ADP3170JRU Analog Devices, ADP3170JRU Datasheet - Page 4

• Manufacturer Part Number: ADP3170JRU
• Description: VRM 8.5 Compatible Single Phase Core Controller
• Manufacturer: Analog Devices

ADP3170
Pin No.
1–5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Mnemonic
VID3, VID2,
VID1, VID0,
VID25
PWRGD
REF
SD
FB
CS–
CS+
CT
COMP
LRDRV
LRFB
VCC
DRVL
DRVH
PGND
GND
Function
Voltage Identification DAC Inputs. These pins are pulled up to an internal reference,
providing a logic one if left open. The DAC output programs the FB regulation voltage from
1.05 V to 1.825 V.
Open drain output that signals when the output voltage is in the proper operating range.
3.0 V Reference Output.
Regulator Shutdown. Pulling this pin high turns off both MOSFETs of the switching
regulator. SD has no effect on the linear regulator controller.
Feedback Input. Error amplifier input for remote sensing of the output voltage.
Current Sense Negative Node. Negative input for the current comparator.
Current Sense Positive Node. Positive input for the current comparator. The output current is
sensed as a voltage at this pin with respect to CS–.
External capacitor connected from CT to ground sets the OFF-Time of the device.
Error Amplifier Output and Compensation Point. The voltage at this output programs the
output current control level between CS+ and CS–.
Gate Drive for the 1.8 V linear regulator N-channel MOSFET.
Feedback Connections for the 1.8 V linear regulator controller.
Supply Voltage for the ADP3170.
Low-Side MOSFET Drive. Gate drive for the synchronous rectifier N-channel MOSFET.
The voltage at DRVL swings from GND to VCC.
High-Side MOSFET Drive. Gate drive for the buck switch N-channel MOSFET. The voltage
at DRVH swings from GND to VCC.
Power Ground. PGND should have a low impedance path to the source of the synchronous
MOSFET.
Small-Signal Ground. This ground reference can be used in conjunction with FB to provide
remote sensing of the output voltage at the CPU pins.
PIN FUNCTION DESCRIPTIONS
PWRGD
PIN CONFIGURATION
VID25
VID3
VID2
VID1
VID0
REF
CS–
SD
FB
10
1
2
3
4
5
6
7
8
9
(Not to Scale)
ADP3170
TOP VIEW
RU-20
19
18
17
16
15
14
13
12
11
20
GND
PGND
DRVH
DRVL
VCC
LRFB
LRDRV
COMP
CT
CS+