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EZ1900
© 1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROA D NE WBURY PARK CA 91320
1
DESCRIPTION
The EZ1900 is a hi gh per formance positi ve load current balancer desi gned for use in applications utilizing 2 regulat or s i n par allel to achieve equal current
sharing or identical current f or eac h load. The regulator balance controller allows a flexible m otherboard
design to be made t o c ope with different processor
confi gur ations. The controll er reads a logic level upgrade signal (denoted V
CC2DET
on the Intel P 55C; similar on AM D, Cyrix and PowerPC microprocessors) to
control t he 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 regulator s are set t o the same output voltage
(usually 3.3 - 3.5V) and are configured in masterslave mode. For split plane processors (V
CC2DET
low),
the outputs of the two regulators are switched - the
core v oltage 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 resistor s. The
EZ1900 program mable current balancer is availabl e
in the popular S O-8 surface mount package.
FEATURES
•
Current balance c ontroller for r egulators in parallel
• Slave and non-slave voltage modes
• Slave or non-slave m ode c omputer selected
• Compati ble with 3 or 5 pin low drop regulator s
• Remote sense operation
• SO-8 package
APPLICATIONS
•
Flex ible upgrade from si ngle voltage plane to
split-plane processors
• Intel Pentium® Processor P54CS & P55C
upgrades
• PowerPC™ 603 & 604 upgrades
• AMD5
K
86™ upgrades
TEL:805-498-2111 F A X:805- 498- 3804 WEB:http://www.semtech.com
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Maximum Units
Input Voltage Supply V
IN
7V
Differential
Amplifier
-IN, +IN
S
OUT
7
0 to +V
V
Slave Output Current
(sink only)
I
SLAVE
50 mA
Thermal Resistance
Junction t o A mbient
θ
JA
160 °C/W
Operating J unc tion
Temperat ur e Range
T
J
0 to 70 °C
Storage
Temperat ur e Range
T
STG
-65 to 125 °C
Lead Temperat ur e
(Solderi ng) 5 S ec
T
LEAD
260 °C
PIN CONFIGURATION
Pin # Legend Descriptio n
1 Sel Non-slav e mode, voltage select
2 -IN Negative error amplifier input
3 +IN Positive error amplifier input
4 -V P ower i nput, common
5 nc No Connection
6S
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
opera tion 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. AMD5K86 is a trademark of Advanced Micro Devices.
Note:
(1) Add suffix ‘TR’ f or tape and reel.
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
EZ1900CS SO-8
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EZ1900
© 1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROA D NE WBURY 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
5mV
Common M ode Input
Range
V
CM
7V 1 7 V
Aver age Temperature
Coefficient,
Input DIFF Voltage
0.01 mV/°C
Input Current I
IC
50 200 nA
Common M ode 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 I nput Current
Low SEL = 0V I
SEL
-150 -200 µA
High SEL = 7V 1
Output
Slave Output Leakage S
OL
7V 1 µ A
Slave Output Resistance R
O
234
Ω
Power Supply Current
Slave Mode I
CC
500 700 µA
Non-Slave Mode 3 5 mA
Off Mode 700 µA
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: VIN = 5V; I
SLAVE
= 10mA; TJ = 25°C.
T
V
IE
∆
∆
Ω
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EZ1900
© 1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROA D NE WBURY PARK CA 91320
3
Non-Slave M ode (Slave Regulator) V
S
Notes:
V
S
= V
REF
(1 + (R2 + 3Ω) / R1) + I
ADJ
(R2 + 3Ω).
*The EZ1900 operating in the non-slav e mode operation will introduce approximately 3 ohms of r esi stanc e
in the voltage set path when selected. The c alculated
values are based upon this addition.
V
OUT
/RESISTOR SELECTION REFERENCE
(Resistor selection in Ω. See Typi c al Applications on following pages.)
Slave Mode ( M ast er Regulator) V
M
Notes:
V
M
= V
REF
(1 + R4 / R3) + I
ADJ
R
4.
Resistor selecti on 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 + R4/R3) + I
ADJ
R
4
Non-Slave Mode, VS = V
OUT
of Slave
V
S
= V
REF
(1 + (R2 + 3Ω) / R1) + I
ADJ
(R2 + 3Ω)
R
SENSE
Select
R
SENSE
Select; Typical selection can be
(50mV to 100mV) / (Total I
OUT
/ 2).
Trace resistance of 10mΩ and above can easily accomodate value
required.
Balanced Current Controller Utilizing EZ108X/EZ158X Series
TYPICAL APPLICATIONS
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EZ1900
© 1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROA D NE WBURY PARK CA 91320
4
TYPICAL APPLICATIONS (cont.)
Voltage Select
Slave Mode Operation V
M
= V
OUT
of Master
V
M
= V
REF
(1 + R4/R3) + I
ADJ
R
4
Non-Slave Mode, VS = V
OUT
of Slave
V
S
= V
REF
(1 + (R2 + 3Ω) / R1) + I
ADJ
(R2 + 3Ω)
R
SENSE
Select
R
SENSE
Select; Typical selection can be
(50mV to 100mV) / (Total I
OUT
/ 2).
Trace resistance of 10mΩ 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 + R4/R3) + I
ADJ
R
4
Non-Slave Mode, VS = V
OUT
of Slave
V
S
= V
REF
(1 + (R2 + 3Ω) / R1) + I
ADJ
(R2 + 3Ω)
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 va lue required.
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EZ1900
© 1999 SEMTECH CORP.
REGULATOR
BALANCE CONTROLLER
May 27, 1999
652 MITCHELL ROA D NE WBURY PARK CA 91320
5
OUTLINE DRAWING SO-8
LAND PATTERN SO-8
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