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LTC1735IGN Datasheet

  • LTC1735IGN

  • High Efficiency Synchronous Step-Down Switching Regulator

  • 375.92KB

  • 32頁

  • LINER

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FEATURES
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s
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LTC1735
High Efficiency
Synchronous Step-Down
Switching Regulator
DESCRIPTIO
The LTC
廬
1735 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using a fixed frequency architecture. Burst
Mode
TM
operation provides high efficiency at low load
currents. The precision 0.8V reference is compatible with
future microprocessor generations. OPTI-LOOP compen-
sation allows the transient response to be optimized over
a wide range of output capacitance and ESR values.
The operating frequency (synchronizable up to 500kHz) is
set by an external capacitor allowing maximum flexibility
in optimizing efficiency. A forced continuous control pin
reduces noise and RF interference and can assist second-
ary winding regulation by disabling Burst Mode operation
when the main output is lightly loaded.
Protection features include internal foldback current lim-
iting, output overvoltage crowbar and optional short-
circuit shutdown. Soft-start is provided by an external
capacitor that can be used to properly sequence supplies.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V to 30V (36V maximum).
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
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Dual N-Channel MOSFET Synchronous Drive
Synchronizable/Programmable Fixed Frequency
Wide V
IN
Range: 3.5V to 36V Operation
V
OUT
Range: 0.8V to 6V
OPTI-LOOP
TM
Compensation Minimizes C
OUT
鹵
1% Output Voltage Accuracy
Internal Current Foldback
Output Overvoltage Crowbar Protection
Latched Short-Circuit Shutdown Timer
with Defeat Option
Very Low Dropout Operation: 99% Duty Cycle
Forced Continuous Control Pin
Optional Programmable Soft-Start
Remote Output Voltage Sense
Logic Controlled Micropower Shutdown: I
Q
< 25碌A(chǔ)
LTC1435 Pin Compatible with
Minor Component Changes
Available in 16-Lead Narrow SSOP and SO Packages
APPLICATIO S
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Notebook and Palmtop Computers, PDAs
Cellular Telephones and Wireless Modems
DC Power Distribution Systems
TYPICAL APPLICATIO
C
OSC
47pF
C
SS
0.1碌F
C
C
330pF
R
C
33k
C
OSC
TG
RUN/SS
BOOST
I
TH
SW
C
C2
100pF
SGND
100pF
V
OSENSE
BG
SENSE
鈥?/div>
1000pF
SENSE
+
PGND
INTV
CC
LTC1735
V
IN
D
B
CMDSH-3
L1
2碌H
C
B
0.22碌F
M1
FDS6680A
C
IN
22碌F
50V
V
IN
5V TO 24V
C
OUT
: PANASONIC EEFUEOG181R
C
IN
: MARCON THCR70E1H226ZT
L1: PANASONIC ETQP6FZR0HFA
R
SENSE
: IRC LRF2010-01-R005J
R
SENSE
0.005鈩?/div>
+
4.7碌F
M2
FDS6680A
D1
MBRS340T3
Figure 1. High Efficiency Step-Down Converter
U
U
U
V
OUT
1.6V
9A
R1
20k
1%
R2
20k
1%
+
C
OUT
180碌F
4V
脳
4
SP
1735 F01
1

LTC1735IGN 產(chǎn)品屬性

  • LTC1735

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 335kHz

  • 99.4%

  • 4 V ~ 30 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 16-SSOP（0.154"，3.90mm 寬）

  • 管件

LTC1735IGN相關(guān)型號PDF文件下載

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    Window Comparator
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    Switched Capacitor Voltage Converter
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    Programmable Micropower Hex Translator/ Receiver/Driver
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    Programmable Micropower Hex Translator/ Receiver/Driver
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    “Inductorless” 5V to + 5V Converter
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