EZ1900 Datasheet, PDF (1/5 Pages) Semtech Corporation – REGULATOR BALANCE CONTROLLER

REGULATOR
BALANCE CONTROLLER
EZ1900
May 27, 1999
TEL:[phone] FAX:[phone] WEB:http://www.semtech.com
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.
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.
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
• PowerPC™ 603 & 604 upgrades
• AMD5_K86™ upgrades
ORDERING INFORMATION
DEVICE⁽¹⁾
PACKAGE
EZ1900CS
SO-8
Note:
(1) Add suffix ‘TR’ for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Maximum Units
Input Voltage Supply
Differential
Amplifier
Slave Output Current
(sink only)
V_IN
-IN, +IN
S_OUT
I_SLAVE
7
7
0 to +V
50
Thermal Resistance
Junction to Ambient
θ_JA
160
Operating Junction
Temperature Range
T_J
0 to 70
Storage
Temperature Range
T_STG -65 to 125
Lead Temperature
(Soldering) 5 Sec
T_LEAD
260
V
V
mA
°C/W
°C
°C
°C
© 1999 SEMTECH CORP.
Pentium Processor is a trademark of Intel Corp. PowerPC is a trademark of IBM Corp. AMD5K86 is a trademark of Advanced Micro Devices.
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