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ADP3209 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer ADP3209
Beschreibung Synchronous Buck Controller
Hersteller ON Semiconductor
Logo ON Semiconductor Logo 




Gesamt 30 Seiten
ADP3209 Datasheet, Funktion
5-Bit, Programmable, Single-Phase,
Synchronous Buck Controller
ADP3209
FEATURES
GENERAL DESCRIPTION
Single-chip solution
Fully compatible with the Intel® GMCH chipset voltage
regulator specifications
Integrated MOSFET drivers
±8 mV worst-case differentially sensed core voltage error
over temperature
Automatic power-saving modes maximize efficiency during
light load operation
Soft transient control reduces inrush current and audio noise
Independent current limit and load line setting inputs for
additional design flexibility
Built-in power-good masking supports
voltage identification (VID) on-the-fly transients
5-bit, digitally programmable DAC with 0.4 V to 1.25 V output
Short-circuit protection with programmable latch-off delay
Output power or current monitor options
32-lead LFCSP
APPLICATIONS
Notebook power supplies for next-generation Intel chipsets
The ADP3209 is a highly efficient, single-phase, synchronous
buck switching regulator controller. With its integrated drivers,
the ADP3209 is optimized for converting the notebook battery
voltage to render the supply voltage required by high performance
Intel chipsets. An internal 5-bit DAC is used to read a VID code
directly from the chipset and to set the GMCH core voltage to a
value within the range of 0.4 V to 1.25 V.
The ADP3209 uses a multimode architecture. It provides program-
mable switching frequency that can be optimized for efficiency
depending on the output current requirement. In addition, the
ADP3209 includes a programmable load line slope function to
adjust the output voltage as a function of the load current so that
the core voltage is always optimally positioned for a load transient.
The ADP3209 also provides accurate and reliable current overload
protection and a delayed power-good output. The IC supports
on-the-fly output voltage changes requested by the chipset.
The ADP3209 is specified over the extended commercial tempera-
ture range of 0°C to 100°C and is available in a 32-lead LFCSP.
FUNCTIONAL BLOCK DIAGRAM
RAMP VRPM RPM RT
VID4
VID3
VID2
VID1
VID0
ST
VARFREQ
SS
PWRGD
EN
VCC
GND
RAMP
GENER-
ATOR
OSCILLATOR
PWM
CMPS
PWM
LATCH
PHASE
CONTROL
VREF
SWITCH
AMPS
VID VDAC REFERENCE
DAC
SELECT
DRV
IN
ODB
ODA
+
–+
ERR AMP
++–– SS
FBRTN
CSAMP –
+
CLREF
HOUSE-
KEEPING
CLTHSEL
CLIM
CMP
+
+–
+–
REFTH BIAS
UVLO
REF
BIAS
VREF
ADP3209
PMON
PWM
CSAVG
+
BST
DRVH
SW
PVCC
DRVL
PGND
COMP
FB
LLINE
CSFB
CSREF
CSCOMP
CLIM
FBRTN
PMON PMONFS
Figure 1.
©2008 SCILLC. All rights reserved.
January 2008 – Rev. 2
Publication Order Number:
ADP3209/D






ADP3209 Datasheet, Funktion
ADP3209
TIMING DIAGRAM
Timing is referenced to the 90% and 10% points, unless otherwise noted.
IN
DRVL
tpdlDRVL
tfDRVL
tpdlDRVH
trDRVL
DRVH
(WITH RESPECT
TO SW)
SW
tpdhDRVH trDRVH
VTH
Figure 2. Timing Diagram
tfDRVH
VTH
tpdhDRVL
1V
Rev. 2 | Page 6 of 32 | www.onsemi.com

6 Page









ADP3209 pdf, datenblatt
ADP3209
4
OUTPUT VOLTAGE
SWITCH NODE
2
LOAD CURRENT
1
CH1 100mV
CH2 10.0V~
CH4 20.0mV
M2.00—s A CH1 120mV
T 20.00%
Figure 16. Load Transient, 2 A to 10 A, VIN = 19 V
4
OUTPUT VOLTAGE
VID 0
1
CH1 1.00V
CH4 100mV
M40.0—s A CH1 600mV
T 20.00%
Figure 17. VID on the Fly, 1.25 V to 0.825 V
4
OUTPUT VOLTAGE
M2.00—s A CH4 9.20mV
CH4 20.0mV~ T 10.00%
Figure 18. Output Ripple, 15 A Load, CX = 470 µF, CZ = 44 µF
Rev. 2 | Page 12 of 32 | www.onsemi.com

12 Page





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