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LTC3867IUF#PBF

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LTC3867
1
3867f
TYPICAL APPLICATION
FEATURES DESCRIPTION
Synchronous Step-Down
DC/DC Controller with
Differential Remote Sense
and Nonlinear Control
The LTC
®
3867 is a current mode synchronous step-down
switching regulator controller that drives all N-channel
power MOSFET stages. Output voltage transient excursions
are minimized by use of a nonlinear control architecture
to eliminate clock latency issues.
The maximum current sense voltage is programmable
from 30mV to 75mV, allowing the use of either a discrete
sense resistor or the inductor DCR as the sensing element.
Programmable DCR temperature compensation allows
constant current limit regardless of inductor tempera-
ture. Programmable inductor temperature-based thermal
shutdown protects the power components from thermal
stress. Soft recovery from output shorts or overcurrent
minimizes output overshoot.
The LTC3867 features a precision 0.6V reference and
can regulate output voltages up to 14V from a wide
4V to 38V input supply range. The LTC3867 includes
a high speed differential remote sense amplifier. Burst
Mode
®
operation, continuous and pulse-skipping modes
are supported. The LTC3867 is available in a 24-lead
(4mm × 4mm) QFN package.
High Efficiency Synchronous Step-Down Controller
Efficiency and Power Loss
APPLICATIONS
n
V
IN
Range: 4V to 38V
n
V
OUT
Range: 0.6V to 14V
n
Nonlinear Control Architecture Minimizes Output
Transient Excursions (Optional)
n
Programmable DCR Temperature Compensation
n
±0.75% 0.6V Voltage Reference
n
Fixed Frequency Range of 200kHz to 1.2MHz
n
PLL Frequency Synchronization
n
R
SENSE
or DCR Current Sensing
n
Differential Remote Output Voltage Sense
n
Supports Smooth Start-Up into Pre-Biased Outputs
n
Programmable Soft-Start or V
OUT
Tracking
n
Hiccup Mode/Soft Recovery from Output Overcurrent
n
24-Lead (4mm × 4mm) QFN Package
n
Automotive Systems
n
Telecom Systems
n
Industrial Equipment
n
Distributed DC Power Systems
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, 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, 5705919, 5929620, 6177787,
6580258, 6498466, 6611131.
+
DIFF
+
ITEMP
DIFF
–
DIFFOUT INTV
CC
SGND
I
LIM
TK/SS
FREQ
MODE/PLLIN
IFASTINTV
CC
I
TH
SGND
V
FB
SENSE
–
SENSE
+
PGOOD
RUN
TG
BOOST
SW
V
IN
INTV
CC
BG
PGND
0.1µF
LTC3867
0.4µH
0.22µF
3.3k
0.1µF
37.4k
330pF
49.9k
49.9k
75k
100pF
4.7µF
D
B
3867 TA01a
EXTV
CC
ITSD
22µF
50V
V
IN
5V TO 18V
V
OUT
1.5V
10A
330µF ×2
+100µF
LOAD CURRENT (A)
30
EFFICIENCY (%)
POWER LOSS (W)
90
100
20
10
80
50
70
60
40
0.01 0.1 1 10 100
3867 TA01b
0
1.5
4.0
1.0
0.5
2.5
3.5
3.0
2.0
0
LTC3867
2
3867f
ABSOLUTE MAXIMUM RATINGS
V
IN
Voltage ..................................................–0.3V to 40V
BST Voltage
.................................................–0.3V to 46V
SW Voltage.....................................................–5V to 40V
(BST-SW) Voltage
.........................................–0.3V to 6V
RUN, PGOOD, EXTV
CC
, INTV
CC
Voltage ......... –0.3V to 6V
SENSE
+
, SENSE
–
......................................... –0.3V to 15V
INTV
CC
Peak Output Current .................................100mA
DIFF
–
......................................................–0.3V to INTV
CC
All Other Pin Voltages Except TG, BG ......–0.3V to INTV
CC
Operating Junction Temperature Range ... –40°C to 125°C
Storage Temperature Range
.................. –65°C to 150°C
(Note 1)
24 23 22 21 20 19
7 8 9
TOP VIEW
25
SGND
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
RUN
DIFF
+
DIFF
–
DIFFOUT
V
FB
I
TH
PGND
BG
INTV
CC
V
IN
EXTV
CC
ITEMP
FREQ
MODE/PLLIN
PGOOD
BST
TG
SW
IFAST
TK/SS
SENSE
+
SENSE
–
I
LIM
ITSD
T
JMAX
= 125°C, θ
JA
= 47°C/W, θ
JC
= 4.5°C/W
EXPOSED PAD (PIN 25) IS SGND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3867EUF#PBF LTC3867EUF#TRPBF 3867
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3867IUF#PBF LTC3867IUF#TRPBF 3867
24-Lead (4mm × 4mm) 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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
LTC3867
3
3867f
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 15V, V
RUN
= 5V unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop/Whole System
V
IN
Input Voltage Range 4 38 V
V
OUT
Output Voltage Range 0.6 14 V
V
FB
Regulated Feedback Voltage I
TH
=1.2V, 0°C to 85°C
I
TH
=1.2V, –40°C to 125°C (Note 3)
l
595.5
594
600
600
604.5
606
mV
mV
I
FB
Feedback Current –15 –50 nA
V
REFLNREG
Reference Voltage Line Regulation V
IN
= 4.5V to 38V 0.002 0.02 %/V
V
LOADREG
Output Voltage Load Regulation ΔI
TH
=1.2V to 0.7V
ΔI
TH
=1.2V to 1.6V
l
l
0.01
–0.01
0.1
–0.1
%
%
g
m
Transconductance Amplifier g
m
I
TH
=1.2V, Sink/Source 5µA 2 mmho
V
OVL
Feedback Overvoltage Lockout Measured at V
FB
l
5 7.5 10 %
I
Q
Input DC Supply Current
Normal Mode
Shutdown
V
RUN
= 0V (Note 4)
3.5
30
50
mA
µA
DF
MAX
Maximum Duty Factor In Dropout, f
SW
= 600kHz 96 98 %
UVLO Undervoltage Lockout
V
INTVCC
Falling 3.0 3.2 3.4 V
UVLO
HYS
UVLO Hysteresis 600 mV
I
SENSE
Sense Pin Bias Currents V
SENSE
= 3.3V
l
±1 ±2 µA
I
TEMP
DCR Tempco Compensation Current V
ITEMP
= 500mV
l
27 30 33 µA
I
FAST
Fast Transient Programming Current V
IFAST
= 500mV
l
9 10 11 µA
I
TK/SS
Soft-Start Charge Current V
TK/SS
= 0V 1 1.25 1.4 µA
V
RUN
RUN Pin On Threshold V
RUN
Rising
l
1.1 1.22 1.34 V
V
RUN(HYS)
RUN Pin On Hysteresis 80 mV
I
RUN
RUN Pin Pull-Up Current
RUN < On Threshold
RUN > On Threshold
RUN < 1.1V
RUN > 1.34V
1
5
µA
µA
V
SENSE(MAX)
Maximum Current Sense Threshold I
TH
=1.85V, V
SENSE
=3.3V
I
LIM
= 0V
I
LIM
= 1.5V
I
LIM
= Float
I
LIM
= 3.7V
I
LIM
= INTV
CC
l
l
l
l
l
25
35
45
55
69
30
40
50
60
75
35
45
55
65
79
mV
mV
mV
mV
mV
t
ON(MIN)
Minimum On-Time (Note 6) 65 ns
Power Good
V
PGOOD(ON)
PGOOD Pull-Down Resistance 90 200 Ω
I
PGOOD(OFF)
PGOOD Leakage Current V
PGOOD
= 5V –2 2 µA
t
PGOOD
PGOOD Delay V
PGOOD
High to Low 45 µs
V
PG1
PGOOD Trip Level—with Delay V
FB
with Respect to Set Output Voltage
V
FB
Ramping Up
V
FB
Ramping Down
5
–5
7.5
–7.5
10
–10
%
%
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LTC3867IUF#PBF

Mfr. #:
Buy LTC3867IUF#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Non-Linear Control
Lifecycle:
New from this manufacturer.
Delivery:
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