Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

ISL9305IRTWLNCZ-T Datasheet(PDF) 7 Page - Intersil Corporation

Part # ISL9305IRTWLNCZ-T
Description  3MHz Dual Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL9305IRTWLNCZ-T Datasheet(HTML) 7 Page - Intersil Corporation

Back Button ISL9305IRTWLNCZ-T Datasheet HTML 3Page - Intersil Corporation ISL9305IRTWLNCZ-T Datasheet HTML 4Page - Intersil Corporation ISL9305IRTWLNCZ-T Datasheet HTML 5Page - Intersil Corporation ISL9305IRTWLNCZ-T Datasheet HTML 6Page - Intersil Corporation ISL9305IRTWLNCZ-T Datasheet HTML 7Page - Intersil Corporation ISL9305IRTWLNCZ-T Datasheet HTML 8Page - Intersil Corporation ISL9305IRTWLNCZ-T Datasheet HTML 9Page - Intersil Corporation ISL9305IRTWLNCZ-T Datasheet HTML 10Page - Intersil Corporation ISL9305IRTWLNCZ-T Datasheet HTML 11Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 16 page
background image
ISL9305
7
FN7605.2
February 9, 2015
Submit Document Feedback
Theory of Operation
DCD1 and DCD2 Introduction
Both the DCD1 and DCD2 converters on ISL9305 use the
peak-current-mode pulse-width modulation (PWM) control
scheme for fast transient response and pulse-by-pulse current
limiting. Both converters are able to supply up to 800mA load
current. The default output voltage ranges from 0.8V to 3.6V
depending on the factory pre-set configuration and can be
programmed via the I2C interface in the range of 0.825V to 3.6V
at 25mV/step with a programmable slew rate. An open-drain
DCDPG (DCD Power-Good) signal is also provided to monitor the
DCD1 and DCD2 output voltages. Optionally, both DCD1 and
DCD2 can be programmed to be actively discharged via an
on-chip bleeding resistor (typical 115Ω) when the converter is
disabled.
Skip Mode (PFM Mode) for DCD1/DCD2
Under light load condition, the DCD1 and DCD2 can be
programmed to automatically enter a pulse-skipping mode to
minimize the switching loss by reducing the switching frequency.
Figure 2 illustrates the skip mode operation. A zero-cross sensing
circuit monitors the current flowing through the SW node for zero
crossing. When it is detected to cross zero for 16 consecutive
cycles, the regulator enters the skip mode. During the 16
consecutive cycles, the inductor current could be negative. The
counter is reset to zero when the sensed current flowing through
the SW node does not cross zero during any cycle within the 16
consecutive cycles. Once the converter enters the skip mode, the
pulse modulation is controlled by an internal comparator while
each pulse cycle remains synchronized to the PWM clock. The
P-Channel MOSFET is turned on at the rising edge of the clock
and turned off when its current reaches ~20% of the peak
current limit. As the average inductor current in each cycle is
higher than the average current of the load, the output voltage
rises cycle-over-cycle. When the output voltage is sensed to reach
1.5% above its nominal voltage, the P-Channel MOSFET is turned
off immediately and the inductor current is fully discharged to
zero and stays at zero. The output voltage reduces gradually due
to the load current discharging the output capacitor. When the
output voltage drops to the nominal voltage, the P-Channel
MOSFET will be turned on again, repeating the previous
operations.
The regulator resumes normal PWM mode operation when the
output voltage is sensed to drop below 1.5% of its nominal
voltage value as shown in Figure 3.
16 CYCLES
CLOCK
IL
VOUT
0
VOUT_NOMINAL
20% PEAK CURRENT LIMIT
1.015*VOUT_NOMINAL
FIGURE 2. SKIP MODE OPERATION WAVEFORMS
vEAMP
d
iL
vOUT
vCSA
FIGURE 3. PWM OPERATION WAVEFORMS


Similar Part No. - ISL9305IRTWLNCZ-T

ManufacturerPart #DatasheetDescription
logo
Intersil Corporation
ISL9305IRTWLNCZ-T INTERSIL-ISL9305IRTWLNCZ-T Datasheet
784Kb / 17P
   3MHz Dual Step-Down Converters and Dual Low-Input LDOs
ISL9305IRTWLNCZ-T INTERSIL-ISL9305IRTWLNCZ-T Datasheet
777Kb / 17P
   3MHz Dual Step-Down Converters and Dual Low-Input LDOs
logo
Renesas Technology Corp
ISL9305IRTWLNCZ-T RENESAS-ISL9305IRTWLNCZ-T Datasheet
924Kb / 17P
   3MHz Dual Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface
More results

Similar Description - ISL9305IRTWLNCZ-T

ManufacturerPart #DatasheetDescription
logo
Renesas Technology Corp
ISL9305 RENESAS-ISL9305 Datasheet
924Kb / 17P
   3MHz Dual Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface
logo
Intersil Corporation
ISL9305IRTHAANLZ-T INTERSIL-ISL9305IRTHAANLZ-T Datasheet
664Kb / 17P
   3MHz Dual 1.5A Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface
October 5, 2011
ISL9305H INTERSIL-ISL9305H_11 Datasheet
666Kb / 17P
   3MHz Dual 1.5A Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface
logo
Renesas Technology Corp
ISL9305H RENESAS-ISL9305H Datasheet
808Kb / 17P
   3MHz Dual 1.5A Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface
logo
Intersil Corporation
ISL9305H INTERSIL-ISL9305H Datasheet
656Kb / 16P
   3MHz Dual 1.5A Step-Down Converters and Dual Low-Input LDOs with I2C Compatible
ISL9305 INTERSIL-ISL9305_11 Datasheet
777Kb / 17P
   3MHz Dual Step-Down Converters and Dual Low-Input LDOs
ISL9305 INTERSIL-ISL9305 Datasheet
784Kb / 17P
   3MHz Dual Step-Down Converters and Dual Low-Input LDOs
ISL9307IRTAAJBZ-T INTERSIL-ISL9307IRTAAJBZ-T Datasheet
378Kb / 13P
   3MHz Dual 1500mA Step-Down Converters and Dual Low-Input LDOs
September 20, 2012
logo
Renesas Technology Corp
ISL9307 RENESAS-ISL9307 Datasheet
678Kb / 13P
   3MHz Dual 1500mA Step-Down Converters and Dual Low-Input LDOs
logo
Maxim Integrated Produc...
MAX16922 MAXIM-MAX16922 Datasheet
1Mb / 16P
   2.2MHz, Dual, Step-Down DC-DC Converters, Dual LDOs, and RESET
Rev 0; 10/09
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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