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LTC3608IWKG#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC3608
1
3608fc
0.8µH
4.7µF
10µF
×3
V
IN
4V TO 18V
V
OUT
2.5V
8A
3608 TA01a
187k
0.1µF
I
ON
V
IN
SW
BOOST
RUN/SS
I
TH
V
ON
V
OUT
SGND INTV
CC
FCB
PGND
V
FB
V
RNG
0.22µF
100µF
×2
11.3k
LTC3608
1500pF
EXTV
CC
PGOOD
30.1k
9.53k
100pF
LOAD CURRENT (A)
0.01
EFFICIENCY (%)
POWER LOSS (mW)
80
90
3608 TA01b
70
50
60
85
95
75
55
65
0.1 1 10
100
1000
100
1
10
10000
V
IN
= 12V
V
OUT
= 2.5V
EXTV
CC
= 5V
POWER LOSS
EFFICIENCY
Features
applications
Description
18V, 8A Monolithic
Synchronous Step-Down
DC/DC Converter
The LTC
®
3608 is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 8A output
current from a 4V to 18V (20V maximum) input supply. It
uses a valley current control architecture to deliver very
low duty cycle operation at high frequency with excellent
transient response. The operating frequency is selected
by an external resistor and is compensated for variations
in V
IN
and V
OUT
.
The LTC3608 can be configured for discontinuous or
forced continuous operation at light load. Forced continu-
ous operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and an optional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor. The regulator current limit is user programmable.
A power good output voltage monitor indicates when
the output is in regulation. The LTC3608 is available in a
compact 7mm × 8mm QFN package.
n
8A Output Current
n
Wide V
IN
Range = 4V to 18V
n
Internal N-Channel MOSFETs
n
True Current Mode Control
n
Optimized for High Step-Down Ratios
n
t
ON(MIN)
≤ 100nsec
n
Extremely Fast Transient Response
n
Stable with Ceramic C
OUT
n
±1% 0.6V Voltage Reference
n
Power Good Output Voltage Monitor
n
Adjustable On-Time/Switching Frequency
n
Adjustable Current Limit
n
Programmable Soft-Start
n
Output Overvoltage Protection
n
Optional Short-Circuit Shutdown Timer
n
Low Shutdown I
Q
: 15µA
n
Available in a 7mm × 8mm 52-Lead QFN Package
n
Point of Load Regulation
n
Distributed Power Systems
High Efficiency Step-Down Converter
Efficiency and Power Loss
vs Load Current
typical application
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 6100678, 6580258, 5847554, 6304066.
LTC3608
2
3608fc
absolute MaxiMuM ratings
Input Supply Voltage (SV
IN
, PV
IN
, I
ON
) ....... 20V to –0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................ 26V to –0.3V
SW Voltage ............................................ 20V to –0.3V
INTV
CC
, EXTV
CC
, (BOOST – SW), RUN/SS,
PGOOD Voltages ...................................... 7V to –0.3V
FCB, V
ON
, V
RNG
Voltages ............ INTV
CC
+ 0.3V to –0.3V
I
TH
, V
FB
Voltages ....................................... 2.7V to –0.3V
Operating Junction Temperature Range
(Notes 2, 4) ........................................ –40°C to 125°C
Storage Temperature Range ................... –55°C to 125°C
(Note 1)
pin conFiguration
TOP VIEW
WKG PACKAGE
52-LEAD (7mm × 8mm) QFN MULTIPAD
PV
IN
1
PV
IN
2
PV
IN
3
PV
IN
4
PV
IN
5
PV
IN
6
PV
IN
7
SW 8
NC 9
SGND 10
BOOST 11
RUN/SS 12
V
ON
13
SGND 14
40 PGND
39 PGND
38 PGND
37 PGND
36 PGND
35 PGND
34 PGND
33 SW
32 INTV
CC
31 INTV
CC
30 SV
IN
29 EXTV
CC
28 NC
27 SGND
SGND 15
PGOOD 16
V
RNG
17
I
TH
18
FCB 19
SGND 20
NC 21
I
ON
22
V
FB
23
NC 24
NC 25
SGND 26
52 PV
IN
51 PV
IN
50 PV
IN
49 PV
IN
48 PV
IN
47 SW
46 SW
45 SW
44 SW
43 SW
42 SW
41 SW
53
PV
IN
55
SW
54
SGND
T
JMAX
= 125°C, θ
JA
= 29°C/W
orDer inForMation
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3608EWKG#PBF LTC3608EWKG#TRPBF LTC3608WKG
52-Lead (7mm × 8mm) Plastic QFN
–40°C to 125°C
LTC3608IWKG#PBF LTC3608IWKG#TRPBF LTC3608WKG
52-Lead (7mm × 8mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC3608
3
3608fc
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
SV
IN
Operating Input Voltage Range 4 18 V
I
Q
Input DC Supply Current
Normal
Shutdown Supply Current
900
15
2000
30
µA
µA
V
FB
Feedback Reference Voltage I
TH
= 1.2V, –40°C to 85°C (Note 3)
I
TH
= 1.2V, –40°C to 125°C (Note 3)
l
0.594
0.590
0.600
0.600
0.606
0.610
V
V
ΔV
FB(LINEREG)
Feedback Voltage Line Regulation V
IN
= 4V to 18V, I
TH
= 1.2V (Note 3) 0.002 %/V
ΔV
FB(LOADREG)
Feedback Voltage Load Regulation I
TH
= 0.5V to 1.9V (Note 3) –0.05 –0.3 %
I
FB
Feedback Input Current V
FB
= 0.6V –5 ±50 nA
g
m(EA)
Error Amplifier Transconductance I
TH
= 1.2V (Note 3)
l
1.4 1.7 2 mS
V
FCB
Forced Continuous Threshold
l
0.54 0.6 0.66 V
I
FCB
Forced Continuous Pin Current V
FCB
= 0.6V –1 –2 µA
t
ON
On-Time I
ON
= 60µA, V
ON
= 1.5V
I
ON
= 60µA, V
ON
= 0V
220 280
110
340 ns
ns
t
ON(MIN)
Minimum On-Time I
ON
= 180µA, V
ON
= 0V 60 100 ns
t
OFF(MIN)
Minimum Off-Time I
ON
= 30µA, V
ON
= 1.5V 320 500 ns
I
VALLEY(MAX)
Maximum Valley Current V
RNG
= 0.5V, V
FB
= 0.56V, FCB = 0V
V
RNG
= 0V, V
FB
= 0.56V, FCB = 0V
l
l
5
8
11
16
A
A
I
VALLEY(MIN)
Maximum Reverse Valley Current V
RNG
= 0.5V, V
FB
= 0.64V, FCB = 0V
V
RNG
= 0V, V
FB
= 0.64V, FCB = 0V
5.5
7.5
A
A
ΔV
FB(OV)
Output Overvoltage Fault Threshold 7 10 13 %
V
RUN/SS(ON)
RUN Pin Start Threshold
l
0.8 1.5 2 V
V
RUN/SS(LE)
RUN Pin Latchoff Enable Threshold RUN/SS Pin Rising 4 4.5 V
V
RUN/SS(LT)
RUN Pin Latchoff Threshold RUN/SS Pin Falling 3.5 4.2 V
I
RUN/SS(C)
Soft-Start Charge Current V
RUN/SS
= 0V –0.5 –1.2 –3 µA
I
RUN/SS(D)
Soft-Start Discharge Current V
RUN/SS
= 4.5V, V
FB
= 0V 0.8 1.8 3 µA
V
IN(UVLO)
Undervoltage Lockout INTV
CC
Falling
l
3.4 3.9 V
V
IN(UVLOR)
Undervoltage Lockout Release INTV
CC
Rising
l
3.5 4 V
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
10
8
19
14
mΩ
mΩ
electrical characteristics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LTC3608IWKG#PBF

Mfr. #:
Buy LTC3608IWKG#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 8A (Iout) 18Vin (20V Max.) Synch Step Down Reg
Lifecycle:
New from this manufacturer.
Delivery:
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