Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LMR23630AFDDA Datasheet(PDF) 15 Page - Texas Instruments

Click here to check the latest version.
Part # LMR23630AFDDA
Description  SIMPLE SWITCHER 36-V, 3-A Synchronous Step-Down Converter
Download  42 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMR23630AFDDA Datasheet(HTML) 15 Page - Texas Instruments

Back Button LMR23630AFDDA Datasheet HTML 11Page - Texas Instruments LMR23630AFDDA Datasheet HTML 12Page - Texas Instruments LMR23630AFDDA Datasheet HTML 13Page - Texas Instruments LMR23630AFDDA Datasheet HTML 14Page - Texas Instruments LMR23630AFDDA Datasheet HTML 15Page - Texas Instruments LMR23630AFDDA Datasheet HTML 16Page - Texas Instruments LMR23630AFDDA Datasheet HTML 17Page - Texas Instruments LMR23630AFDDA Datasheet HTML 18Page - Texas Instruments LMR23630AFDDA Datasheet HTML 19Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 15 / 42 page
background image
OUT
IN _ MIN
SW
OFF _ MIN
V
V
1 f
T
u
OUT
IN _ MAX
SW
ON _ MIN
V
V
f
T
u
15
LMR23630
www.ti.com
SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017
Product Folder Links: LMR23630
Submit Documentation Feedback
Copyright © 2015–2017, Texas Instruments Incorporated
Figure 18. Synchronizing in PWM Mode
Figure 19. Synchronizing in PFM Mode
8.3.5 VCC, UVLO
The LMR23630 integrates an internal LDO to generate VCC for control circuitry and MOSFET drivers. The
nominal voltage for VCC is 4.1 V. The VCC pin is the output of an LDO and must be properly bypassed. Place a
high-quality ceramic capacitor with a value of 2.2 µF to 10 µF, 16 V or higher rated voltage as close as possible
to VCC and grounded to the exposed PAD and ground pins. The VCC output pin must not be loaded, or shorted
to ground during operation. Shorting VCC to ground during operation may cause damage to the LMR23630.
VCC undervoltage lockout (UVLO) prevents the LMR23630 from operating until the VCC voltage exceeds 3.3 V
(typical). The VCC UVLO threshold has 400 mV (typical) of hysteresis to prevent undesired shutdown due to
temporary VIN drops.
8.3.6 Minimum ON-time, Minimum OFF-time and Frequency Foldback at Dropout Conditions
Minimum ON-time, TON_MIN, is the smallest duration of time that the HS switch can be on. TON_MIN is typically 60
ns in the LMR23630. Minimum OFF-time, TOFF_MIN, is the smallest duration that the HS switch can be off.
TOFF_MIN is typically 100 ns in the LMR23630. In CCM operation, TON_MIN and TOFF_MIN
limit the voltage
conversion range given a selected switching frequency.
The minimum duty cycle allowed is:
DMIN = TON_MIN × fSW
(3)
And the maximum duty cycle allowed is:
DMAX = 1 – TOFF_MIN × fSW
(4)
Given fixed TON_MIN and TOFF_MIN, the higher the switching frequency the narrower the range of the allowed duty
cycle. In the LMR23630, a frequency foldback scheme is employed to extend the maximum duty cycle when
TOFF_MIN is reached. The switching frequency decreases once longer duty cycle is needed under low VIN
conditions. Wide range of frequency foldback allows the LMR23630 output voltage stay in regulation with a much
lower supply voltage VIN. This leads to a lower effective dropout voltage.
Given an output voltage, the choice of the switching frequency affects the allowed input voltage range, solution
size and efficiency. The maximum operation supply voltage can be found by:
(5)
At lower supply voltage, the switching frequency decreases once TOFF_MIN is tripped. The minimum VIN without
frequency foldback can be approximated by:
(6)
Taking considerations of power losses in the system with heavy load operation, VIN_MAX is higher than the result
calculated in Equation 5. With frequency foldback, VIN_MIN is lowered by decreased fSW.


Similar Part No. - LMR23630AFDDA

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
LMR23630AFDDA TI1-LMR23630AFDDA Datasheet
159Kb / 9P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter
LMR23630AFDDA TI1-LMR23630AFDDA Datasheet
3Mb / 40P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter
LMR23630AFDDAR TI1-LMR23630AFDDAR Datasheet
159Kb / 9P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter
LMR23630AFDDAR TI1-LMR23630AFDDAR Datasheet
3Mb / 40P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter
More results

Similar Description - LMR23630AFDDA

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
LMR23630 TI1-LMR23630 Datasheet
159Kb / 9P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter
LMR23630 TI1-LMR23630_17 Datasheet
3Mb / 40P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter
LMR23630-Q1 TI1-LMR23630-Q1_18 Datasheet
3Mb / 40P
[Old version datasheet]   SIMPLE SWITCHER 36-V, 3-A Synchronous Step-Down Converter
LMR23630-Q1 TI1-LMR23630-Q1 Datasheet
2Mb / 35P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter
LMR23625-Q1 TI1-LMR23625-Q1_18 Datasheet
3Mb / 40P
[Old version datasheet]   SIMPLE SWITCHER 36-V, 2.5-A Synchronous Step-Down Converter
LMR23610-Q1 TI1-LMR23610-Q1 Datasheet
2Mb / 36P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 1 A Synchronous Step-Down Converter
LMR23625 TI1-LMR23625_17 Datasheet
3Mb / 40P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 2.5 A Synchronous Step-Down Converter
LMR23615 TI1-LMR23615 Datasheet
1Mb / 32P
[Old version datasheet]   SIMPLE SWITCHER 36-V, 1.5-A Synchronous Step-Down Converter
LMR23625-Q1 TI1-LMR23625-Q1 Datasheet
1Mb / 34P
[Old version datasheet]   SIMPLE SWITCHER 36 V, 2.5 A Synchronous Step-Down Converter
LMR23615 TI1-LMR23615_18 Datasheet
2Mb / 37P
[Old version datasheet]   SIMPLE SWITCHER 36-V, 1.5-A Synchronous Step-Down Converter
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 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42


Datasheet Download

Go To PDF Page


Link URL




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

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   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