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| 型号： | LTC1266IS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 400kHz |
| 占空比： | 100% |
| 电源电压： | 3.5 V ~ 18 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC1266
LTC1266-3.3/LTC1266-5
Synchronous Regulator
Controller for
N- or P-Channel MOSFETs
FEATURES
DESCRIPTIO
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Ultrahigh Efficiency: Over 95% Possible
Drives N-Channel MOSFET for High Current or
P-Channel MOSFET for Low Dropout
Pin Selectable Burst Mode Operation
1% Output Accuracy (LTC1266A)
Pin Selectable Phase of Topside Driver for Boost
or Step-Down Operation
Wide V IN Range: 3.5V to 20V
On-Chip Low-Battery Detector
High Efficiency Maintained Over Large Current Range
Low 170 μ A Standby Current at Light Loads
Current Mode Operation for Excellent Line and Load
Transient Response
Logic Controlled Micropower Shutdown: I Q < 40 μ A
Short-Circuit Protection
Synchronous Switching with Nonoverlaping Gate Drives
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
Notebook and Palmtop Computers
Portable Instruments
APPLICATIO S
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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.
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Cellular Telephones
DC Power Distribution Systems
GPS Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
D2
MBR0530T1
LTC1266-3.3 Efficiency
V IN
4V TO 9V
+
C IN
100 μ F
× 2
V IN
PWR V IN
C B
0.1 μ F
LOW BAT OUT
100k
100
V IN = 5V
LOW BAT IN
LB IN
LB OUT
95
470 ?
C C
SHDN
SENSE
SENSE –
R SENSE
0V = NORMAL
>1.5V = SHUTDOWN
R C
C T
180pF
3300pF
PINV TDRIVE
LTC1266-3.3
I TH
C T
BINH BDRIVE
SGND PGND
+
1000pF
N-CHANNEL
Si9410
N-CHANNEL
Si9410
L*
5 μ H 0.02 ?
D1
MBRS130LT3
+
V OUT
3.3V
5A
C OUT
330 μ F
× 2
90
85
1266 TA01
*TOKO 919AS-4R7M
80
0.01
0.1
1
5
LOAD CURRENT (A)
Figure 1. High Efficiency Step-Down Converter
1266 TA02
1
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