KIT33730EKEVBE Freescale Semiconductor, KIT33730EKEVBE Datasheet - Page 15

• Manufacturer Part Number: KIT33730EKEVBE
• Description: Power Management Modules & Development Tools SWITCH MODE PWR SUP
• Manufacturer: Freescale Semiconductor
• Type: Linear Regulators - Standardr

Specifications of KIT33730EKEVBE

• Product: Power Management Modules
• Silicon Manufacturer: Freescale
• Silicon Core Number: MC33730
• Kit Application Type: Power Management
• Application Sub Type: SMPS
• Kit Contents: Board, CD
• Rohs Compliant: Yes
• For Use With/related Products: MC33730
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

INTRODUCTION
supply input for the standby regulators V
V
The VBAT pin is the power input of the integrated buck
regulator, which steps-down the protected battery voltage
providing directly the 5.0 V system supply V
provides power for the main linear regulator(s) V
and also for the other module circuits requiring 5.0 V supply
voltage (e.g. protected V
nominal level, the 33730 will start at the latest when the
supply (battery) voltage reaches V
If the supply voltage ramps down, the 33730 will keep
operating (with degradation of the output voltage regulation)
down to
operational down to
standby mode. In the Standby (sleep) mode of operation the
IC will draw maximum I
the VKAM is used as a standby output, and it is unloaded.
When V
quiescent current increases by approximately another
100 μA.
POWER UP
simultaneously (hot plugged) or in the random sequence to
the KA_VBAT, VBAT and VIGN (or REGON) inputs.
POWER DOWN
disconnected from any of the KA_VBAT, VBAT inputs or
when control signals the VIGN or REGON inputs go low.
UNDERVOLTAGE LOCK-OUT (UVLO)
into the IC. When the battery voltage at the KA_VBAT pin
falls below
power down sequence for the whole IC. The under-voltage
lock-out circuit has a
filter in order to prevent spurious tripping its threshold level
and consequent system oscillations between the ON and
OFF states.
SWITCHING REGULATOR
(externally adjustable) PWM voltage mode controller with
integrated low-R
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:
Analog Integrated Circuit Device Data
Freescale Semiconductor
DD3_SBY,
The 33730 has two supply inputs. The KA_VBAT pin is the
If the supply voltage ramps from zero volts up to its
The 33730 will operate in systems with and without
The 33730 will safely power up when the power is applied
The 33730 will safely power down when the power is
There is an under-voltage lock-out feature implemented
The 33730 switching regulator is a fixed frequency
DD3
V
UVLO_f
see
V
UVLO_f
is used as an additional standby output the
Table
at the KA_VBAT pin. The V
DS(ON)
the under-voltage comparator initiates the
V
6) and for the internal supply circuits.
V
UVLO_f
UVLO_hys
Q
N-channel power MOSFET. This
REF1,2
quiescent current, assuming only
at the KA_VBAT pin.
outputs).
hysteresis and 5.0 μs glitch
STUP
FUNCTIONAL DEVICE OPERATION
at the KA_V
KAM
KAM
DDH
(and optionally
OPERATION DESCRIPTION
. V
output stays
DDL
DDH
BAT
, V
DD3
pin.
,
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 R
pin to ground (see
the right switching frequency, optimization of the system for
EMC performance.
switching regulator off when the input voltage exceeds the
V
the severe load dump conditions up to max V
MOSFET gate when the switching regulator reaches 100%
duty cycle during the low battery conditions.
to provide 5.0 V @ 2.0 A with ±2% accuracy and it is intended
to directly power the digital and analog circuits of the
Electronic Control Module (ECM). The switching regulator
Figure 4. Switching Regulator Frequency vs. R
SHDN_r
Adjustable Switching Frequency
The adjustable frequency feature provides the ability to
Adjustable Slew-rate
The adjustable slew-rate option allows, with selection of
Over-voltage Lock-Out (Shutdown)
The over-voltage lock-out (shutdown) feature turns the
Operation at 100% Duty Cycle
The internal charge pump is used to enhance the power
The switching regulator output voltage V
F
F
R
SW
SW i
FREQ
600
500
400
300
200
100
limit. This extends the 33730 capability to survive
≅ 18.48 + (5098.7/R
s the switch frequency in kHz
0
0
is the resistor value in kOhms
Figure
20
Frequency vs R
4).
FUNCTIONAL DEVICE OPERATION
40
R
FREQ
Freq
F
[kohm ]
connected from the FREQ
OPERATION DESCRIPTION
)
Freq
60
DDH
80
BAT
is regulated
.
Freq
100
Value
33730
15