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EZ1900
1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROAD NEWBURY PARK CA 91320
1
DESCRIPTION
The EZ1900 is a high performance positive load cur-
rent balancer designed for use in applications utiliz-
ing 2 regulators in parallel to achieve equal current
sharing or identical current for each load. The regula-
tor balance controller allows a flexible motherboard
design to be made to cope with different processor
configurations. The controller reads a logic level up-
grade signal (denoted V
CC2DET
on the Intel P55C; sim-
ilar on AMD, Cyrix and PowerPC microprocessors) to
control the output voltage of two linear low dropout
voltage regulators to the CPU core and I/O planes. In
single-voltage plane configurations (V
CC2DET
floating),
both regulators are set to the same output voltage
(usually 3.3 - 3.5V) and are configured in master-
slave mode. For split plane processors (V
CC2DET
low),
the outputs of the two regulators are switched - the
core voltage will be set to a nominal 2.5V while the
I/O voltage will remain at 3.3V. The actual output
voltages can be adjusted by means of resistors. The
EZ1900 programmable current balancer is available
in the popular SO-8 surface mount package.
FEATURES
Current balance controller for regulators in parallel
Slave and non-slave voltage modes
Slave or non-slave mode computer selected
Compatible with 3 or 5 pin low drop regulators
Remote sense operation
SO-8 package
APPLICATIONS
Flexible upgrade from single voltage plane to
split-plane processors
Intel Pentium Processor P54CS & P55C
upgrades
PowerPCTM 603 & 604 upgrades
AMD5
K
86TM upgrades
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Maximum
Units
Input Voltage Supply
V
IN
7
V
Differential
Amplifier
-IN, +IN
S
OUT
7
0 to +V
V
Slave Output Current
(sink only)
I
SLAVE
50
mA
Thermal Resistance
Junction to Ambient
JA
160
C/W
Operating Junction
Temperature Range
T
J
0 to 70
C
Storage
Temperature Range
T
STG
-65 to 125
C
Lead Temperature
(Soldering) 5 Sec
T
LEAD
260
C
PIN CONFIGURATION
Pin #
Legend
Description
1
Sel
Non-slave mode, voltage select
2
-IN
Negative error amplifier input
3
+IN
Positive error amplifier input
4
-V
Power input, common
5
nc
No Connection
6
S
OUT
Sets V
OUT
of slave device
7
+V
Power input, positive
8
nc
No connection
Slave Mode Pin: For non "Computer Select Operation", the Select
Mode, pin #1, can be left open circuited for continuous slave mode
operation or balance current control. Ground the Select Mode, pin #1,
for non-slave mode operation.
Pentium Processor is a trademark of Intel Corp. PowerPC is a trademark of IBM Corp. AMD5
K
86 is a trademark of Advanced Micro Devices.
Note:
(1) Add suffix `TR' for tape and reel.
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
EZ1900CS
SO-8
EZ1900
1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROAD NEWBURY PARK CA 91320
2
Test Conditions
Test Limits
Parameter
Symbol
+V
S
OUT
T
J
Min
Typ
Max
Units
Input
Input Error Voltage
V
IO
5
mV
Common Mode Input
Range
V
CM
7V
1
7
V
Average Temperature
Coefficient,
Input DIFF Voltage
0.01
mV/C
Input Current
I
IC
50
200
nA
Common Mode Rejection
Ratio
CMRR
7V
70
80
dB
Power Supply Rejection
Ration
PSRR
60
70
dB
Sensitivity
I
OUT
/
V
DIFF
10
50
Select Threshold
Low
High
V
TH
2.4
0.8
V
Select Input Current
Low SEL = 0V
I
SEL
-150
-200
A
High SEL = 7V
1
Output
Slave Output Leakage
S
OL
7V
1
A
Slave Output Resistance
R
O
2
3
4
Power Supply Current
Slave Mode
I
CC
500
700
A
Non-Slave Mode
3
5
mA
Off Mode
700
A
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: V
IN
= 5V; I
SLAVE
= 10mA; T
J
= 25C.
T
V
IE
EZ1900
1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROAD NEWBURY PARK CA 91320
3
Non-Slave Mode (Slave Regulator) V
S
Notes:
V
S
= V
REF
(1 + (R
2
+ 3
) / R
1
) + I
ADJ
(R
2
+ 3
).
*The EZ1900 operating in the non-slave mode opera-
tion will introduce approximately 3 ohms of resistance
in the voltage set path when selected. The calculated
values are based upon this addition.
V
OUT
/RESISTOR SELECTION REFERENCE
(Resistor selection in
. See Typical Applications on following pages.)
Slave Mode (Master Regulator) V
M
Notes:
V
M
= V
REF
(1 + R
4
/ R
3
) + I
ADJ
R
4.
Resistor selection is based upon standard table for 1%
resistors.
V
OUT
R3
R4
Calc V
OUT
3.500
130
232
3.494
3.300
115
187
3.293
2.900
133
174
2.895
2.800
137
169
2.801
2.700
137
158
2.700
2.600
121
130
2.600
2.500
115
115
2.506
V
OUT
R1
R2
*Calc V
OUT
3.500
137
243
3.508
3.300
137
221
3.306
2.900
137
178
2.911
2.800
124
150
2.801
2.700
130
147
2.701
2.600
121
127
2.600
2.500
133
137
2.498
Voltage Select
Slave Mode Operation V
M
= V
OUT
of Master
V
M
= V
REF
(1 + R
4
/R
3
) + I
ADJ
R
4
Non-Slave Mode, V
S
= V
OUT
of Slave
V
S
= V
REF
(1 + (R
2
+ 3
) / R
1
) + I
ADJ
(R
2
+ 3
)
R
SENSE
Select
R
SENSE
Select; Typical selection can be
(50mV to 100mV) / (Total I
OUT
/ 2).
Trace resistance of 10m
and above can easily accomodate value
required.
Balanced Current Controller Utilizing EZ108X/EZ158X Series
TYPICAL APPLICATIONS
EZ1900
1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROAD NEWBURY PARK CA 91320
4
TYPICAL APPLICATIONS (cont.)
Voltage Select
Slave Mode Operation V
M
= V
OUT
of Master
V
M
= V
REF
(1 + R
4
/R
3
) + I
ADJ
R
4
Non-Slave Mode, V
S
= V
OUT
of Slave
V
S
= V
REF
(1 + (R
2
+ 3
) / R
1
) + I
ADJ
(R
2
+ 3
)
R
SENSE
Select
R
SENSE
Select; Typical selection can be
(50mV to 100mV) / (Total I
OUT
/ 2).
Trace resistance of 10m
and above can easily accomodate value
required.
Balanced Current Controller Utilizing EZ1087 Series
Balanced Current Controller Utilizing EZ1580 Series
Voltage Select
Slave Mode Operation V
M
= V
OUT
of Master
V
M
= V
REF
(1 + R
4
/R
3
) + I
ADJ
R
4
Non-Slave Mode, V
S
= V
OUT
of Slave
V
S
= V
REF
(1 + (R
2
+ 3
) / R
1
) + I
ADJ
(R
2
+ 3
)
R
SENSE
Select
R
SENSE
Select (100mV Min) / (Total I
OUT
/ 2)
The EZ1580 series requires R
SENSE
voltage to be less than 100mV.
Trace resistance can easily accomodate value required.
EZ1900
1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROAD NEWBURY PARK CA 91320
5
OUTLINE DRAWING SO-8
LAND PATTERN SO-8
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