LTC2920-1/LTC2920-2
Single/Dual Power Supply
Margining Controller
FEATURES DESCRIPTIO
Margin Voltage Precision <0.4% The LTC 2920 allows power supplies and power supply
400:1 Current Programming Range module output voltages to be precisely adjusted both up
Symmetric/Asymmetric High and Low Voltage and down for automated PCB testing. The power supply
Margining output voltage is changed by sourcing or sinking current
Single Control Pin per SupplyHigh, Float, Low into the feedback node or voltage adjust pin of the power
Single Current Setting Resistor per Supply supply. This allows a system to test the correct operation
Wide V Compliance 2.3V < V < 6V of electrical components at the upper and/or lower power
CC CC
Wide Output Compliance supply voltage limits specified for a given design (Power
0.6V < V < (V 0.6V) Supply Margining).
MARGIN CC
TM
Single in 5-Pin ThinSOT (LTC2920-1)
The LTC2920 uses a single resistor to set the voltage
Dual in 8-Pin MSOP (LTC2920-2)
margining current. The margining current is adjustable
over a 400:1 range. Precision margin currents can be
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supplied to within 0.6V of ground or V .
CC
APPLICATIO S
The LTC2920-1 is a single margining controller. The
Automated PCB Production Testing
LTC2920-2 has two independently controllable margining
Automated Preventative Maintenance Testing
channels. Each channel has its own control pin and current
DC/DC Converter Module Margining
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
3.3V Quarter Brick with 5% Voltage Margining
1 5 3.3V
+V +V
IN OUT AT 4A
5%
150 0.1F
+
POWER ONE
2F SYSTEM
+V
I5S013ZE-A NOM OUT
CONTROLLER
+
33F
V
THREE-STATE
CC IN1
I LTC2920-1
TRIM M1
5%
R
GND S1
LOGIC HI
R
SET1
10k
IN1
1%
6
LOGIC FLOAT
V
OUT
LOGIC LOW
2 7
V
48V
IN
2920-1/2 TA01
1ms/DIV 2920-1/2 TA01a
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ULTC2920-1/LTC2920-2
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (V ) ................................0.3V to 6.5V Operating Temperature Range
CC
Input Voltages LTC2920-1C/LTC2920-2C ....................... 0C to 70C
(IN1, IN2, R , R )................. 0.3V to (V + 0.3V) LTC2920-1I/LTC2920-2I .................... 40C to 85C
S1 S2 CC
Output Voltages (I , I ) ........... 0.3V to (V + 0.3V) Storage Temperature Range ................. 65C to 150C
M1 M2 CC
Lead Temperature (Soldering, 10 sec).................. 300C
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PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER ORDER PART NUMBER
TOP VIEW
TOP VIEW
LTC2920-1CS5 LTC2920-2CMS8
V 1 5 IN1 R 1 8 V
CC S2 CC
LTC2920-1IS5 LTC2920-2IMS8
IN2 2 7 I
M2
GND 2
IN1 3 6 GND
I 3 4 R
R 4 5 I
M1 S1 M1
S1
S5 PART MARKING MS8 PART MARKING
MS8 PACKAGE
S5 PACKAGE
8-LEAD PLASTIC MSOP
5-LEAD PLASTIC SOT-23
LTD7 LTB6
T = 125C, = 200C/W
T = 125C, = 250C/W JMAX JA
JMAX JA
LTD8 LTA4
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, C = C = 20pF, otherwise specifications are at T = 25C.
RS1 RS2 A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
V Supply Operating Range (Note 2) 2.3 6 V
CC
I Supply Current while Sourcing Max I R = R = 15k, 6mA
CC(SOURCE) IM SET1 SET2
IN1 = IN2 < V
IL
I Quiescent Supply Current R = R = 200k, 0.23 1 mA
CC(Q) SET1 SET2
IN1 = IN2 V
IL
Current Margining Outputs I , I
M1 M2
I Low Range I Current R , R Tied to GND, 5 167 A
IMLOW MARGIN SET1 SET2
Sourcing or Sinking IN1, IN2 > V or IN1, IN2 < V , (Note 4)
IH IL
I High Range I Current R , R Tied to V , 0.15 2 mA
IMHIGH MARGIN SET1 SET2 CC
Sourcing or Sinking IN1, IN2 > V or IN1, IN2 < V , (Note 4)
IH IL
V I , I Output Voltage Compliance (Note 3) 0.55 V 0.55 V
M M1 M2 CC
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