LTC1267-ADJ Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
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Fabricante
LTC1267-ADJ Datasheet PDF : 16 Pages
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LTC1267
LTC1267-ADJ/LTC1267-ADJ5
TYPICAL PERFORMANCE CHARACTERISTICS
5V Output Efficiency
vs Line Voltage
100
95
LOGIC THRESHOLD
GATE, 1A
90
NOTE 6
85
LOGIC
80 THRESHOLD
GATE, 0.1A
75
STANDARD
THRESHOLD GATE, 1A
70
VEXTVCC = 9V
STANDARD
65
THRESHOLD GATE, 0.1A
VEXTVCC = 9V
60
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
LTC1267 • G04
Operating Frequency
vs (VIN – VOUT)
2.0
VOUT = 5V
ILOAD = 700mA
1.5
0°C
25°C
70°C
1.0
0.5
0
0
5
10
15
20
25
(VIN – VOUT) VOLTAGE (V)
LTC1267 • G07
3.3V Output Efficiency
vs Line Voltage
100
95
LOGIC THRESHOLD
GATE, 1A
90
NOTE 6
85
80
LOGIC
THRESHOLD
75 GATE, 0.1A
STANDARD
70 THRESHOLD GATE, 1A
VEXTVCC = 9V
STANDARD
65
THRESHOLD GATE, 0.1A
VEXTVCC = 9V
60
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
LTC1267 • G05
Off-Time vs Output Voltage
160
140
120
100
80
60
3.3V OUTPUT REGULATOR
40
5V OUTPUT REGULATOR
20
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT VOLTAGE (V)
LTC1267 • F08
Line Regulation
60
40
NOTE 6
20
0
– 20
– 40
–60
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
LT1267 • G06
Current Sense Threshold Voltage
180
160
140
MAXIMUM THRESHOLD
120
100
80
60
40
MINIMUM THRESHOLD
20
0
0 10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
LTC1267 • G09
PI FU CTIO S (Applies to both regulator sections)
VIN: Main Supply Input Pin.
EXT VCC: External VCC Supply for the Regulators. See EXT
VCC Pin Connection.
VCC: Output of the Internal 4.5V Linear Regulator, EXT VCC
Switch, and Supply Inputs for Driver and Control Circuits.
The driver and control circuits are powered from the
higher of the 4.5V regulator or EXT VCC voltage. Must be
closely decoupled to the power ground.
PGND: Power Ground. Connect to the source of N-channel
MOSFET and the (–) terminal of CIN.
SGND: Small-Signal Ground. Must be routed separately
from other grounds to the (–) terminal of COUT.
PGATE: Level Shifted Gate Drive for the Top P-channel
MOSFET. The voltage swing at the PGate pin is from VIN to
(VIN – VCC).
PDRIVE: High Current Gate Drive for the Top P-channel
MOSFET. The PDrive pin swings from VCC to GND.
NGATE: High Current Drive for the Bottom N-channel
MOSFET. The NGate pin swings from GND to VCC.
5
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