US3010 Datasheet, PDF (1/11 Pages) UNISEM – 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC

US3010/3010A
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK
FEATURES
CONTROLLER IC
PRELIMINARY DATASHEET
DESCRIPTION
Dual Layout Compatible with SC1152
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 effi-
ciency
Patented architecture allows fixed frequency
operation as well as 100% duty cycle during
dynamic load
Over Voltage Protection Output
Soft Start
High current totem pole driver for direct driv-
ing of the external Power MOSFET
Power Good function
APPLICATIONS
Pentium II & Pentium Pro™ processor DC to DC
converter application
Low cost Pentium with AGP
The US3010 family of controller ICs are specifically de-
signed to meet Intel specification for Pentium II™ and
Pentium Pro™ microprocessor 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 ,will provide in excess of 16A of out-
put current for an on- board DC/DC converter while auto-
matically providing the right output voltage via the 5 bit
internal DAC .These devices also feature, loss less cur-
rent 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
and an OVP output. Other features of the device are ;
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.
TYPICAL APPLICATION
5V
C1
L1
C5
C3
Q1
R2
R3
R4
R5
L2
R8
R7
R10
C7
R9
Q2
R6
C8
C10
C4
C6
12V
R1
C2
VID4
VID3
VID2
VID1
VID0
12
2
V12 V5
9 NC
13 SS/BstH
D4
D3
16
17
6
CS+
D2
18
8
5
11
10
HDrv CS- LDrv Gnd
US3010
NC/ Ct/
D1
D0 PGndH AGnd
19
20
7
1
15
Vfb
En 14
PGd 4
OVP
3
R11 C9
R12
R13
C11
3010app1-1.1
OutEn
Power Good
OVP
Notes: Pentium II and Pentium Pro are
trade marks of Intel Corp.
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
0 TO 70
Device
US3010CW
US3010ACW
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. 1.1
5/18/98
4-1