US3010/3010A
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC
PRELIMINARY DATASHEET
FEATURES
DESCRIPTION
Dual Layout Compatible with SC1152
The US3010 family of controller ICs are specifically de-
Designed to meet Intel specification of VRM8.2 signed to meet Intel specification for Pentium IIä and
& VRM8.3 for Pentium IIä Pentium Proä microprocessor applications as well as
On board DAC programs the output voltage the next generation P6 family processors. These prod-
from 1.3V to 3.5V (US3010) & 1.8V to 3.5V for ucts feature a patented topology that in combination
US3010A
Loss less Short Circuit Protection
with a few external components as shown in the typical
application circuit ,will provide in excess of 16A of out-
Synchronous operation allows maximum effi- put current for an on- board DC/DC converter while auto-
ciency matically providing the right output voltage via the 5 bit
Patented architecture allows fixed frequency internal DAC .These devices also feature, loss less cur-
operation as well as 100% duty cycle during rent sensing by using the Rds-on of the high side
dynamic load
Over Voltage Protection Output
Soft Start
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
High current totem pole driver for direct driv- and an OVP output. Other features of the device are ;
ing of the external Power MOSFET
Power Good function
Undervoltage lockout for both 5V and 12V supplies , an
external programmable soft start function as well as pro-
gramming the oscillator frequency by using an external
capacitor.
APPLICATIONS
Pentium II & Pentium Proä processor DC to DC
converter application
Low cost Pentium with AGP
TYPICAL APPLICATION
L1
L2
R8
Q1
5V
C5
R2
R4
R7
R10
C1
C7
R6
R9
C8
C3
C4
Q2
C10
R3
R5
C6
12V
R12
R13
12
V12
2
V5
6
CS+
8
HDrv
5
CS-
11
LDrv
10
Gnd
15
Vfb
R1
9
NC
En 14
OutEn
US3010
13 SS/BstH
PGd 4
Power Good
NC/ Ct/
D0 PGndH AGnd OVP
C11
D4
16
D3
17
D2
18
D1
19
C2
20
7
1
3
OVP
VID4
VID3
VID2
VID1
VID0
3010app1-1.1
R11
C9
Notes: Pentium II and Pentium Pro are
trade marks of Intel Corp.
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
0 TO 70
Device
Package
VID Voltage Range
1.3V to 3.5V
1.8V to 3.5V
US3010CW
US3010ACW
20 pin Plastic SOIC WB
20 pin Plastic SOIC WB
Rev. 1.1
5/18/98
4-1