전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

FAN53600 데이터시트(PDF) 11 Page - Fairchild Semiconductor

부품명 FAN53600
상세설명  3 MHz, 600 mA / 1A Synchronous Buck Regulator
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN53600 데이터시트(HTML) 11 Page - Fairchild Semiconductor

Back Button FAN53600 Datasheet HTML 7Page - Fairchild Semiconductor FAN53600 Datasheet HTML 8Page - Fairchild Semiconductor FAN53600 Datasheet HTML 9Page - Fairchild Semiconductor FAN53600 Datasheet HTML 10Page - Fairchild Semiconductor FAN53600 Datasheet HTML 11Page - Fairchild Semiconductor FAN53600 Datasheet HTML 12Page - Fairchild Semiconductor FAN53600 Datasheet HTML 13Page - Fairchild Semiconductor FAN53600 Datasheet HTML 14Page - Fairchild Semiconductor FAN53600 Datasheet HTML 15Page - Fairchild Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 16 page
background image
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN53600 / FAN53610 • Rev. 1.0.0
11
Operation Description
The FAN53600/10 is a 3 MHz, step-down switching voltage
regulator, available in 600 mA or 1 A options, that delivers a
fixed output from an input voltage supply of 2.3 V to 5.5 V.
Using
a
proprietary
architecture
with
synchronous
rectification, the FAN53600/10 is capable of delivering a
peak efficiency of 92%, while maintaining efficiency over
80% at load currents as low as 1 mA.
The regulator operates at a nominal fixed frequency of
3 MHz, which reduces the value of the external components
to as low as 1 µH for the output inductor and 4.7 µF for the
output capacitor. In addition, the PWM modulator can be
synchronized to an external frequency source.
Control Scheme
The FAN53600/10 uses a proprietary, non-linear, fixed-
frequency PWM modulator to deliver a fast load transient
response, while maintaining a constant switching frequency
over a wide range of operating conditions. The regulator
performance is independent of the output capacitor ESR,
allowing the use of ceramic output capacitors. Although this
type of operation normally results in a switching frequency
that varies with input voltage and load current, an internal
frequency loop holds the switching frequency constant over
a large range of input voltages and load currents.
For very light loads, the FAN53600/10 operates in
Discontinuous Current (DCM), single-pulse, PFM Mode;
which produces low output ripple compared with other PFM
architectures. Transition between PWM and PFM is
seamless, with a glitch of less than 18 mV at VOUT during the
transition between DCM and CCM modes.
Combined
with
exceptional
transient
response
characteristics, the very low quiescent current of the
controller (26 µA) maintains high efficiency, even at very light
loads,
while
preserving
fast transient response
for
applications requiring tight output regulation.
100% Duty Cycle Operation
When VIN approaches VOUT, the regulator increases its duty
cycle until 100% duty cycle is reached. As the duty cycle
approaches 100%, the switching frequency declines due to
the minimum off-time (tOFF(MIN)) of about 50 ns imposed by
the control circuit. When 100% duty cycle is reached, VOUT
follows VIN with a drop-out voltage (VDROPOUT) determined by
the total resistance between VIN and VOUT as calculated by:
(
)
L
)
ON
(
DS
LOAD
DROPOUT
DCR
R
PMOS
I
V
+
=
(1)
Enable and Soft-Start
When EN is LOW, all circuits are off and the IC draws
~50 nA of current. When EN is HIGH and VIN is above its
UVLO threshold, the regulator begins a soft-start cycle. The
output ramp during soft-start is a fixed slew rate of 50 mV/
μs
from 0 to 1 VOUT, then 12.5 mV/
μs until the output reaches its
setpoint. Regardless of the state of the MODE pin, PFM
Mode is enabled to prevent current from being discharged
from COUT if soft-start begins when COUT is charged.
All voltage options can be ordered with a feature that actively
discharges FB to ground through a 230
Ω path when EN is
LOW. Raising EN above its threshold voltage activates the
part and starts the soft-start cycle. During soft-start, the
internal reference is ramped using an exponential RC shape
to prevent overshoot of the output voltage. Current limiting
minimizes inrush during soft-start.
The IC may fail to start if heavy load is applied during startup
and/or if excessive COUT is used. This is due to the current-
limit fault response, which protects the IC in the event of an
over-current condition present during soft-start.
The current required to charge COUT during soft-start,
commonly referred to as “displacement current,” is given as:
dt
dV
C
I
OUT
DISP
=
(2)
where the
dt
dV term refers to the soft-start slew rate above.
To prevent shutdown during soft-start, the following condition
must be met:
)
(DC
MAX
LOAD
DISP
I
I
I
<
+
(3)
where IMAX(DC) is the maximum load current the IC is
guaranteed to support.
Startup into Large COUT
Multiple soft-start cycles are required for no-load startup if
COUT is greater than 15
μF. Large COUT requires light initial
load to ensure the FAN53600/10 starts appropriately. The IC
shuts down for 1.3 ms when IDISP exceeds ILIMIT for more
than 210
μs of current limit. The IC then begins a new soft-
start cycle. Since COUT retains its charge when the IC is off,
the IC reaches regulation after multiple soft-start attempts.
MODE Pin
Logic 1 on this pin forces the IC to stay in PWM Mode. Logic
0 allows the IC to automatically switch to PFM during light
loads. If the MODE pin is toggled, with a frequency between
1.3 MHz and 1.7 MHz, the converter synchronizes its
switching frequency to two times the frequency on the
MODE pin (fMODE).
The MODE pin is internally buffered with a Schmitt trigger,
which allows the MODE pin to be driven with slow rise and
fall times. An asymmetric duty cycle for frequency
synchronization is also permitted as long as the minimum
time below VIL(MAX) or above VIH(MAX) is 100 ns.


유사한 부품 번호 - FAN53600

제조업체부품명데이터시트상세설명
logo
ON Semiconductor
FAN53600 ONSEMI-FAN53600 Datasheet
1Mb / 16P
   3 MHz, 600 mA / 1A Synchronous Buck Regulator
March 2016 Rev. 1.4
FAN53600AUC28X ONSEMI-FAN53600AUC28X Datasheet
1Mb / 16P
   3 MHz, 600 mA / 1A Synchronous Buck Regulator
March 2016 Rev. 1.4
FAN53600AUC33X ONSEMI-FAN53600AUC33X Datasheet
1Mb / 16P
   3 MHz, 600 mA / 1A Synchronous Buck Regulator
March 2016 Rev. 1.4
More results

유사한 설명 - FAN53600

제조업체부품명데이터시트상세설명
logo
ON Semiconductor
FAN53600 ONSEMI-FAN53600 Datasheet
1Mb / 16P
   3 MHz, 600 mA / 1A Synchronous Buck Regulator
March 2016 Rev. 1.4
FAN5361 ONSEMI-FAN5361 Datasheet
1Mb / 18P
   6 MHz, 600 mA / 750 mA Synchronous Buck Regulator
October-2017, Rev. 2
logo
Fairchild Semiconductor
FAN53601 FAIRCHILD-FAN53601 Datasheet
996Kb / 14P
   6 MHz 600 mA / 1 A Synchronous Buck Regulator
logo
Analog Devices
ADP5022 AD-ADP5022 Datasheet
683Kb / 28P
   Dual 3 MHz, 600 mA Buck Regulator with 150 mA LDO
REV. A
logo
Microchip Technology
MCP1612T-ADJI MICROCHIP-MCP1612T-ADJI Datasheet
249Kb / 22P
   Single 1A, 1.4 MHz Synchronous Buck Regulator
08/24/05
MCP1612 MICROCHIP-MCP1612 Datasheet
315Kb / 22P
   Single 1A, 1.4 MHz Synchronous Buck Regulator
2005
MCP1612 MICROCHIP-MCP1612_13 Datasheet
333Kb / 22P
   Single 1A, 1.4 MHz Synchronous Buck Regulator
2004-2013
MCP1603 MICROCHIP-MCP1603 Datasheet
774Kb / 26P
   2.0 MHz, 500 mA Synchronous Buck Regulator
2007
MCP1603 MICROCHIP-MCP1603_12 Datasheet
796Kb / 34P
   2.0 MHz, 500 mA Synchronous Buck Regulator
2007-2012 11/29/11
logo
Analog Devices
ADP2140 AD-ADP2140 Datasheet
2Mb / 32P
   3 MHz, 600 mA, Low Quiescent Current Buck with 300 mA LDO Regulator
Rev. B
More results


Html Pages

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


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
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