LTC2927CDDB Ver la hoja de datos (PDF) - Linear Technology
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LTC2927CDDB Datasheet PDF : 16 Pages
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LTC2927
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. 2.9V < VCC < 5.5V unless otherwise noted (Note 2).
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC
Supply Voltage
l 2.9
5.5
V
ICC
Supply Current
IFB = 0mA, ITRACK = 0mA
l 0.25 0.56
1.2
mA
IFB = –1mA, ITRACK = –1mA, IRAMPBUF = –1mA l
3
3.6
4.2
mA
VCC(UVLO)
Supply Undervoltage Lockout
VCC Rising
l 2.2
2.5
2.7
V
ΔVCC(UVHYST) Supply Undervoltage Lockout Hysteresis
25
mV
VON(TH)
ON Pin Threshold Voltage
VON Rising
l 1.210 1.230 1.250
V
ΔVON(HYST) ON Pin Hysteresis
l 30
75
150
mV
ION
ON Pin Input Current
VON = 1.2V, VCC = 5.5V
l
0
±100
nA
IRAMP
RAMP Pin Input Current
0V < VRAMP < VCC, Ramp On
–9
–10
–11
μA
0V < VRAMP < VCC, Ramp Off
9
10
11
μA
VRAMPBUF(OL) RAMPBUF Output Low Voltage
IRAMPBUF = 1mA
l
20
100
mV
VRAMPBUF(OH) RAMPBUF Output High Voltage,
VRAMPBUF(OH) = VCC – VRAMPBUF
IRAMPBUF = –1mA
l
45
150
mV
VOS
Ramp Buffer Offset,
VOS = VRAMPBUF – VRAMP
VRAMP = VCC/2, IRAMPBUF = 0mA
–30
0
30
mV
IERROR(%)
IFB to ITRACK Current Mismatch
ITRACK = –10μA
l
0
±5
%
IERROR(%) = (IFB – ITRACK)/ITRACK
ITRACK = –1mA
l
0
±5
%
VTRACK
TRACK Pin Voltage
ITRACK = –10μA
l 0.77 0.800 0.82
V
ITRACK = –1mA
l 0.77 0.800 0.82
V
IFB(LEAK)
FB Pin Leakage Current
VFB = 2V, VCC = 5.5V
l
±1
±100
nA
VFB(CLAMP)
VSDO(OL)
FB Pin Clamp Voltage
SDO Output Low Voltage
1μA < IFB < 1mA
ISDO = 1mA, VCC = 2.3V
l 1.5
2
2.3
V
l
0.1
0.4
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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.
TYPICAL PERFORMANCE CHARACTERISTICS
ICC vs VCC
750
ITRACK = IFB = 0mA
IRAMBUF = 0mA
700
ICC vs VCC
4.70
ITRACK = IFB = –1mA
IRAMBUF = –2mA
4.65
650
4.60
600
4.55
550
500
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VCC (V)
2927 G01
4.50
4.45
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VCC (V)
2927 G02
VTRACK vs Temperature
820
810
800
790
780
770
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
2927 G03
2927fb
3
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