D ts e t
aa h e
R c e t r lc r nc
o h se Ee to is
Ma u a t r dCo o e t
n fc u e
mp n n s
R c e tr b a d d c mp n ns ae
o h se rn e
o oet r
ma ua trd u ig ete dewaes
n fcue sn i r i/ fr
h
p rh s d f m te oiia s p l r
uc a e r
o h r n l u pi s
g
e
o R c e tr waes rce td f m
r o h se
fr e rae r
o
te oiia I. Al rce t n ae
h
r nl P
g
l e rai s r
o
d n wi tea p o a o teOC
o e t h p rv l f h
h
M.
P r aetse u igoiia fcoy
at r e td sn r n la tr
s
g
ts p o rmso R c e tr e eo e
e t rga
r o h se d v lp d
ts s lt n t g aa te p o u t
e t oui s o u rne
o
rd c
me t o e c e teOC d t s e t
es r x e d h
M aa h e.
Qu l yOv riw
ai
t
e ve
• IO- 0 1
S 90
•A 92 cr ct n
S 1 0 et ai
i
o
• Qu l e Ma ua trr Ls (
ai d
n fcues it QML MI- R -
) LP F
385
53
•C a sQ Mitr
ls
lay
i
•C a sVS a eL v l
ls
p c ee
• Qu l e S p l r Ls o D sr uos( L )
ai d u pi s it f it b tr QS D
e
i
•R c e trsacic l u pir oD A a d
o h se i
r ia s p l t L n
t
e
me t aln u t a dD A sa d r s
es lid sr n L tn ad .
y
R c e tr lcrnc , L i c mmi e t
o h se Ee t is L C s o
o
tdo
t
s p ligp o u t ta s t f c so r x e t-
u pyn rd cs h t ai y u tme e p ca
s
t n fr u lya daee u loto eoiial
i s o q ai n r q a t h s r n l
o
t
g
y
s p l db id sr ma ua trr.
u pi
e yn ut
y n fcues
T eoiia ma ua trr d ts e t c o a yn ti d c me t e e t tep r r n e
h r n l n fcue’ aa h e a c mp n ig hs o u n r cs h ef ma c
g
s
o
a ds e ic t n o teR c e tr n fcue v rino ti d vc . o h se Ee t n
n p c ai s f h o h se ma ua trd eso f hs e ie R c e tr lcr -
o
o
isg aa te tep r r n eo i s mio d co p o u t t teoiia OE s e ic -
c u rne s h ef ma c ft e c n u tr rd cs o h r n l M p c a
o
s
g
t n .T pc lv le aefr eee c p r o e o l. eti mii m o ma i m rt g
i s ‘y ia’ au s r o rfrn e up s s ny C r n nmu
o
a
r xmu ai s
n
ma b b s do p o u t h rceiain d sg , i lt n o s mpetsig
y e a e n rd c c aa tr t , e in smuai , r a l e t .
z o
o
n
© 2 1 R cetr l t n s LC Al i t R sre 0 1 2 1
0 3 ohs E cr i , L . lRg s eevd 7 1 0 3
e e oc
h
T l r m r, l s v iw wrcl . m
o e n oe p ae it w . e c o
a
e
s
o ec
®
ISL6439, ISL6439A
Data Sheet
November 5, 2008
FN9057.5
Single Sync Buck PWM Controller for
Broadband Gateway Applications
The ISL6439 makes easy work out of implementing a
complete control and protection scheme for a DC/DC
step-down converter. Designed to drive N-Channel
MOSFETs in a synchronous buck topology, the ISL6439
integrates the control, output adjustment, monitoring and
protection functions into a single package.
The ISL6439 provides simple, single feedback loop, voltage-
mode control with fast transient response. The output
voltage can be precisely regulated to as low as 0.8V, with a
maximum tolerance of ±1.5% over temperature and line
voltage variations. A fixed frequency oscillator reduces
design complexity, while balancing typical application cost
and efficiency.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/μs slew rate which enables high converter
bandwidth for fast transient performance. The resulting
PWM duty cycles range from 0% to 100%.
Protection from overcurrent conditions is provided by
monitoring the r
DS(ON)
of the upper MOSFET to inhibit PWM
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
Features
• Operates from 3.3V to 5V Input
• 0.8V to V
IN
Output Range
- 0.8V Internal Reference
- ±1.5% Over Load, Line Voltage and Temperature
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
• Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET’s r
DS(on)
• Converter can Source and Sink Current
• Small Converter Size
- Internal Fixed Frequency Oscillator
- ISL6439: 300kHz
- ISL6439A: 600kHz
• Internal Soft-Start
• 14 Pin SOIC or 16 Lead 5x5 QFN
• QFN Package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Lead - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-free (RoHS compliant)
Applications
• Cable Modems, Set Top Boxes, and DSL Modems
• DSP and Core Communications Processor Supplies
• Memory Supplies
• Personal Computer Peripherals
• Industrial Power Supplies
• 3.3V-Input DC/DC Regulators
• Low-Voltage Distributed Power Supplies
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003-2004, 2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL6439, ISL6439A
Pinouts
ISL6439, ISL6439A
(14 LEAD SOIC)
TOP VIEW
GND 1
LGATE 2
CPVOUT 3
CT1 4
CT2 5
OCSET 6
FB 7
14 UGATE
13 BOOT
12 PHASE
11 VCC
10 CPGND
9 ENABLE
8 COMP
CT2
OCSET
3
4
5
NC
6
FB
7
COMP
8
ENABLE
10 CPGND
9
NC
CPVOUT
CT1
1
2
ISL6439, ISL6439A
(16 LEAD 5x5 QFN)
TOP VIEW
UGATE
14
LGATE
BOOT
13
12 PHASE
11 VCC
GND
15
16
Ordering Information
PART NUMBER
(See Note)
ISL6439CBZ
ISL6439IBZ
ISL6439AIBZ
ISL6439IRZ
ISL6439AIRZ
ISL6439EVAL1
ISL6439EVAL2
PART MARKING
6439CBZ
6439IBZ
6439AIBZ
ISL6439 IRZ
ISL6439 AIRZ
ISL6439 SOIC Evaluation Board
ISL6439 QFN Evaluation Board
TEMP RANGE (°C)
0 to +70
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE
(Pb-Free)
14 lead SOIC
14 lead SOIC
14 lead SOIC
16 Lead 5x5 QFN
16 Lead 5x5 QFN
PKG DWG. #
M14.15
M14.15
M14.15
L16.5x5B
L16.5x5B
*Add “-T” suffix to part number for tape and reel packaging. Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).
Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J
STD-020.
2
FN9057.5
November 5, 2008
ISL6439, ISL6439A
Typical Application - 3.3V Input
3.3V
V
IN
C
IN
C
BULK
OCSET
R
OCSET
CPVOUT
CT2
CPGND
GND
ISL6439
BOOT
C
BOOT
UGATE
PHASE
ENABLE
Q
1
L
OUT
D
BOOT
C
DCPL
C
HF
VCC
CT1
C
PUMP
V
OUT
LGATE
FB
DISABLE
COMP
Q
2
C
OUT
C
I
R
FB
R
F
C
F
R
OFFSET
3
FN9057.5
November 5, 2008
ISL6439, ISL6439A
Typical Application - 5V Input
+5V
V
IN
VCC
CT1
OCSET
R
OCSET
CPVOUT
ISL6439
N/C
CT2
BOOT
C
BOOT
UGATE
PHASE
ENABLE
LGATE
DISABLE
COMP
FB
Q
2
Q
1
D
BOOT
C
IN
C
BULK
C
HF
CPGND
GND
L
OUT
V
OUT
C
OUT
C
I
R
FB
R
F
C
F
R
OFFSET
Block Diagram
VCC
CPVOUT
CT1
CT2
CPGND
OCSET
20μA
CHARGE
PUMP
POWER-ON
RESET (POR)
ENABLE
OC
COMPARATOR
+
-
BOOT
SOFTSTART
UGATE
PHASE
ERROR
AMP
+
-
PWM
COMPARATOR
+
-
INHIBIT
+
0.8V
-
GATE
CONTROL
LOGIC
PWM
LGATE
FB
OSCILLATOR
COMP
FIXED 300kHz or 600kHz
GND
4
FN9057.5
November 5, 2008
Embedded System
京公网安备 11010802033920号
EEWORLD
