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LTC1876 Datasheet(PDF) 4 Page - Linear Technology

Part No. LTC1876
Description  High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1876 Datasheet(HTML) 4 Page - Linear Technology

 
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LTC1876
4
1876fa
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
3.3V Linear Regulator
V3.3OUT
3.3V Regulator Output Voltage
No Load
q
3.25
3.35
3.45
V
V3.3IL
3.3V Regulator Load Regulation
I3.3 = 0mA to 10mA
0.5
2
%
V3.3VL
3.3V Regulator Line Regulation
6V < VIN < 30V
0.05
0.2
%
PGOOD Output
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.3
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±1
µA
VPG
PGOOD Trip Level, Either Controller
VOSENSE with Respect to Set Output Voltage
VOSENSE Ramping Negative
–6
–7.5
–9.5
%
VOSENSE Ramping Positive
6
7.5
9.5
%
Aux Output
AUXVINMIN
AUX Minimum Operating Voltage
q
2.4
2.6
V
AUXVFB
AUX Regulated Feedback Voltage
q
1.23
1.26
1.28
V
AUXIFB
AUX Feedback Pin Bias Current
q
120
360
nA
AUXIQ
AUX Input DC Supply Current
Normal Mode
VAUXSD = 2.4V, Not Switching
4
mA
Shutdown
VAUXSD = 0V
0.01
1
µA
AUXVLINEREG
AUX Line Regulation
2.6V
≤ AUXVIN ≤ 16V
0.01
0.05
%/V
AUXfOSC
AUX Oscillator Frequency
q
0.8
1.2
1.6
MHz
AUXDCMAX
AUX Oscillator Maximum Duty Cycle
q
84
86
%
AUXILIMIT
AUX Switch Current Limit
(Note 9)
1
1.4
2
A
AUXVCESAT
AUX Switch Saturation Voltage
ISW = 900mA (Note 10)
330
550
mV
AUXILEAKAGE
AUX Switch Leakage Current
VSW = 5V
0.01
1
µA
AUXVAUXSD
AUX Shutdown Input Voltage
AUX Shutdown Upper Trip Point
2.4
V
AUX Shutdown Lower Trip Point
0.5
V
IAUXSD
AUXSD Pin Bias Current
VAUXSD = 3V
16
32
µA
VAUXSD = 0V
0.01
0.1
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1876E is guaranteed to meet performance specifications
from 0
°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1876EG: TJ = TA + (PD • 95°C/W)
Note 4: The LTC1876 is tested in a feedback loop that servos VITH1, 2 to a
specified voltage and measures the resultant VOSENSE1, 2.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels.
Delay times are measured using 50% levels.
Note 7: The minimum on-time condition is specified for an inductor peak-
to-peak ripple current
≥40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 8: VFREQSET pin internally tied to 1.19V reference through a large
resistance.
Note 9: Current limit guaranteed by design and/or correlation to static test.
Note 10: 100% tested at wafer level.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V, AUXVIN = 3V unless otherwise noted.


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