CONTROLLER IC. US3012 Datasheet

US3012 IC. Datasheet pdf. Equivalent

Part US3012
Description 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC
Feature US3012/3012A 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC PRELIMINARY DATASHEET FEATURES Dual .
Manufacture UNISEM
Datasheet
Download US3012 Datasheet




US3012
US3012/3012A
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK
FEATURES
CONTROLLER IC
PRELIMINARY DATASHEET
DESCRIPTION
Dual Layout Compatible with RC5051
Designed to meet Intel specification of VRM8.2
& VRM8.3 for Pentium II
On board DAC programs the output voltage
from 1.3V to 3.5V (US3010) & 1.8V to 3.5V for
US3010A
Loss less Short Circuit Protection
Synchronous operation allows maximum
efficiency
Patented architecture allows fixed frequency
operation as well as 100% duty cycle during
dynamic load
Soft Start
High current totem pole driver for direct
driving of the external Power MOSFET
Power Good function
APPLICATIONS
Pentium II & Pentium Proprocessor DC to DC
converter application
Low cost Pentium with AGP
The US3012 family of controller ICs are specifically de-
signed to meet Intel specification for Pentium IIand
Pentium Promicroprocessor applications as well as
the next generation P6 family processors. These prod-
ucts feature a patented topology that in combination
with a few external components as shown in the typical
application circuit below ,will provide in excess of 16A
of output current for an on- board DC/DC converter while
automatically providing the right output voltage via the 5
bit internal DAC .These devices also feature, loss less
current sensing by using the Rds-on of the high side
Power MOSFET as the sensing resistor, a Power Good
window comparator that switches its open collector out-
put low when the output is outside of a ±10% window .
Other features of the device are ; Undervoltage lockout
for both 5V and 12V supplies as well as an external
programmable soft start function as well as program-
ming the oscillator frequency by using an external ca-
pacitor.
TYPICAL APPLICATION
5V
C1
L1
C5 R2
C3
Q1
R3
R4
R5
L2 R8
R7
C7
Q2
R6
R9
C11
C4 C6
12V
R1
C2
D1
13
V12
6
V5
7 NC/Vccp
16 SS/Vref
D4
8
D3
17
R10
4
CS+
D2
18
12 5
HDrv CS-
US3012
D1 D0
19 20
9
LDrv
10
Gnd
R11
14
Vfb/
GndD
En 2
NC/ NC/
GndP GndA
11 15
PGd 3
Ct
1
VID4
VID3
VID2
VID1
VID0
3012app1-1.1
C8
Notes: Pentium II and Pentium Pro are
trade marks of Intel Corp.
PACKAGE ORDER INFORMATION
R12
R13
OutEn
Power Good
C9 C10
Ta (°C)
0 TO 70
0 TO 70
Device
US3012CW
US3012ACW
Package
20 pin Plastic SOIC WB
20 pin Plastic SOIC WB
VID Voltage Range
1.3V to 3.5V
1.8V to 3.5V
Rev. 1.0
5/6/98
4-1



US3012
US3012/3012A
ABSOLUTE MAXIMUM RATINGS
V5 supply Voltage ........................................... 7V
V12 Supply Voltage ............................................ 20V
Storage Temperature Range ................................. -65 TO 150°C
Operating Junction Temperature Range .......... 0 TO 125°C
PACKAGE INFORMATION
20 PIN WIDE BODY PLASTIC SOIC (W)
Ct 1
En 2
PGd 3
CS+ 4
CS- 5
V5 6
NC 7
D4 8
LDrv 9
PGnd 10
TOP VIEW
20 D0
19 D1
18 D2
17 D3
16 SS
15 Gnd
14 Vfb
13 V12
12 HDrv
11 NC
θJA =85°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over ,V12 = 12V, V5 = 5V and Ta=0 to 70°C. Typical values
refer to Ta =25°C. Low duty cycle pulse testing are used which keeps junction and case temperatures equal to the
ambient temperature.
PARAMETER
VID Section
DAC output voltage
(note 1)
DAC Output Line Regulation
DAC Output Temp Variation
VID Input LO
VID Input HI
VID input internal pull-up
resistor to V5
Power Good Section
Under voltage lower trip point
Under voltage upper trip point
UV Hysterises
Over voltage upper trip point
Over voltage lower trip point
OV Hysterises
Power Good Output LO
Power Good Output HI
Soft Start Section
Soft Start Current
SYM TEST CONDITION
Vout ramping down
Vout ramping up
Vout ramping up
Vout ramping down
RL=3mA
RL=5K pull up to 5V
CS+ =0V , CS- =5V
MIN
0.99Vs
TYP
Vs
2
27
MAX
1.01Vs
0.1
0.5
0.4
UNITS
V
%
%
V
V
k
0.89Vs
.015Vs
1.09Vs
.015Vs
4.8
0.90Vs
0.92Vs
.02Vs
1.10Vs
1.08Vs
.02Vs
10
0.91Vs
.025Vs
1.11Vs
.025Vs
0.4
V
V
V
V
V
V
V
V
uA
4-2
Rev. 1.0
5/6/98







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