US3010 UNISEM, US3010 Datasheet

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US3010

Manufacturer Part Number
US3010
Description
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC
Manufacturer
UNISEM
Datasheet
FEATURES
TYPICAL APPLICATION
PACKAGE ORDER INFORMATION
FEATURES
TYPICAL APPLICATION
PACKAGE ORDER INFORMATION
Notes: Pentium II and Pentium Pro are
trade marks of Intel Corp.
Rev. 1.1
5/18/98
APPLICATIONS
APPLICATIONS
Pentium II & Pentium Pro
converter application
Low cost Pentium with AGP
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
Ta ( C)
0 TO 70
0 TO 70
VID4
VID3
VID2
VID1
VID0
12V
5V
C2
C1
R1
13
9
C3
C4
L1
NC
SS/BstH
Device
US3010CW
US3010ACW
V12
D4
12
16
C5
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK
processor DC to DC
V5
D3
17
2
C6
R2
CS+
D2
18
6
R3
HDrv
US3010
Q1
D1
19
8
20 pin Plastic SOIC WB
20 pin Plastic SOIC WB
CS-
Package
D0
20
5
R4
R5
PGndH
LDrv
NC/
11
7
R11
AGnd
Gnd
10
Ct/
Q2
1
C9
DESCRIPTION
DESCRIPTION
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.
OVP
Vfb
15
PGd
3
C7
R6
L2
En
R7
14
4
R8
R9
C8
R12
C11
3010app1-1.1
R10
VID Voltage Range
1.3V to 3.5V
1.8V to 3.5V
R13
C10
CONTROLLER IC
OutEn
Power Good
OVP
PRELIMINARY DATASHEET
US3010/3010A
4-1

Related parts for US3010

US3010 Summary of contents

Page 1

... FEATURES 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 ...

Page 2

... US3010/3010A ABSOLUTE MAXIMUM RATINGS 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 PACKAGE INFORMATION 20 PIN WIDE BODY PLASTIC SOIC (W) TOP VIEW OVP ...

Page 3

... Output voltage is disabled for US3010A. ** Output voltage is disabled for all versions. Rev. 1.1 5/18/98 Supply ramping up 9.2 0.3 Supply ramping up 4.1 0.2 -2 Vdiff=10mV 160 -5 Css=0.1 uF CL=3000pF V5 V12 CL=3000pF CL=3000pF CL=3000pF 100 Ct=150pF 190 2 D0 ...

Page 4

... US3010/3010A PIN DESCRIPTIONS PIN DESCRIPTIONS PIN# PIN SYMBOL Pin Description 20 D0 LSB input to the DAC that programs the output voltage. This pin can be pulled up exter- nally by a 10k resistor to either 3. supply Input to the DAC that programs the output voltage.This pin can be pulled up externally by a 10k resistor to either 3 ...

Page 5

... BLOCK DIAGRAM BLOCK DIAGRAM En V12 UVLO 5Bit DAC, D2 Ctrl Logic D3 D4 1.18Vset OVP Gnd Figure 1 - Simplified block diagram of the US3010/3010A. Rev. 1.1 5/18/98 Enable Vset Enable PWM + Control Vset Slope Enable Comp Osc Soft Start & Fault Logic Enable US3010/3010A Vfb V12 ...

Page 6

... VID4 VID3 VID2 VID1 VID0 Figure 2- Typical application of US3010/3010A board DC-DC converter providing the Core supply for the Table of components that need to be modified to make the dual layout work for US3010A* and SC1152. Part # SC1152 US3010A* O ...

Page 7

... US3010/3010A and SC1152 Dual Layout Parts List Ref Desig Description Q1 MOSFET Q2 MOSFET L1 Inductor L2 Inductor C10 Capacitor ,Electrolytic C3 Capacitor ,Electrolytic C1 Capacitor ,Electrolytic C2 Capacitor , Ceramic C5 Capacitor , Ceramic C4,6 Capacitor , Ceramic C9 Capacitor , Ceramic C7 Capacitor , Ceramic C11 Capacitor , Ceramic C8 Capacitor , Ceramic R2 Resistor R3 Resistor R4 Resistor R5 Resistor R6 Resistor ...

Page 8

... US3010/3010A Application Information Application Information An example of how to calculate the components for the application circuit is given below. Assuming, two sets of output conditions that this regu- lator must meet, a) Vo=2.8V , Io=14.2A, Vo=185mV, Io=14.2A b) Vo=2V , Io=14.2A, Vo=140mV, Io=14.2A The regulator design will be done such that it meets the worst case requirement of each condition. ...

Page 9

... Ton = 0. 3.1 uSec Toff = 5 - 3.1 = 1.9 uSec 2 1.94 * .006 = .011 Rev. 1.1 5/18/98 US3010/3010A Power Component Selection Assuming IRL3103 MOSFETs as power components, we will calculate the maximum power dissipation as fol- lows: For high side switch the maximum power dissipation happens at maximum Vo and maximum duty cycle. ...

Page 10

... Rcs is calculated as : Vcs=IcL*Rds=22*0.019=0.418V Rcs=Vcs/Ib=(0.418V)/(200uA)=2.1k Where: Ib=200uA is the internal current setting of the device Switcher Timing Capacitor Selection The US3010A frequency can be programmed using an external timing capacitor. The value of Ct can be ap- proximated using the equation below ...

Page 11

... Drain b) Q1 Source to Q2 Drain Rev. 1.1 5/18/98 US3010/3010A c) Q2 drain the output capacitors, C10 e) C10 to the slot 1 f) Input filter L1 to the C3 Connect the rest of the components using the shortest ...

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