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ADP3207 Datasheet(PDF) 8 Page - ON Semiconductor

Part No. ADP3207
Description  CPU Synchronous Buck Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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ADP3207 Datasheet(HTML) 8 Page - ON Semiconductor

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ADP3207
Rev. 1 | Page 8 of 29 | www.onsemi.com
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
10
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1
21
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ADP3207
TOP VIEW
(Not to Scale)
EN
PWRGD
PGDELAY
FBRTN
FB
COMP
SS
STSET
DPRSLP
CLKEN
TTSENSE
VRTT
DCM
PWM2
PWM3
SW1
SW2
SW3
PWM1
OD
PIN 1
INDICATOR
Figure 5. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
EN
Power Supply Enable Input. Pulling this pin to GND disables the PWM outputs and pulls the PWRGD output low.
2
PWRGD
Power-Good Output. Open drain output that signals when the output voltage is outside of the proper operating
range. The pull-high voltage on this pin cannot be higher than VCC.
3
PGDELAY
Power-Good Delay Setting Input. A capacitor between this pin and GND sets the power-good delay time.
4
CLKEN
Clock Enable Output. The pull-high voltage on this pin cannot be higher than VCC.
5
FBRTN
Feedback Return. VID DAC and error amplifier reference for remote sensing of the output voltage.
6
FB
Feedback Input. Error amplifier input for remote sensing of the output voltage.
7
COMP
Error Amplifier Output and Compensation Point.
8
SS
Soft-Start Delay Setting Input. An external capacitor connected between this pin and GND sets the soft-start
ramp-up time and the current-limit latch-off delay time.
9
STSET
Soft Transient Slew Rate Timing Input. A capacitor from this pin to GND sets the slew rate of the output voltage
when transitioning between the boot voltage and the programmed VID voltage, and when transitioning
between active mode and deeper sleep mode.
10
DPRSLP
Deeper Sleep Control Input.
11
ILIMIT
Current-Limit Setpoint. An external resistor from this pin to GND sets the current-limit threshold of the converter.
12
VRPM
RPM Mode Reference Voltage Output.
13
RRPM
RPM Mode Timing Control Input. A resistor between this pin and VRPM sets the RPM mode turn-on threshold voltage.
14
RT
Multiphase Frequency Setting Input. An external resistor connected between this pin and GND sets the oscillator
frequency of the device when operating in multiphase PWM mode.
15
RAMPADJ
PWM Ramp Current Input. An external resistor from the converter input voltage to this pin sets the internal PWM
ramp.
16
LLSET
Output Load Line Programming Input. The center point of a resistor divider between CSREF and CSCOMP is
connected to this pin to set the load line slope.
17
CSREF
Current-Sense Reference Voltage Input. The voltage on this pin is used as the reference for the current-sense
amplifier and the power-good and crowbar functions. This pin should be connected to the common point of the
output inductors.
18
CSSUM
Current-Sense Summing Node. External resistors from each switch node to this pin sum the inductor currents
together to measure the total output current.
19
CSCOMP
Current-Sense Compensation Point. A resistor and capacitor from this pin to CSSUM determine the gain of the
current-sense amplifier and the positioning loop response time.
20
GND
Ground. All internal biasing and the logic output signals of the device are referenced to this ground.


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