LTC2925 Linear Technology, LTC2925 Datasheet - Page 3

• Manufacturer Part Number: LTC2925
• Description: Multiple Power Supply Tracking Controller
• Manufacturer: Linear Technology

temperature range, otherwise specifications are at T
SYMBOL
I
V
V
I
I
I
V
V
V
V
I
V
V
I
V
I
V
R
I
I
V
I
V
I
V
I
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into the device pins are positive; all currents out of
device pins are negative. All voltages are referenced to ground unless
otherwise specified.
ELECTRICAL CHARACTERISTICS
GATE
ON(IN)
SENSEN
SENSEP
RAMP
ERROR(%)
FB(LEAK)
SCTMR(UP)
SCTMR(DN)
SDTMR(UP)
PGI(UP)
PGTMR(UP)
ON(TH)
ON(FC)
OS
FAULT(OL)
SDx(OL)
STATUS(OL)
RAMPBUF(OL)
RAMPBUF(OH)
TRACKx
FB(CLAMP)
SCTMR(TH)
SDTMR(TH)
PGI(TH)
PGTMR(TH)
V
V
V
V
REMOTE
CC(UVL, HYST)
GATE
ON(HYST)
RS-SENSE(TH)
PARAMETER
Input Supply Undervoltage Lockout Hysteresis
External N-Channel Gate Drive (V
GATE pin current
ON Pin Threshold Voltage
ON Pin Hysteresis
ON Pin Fault Clear Threshold Voltage
ON Pin Input Current
Sense Resistor Over-Current Voltage Threshold 1V < V
(V
SENSEN Pin Input Current
SENSEP Pin Input Current
Ramp Buffer Offset (V
FAULT Output Low Voltage
SDx Output Low Voltage
STATUS Output Low Voltage
RAMP Pin Input Current
RAMPBUF Low Voltage
RAMPBUF High Voltage (V
I
I
TRACK pin voltage
I
V
REMOTE Feedback Switch Resistance
Short-Circuit Timer Pullup Current
Short-Circuit Timer Pulldown Current
Short-Circuit Timer Threshold Voltage
Shutdown Timer Pullup Current
Shutdown Timer Threshold Voltage
Power Good Input Pullup Current
Power Good Input Threshold Voltage
Power Good Timer Pullup Current
Power Good Timer Threshold Voltage
FBx
ERROR(%)
FB
FB
SENSEP
Leakage Current
Clamp Voltage
to I
TRACKx
– V
= (I
SENSEN
FBx
Current Mismatch
– I
)
TRACKx
RAMPBUF
)/I
CC
TRACKx
– V
– V
GATE
RAMPBUF
RAMP
– V
)
CC
)
A
)
= 25 C. V
CONDITIONS
I
Gate On, V
Gate Off, V
Gate Off, V
Short-Circuit or Power Good Timeout
V
V
0V < V
0V < V
0V < V
V
I
I
I
0V < RAMP < V
I
I
I
I
I
I
V
1 A < I
2V < V
V
V
V
V
V
GATE
FAULT
SDx
STATUS
RAMPBUF
RAMPBUF
TRACKx
TRACKx
TRACKx
TRACKx
ON
ON
RAMPBUF
FB
SCTMR
SCTMR
SDTMR
PGI
PGTMR
The
= 1.5V, V
rising
= 1.2V, V
= 1mA, V
= 0V
= –1 A
SENSEP
SENSEP
SENSEN
SENSEP
REMOTE
= 3mA
FB
CC
= –10 A
= –1mA
= –10 A
= –1mA
= 3mA
= 1V
= 1V
= 1V
= 1V
denotes the specifications which apply over the full operating
= 3mA
= –3mA
< 1mA
= 5V unless otherwise noted.
= V
GATE
GATE
GATE
CC
CC
CC
< V
< 1V
< V
CC
< V
Note 3: The GATE pin is internally limited to a minimum of 11.5V. Driving
this pin to voltages beyond the clamp may damage the part.
< V
CC,
= 0V, No Faults
= 5V, No Faults
= 5V,
/2, I
= 5.5V
= 5.5V
= 2.3
CC
CC
CC
CC
V
RAMPBUF
CC
= 5.5V
= 0A
1.214
0.78
0.78
MIN
–30
–35
0.3
1.6
1.1
1.1
0.8
1.1
–7
30
40
30
–1
–1
–7
–5
–8
5
7
5
1
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1.232
1.23
1.23
1.23
TYP
–10
100
–50
–10
–10
–10
5.5
0.4
0.2
0.2
0.2
0.8
0.8
2.1
25
10
20
75
50
50
90
15
0
5
5
0
0
0
0
2
LTC2925
1.250
MAX
0.82
0.82
–13
150
150
200
–65
–13
–15
–14
0.5
0.4
0.4
0.4
2.5
1.4
1.4
1.4
1.4
13
50
100
60
70
10
10
30
30
6
10
3
1
5
5
UNITS
3
2925f
mV
mA
mV
mV
mV
mV
mV
mV
nA
nA
%
%
V
V
A
A
V
A
A
V
V
V
A
V
V
V
A
A
V
A
V
A
V
A
V