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Analog Devices Semiconductor Electronic Components Datasheet

ADP3153 Datasheet

5-Bit Programmable Dual Power Supply Controller for Pentium II Processor

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ADP3153 pdf
a
FEATURES
5-Bit Digitally Programmable 1.8 V to 3.5 V Output
Voltage
Dual N-Channel Synchronous Driver
Total Output Accuracy ؎1% (0؇C to +70؇C)
High Efficiency
Current-Mode Operation
Short Circuit Protection
Power Good Output
Overvoltage Protection Crowbar
On-Board Linear Regulator Controller
VRM 8.2 Compatible
Narrow Body TSSOP 20-Lead Package
APPLICATIONS
Desktop PC Power Supply for:
Pentium II Processor
Deschutes Processor
Pentium Pro Processor
Pentium Processor
AMD–K6 Processor
VRM Modules
5-Bit Programmable Dual
Power Supply Controller
for Pentium® II Processor
ADP3153
GENERAL DESCRIPTION
The ADP3153 is a highly efficient synchronous switching regu-
lator controller and a linear regulator controller. The switching
regulator controller is optimized for Pentium II and Deschutes
Processor applications where 5 V is stepped down to a digitally
controlled output voltage between 1.8 V and 3.5 V. Using a 5-bit
DAC to read a voltage identification (VID) code directly from
the processor, the ADP3153 uses a current mode constant off-
time architecture to generate its precise output voltage.
The ADP3153 drives two N-channel MOSFETS in a synchro-
nous rectified buck converter, at a maximum switching fre-
quency of 250 kHz. Using the recommended loop compensation
and guidelines, the ADP3153 provides a dc/dc converter that
meets Intel’s stringent transient specifications with a minimum
number of output capacitors and smallest footprint. Addition-
ally, the current mode architecture also provides guaranteed
short circuit protection and adjustable current limiting.
The ADP3153’s linear regulator controller drives an external
N-channel device. The output voltage is set by the ratio of the
external feedback resistors. The controller has been designed for
excellent load transient response.
VCC
+12V
VIN
+5V
VO2
+3.3V
1A
R1
VIN
+5V R2
IRL2703
1000F
35k
20k
22F 1F
CCOMP
SD VCC
DRIVE1
CMP
ADP3153
VLDO
SENSE+
SENSE–
IRL3103
1nF
150pF
FB DRIVE2
CT PGND
AGND
VID0–VID4
IRL3103
+ CIN
L
2.5H
RSENSE
7m
10BQ015
+ CO
VO
1.8V–3.5V
14A
5-BIT CODE
Figure 1. Typical Application
Pentium is a registered trademark of Intel Corporation.
All other trademarks are the property of their respective holders.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998


Analog Devices Semiconductor Electronic Components Datasheet

ADP3153 Datasheet

5-Bit Programmable Dual Power Supply Controller for Pentium II Processor

No Preview Available !

ADP3153 pdf
ADP3153–SPECIFICATIONS (0؇C TA +70؇C, VCC = 12 V, VIN = 5 V, unless otherwise noted)
Parameter
Symbol Conditions
Min Typ Max Units
OUTPUT ACCURACY
1.8 V Output Voltage
2.8 V Output Voltage
3.5 V Output Voltage
VO With Respect to Nominal
–1.0
Output Voltage (Figure 1)
–1.0
–1.0
1.0 %
1.0 %
1.0 %
OUTPUT VOLTAGE LINE
REGULATION
OUTPUT VOLTAGE LOAD
REGULATION
INPUT DC SUPPLY CURRENT1
Normal Mode
Shutdown
CURRENT SENSE THRESHOLD
VOLTAGE
VID PINS THRESHOLD
Low
High
VO ILOAD = 10 A (Figure 2)
VIN = 4.75 V to 5.25 V
VO (Figure 2)
200 mA < ILOAD < 14 A
IQ VSD = 0.8 V
TA = +25°C, VSD = 2.0 V
V11–V10
V20, V1–V4
V10 Forced to VOUT – 3%
0.05
0.1
4.1
140
125 145
2.0
5.5
250
165
0.6
%
%
mA
µA
mV
V
V
VID PINS INPUT CURRENT
I20, I1–I4 VID = 0 V
110 220 µA
VID0–VID4 PULL-UP RESISTANCE
RVID
20 30
k
CT PIN DISCHARGE CURRENT
I12 TA = +25°C
VOUT in Regulation
VOUT = 0 V
65 µA
2 10 µA
OFFTIME
tOFF CT = 150 pF
1.8 2.45 3.2
µs
DRIVER OUTPUT TRANSITION
TIMES
tR, tF
CL = 7000 pF (Pins 16, 17)
TA = +25°C
120 200 ns
POSITIVE POWER GOOD TRIP POINT
VPWRGD
% Above Output Voltage
58%
NEGATIVE POWER GOOD TRIP POINT
VPWRGD
% Below Output Voltage
–8 –5
%
POWER GOOD RESPONSE TIME
tPWRGD
500 µs
CROWBAR TRIP POINT
VCROWBAR % Above Output Voltage
9 15 24 %
ERROR AMPLIFIER OUTPUT
IMPEDANCE
ROERR
145 k
ERROR AMPLIFIER
TRANSCONDUCTANCE
GMERR
2.2 mmho
ERROR AMPLIFIER MINIMUM
OUTPUT VOLTAGE
VCMPMIN V10 Forced to VOUT + 3%
0.8 V
ERROR AMPLIFIER MAXIMUM
OUTPUT VOLTAGE
VCMPMAX V10 Forced to VOUT – 3%
2.4 V
ERROR AMPLIFIER BANDWIDTH –3 dB BWERR
CMP = Open
500 kHz
LINEAR REGULATOR FEEDBACK
CURRENT
IFB
0.35 1
µA
LINEAR REGULATOR OUTPUT
VOLTAGE2
Figure 2
VO2 RPROG = 35K, R3 = 20K, IO2 = 1 A 3.24 3.30 3.38 V
SHUTDOWN (SD) PIN
Low Threshold
High Threshold
Input Current
SDL
SDH
SDIB
Part Active
Part in Shutdown
2.0
10
0.6 V
V
µA
NOTES
1Dynamic supply current is higher due to the gate charge being delivered to the external MOSFETS.
2The LDO is tested in a VOUT = 3.3 V configuration with the circuit shown in Figure 2. By selecting a different R PROG value, any output voltage above 1.20 V can
be set.
All limits at temperature extremes are guaranteed via correlation using standard quality control methods.
Specifications are subject to change without notice.
–2– REV. 0


Part Number ADP3153
Description 5-Bit Programmable Dual Power Supply Controller for Pentium II Processor
Maker Analog Devices
Total Page 12 Pages
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