データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

LTC3822-1 データシート(PDF) 6 Page - Linear Technology

部品番号 LTC3822-1
部品情報  No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LTC3822-1 データシート(HTML) 6 Page - Linear Technology

Back Button LTC3822-1 Datasheet HTML 2Page - Linear Technology LTC3822-1 Datasheet HTML 3Page - Linear Technology LTC3822-1 Datasheet HTML 4Page - Linear Technology LTC3822-1 Datasheet HTML 5Page - Linear Technology LTC3822-1 Datasheet HTML 6Page - Linear Technology LTC3822-1 Datasheet HTML 7Page - Linear Technology LTC3822-1 Datasheet HTML 8Page - Linear Technology LTC3822-1 Datasheet HTML 9Page - Linear Technology LTC3822-1 Datasheet HTML 10Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 24 page
background image
LTC3822-1
6
38221f
PIN FUNCTIONS
PLLLPF (Pin 1/Pin 2): This pin serves as the frequency
select input and PLL lowpass filter compensation point.
When SYNC/MODE has a DC voltage on it, tying this pin
to GND selects 300kHz operation; tying this pin to VIN
selects 750kHz operation. Floating this pin selects 550kHz
operation. When SYNC/MODE has a clock applied to it,
connect an R-C network from this pin to ground.
SYNC/MODE (Pin 2/Pin 3): This pin performs two func-
tions: 1) external clock synchronization input for phase-
locked loop and 2) Burst Mode, pulse skipping or forced
continuous mode select. Applying a clock with frequency
between 250kHz and 750kHz causes the internal oscilla-
tor to phase-lock to the external clock and disables Burst
Mode operation, but allows pulse skipping at low load
currents.
To select Burst Mode operation at light loads, tie this
pin to VIN. Grounding this pin selects forced continuous
operation, which allows the inductor current to reverse.
Tying this pin to a voltage greater than 0.4V and less than
1.2V selects pulse skipping mode. In these cases, the
frequency of the internal oscillator is set by the voltage
on the PLLLPF pin.
TRACK/SS (Pin 3/Pin 5): Tracking Input for the Control-
ler or Optional External Soft-Start Input. This pin allows
the start-up of VOUT to “track” the external voltage at this
pin using an external resistor divider. The LTC3822-1
regulates the VFB voltage to the smaller of 0.6V or the
voltage on the TRACK/SS pin. An internal 1µA pull-up
current source is connected to this pin. Tying this pin to
VIN allows VOUT start-up with the internal 1ms soft-start
clamp. An external soft-start can be programmed by con-
necting a capacitor between this pin and ground. Do not
leave this pin floating.
VFB (Pin 4/Pin 6): Feedback Pin. This pin receives the
remotely sensed feedback voltage for the controller from
an external resistor divider across the output.
ITH (Pin 5/Pin 7): Current Threshold and Error Amplifier
Compensation Point. Nominal operating range on this pin
is from 0.7V to 2V. The voltage on this pin determines the
threshold of the main current comparator.
RUN (Pin 6/Pin 8): Run Control Input. Forcing this pin
below 1.1V shuts down the chip. Driving this pin to VIN
or releasing this pin enables the chip to start-up.
IPRG (Pin 7/Pin 10): Three-State Pin to Select the Maxi-
mum Peak Sense Voltage Threshold. This pin selects the
maximum allowed voltage drop between the VIN and SW
pins (i.e., the maximum allowed drop across the external
topside MOSFET). Tie to VIN, GND or float to select 200mV,
82mV or 125mV respectively.
(DD/GN)
TYPICAL PERFORMANCE CHARACTERISTICS T
A = 25°C unless otherwise noted.
Pulse Skip Mode Operation
Burst Mode Operation
VOUT
20mV/DIV
AC COUPLED
IL
2A/DIV
VSW
2V/DIV
FIGURE 10 CIRCUIT
VIN = 3.3V
VOUT = 1.8V, 100mA
2
µs/DIV
38221 G18
VOUT
20mV/DIV
AC COUPLED
IL
2A/DIV
VSW
2V/DIV
FIGURE 10 CIRCUIT
VIN = 3.3V
VOUT = 1.8V, 100mA
10
µs/DIV
38221 G19


同様の部品番号 - LTC3822-1

メーカー部品番号データシート部品情報
logo
Linear Technology
LTC3822-1 LINER-LTC3822-1 Datasheet
424Kb / 32P
   Low Input Voltage, Synchronous Step-Down DC/DC Controller
LTC3822-1 LINER-LTC3822-1_15 Datasheet
385Kb / 24P
   No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller
More results

同様の説明 - LTC3822-1

メーカー部品番号データシート部品情報
logo
Linear Technology
LTC3822-1 LINER-LTC3822-1_15 Datasheet
385Kb / 24P
   No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller
LTC3822 LINER-LTC3822 Datasheet
237Kb / 20P
   No RSENSETM, Low Input Voltage, Synchronous Step-Down DC/DC Controller
LTC1700 LINER-LTC1700_15 Datasheet
206Kb / 16P
   No RSENSE Synchronous Step-Up DC/DC Controller
LTC1700 LINER-LTC1700 Datasheet
194Kb / 16P
   No RSENSE Synchronous Step-Up DC/DC Controller
LTC3852 LINER-LTC3852_15 Datasheet
424Kb / 32P
   Low Input Voltage, Synchronous Step-Down DC/DC Controller
LTC3852 LINER-LTC3852 Datasheet
424Kb / 32P
   Low Input Voltage, Synchronous Step-Down DC/DC Controller
LTC3809-1 LINER-LTC3809-1_15 Datasheet
266Kb / 24P
   No RSENSE, Low Input Voltage, Synchronous DC/DC Controller with Output Tracking
LTC3713 LINER-LTC3713 Datasheet
325Kb / 24P
   Low Input Voltage, High Power, No RSENSE Synchronous Buck DC/DC Controller
LTC3713 LINER-LTC3713_15 Datasheet
290Kb / 24P
   Low Input Voltage, High Power, No RSENSE Synchronous Buck DC/DC Controller
LTC3809 LINER-LTC3809 Datasheet
291Kb / 24P
   No RSENSE?? Low EMI, Synchronous DC/DC Controller
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com