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LTC1877 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC1877
Description  High Efficiency Monolithic Synchronous Step-Down Regulator
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1877 Datasheet(HTML) 3 Page - Linear Technology

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LTC1877
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1877 is guaranteed to meet specified performance 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.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IPK
Peak Inductor Current
VFB = 0.7V, Duty Cycle < 35%
0.8
1.0
1.25
A
ILSW
SW Leakage
VRUN = 0V, VSW = 0V or 8.5V, VIN = 8.5V
±0.01
±1
µA
VSYNC/MODE SYNC/MODE Threshold
q
0.2
1.0
1.5
V
ISYNC/MODE
SYNC/MODE Leakage Current
±0.01
±1
µA
VRUN
RUN Threshold
q
0.2
0.7
1.5
V
IRUN
RUN Input Current
±0.01
±1
µA
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 5V unless otherwise specified.
ELECTRICAL CHARACTERISTICS
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1877EMS8: TJ = TA + (PD)(150°C/W)
Note 4: The LTC1877 is tested in a feedback loop which servos VFB to the
balance point for the error amplifier (VITH = 1.2V).
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Input Voltage
Efficiency vs Output Current
Efficiency vs Output Current
OUTPUT CURRENT (mA)
0.1
10
1000
95
90
85
80
75
70
65
60
55
1877 • G03
1.0
100
L = 15
µH
L = 10
µH
VIN = 10V
VOUT = 3.3V
Burst Mode OPERATION
INPUT VOLTAGE (V)
0
2
4
68
1877 • G01
10
100
95
90
85
80
75
70
65
60
55
50
12
VOUT = 2.5V
L = 10
µH
Burst Mode OPERATION
ILOAD = 0.1mA
ILOAD = 1mA
ILOAD = 300mA
ILOAD = 100mA I
LOAD = 10mA
OUTPUT CURRENT (mA)
0.1
10
1000
1877 • G02
1.0
100
VIN = 3.6V
VIN = 7.2V
VIN = 3.6V
VIN = 7.2V
100
90
80
70
60
50
40
30
20
10
0
VOUT = 2.5V
L = 10
µH
PULSE SKIPPING MODE
Burst Mode OPERATION



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