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LTC3613IWKH#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LTC3613
1
3613fa
TYPICAL APPLICATION
FEATURES DESCRIPTION
24V, 15A Monolithic
Step Down Regulator with
Differential Output Sensing
The LTC
®
3613 is a monolithic synchronous step-down
switching regulator capable of regulating outputs from 0.6V
to 5.5V with up to 15A output current. The controlled on-time
constant frequency valley current mode architecture allows for
both fast transient response and constant frequency switch-
ing in steady-state operation, independent of V
IN
, V
OUT
and
load. This also provides excellent current sharing capability.
Differential output voltage sensing along with a precision
internal reference combine to offer ±0.67% output regula-
tion, even if the output ground reference deviates from
local ground by 500mV. The switching frequency can be
programmed from 200kHz to 1MHz with an external resis-
tor. The switching frequency is also phase synchronizable
to an external clock in applications where switching noise/
EMI reduction is crucial.
Very low t
ON
and t
OFF
times allow for near 0% and near 100%
duty cycles, respectively. Voltage tracking soft start-up is
provided for tracking and sequencing applications. Safety fea-
tures include output overvoltage protection, programmable
current limit with foldback, and power good monitoring.
High Efficiency High Power Step-Down Converter
Efficiency and Power Loss
vs Load Current
APPLICATIONS
n
Wide V
IN
Range: 4.5V to 24V;
V
OUT
Range: 0.6V to 5.5V at up to 15A
n
0.67% Output Voltage Accuracy
n
Controlled On-Time Valley Current Mode Architecture,
Excellent Current Sharing Capability
n
Frequency Programmable from 200kHz to 1MHz
and Synchronizable to External Clock
n
R
SENSE
or Inductor DCR Current Sensing With
Accurate Current Limit
n
Fast Transient Response
n
Differential Output Voltage Sensing Allowing 500mV
Common Mode Remote Ground
n
t
ON(MIN)
= 65ns; t
OFF(MIN)
= 105ns
n
Overvoltage Protection and Current Limit Foldback
n
Power Good Output Voltage Monitor
n
Voltage Tracking Start-Up
n
External V
CC
Input for Bypassing Internal LDO
n
Micropower Shutdown: I
Q
= 15µA
n
7mm × 9mm 56-pin QFN Package
n
Distributed Power System
n
Point-of-Load Converters
n
Servers
V
RNG
SV
IN
PV
IN
MODE/PLLIN
V
OUT
PGOOD
RUN
SENSE
–
SENSE
+
100k
10
10
INTV
CC
LTC3613
15k
10k
330µF
×2
0.47µH
1.5m
0.1µF
4.7µF
82µF
V
OUT
1.5V
15A
3613 TA01
V
IN
4.5V TO 24V
0.1µF
1000pF
TRACK/SS
ITH
RT
115k
270pF
47pF
0.1µF
21k
EXTV
CC
SGND
BOOST
SW
INTV
CC
PGND
V
OSNS
+
V
OSNS
–
+
+
L, LT, LTC, LTM, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks
and Hot Swap and No R
SENSE
is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5481178, 5487554, 6580258, 6304066, 6476589, 6774611.
LOAD CURRENT (A)
0.01
0
10
20
30
40
EFFICIENCY (%)
50
60
70
80
90
100
0.1 1
3613 TA01a
0
0.5
1.0
1.5
2.0
POWER LOSS (W)
2.5
3.0
3.5
10
V
IN
= 12V
V
OUT
= 1.5V
PULSE-SKIPPING MODE
FORCED
CONTINUOUS
MODE
LTC3613
2
3613fa
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
Supply Voltage (PV
IN
, SV
IN
) ....................... –0.3V to 24V
Boost Voltage ............................................ –0.3V to 30V
SW Voltage ................................................ –0.3V to 24V
INTV
CC
, EXTV
CC
, (BOOST-SW), MODE /PLLIN,
V
RNG
, PGOOD, RUN Voltages ....................... –0.3V to 6V
V
OSNS
+
, V
OSNS
–
Voltages ........–0.6V to (INTV
CC
+ 0.3V)
V
OUT
, SENSE
+,
SENSE
–
Voltages ................. –0.6V to 6V
RT, ITH Voltages .....................–0.3V to (INTV
CC
+ 0.3V)
TRACK/SS Voltages ..................................... –0.3V to 5V
Operating Junction Temperature Range
(Notes 2, 4) ............................................ –40°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
(Note 1)
TOP VIEW
WKH PACKAGE
56-LEAD (7mm × 9mm) MULTIPAD QFN
PV
IN
1
PV
IN
2
PV
IN
3
PV
IN
4
PV
IN
5
PV
IN
6
PV
IN
7
PV
IN
8
PV
IN
9
SW 10
BOOST 11
SGND 12
PGOOD 13
SNS
+
14
SNS
–
15
SGND 16
44 PGND
43 PGND
42 PGND
41 PGND
40 PGND
39 PGND
38 PGND
37 PGND
36 PGND
35 SW
34 INTV
CC
33 INTV
CC
32 SV
IN
31 MODE/PLLIN
30 EXTV
CC
29 SGND
SGND 17
V
OUT
18
SGND 19
V
OSNS
–
20
V
OSES
+
21
TRACK/SS 22
ITH
23
V
RNG
24
RT 25
RUN 26
NC 27
SGND 28
56 PV
IN
55 PV
IN
54 PV
IN
53 PV
IN
52 NC
51 SW
50 SW
49 SW
48 SW
47 SW
46 SW
45 SW
PV
IN
57
SW
58
SGND
59
T
JMAX
= 125°C, θ
JA
= 29°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3613EWKH#PBF LTC3613EWKH#TRPBF LTC3613WKH
56-Lead (7mm × 9mm) Plastic QFN
–40°C to 125°C
LTC3613IWKH#PBF LTC3613IWKH#TRPBF LTC3613WKH
56-Lead (7mm × 9mm) 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/
LTC3613
3
3613fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
V
IN
Input Voltage Operating Range
l
4.5 24 V
V
OUT
Output Voltage Operating Range
l
0.6 5.5 V
I
Q
Input DC Supply Current
Normal
Shutdown Supply Current
MODE/PLLIN = INTV
CC
RUN = 0V
2
15
4
25
mA
µA
V
REG
Regulated Differential Feedback Voltage
(V
OSNS
+
– V
OSNS
–
)
I
TH
= 1.2V (Note 3)
T
A
= 25°C
T
A
= 0°C to 85°C
T
A
= –40°C to 125°C
l
l
0.5985
0.596
0.594
0.6
0.6
0.6
0.6015
0.604
0.606
V
V
V
Regulated Differential Feedback
Voltage Over Line, Load and Common Mode
(V
OSNS
+
– V
OSNS
–
)
V
IN
= 4.5V to 24V, ITH = 0.5V to 1.9V,
V
OSNS
–
= ±500mV (Note 3)
T
A
= 0°C to 85°C
T
A
= –40°C to 125°C
l
l
0.594
0.591
0.6
0.6
0.606
0.609
V
V
t
ON(MIN)
Minimum On-Time 65 ns
t
OFF(MIN)
Minimum Off-Time 105 ns
g
m(EA)
Error Amplifier Transconductance I
TH
= 1.2V (Note 3)
l
1.4 1.7 2 mS
V
SENSE(MAX)
Valley Current Sense Threshold,
V
SENSE
+
– V
SENSE
–
,
Peak Current = Valley + Ripple
V
RNG
= 2V, V
FB
= 0.57V
V
RNG
= 0V, V
FB
= 0.57V
V
RNG
= INTV
CC
, V
FB
= 0.57V
l
l
l
80
22
39
100
30
50
120
38
61
mV
mV
mV
V
SENSE(MIN)
Minimum Current Sense Threshold,V
SENSE
+
–
V
SENSE
–
, Force Continuous Operation
V
RNG
= 2V, V
FB
= 0.63V
V
RNG
= 0V, V
FB
= 0.63V
V
RNG
= INTV
CC
, V
FB
= 0.63V
–50
–15
–25
mV
mV
mV
V
SENSE(CM)
SENSE
+
, SENSE
–
Voltage Range (Common
Mode)
l
–0.5 5.5 V
I
SENSE
SENSE
+
, SENSE
–
Input Bias Current V
SENSE(CM)
= 0.6V
V
SENSE(CM)
= 5V
±5
1
±50
4
nA
µA
V
RUN(TH)
RUN Pin On Threshold V
RUN
Rising
l
1.1 1.2 1.3 V
V
RUN(HYS)
RUN Pin Hysteresis 80 mV
I
SS
Soft-Start Charging Current V
TRACKSS
= 0V 1.0 µA
UVLO INTV
CC
Undervoltage Lockout
INTV
CC
Undervoltage Lockout Release
Falling
Rising
l
l
3.4 3.65
4.2
4.0
4.5
V
V
I
VOSNS
+
V
OSNS
+
Input Bias Current V
FB
= 0.6V ±5 ±25 nA
I
VOSNS
–
V
OSNS
–
Input Bias Current V
FB
= 0.6V –15 –50 µA
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. SV
IN
= 15V, V
FB
= V
OSNS
+
– V
OSNS
–
, unless otherwise noted. (Note 4)
ELECTRICAL CHARACTERISTICS
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LTC3613IWKH#TRPBF

Mfr. #:
Buy LTC3613IWKH#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Fast, Accurate, Monolithic Step-Down Regulator with Differential Output Sensing
Lifecycle:
New from this manufacturer.
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