ADP3157JR-REEL Analog Devices Inc, ADP3157JR-REEL Datasheet - Page 3

• Manufacturer Part Number: ADP3157JR-REEL
• Description: IC CNTRL SYNC PENTIUM III 16SOIC
• Manufacturer: Analog Devices Inc

Specifications of ADP3157JR-REEL

• Rohs Status: RoHS non-compliant
• Applications: Controller, Intel Pentium® III
• Voltage - Input: 12V
• Number Of Outputs: 1
• Voltage - Output: 1.3 ~ 3.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)

ABSOLUTE MAXIMUM RATINGS*
Input Supply Voltage (V
VID0–VID4, SD, PWRGD, CMP, C
DRIVE1, DRIVE2, SENSE+, SENSE– . . . . . . –0.3 V to 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
ADP3157JR
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 ADP3157 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.
Pin No.
1–4, 16
5
6
7
8
9
10
11
12
13
14
15
REV. A
be permanently damaged.
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 C/W
Mnemonic
VID1–VID4,
VID0
AGND
SD
SENSE–
SENSE+
C
CMP
PWRGD
V
DRIVE2
DRIVE1
PGND
CC
T
Temperature
Range
0 C to +70 C
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
one if left open. The DAC output programs the SENSE– regulation voltage from 1.3 V to 3.5 V. Leav-
ing all five DAC inputs open results in placing the ADP3157 into shutdown.
Analog Ground. All internal signals of the ADP3157 are reference to this ground.
Shutdown. A logic high will place the ADP3157 in shutdown and disable both outputs. This pin is
internally pulled down.
Connects to the internal resistor divider that senses the output voltage. This pin is also the (–) 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 ADP3157.
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.
Package
Description
16-Lead SOIC R-16A/SO-16
CC
.
T
. . . . . . . –0.3 V to V
PIN FUNCTION DESCRIPTIONS
Package
Options
T
connection to ground sets the off time of the device.
CC
.
CC
CC
–3–
SENSE+
SENSE–
PIN CONFIGURATION
AGND
VID1
VID2
VID3
VID4
SD
1
2
3
4
5
6
7
8
(Not to Scale)
ADP3157
TOP VIEW
WARNING!
16
15
14
13
12
11
10
9
VID0
PGND
DRIVE1
DRIVE2
V
PWRGD
CMP
C
CC
T
ESD SENSITIVE DEVICE
ADP3157