sensor supplies VREF1, and VREF2.
Frequency vs R
Freq
0
100
200
300
400
500
600
0
2040
6080
100
R
Freq [k ohm ]
S
w
it
ch
in
g
F
req
u
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n
cy
[
k
H
z
]
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