LTC1876
4
1876fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
3.3V Linear Regulator
V
3.3OUT
3.3V Regulator Output Voltage No Load ● 3.25 3.35 3.45 V
V
3.3IL
3.3V Regulator Load Regulation I
3.3
= 0mA to 10mA 0.5 2 %
V
3.3VL
3.3V Regulator Line Regulation 6V < V
IN
< 30V 0.05 0.2 %
PGOOD Output
V
PGL
PGOOD Voltage Low I
PGOOD
= 2mA 0.1 0.3 V
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V ±1 µA
V
PG
PGOOD Trip Level, Either Controller V
OSENSE
with Respect to Set Output Voltage
V
OSENSE
Ramping Negative –6 –7.5 –9.5 %
V
OSENSE
Ramping Positive 6 7.5 9.5 %
Aux Output
AUXV
INMIN
AUX Minimum Operating Voltage ● 2.4 2.6 V
AUXV
FB
AUX Regulated Feedback Voltage ● 1.23 1.26 1.28 V
AUXI
FB
AUX Feedback Pin Bias Current ● 120 360 nA
AUXI
Q
AUX Input DC Supply Current
Normal Mode V
AUXSD
= 2.4V, Not Switching 4 mA
Shutdown V
AUXSD
= 0V 0.01 1 µA
AUXV
LINEREG
AUX Line Regulation 2.6V ≤ AUXV
IN
≤ 16V 0.01 0.05 %/V
AUXf
OSC
AUX Oscillator Frequency ● 0.8 1.2 1.6 MHz
AUXDC
MAX
AUX Oscillator Maximum Duty Cycle ● 84 86 %
AUXI
LIMIT
AUX Switch Current Limit (Note 9) 1 1.4 2 A
AUXV
CESAT
AUX Switch Saturation Voltage I
SW
= 900mA (Note 10) 330 550 mV
AUXI
LEAKAGE
AUX Switch Leakage Current V
SW
= 5V 0.01 1 µA
AUXV
AUXSD
AUX Shutdown Input Voltage
AUX Shutdown Upper Trip Point 2.4 V
AUX Shutdown Lower Trip Point 0.5 V
I
AUXSD
AUXSD Pin Bias Current
V
AUXSD
= 3V 16 32 µA
V
AUXSD
= 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: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
LTC1876EG: T
J
= T
A
+ (P
D
• 95°C/W)
Note 4: The LTC1876 is tested in a feedback loop that servos V
ITH1, 2
to a
specified voltage and measures the resultant V
OSENSE1, 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 I
MAX
(see Minimum On-Time
Considerations in the Applications Information section).
Note 8: V
FREQSET
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 ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
RUN/SS1, 2
= 5V, AUXV
IN
= 3V unless otherwise noted.
