ADP3210 Datasheet, PDF (1/38 Pages) ON Semiconductor – 7-Bit Programmable Multiphase Mobile CPU Synchronous

FEATURES
1-, 2-, or 3-phase operation at up to 1 MHz per phase
Input Voltage Range of 3.3 V to 22 V
±8 mV worst-case differential sensing error over
temperature
Interleaved PWM outputs for driving external high power
MOSFET drivers
Automatic power-saving modes maximize efficiency during
light load and deeper sleep operation
Active current balancing between output phases
Independent current limit and load line setting inputs for
additional design flexibility
7-bit digitally programmable 0 V to 1.5 V output
Overload and short-circuit protection with latch-off delay
Built-in clock enable output for delaying CPU clock
synchronization until CPU supply voltage stabilizes
Output Current Monitor
APPLICATIONS
Notebook power supplies for next generation Intel®
processors
GENERAL DESCRIPTION
The ADP3210 is a high efficiency, multiphase, synchronous,
buck-switching regulator controller optimized for converting
notebook battery voltage into the core supply voltage of high
performance Intel processors. The part uses an internal 7-bit
DAC to read voltage identification (VID) code directly from the
processor that sets the output voltage. The phase relationship of
the output signals can be configured for 1-, 2-, or 3-phase
operation, with interleaved switching.
The ADP3210 uses a multimode architecture¹ to drive the logic-
level PWM outputs at a switching frequency selected by the
user depending on the output current requirement. The part
switches between multiphase and single-phase operation according
to a system signal provided by the CPU. Shedding phases as
function of the load maximizes power conversion efficiency under
different load conditions. In addition, the ADP3210 supports
programmable loadline resistance adjustment. As a result, the
7-Bit Programmable
Multiphase Mobile
CPU Synchronous
ADP3210
output voltage is always optimally positioned for a load transient.
Patent 6,683,441.
FUNCTIONAL BLOCK DIAGRAM
GND
VCC EN
RPM RT RAMP
TRDET
COMP
FB
LLINE
PSI
TRDET
Generator
UVLO
Shutdown
and Bias
REF
VEA
-
+
Σ
+
+ _CSREF
+^{Σ _}
OVP
1.55V
Oscillator
Current
Balancing
Circuit
Driver
Logic
DPRSLP
DAC + 200mV
-
CSREF
+
PSI and
DPRSLP
Logic
-
+
DAC - 300mV
PWRGD
PWRGD
Open
Drain
PWRGD
Start Up
Delay
CLKEN
FBRTN
CLKEN
Open
Drain
Precision
Reference
CLKEN
Start Up
Delay
Current
Limit
Circuit
Soft
Transient
Delay
Delay
Disable
VID
DAC
DAC
OCP
Shutdown
Delay
Current
Monitor
+
-
Thermal
Throttle
Control
Soft Start
and Soft
Transient
Control
REF
PWM1
PWM2
PWM3
DCM1
OD
SW1
SW2
SW3
IMON
CSREF
CSSUM
CSCOMP
ILIM
TTSENSE
VRTT
Figure 1.
The chip also provides accurate and reliable short-circuit
protection with adjustable current limit threshold and a delayed
power-good output that is masked during on-the-fly output
voltage changes to eliminate false alarm.
The ADP3210 performance is specified over the extended
commercial temperature range of -10°C to 100°C. The chip is
available in a 40-lead QFN package.
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