LTC2920-2 Linear Technology, LTC2920-2 Datasheet

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LTC2920-2

Manufacturer Part Number
LTC2920-2
Description
Single/Dual Power Supply Margining Controller
Manufacturer
Linear Technology
Datasheet

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TYPICAL APPLICATIO
FEATURES
APPLICATIO S
–48V
33μF
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 V
Wide Output Compliance
0.6V < V
Single in 5-Pin ThinSOT
Dual in 8-Pin MSOP (LTC2920-2)
Automated PCB Production Testing
Automated Preventative Maintenance Testing
DC/DC Converter Module Margining
+
1
2
CC
MARGIN
+V
–V
3.3V Quarter Brick with ±5% Voltage Margining
Compliance 2.3V < V
IN
IN
POWER ONE
I5S013ZE-A
< (V
U
+V
–V
TRIM
OUT
OUT
CC
5
6
7
– 0.6V)
+
TM
(LTC2920-1)
2μF
U
CC
I
M1
150Ω
< 6V
LTC2920-1
GND
V
CC
0.1μF
3.3V
AT 4A
R
IN1
S1
R
10k
1%
SET1
THREE-STATE
CONTROLLER
SYSTEM
2920-1/2 TA01
DESCRIPTIO
The LTC
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
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%.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Single/Dual Power Supply
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
2920 allows power supplies and power supply
LOGIC FLOAT
LTC2920-1/LTC2920-2
Margining Controller
LOGIC LOW
LOGIC HI
NOM
–5%
5%
U
www.DataSheet4U.com
1ms/DIV
CC
.
2920-1/2 TA01a
292012fa
+V
IN1
1
OUT

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LTC2920-2 Summary of contents

Page 1

... 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. ...

Page 2

... Sourcing or Sinking Output Voltage Compliance Operating Temperature Range LTC2920-1C/LTC2920-2C ....................... 0°C to 70°C + 0.3V) LTC2920-1I/LTC2920-2I .................... – 40°C to 85° 0.3V) Storage Temperature Range ................. – 65°C to 150°C CC Lead Temperature (Soldering, 10 sec).................. 300° LTC2920-1CS5 TOP VIEW LTC2920-1IS5 ...

Page 3

... Note 5: Determined by design, not production tested ⏐ Note 6: 1 – (I > 4V: 0.58 ≤ and I are ⏐ Note 7: 1 – (I accuracy will vary within ≤ 20pF LTC2920-1/LTC2920-2 www.DataSheet4U.com MIN TYP MAX ● 3 7.5 ● ● ● ● ● ...

Page 4

... I Power Filtering in the pin is a high impedance output. Internally, the IN1 pin is connected to a 1.2V voltage source by an internal ~10k resistor. The LTC2920 has an internal RC circuit to sup- press noise entering from this pin. LTC2920-2 Only R (NA/Pin 1 See R ...

Page 5

... V (V) MARGIN 2920-1/2 G04 I Rise Time MARGIN HIGH RANGE V IN(DELAYON) ENDS 0% LOW RANGE HIGH RANGE 1μs/DIV LTC2920-1/LTC2920 Low Range CC MARGIN Sourcing Current 1800 1600 2 CHANNELS 1400 1200 1000 800 1 CHANNEL 600 400 200 100 120 140 160 180 I (μ ...

Page 6

... LTC2920-2 ONLY W U voltage above the nominal power supply voltage and a different voltage below the nominal, the LTC2920-2 can be used. One channel is used for margining above the nomi- nal power supply voltage, and the other channel is used to margin below the nominal voltage. ...

Page 7

... F supply module. This limit includes V age drop across R supply module specifications for details. See the “Select- • MARGIN F ing The R SET depends only on tions on how to choose R LTC2920-1/LTC2920-2 www.DataSheet4U.com or ground with analog switches or relays SENSE R SYSTEM + + ...

Page 8

... LTC2920-1/LTC2920 APPLICATIO S I FOR ATIO SELECTING THE R RESISTOR SET Selecting R with an Existing Power Supply SET Containing a Feedback Pin and Two Feedback Resistors Calculating the value of the current setting resistor, R for a power supply with a feedback pin is straight forward. When the LTC2920 is being added to an existing power ...

Page 9

... Figure 9 shows a typical current trim down curve for the same power module SET 2920-1/2 F07 Figure 8. Typical Trim Voltage vs Trim Resistor Curve Figure 9. Typical Trim Voltage vs Trim Current Curve LTC2920-1/LTC2920-2 www.DataSheet4U.com 1M 100k 10k 1k 100 ...

Page 10

... LTC2920-1/LTC2920 APPLICATIO S I FOR ATIO Even though the manufacturer does not directly supply the equation for the trim current, a simple measurement can be made to calculate an equation for TRIM To do this, select the trim resistor configuration which places the trim resistor between the trim pin and ground (see Figure 10) ...

Page 11

... MARGIN will cause MARGIN Figure 11. Sources of Power Supply Margined Voltage Errors resistor would SET errors caused by the R = 20k SET MARGIN Figure 12. Power Supply Voltage Margin Model LTC2920-1/LTC2920-2 www.DataSheet4U.com MARGIN will be similar G and R can be a major contributor 0.7 0.6 1% FEEDBACK RESISTOR INACCURACY ...

Page 12

... LTC2920-1/LTC2920 APPLICATIO S I FOR ATIO PREVENTING POTENTIAL POWER SUPPLY OVERVOLTAGES Care must be taken when selecting the power source for the LTC2920 the LTC2920 is not powered, and CC the power supply being margined is on, undesired I current can flow into the I pin of the LTC2920 ...

Page 13

... IN occur. Connecting V Supplies Being Margined not practical to power the LTC2920-2 from the V and/or V connect the V diode (Figure 18). This solution works with power supply feedback voltages less that 1.5V and I >30μA. Be sure to account for the diode drop across all temperatures to ensure the LTC2920-2 V specifications are met ...

Page 14

... POWER SUPPLY 1 OUT FB POWER SUPPLY 2 OUT BAT54C LTC2920-2 SCHOTTKY I M1 DIODE Figure 18. Diode Connected to V Controlling I Turn On and Turn Off Times MARGIN Designers of power supply voltage margining circuits often need to ensure that power supply voltages do not overshoot or undershoot (the desired margining voltage) when the margining current is enabled or disabled ...

Page 15

... DETAIL “A” 0.254 (.010) 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) SEATING PLANE LTC2920-1/LTC2920-2 www.DataSheet4U.com 2.90 BSC (NOTE 4) 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.01 – 0.10 1.90 BSC S5 TSOT-23 0302 3.00 ± 0.102 (.118 ± .004) 0.52 (.0205) ...

Page 16

... LTC2920-1/LTC2920-2 U TYPICAL APPLICATIO S L1 10μ 2.2μ LT1930 4 SHDN SHDN GND 2 C1: TAIYO YUDEN X5R LMK212BJ225MG C2: TAIYO YUDEN X5R EMK316BJ475ML D1: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR43-100 *OPTIONAL C V OSC IN C OSC RUN/SS TG 68pF 0.1μ 150pF LTC1435A ...

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