ADP3155 Analog Devices, ADP3155 Datasheet - Page 3

• Manufacturer Part Number: ADP3155
• Description: 5-Bit Programmable Triple Power Supply Controller for Pentium III Processors
• Manufacturer: Analog Devices

CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP3155 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
REV. A
Pin No.
1–4, 20
5
6
7, 14
8, 13
9
10
11
12
15
16
17
18
19
ABSOLUTE MAXIMUM RATINGS*
Input Supply Voltage (V
Shutdown Input Voltage . . . . . . . . . . . . . . . . –0.3 V to +16 V
Operating Ambient Temperature Range . . . . . 0 C to +70 C
Junction Temperature Range . . . . . . . . . . . . . 0 C to +150 C
Storage Temperature Range . . . . . . . . . . . . –65 C to +150 C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . +300 C
*This is a stress rating only; operation beyond these limits can cause the device to
Model
ADP3155JRU
be permanently damaged.
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 C/W
Mnemonic
VID1–VID4,
VID0
AGND
SD
FB1, FB2
V
SENSE–
SENSE+
C
CMP
PWRGD
V
DRIVE2
DRIVE1
PGND
LDO1
CC
T
Temperature
Range
0 C to +70 C
, V
LDO2
ORDERING GUIDE
CC
) . . . . . . . . . . . . . . –0.3 V to +16 V
Function
Voltage Identification DAC Inputs. These pins are pulled up to an internal reference, providing a
Logic 1 if left open. The DAC output programs the SENSE– regulation voltage from 1.3 V to 3.5 V.
Leaving all five DAC inputs open results in placing the ADP3155 into shutdown.
Analog Ground. All internal signals of the ADP3155 are referenced to this ground.
Shutdown. A logic high will place the ADP3155 in shutdown and disable both outputs. This pin is
internally pulled down.
divider from each respective linear regulator output to set its output voltage.
Gate drives for the respective linear regulator N-channel MOSFETs.
Connects to the internal resistor divider that senses the output voltage. This pin is also the reference
input for the current comparator.
The (+) input for the current comparator. The output current is sensed as a voltage at this pin with
respect to SENSE–.
External capacitor C
Error Amplifier output and compensation point. The voltage at this output programs the output cur-
rent control level between the SENSE pins.
Power Good. An open drain signal indicates that the output voltage is within a 5% regulation band.
Supply Voltage to ADP3155.
Gate Drive for the (bottom) synchronous rectifier N-channel MOSFET. The voltage at DRIVE2
swings from ground to V
Gate Drive for the buck switch N-channel MOSFET. The voltage at DRIVE1 swings from ground to
V
Power Ground. The drivers turn off the buck and synchronous MOSFETs by discharging their gate
capacitances to this pin. PGND should have a low impedance path to the source of the synchronous
MOSFET.
These pin are the feedback connections for the linear controllers. Connect each pin to the resistor
CC
Package
Description
Thin Shrink Small RU-20
Outline (TSSOP)
.
PIN FUNCTION DESCRIPTIONS
T
connection to ground sets the off time of the device.
Package
Option
CC
.
–3–
SENSE+
SENSE–
AGND
PIN CONFIGURATION
V
VID1
VID2
VID3
VID4
LDO1
FB1
SD
10
1
2
3
4
5
6
7
8
9
(Not to Scale)
ADP3155
TOP VIEW
WARNING!
20
19
18
17
16
15
14
13
12
11
VID0
PGND
DRIVE1
DRIVE2
V
PWRGD
FB2
V
CMP
C
CC
LDO2
T
ESD SENSITIVE DEVICE
ADP3155