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LTC1267-ADJ5 Datasheet

  • LTC1267-ADJ5

  • Dual High Efficiency Synchronous Step-Down Switching Regulat...

  • 16頁

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LTC1267
LTC1267-ADJ/LTC1267-ADJ5
Dual High Efficiency
Synchronous Step-Down
Switching Regulators
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
Dual Outputs: 3.3V and 5V, Two Adjustables or
Adjustable and 5V
Wide V
IN
Range: 4V to 40V
Ultra-High Efficiency: Up to 95%
Low Supply Current in Shutdown: 20
碌
A
Current Mode Operation for Excellent Line and Load
Transient Response
High Efficiency Maintained Over a Wide Output
Current Range
Independent Micropower Shutdown
Very Low Dropout Operation: 100% Duty Cycle
Synchronous FET Switching for High Efficiency
Available in Standard 28-Pin SSOP
The LTC
廬
1267 series are dual synchronous step-down
switching regulator controllers featuring automatic Burst
Mode
TM
operation to maintain high efficiencies at low
output currents. The LTC1267 is composed of two sepa-
rate regulator blocks, each driving a pair of external comple-
mentary power MOSFETs at switching frequencies up to
400kHz. The LTC1267 uses a constant off-time current-
mode architecture to provide constant ripple current in the
inductor and provide excellent line and load transient
response.
A separate pin and on-board switch allow the MOSFET
driver power to be derived from the regulated output
voltage, providing significant efficiency improvement when
operating at high input voltage. The output current level is
user-programmable via an external current sense resistor.
The LTC1267 series is ideal for applications requiring dual
output voltages with high conversion efficiencies over a
wide load current range in a small amount of board space.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATI
s
s
s
s
S
Notebook and Palmtop Computers
Battery-Operated Digital Devices
Portable Instruments
DC Power Distribution Systems
TYPICAL APPLICATI
+
C
IN3
100碌F
50V
V
IN
5.4V to 25V
+
3.3碌F
P-CH
Si9435DY
1N4148
8
4
5
14
1000pF
13
12
SENSE
鈥?/div>
3
SHDN3
NGATE 3
V
CC3
PGATE 3
PDRIVE 3
SENSE
+
3
0.15碌F
3
CAP3
1
V
CC
2
V
IN
0.15碌F
1N4148
27
26
28
21
0.1碌F
P-CH
Si9435DY
V
OUT3
3.3V
2A
R
SENSE3
0.05鈩?/div>
L3
20碌H
0.1碌F
D3
MBRS140T3
6
N-CH
Si9410DY
MSHDN CAP5 EXT V
CC
V
CC5
25
PGATE 5
24
PDRIVE 5
18
SENSE
+
5
LTC1267
17
SENSE
鈥?/div>
5
19
SHDN5
23
NGATE 5
I
TH5
15
C
T5
16
SGND5 PGND5
20
22
+
C
OUT3
220碌F
10V
脳
2
PGND3 SGND3 C
T3
7
11
9
I
TH3
10
N-CH
Si9410DY
C
C3
C
C5
C
T5
C
T3
270pF 3300pF 3300pF 270pF
R
SENSE3
: KRL SL-1R050J
L3: COILTRONICS CTX20-4
R
C3
1k
R
C5
1k
R
SENSE5
: KRL SL-1R050J
L5: COILTRONICS CTX33-4
LTC1267 鈥?F01
SHDN3, SHDN5, MSHDN
0V = NORMAL, >2V = SHDN
Figure 1. High Efficiency Dual 3.3V, 5V
U
+
+
3.3碌F
C
IN5
100碌F
50V
L5
33碌H
R
SENSE5
0.05鈩?/div>
V
OUT5
5V
2A
1000pF
D5
MBRS140T3
UO
UO
+
C
OUT5
220碌F
10V
脳
2
1

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