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LTC7813 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC7813
Description  Low IQ, 60V, High Frequency Synchronous Step-Down Controller
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC7813 Datasheet(HTML) 5 Page - Linear Technology

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LTC7800
5
7800f
For more information www.linear.com/LTC7800
TYPICAL PERFORMANCE CHARACTERISTICS
FCM LOSS
BURST EFFICIENCY
VIN = 12V
VOUT = 3.3V
PULSE-SKIPPING
LOSS
BURST
LOSS
FCM EFFICIENCY
PULSE–SKIPPING
EFFICIENCY
0.0001
0.001
0.01
0.1
1
10
0
10
20
30
40
50
60
70
80
90
100
0.0001
0.001
0.01
0.1
1
10
OUTPUT CURRENT (A)
FIGURE 11 CIRCUIT
7800 G01
VOUT = 5V
VOUT = 3.3V
Burst Mode OPERATION
VIN = 12V
0.0001
0.001
0.01
0.1
1
10
0
10
20
30
40
50
60
70
80
90
100
OUTPUT CURRENT (A)
7800 G02
FIGURES 11, 12 CIRCUITS
ILOAD = 5A
VOUT = 5V
VOUT = 3.3V
5
10
15
20
25
30
35
75
80
85
90
95
100
7800 G03
INPUT VOLTAGE (V)
FIGURES 11, 12 CIRCUITS
Efficiency and Power Loss vs
Output Current
Efficiency vs Output Current
Efficiency vs Input Voltage
ELECTRICAL CHARACTERISTICS
Note 4: The LTC7800 is tested in a feedback loop that servos VITH to a
specified voltage and measures the resultant VFB. The specification at 85°C
is not tested in production and is assured by design, characterization and
correlation to production testing at other temperatures (125°C for the
LTC7800E/LTC7800I and 150°C for the LTC7800H.)
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: Do not apply a voltage or current source to these pins. They must
be connected to capacitive loads only, otherwise permanent damage may
occur.
Load Step
Burst Mode Operation
Load Step
Forced Continuous Mode
Load Step
Pulse-Skipping Mode
LOAD STEP = 500mA TO 5A
VIN = 12V
VOUT = 3.3V
FIGURE 11 CIRCUIT
20µs/DIV
7800 G04
VOUT
100mV/DIV
AC-
COUPLED
IL
5A/DIV
LOAD STEP = 500mA TO 5A
VIN = 12V
VOUT = 3.3V
FIGURE 11 CIRCUIT
20µs/DIV
7800 G05
VOUT
100mV/DIV
AC-
COUPLED
IL
5A/DIV
LOAD STEP = 500mA TO 5A
VIN = 12V
VOUT = 3.3V
FIGURE 11 CIRCUIT
50µs/DIV
7800 G06
VOUT
100mV/DIV
AC-
COUPLED
IL
5A/DIV



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