參數(shù)資料
型號： LTC1266IS-5
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, PLASTIC, SO-16
文件頁數(shù)： 1/20頁
文件大小： 240K
代理商： LTC1266IS-5
1
LTC1266
LTC1266-3.3/LTC1266-5
Synchronous Regulator
Controller for
N- or P-Channel MOSFETs
s
Ultrahigh Efficiency: Over 95% Possible
s
Drives N-Channel MOSFET for High Current or
P-Channel MOSFET for Low Dropout
s
Pin Selectable Burst Mode Operation
s
1% Output Accuracy (LTC1266A)
s
Pin Selectable Phase of Topside Driver for Boost
or Step-Down Operation
s
Wide VIN Range: 3.5V to 20V
s
On-Chip Low-Battery Detector
s
High Efficiency Maintained Over Large Current Range
s
Low 170
A Standby Current at Light Loads
s
Current Mode Operation for Excellent Line and Load
Transient Response
s
Logic Controlled Micropower Shutdown: IQ < 40A
s
Short-Circuit Protection
s
Synchronous Switching with Nonoverlaping Gate Drives
s
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 RDS(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 VIN = 5V (at IOUT = 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
EFFICIENCY
(%)
85
90
95
100
0.1
5
1
1266 TA02
VIN = 5V
0V = NORMAL
>1.5V = SHUTDOWN
N-CHANNEL
Si9410
+
CIN
100
F
×2
L*
5
H
D2
MBR0530T1
RSENSE
0.02
100k
VOUT
3.3V
5A
LOW BAT OUT
VIN
4V TO 9V
ITH
CT
SGND
CT
180pF
CC
3300pF
RC
470
+
COUT
330
F
× 2
D1
MBRS130LT3
1266 TA01
BDRIVE
BINH
PGND
N-CHANNEL
Si9410
VIN
PWR VIN
LBOUT
LBIN
PINV
LTC1266-3.3
SHDN
SENSE+
TDRIVE
SENSE–
1000pF
CB
0.1
F
*TOKO 919AS-4R7M
LOW BAT IN
s
Notebook and Palmtop Computers
s
Portable Instruments
s
Cellular Telephones
s
DC Power Distribution Systems
s
GPS Systems
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
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相關代理商/技術參數(shù)
參數(shù)描述
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