SC900841JVKR2 Freescale Semiconductor, SC900841JVKR2 Datasheet - Page 69

• Manufacturer Part Number: SC900841JVKR2
• Description: IC POWER MGT 338-MAPBGA
• Manufacturer: Freescale Semiconductor

Specifications of SC900841JVKR2

• Applications: PC's, PDA's
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 338-TBGA
• Input Voltage: 2.8 V to 4.4 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

input voltage range beyond the 3.0 to 4.4 V applications
range. Under this extended range, functionality is
maintained, but parametric performance might be
compromised.
VCC
synchronous Buck PWM voltage mode control DC/DC
regulator, designed to power high performance CPUs. VCC
uses external MOSFETs, P-Ch high side and N-Ch low side.
requirements. A 7-bit DAC reads the VID input signals and
sets the output voltage level. The output voltage has a range
of 0.3 to 1.2 V. The programming step size is 12.5 mV.
Values will be read in real time and will be stored in internal
registers not accessible to the system host. Reference
VIDEN[1:0] & VID[6:0] Pins
VNN, where a latch signal for each regulator decides which
regulator takes control of the VID input signals.
output voltage node is connected directly to the inverting
input of the error amplifier that uses the DAC output as its
reference, unity gain configuration. Using this configuration
with internal compensation eliminates the need for the
feedback and compensation network, which saves board
space and cost. The DAC/output voltage slew rate is
Main Features
• Uses the V
• It is used to provide power to the CPU Core.
• Single-Phase Solution with Integrated Drivers and
Analog Integrated Circuit Device Data
Freescale Semiconductor
Note that all of the DC/DC regulators specify an extended
This is a VID controlled single-phase 1.0 MHz 2-switch
VCC includes support for VID active voltage positioning
The same VID input signals are shared between VCC and
The DAC value represents the output voltage value. The
external MOSFETs
PWR
V
C
CC
OCC
rail as its power supply
C
L
INCC
V
CC
for more details.
PWR
M
M
Figure 23. VCC Detailed Internal Block Diagram
GNDREFVCC
HSCC
LSCC
VOUTFBCC
SWFBCC
HSCCGT
PGNDCC
PVINCC
LSCCGT
CSPCC
Current Sense
Internal
Compensation
Driver
Z1
Amp
I
CC
EA
internally set 25 mV/µs to minimize transient currents and
audible noise.
the load conditions. These modes can be set through the SPI
and include a PFM mode, an Automatic Pulse Skipping
mode, and a PWM mode. The above selection is optimized
to maximum battery life based on load conditions.
down.
implementation of the DCR sensing method using internal
sensing circuitry, which eliminates the need for an external
RC filter network in parallel with the output inductor and its
winding resistance.
filters are matching by insuring that R*C = L/R
voltage across the capacitor is equal to the value of the
voltage across the winding resistance R
Based on this, the voltage across the capacitor is measured,
and with a known R
extracted. The measured current value will be digitized by the
ADC and stored in a register for the processor to access. The
method used on the 900841 measures the voltage across R
in a similar fashion, while using internal sensing circuitry.
current protection. If an over-current condition is detected,
the regulator will limit the current through cycle by cycle
operation, and alert the system through the VCCFAULT
signal, which will in turn assert the VRFAULT Interrupt signal.
• VID Controlled for dynamic voltage scaling requirements
• 1.0 MHz switching frequency
• High efficiency operating modes depending on load
• Output can be discharged through the low side switch.
Z2
Controller
The switcher can operate in different modes depending on
VCC will be discharged every time the regulator is shutting
The output current will be sensed using an intelligent
DCR sensing theory is that if the impedance of the two
The sensed output current value will also be used for over-
of high performance processors
conditions
DAC
W
AOACCTLVCC
value, the load current can be
VCCFAULT
CTLVCC
VIDEN0
VIDEN1
FUNCTIONAL DEVICE OPERATION
V
REF
Interface
SPI
W
, V
POWER SUPPLIES
CAP
W
, then the
= I
LOAD
900841
*R
W
69
W
.