ADP3157 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADP3157 Datasheet PDF : 12 Pages
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ADP3157
Pin No.
1–4, 16
Mnemonic
VID1–VID4,
VID0
5
AGND
6
SD
7
SENSE–
8
SENSE+
9
CT
10
CMP
11
PWRGD
12
VCC
13
DRIVE2
14
DRIVE1
15
PGND
PIN FUNCTION DESCRIPTIONS
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 CT connection to ground sets the off time of the device.
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 VCC.
Gate Drive for the buck switch N-channel MOSFET. The voltage at DRIVE1 swings from ground to
VCC.
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.
ABSOLUTE MAXIMUM RATINGS*
Input Supply Voltage (VCC) . . . . . . . . . . . . . . –0.3 V to +16 V
VID0–VID4, SD, PWRGD, CMP, CT . . . . . . . –0.3 V to VCC
DRIVE1, DRIVE2, SENSE+, SENSE– . . . . . . –0.3 V to VCC
Operating Ambient Temperature Range . . . . . . 0°C to +70°C
Junction Temperature Range . . . . . . . . . . . . . . 0°C to +150°C
θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W
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
be permanently damaged.
ORDERING GUIDE
Model
ADP3157JR
Temperature
Range
0°C to +70°C
Package
Package
Description Options
16-Lead SOIC R-16A/SO-16
PIN CONFIGURATION
VID1 1
16 VID0
VID2 2
15 PGND
VID3 3
14 DRIVE1
VID4 4 ADP3157 13 DRIVE2
TOP VIEW
AGND 5 (Not to Scale) 12 VCC
SD 6
11 PWRGD
SENSE– 7
10 CMP
SENSE+ 8
9 CT
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.
WARNING!
ESD SENSITIVE DEVICE
REV. A
–3–
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