ADP3208C ON Semiconductor, ADP3208C Datasheet - Page 11
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ADP3208C
Manufacturer Part Number
ADP3208C
Description
7-bit,programmable,dual- Phase,mobile,cpu,synchronous Buck Controller
Manufacturer
ON Semiconductor
Datasheet
1.ADP3208C.pdf
(41 pages)
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 3. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Mnemonic
EN
PWRGD
NC
CLKEN
FBRTN
FB
COMP
NC
IRPM
VARFREQ
VRTT
TTSNS
IMON
RPM
IREF
Description
Enable Input. Driving this pin low shuts down the chip, disables the driver outputs, pulls PWRGD
and VRTT low, and pulls CLKEN high.
Power-Good Output. Open-drain output. A low logic state means that the output voltage is outside
of the VID DAC defined range.
Not Connected.
Clock Enable Output. Open-drain output. A low logic state enables the CPU internal PLL clock to
lock to the external clock.
Feedback Return Input/Output. This pin remotely senses the CPU core voltage. It is also used as the
ground return for the VID DAC and the voltage error amplifier blocks.
Voltage Error Amplifier Feedback Input. The inverting input of the voltage error amplifier.
Voltage Error Amplifier Output and Frequency Compensation Point.
Not Connected.
RPM Mode Timing Control Input. A resistor between this pin or RPM pin to ground sets the RPM mode
turn-on threshold voltage. If a resistor is connected between this pin to ground, RPM pin must remain
floating.
Variable Frequency Enable Input. A high logic state enables the PWM clock frequency to vary with
VID code.
Voltage Regulator Thermal Throttling Output. Logic high state indicates that the voltage regulator
temperature at the remote sensing point exceeded a set alarm threshold level.
Thermal Throttling Sense and Crowbar Disable Input. A resistor divider where the upper resistor is
connected to VCC, the lower resistor (NTC thermistor) is connected to GND, and the center point is
connected to this pin and acts as a temperature sensor half bridge. Connecting TTSNS to GND disables
the thermal throttling function and disables the crowbar, or overvoltage protection (OVP), feature
of the chip.
Current Monitor Output. This pin sources a current proportional to the output load current. A
resistor to FBRTN sets the current monitor gain.
RPM Mode Timing Control Input. A resistor between this pin or IRPM pin to ground sets the RPM mode
turn-on threshold voltage. If a resistor is connected between this pin to ground, IRPM pin must remain
floating.
This pin sets the internal bias currents. A 80kOhm resistor is connected from this pin to ground.
VARFREQ
PWRGD
CLKEN
FBRTN
COMP
TTSNS
IRPM
VRTT
NC
NC
EN
FB
Rev. 1 | Page 11 of 41 | www.onsemi.com
Figure 3. LFCSP Pin Configuration
1
ADP3208C
(top view)
PGND1
BST1
DRVH1
SW1
PVCC1
DRVL1
PGND2
DRVL2
PVCC2
SW2
DRVH2
BST2
ADP3208C