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ADP3203 Datasheet(PDF) 6 Page - Analog Devices

Part No. ADP3203
Description  2-Phase IMVP-II & IMVP-III Core Controller for Mobile CPUs
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ADP3203 Datasheet(HTML) 6 Page - Analog Devices

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REV. PrD
–6–
PRELIMINARY TECHNICAL DATA
12
PWRGD
Power Good (active high). This is an open drain output pin which, via the assistance of an
external pull-up resistor to the desired voltage, indicates that the core voltage is within the
specified tolerance of the VID programmed value or else in a VID transition state as indicated
by a recent state transition of either the
BOM or DPRSLP pins. PWRGD is deactivated
(pulled low) when the IC is disabled or in UVLO mode or starting up, or the COREFB
voltage is out of the core powergood window. The open drain output allows external wired
ANDing (logical NORing) with other open drain/collector power-good indicators.
13
SD
Shutdown (active low). This is a digital input pin coming from a system signal which, in its
active state, shuts down the IC operation, placing the IC in its lowest quiescent current state
for maximum power savings.
14
CLAMP
Clamp (active high). This is an open drain output pin which, via the assistance of an external
pull-up resistor, indicates that the core voltage should be clamped for its protection. To allow
the highest level of protection, the CLAMP signal is developed using both a redundant
reference and a redundant feedback path with respect to those of the main regulation loop.
The signal is timed out using the softstart capacitor, so an external current protection
mechanism (e.g., fuse or AC adapter's current limit) should be tripped within ~3 times the
programmed soft start time (e.g. 5~10 ms). In a preferred and more conservative configura-
tion, the core voltage is clamped by an external FET. The initial protection function is served
when it is activated by detection of either an over-voltage or a reverse-voltage condition on the
COREFB pin. A backup protection function due to loss of the latched signal at IC power-off
is served by connecting the pull-up resistor to a system "ALWAYS" regulator output (e.g.,
V5_ALWAYS). If the external FET is used, this implementation will keep the core voltage
clamped until the ADP3422 has power re-applied, thus keeping protection for the CPU even
after a hard-failure power-down and restart (e.g., a shorted top or bottom FET).
15
DRVLSD
Drive-Low Shutdown (active low). This is a digital output pin which, in its active state,
indicates that the lower FET of the core VR should be disabled. In the suggested application
schematic this pin is directly connected to the pin of the same name on the ADP3415 or other
driver IC. Drive-low shutdown is normally activated by the DPRSLP signal, corresponding to
a light load condition, but a number of dynamic conditions can override the control of this pin
as needed.
16
SS
Soft Start. This is an analog I/O pin whose output is a controlled current source used to
charge or discharge an external grounded capacitor and whose input is the detected voltage
that is indicative of elapsed time. The pin controls the soft start time of the IC as well as the
hiccup cycle time during overload including but not limited to short circuit, over voltage, and
reverse voltage. Hiccup operation is a feature that was added to reduce short circuit power
dissipation by more than an order of magnitude, while still allowing an automatic restart when
the failure mode ceased. The hiccup operation can be overwritten and changed to latched-off
operation by clamping the SS pin voltage to a voltage level somewhere above ~ 0.2 V. In this
configuration, the controller does not restart after a hiccup cycle is initiated, but stays latched
off.
17
COREFB
Core Feedback. This is a high-impedance analog input pin that is used to monitor the output
voltage for setting the proper state of the PWRGD and CLAMP pins. It is generally recom-
mended to RC-filter the ripple and noise from the monitored core voltage, as suggested by the
application schematic.
18
DACOUT
Digital-to-Analog Converter Output. This output voltage is the VID-controlled reference
voltage whose primary function is to determine the output voltage regulation point.
19
GND
Ground.
20
OUT1
Output to Driver 1. This is a digital output pin which is used to command the state of the
switched node via the driver and MOSFET switches. It should be connected to the IN pin of
the ADP3415 driver that corresponds to the first of two channels.
Pin
Mnemonic
Function
ADP3203


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