LTC2920-2_15 Datasheet, PDF (1/16 Pages) Linear Technology – Single/Dual Power Supply Margining Controller

FEATURES
■ _{Margin Voltage Precision <0.4%}
■ _{400:1 Current Programming Range}
■ _{Symmetric/Asymmetric High and Low Voltage}
Margining
■ _{Single Control Pin per Supply—High, Float, Low}
■ _{Single Current Setting Resistor per Supply}
■ _{Wide VCC Compliance 2.3V < VCC < 6V}
■ _{Wide Output Compliance}
0.6V < V_MARGIN < (V_CC – 0.6V)
■ _{Single in 5-Pin ThinSOT}^TM _(LTC2920-1)
■ _{Dual in 8-Pin MSOP (LTC2920-2)}
U
APPLICATIO S
■ _{Automated PCB Production Testing}
■ _{Automated Preventative Maintenance Testing}
■ _{DC/DC Converter Module Margining}
LTC2920-1/LTC2920-2
Single/Dual Power Supply
Margining Controller
DESCRIPTIO
The LTC^®2920 allows power supplies and power supply
module output voltages to be precisely adjusted both up
and down for automated PCB testing. The power supply
output voltage is changed by sourcing or sinking current
into the feedback node or voltage adjust pin of the power
supply. This allows a system to test the correct operation
of electrical components at the upper and/or lower power
supply voltage limits specified for a given design (Power
Supply “Margining”).
The LTC2920 uses a single resistor to set the voltage
margining current. The margining current is adjustable
over a 400:1 range. Precision margin currents can be
supplied to within 0.6V of ground or V_CC.
The LTC2920-1 is a single margining controller. The
LTC2920-2 has two independently controllable margining
channels. Each channel has its own control pin and current
setting resistor. The LTC2920-2 can be used to symmetri-
cally margin two power supplies, or asymmetrically mar-
gin a single power supply.
Both the LTC2920-1 and LTC2920-2 feature a trimmed on-
board voltage reference. Typical power supply margining
accuracy is better than 0.4%.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
+
33μF
–48V
3.3V Quarter Brick with ±5% Voltage Margining
1
+V_IN
5
+V_OUT
+
POWER ONE
I5S013ZE-A
TRIM
2
–V_IN
–V_OUT ⁶
7
150Ω
3.3V
AT 4A
0.1μF
2μF
V_{CC IN1}
I_M1 LTC2920-1
GND ^RS1
SYSTEM
CONTROLLER
THREE-STATE
R_SET1
10k
1%
2920-1/2 TA01
5%
NOM
–5%
LOGIC HI
LOGIC FLOAT
LOGIC LOW
+V_OUT
IN1
1ms/DIV
2920-1/2 TA01a
292012fa
1