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參數(shù)資料
| 型號： | LTC1267- ADJ5 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 射頻放大器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 282K |
| 代理商： | LTC1267- ADJ5 |
1
LTC1267
LTC1267-ADJ/LTC1267-ADJ5
Dual High Efficiency
Synchronous Step-Down
Switching Regulators
U
ESCRIPTIO
The LTC
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.
Figure 1. High Efficiency Dual 3.3V, 5V
S
FEATURE
D
I
Dual Outputs: 3.3V and 5V, Two Adjustables or
Adjustable and 5V
I
Wide V
IN
Range: 4V to 40V
I
Ultra-High Efficiency: Up to 95%
I
Low Supply Current in Shutdown: 20
μ
A
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
High Efficiency Maintained Over a Wide Output
Current Range
I
Independent Micropower Shutdown
I
Very Low Dropout Operation: 100% Duty Cycle
I
Synchronous FET Switching for High Efficiency
I
Available in Standard 28-Pin SSOP
I
Notebook and Palmtop Computers
I
Battery-Operated Digital Devices
I
Portable Instruments
I
DC Power Distribution Systems
U
S
A
O
PPLICATI
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode
is a trademark of Linear Technology Corporation.
U
A
O
PPLICATI
TYPICAL
1000pF
+
+
+
1000pF
PGATE 3
PDRIVE 3
SENSE
+
3
SENSE
–
3
SHDN3
NGATE 3
SENSE
–
5
SHDN5
NGATE 5
PDRIVE 5
SENSE
+
5
PGND3 SGND3 C
T3
7
I
TH3
I
TH5
C
T5
SGND5 PGND5
20
PGATE 5
V
CC3
V
CC
V
IN
CAP3
CAP5
MSHDN
V
CC5
EXT V
CC
LTC1267
C
270pF
11
9
10
15
16
22
R
C5
1k
C
3300pF
C
3300pF
C
270pF
R
C3
1k
1
3
0.15
μ
F
0.15
μ
F
8
1N4148
26
27
2
21
28
25
24
18
17
19
23
4
5
14
13
12
6
V
OUT5
5V
2A
C
OUT5
220
μ
F
10V
×
2
R
0.05
P-CH
Si9435DY
L5
33
μ
H
D5
MBRS140T3
N-CH
Si9410DY
C
IN5
100
μ
F
50V
+
3.3
μ
F
0.1
μ
F
0.1
μ
F
C
IN3
100
μ
F
50V
P-CH
Si9435DY
L3
20
μ
H
N-CH
Si9410DY
D3
MBRS140T3
C
OUT3
220
μ
F
10V
×
2
R
0.05
V
OUT3
2A
V
5.4V to 25V
R
: KRL SL-1R050J
L3: COILTRONICS CTX20-4
R
: KRL SL-1R050J
L5: COILTRONICS CTX33-4
SHDN3, SHDN5, MSHDN
0V = NORMAL, >2V = SHDN
LTC1267 F01
+
3.3
μ
F
+
1N4148
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1267-ADJ5 | Circular Connector; No. of Contacts:37; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-35 |
| LTC1267-ADJ | XTAL MTL T/H HC49/US |
| LTC1267CG | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1267 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1267CG-ADJ5 | Circular Connector; No. of Contacts:37; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-35 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1267CG-ADJ | 制造商:Linear Technology 功能描述:Dual High Efficiency Synchronous Step-Down Switching Regulators |
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