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參數資料
| 型號： | LTC1266-3.3 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Synchronous Switching Regulator Controller for N- or P-Channel MOSFETs(3.3V,同步穩壓控制器(用于N或P溝道MOS場效應管)) |
| 中文描述： | 同步開關穩壓控制器或P溝道MOSFET（3.3伏，同步穩壓控制器（用于?馬鞍山或P溝道場效應管）的N） |
| 文件頁數： | 1/20頁 |
| 文件大?。?/td> | 245K |
| 代理商： | LTC1266-3.3 |
1
LTC1266
LTC1266-3.3/LTC1266-5
Synchronous Regulator
Controller for
N- or P-Channel MOSFETs
I
Ultrahigh Efficiency: Over 95% Possible
I
Drives N-Channel MOSFET for High Current or
P-Channel MOSFET for Low Dropout
I
Pin Selectable Burst Mode Operation
I
1% Output Accuracy (LTC1266A)
I
Pin Selectable Phase of Topside Driver for Boost
or Step-Down Operation
I
Wide V
IN
Range: 3.5V to 20V
I
On-Chip Low-Battery Detector
I
High Efficiency Maintained Over Large Current Range
I
Low 170
μ
A Standby Current at Light Loads
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Logic Controlled Micropower Shutdown: I
Q
< 40
μ
A
I
Short-Circuit Protection
I
Synchronous Switching with Nonoverlaping Gate Drives
I
Available in 16-Pin Narrow SO Package
The LTC
1266 series is a family of synchronous switching
regulator controllers featuring automatic Burst Mode
TM
operation to maintain high efficiencies at low output
currents. These devices drive external power MOSFETs at
switching frequencies up to 400kHz using a constant off-
time current mode architecture providing constant ripple
current in the inductor. They can drive either an N-channel
or a P-channel topside MOSFET.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V to 18V (20V maximum).
Constant off-time architecture provides low dropout regu-
lation limited only by the R
DS(ON)
of the topside MOSFET
(when using the P-channel) and the resistance of the
inductor and current sense resistor.
The LTC1266 series combines synchronous switching for
maximum efficiency at high currents with an automatic
low current operating mode, called Burst Mode
operation,
which reduces switching losses. Standby power is re-
duced to only 1mW at V
IN
= 5V (at I
OUT
= 0). Load currents
in Burst Mode
operation are typically 0mA to 500mA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
Figure 1. High Efficiency Step-Down Converter
LTC1266-3.3 Efficiency
LOAD CURRENT (A)
0.01
80
E
85
90
95
100
0.1
5
1
1266 TA02
V
IN
= 5V
0V = NORMAL
>1.5V = SHUTDOWN
N-CHANNEL
Si9410
+
C
IN
100
μ
F
×
2
L*
5
μ
H
D2
MBR0530T1
R
0.02
100k
V
3.3V
5A
LOW BAT OUT
V
IN
4V TO 9V
I
TH
C
T
BINH
SGND
C
180pF
C
3300pF
R
C
470
+
C
OUT
330
μ
F
×
2
D1
MBRS130LT3
1266 TA01
BDRIVE
PGND
N-CHANNEL
Si9410
V
IN
PWR V
IN
LB
OUT
LB
IN
PINV
LTC1266-3.3
SHDN
SENSE
+
TDRIVE
SENSE
–
1000pF
C
B
0.1
μ
F
*TOKO 919AS-4R7M
LOW BAT IN
I
Notebook and Palmtop Computers
I
Portable Instruments
I
Cellular Telephones
I
DC Power Distribution Systems
I
GPS Systems
FEATURES
DESCRIPTIOU
APPLICATIU
TYPICAL APPLICATIO
U
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