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LTC1267 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC1267
Description  Dual High Efficiency Synchronous Step-Down Switching Regulators
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1267 Datasheet(HTML) 5 Page - Linear Technology

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LTC1267
LTC1267-ADJ/LTC1267-ADJ5
TYPICAL PERFORMANCE CHARACTERISTICS
5V Output Efficiency
vs Line Voltage
Line Regulation
3.3V Output Efficiency
vs Line Voltage
INPUT VOLTAGE (V)
0
80
85
90
40
LTC1267 • G04
75
70
60
10
20
30
65
100
95
5
15
25
35
LOGIC THRESHOLD
GATE, 1A
STANDARD
THRESHOLD GATE, 1A
VEXTVCC = 9V
LOGIC
THRESHOLD
GATE, 0.1A
STANDARD
THRESHOLD GATE, 0.1A
VEXTVCC = 9V
NOTE 6
INPUT VOLTAGE (V)
0
80
85
90
40
LTC1267 • G05
75
70
60
10
20
30
65
100
95
5
15
25
35
LOGIC THRESHOLD
GATE, 1A
STANDARD
THRESHOLD GATE, 1A
VEXTVCC = 9V
LOGIC
THRESHOLD
GATE, 0.1A
STANDARD
THRESHOLD GATE, 0.1A
VEXTVCC = 9V
NOTE 6
INPUT VOLTAGE (V)
0
–60
–40
–20
0
20
10
20
30
40
LT1267 • G06
40
60
515
25
35
NOTE 6
Operating Frequency
vs (VIN – VOUT)
Current Sense Threshold Voltage
(VIN – VOUT) VOLTAGE (V)
0
1.0
1.5
20
LTC1267 • G07
0.5
0
5
10
15
25
2.0
0
°C
25
°C
VOUT = 5V
ILOAD = 700mA
70
°C
Off-Time vs Output Voltage
OUTPUT VOLTAGE (V)
0
120
160
4.0
LTC1267 • F08
80
40
100
140
60
20
0
1.0
2.0
3.0
0.5
4.5
1.5
2.5
3.5
5.0
3.3V OUTPUT REGULATOR
5V OUTPUT REGULATOR
TEMPERATURE (
°C)
0
0
20
60
80
100
20
180
LTC1267 • G09
40
10
30 40 50 60 70 80 90 100
120
140
160
MINIMUM THRESHOLD
MAXIMUM THRESHOLD
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.



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