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LTC1265CS-5 Datasheet

  • LTC1265CS-5

  • 1.2A, High Efficiency Step-Down DC/DC Converter

  • 230.00KB

  • 16頁(yè)

  • LINER

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LTC1265/LTC1265-3.3/LTC1265-5
1.2A, High Efficiency
Step-Down DC/DC Converter
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
High Efficiency: Up to 95%
Current Mode Operation for Excellent Line and Load
Transient Response
Internal 0.3
鈩?/div>
Power Switch (V
IN
= 10V)
Short-Circuit Protection
Low Dropout Operation: 100% Duty Cycle
Low-Battery Detector
Low 160碌A(chǔ) Standby Current at Light Loads
Active-High Micropower Shutdown: I
Q
< 15碌A(chǔ)
Peak Inductor Current Independent of Inductor Value
Available in 14-pin SO Package
The LTC
廬
1265 is a monolithic step-down current mode
DC/DC converter featuring Burst Mode
TM
operation at low
output current. The LTC1265 incorporates a 0.3鈩?switch
(V
IN
=10V) allowing up to 1.2A of output current.
Under no load condition, the converter draws only 160碌A(chǔ).
In shutdown it typically draws a mere 5碌A(chǔ) making this
converter ideal for current sensitive applications. In drop-
out the internal P-channel MOSFET switch is turned on
continuously maximizing the life of the battery source. The
LTC1265 incorporates automatic power saving Burst Mode
operation to reduce gate charge losses when the load
currents drop below the level required for continuous
operation.
The inductor current is user-programmable via an external
current sense resistor. Operation up to 700kHz permits
the use of small surface mount inductors and capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
s
s
5V to 3.3V Conversion
Distributed Power Systems
Step-Down Converters
Inverting Converters
Memory Backup Supply
Portable Instruments
Battery-Powered Equipment
Cellular Telephones
TYPICAL APPLICATIO
V
IN
5.4V TO
12V
+
C
IN
鈥犫€犫€?/div>
68碌F
20V
0.1碌F
PWR V
IN
SHDN
V
IN
SW
L1*
33碌H
D1
鈥?/div>
R
SENSE
**
0.1鈩?/div>
1k
LTC1265-5
I
TH
C
T
PGND
SENSE
+
V
OUT
5V
1A
EFFICIENCY (%)
+
C
OUT
鈥犫€?/div>
220碌F
10V
3900pF
130pF
1000pF
SENSE
鈥?/div>
SGND
* COILTRONICS CTX33-4
** IRC LRC2010-01-R100-J
鈥?/div>
MBRS130LT3
鈥犫€?/div>
AVX TPSE227K010
鈥犫€犫€?/div>
AVX TPSE686K020
LTC1265-FO1
Figure 1. High Efficiency Step-Down Converter
U
LTC1265-5 Efficiency
100
95
90
V
IN
= 12V
85
80
75
70
0.01
L = 33碌H
V
OUT
= 5V
R
SENSE
= 0.1鈩?/div>
C
T
= 130pF
0.10
LOAD CURRENT (A)
1.00
LTC1265 TA01
U
U
V
IN
= 6V
V
IN
= 9V
1

LTC1265CS-5 產(chǎn)品屬性

  • LTC1265/-3.3/-5

  • 55

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓）

  • 固定

  • 1

  • 5V

  • 3.5 V ~ 12 V

  • 電流模式，混合

  • 最高 700kHz

  • 1.2A

  • 無(wú)

  • 0°C ~ 70°C

  • 表面貼裝

  • 14-SOIC（0.154"，3.90mm 寬）

  • 管件

  • 14-SOIC

LTC1265CS-5相關(guān)型號(hào)PDF文件下載

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