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Linear Technology Electronic Components Datasheet

LTC3867 Datasheet

Synchronous Step-Down DC/DC Controller

No Preview Available !

FEATURES
n VIN Range: 4V to 38V
n VOUT 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 RSENSE or DCR Current Sensing
n Differential Remote Output Voltage Sense
n Supports Smooth Start-Up into Pre-Biased Outputs
n Programmable Soft-Start or VOUT Tracking
n Hiccup Mode/Soft Recovery from Output Overcurrent
n 24-Lead (4mm × 4mm) QFN Package
APPLICATIONS
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.
LTC3867
Synchronous Step-Down
DC/DC Controller with
Differential Remote Sense
and Nonlinear Control
DESCRIPTION
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.
TYPICAL APPLICATION
High Efficiency Synchronous Step-Down Controller
0.1µF
37.4k
INTVCC
330pF
49.9k
100pF
DIFF+
DIFF
ITEMP
ITSD
DIFFOUT
ILIM
TK/SS
FREQ
PGOOD
RUN
EXTVCC
VIN
MODE/PLLIN TG
IFAST
LTC3867
ITH BOOST
SW
49.9k
SGND INTVCC
VFB
75k
SENSE
BG
SENSE+ PGND
SGND
INTVCC
0.1µF
DB
+
4.7µF
22µF
50V
VIN
5V TO 18V
0.4µH
3.3k 0.22µF
VOUT
1.5V
10A
330µF ×2
+100µF
3867 TA01a
Efficiency and Power Loss
100
90
80
70
60
50
40
30
20
10
0
0.01
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.1 1 10
LOAD CURRENT (A)
0
100
3867 TA01b
3867f
1


Linear Technology Electronic Components Datasheet

LTC3867 Datasheet

Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC3867
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage...................................................–0.3V to 40V
BST Voltage..................................................–0.3V to 46V
SW Voltage.....................................................–5V to 40V
(BST-SW) Voltage..........................................–0.3V to 6V
RSEUNNS, EP+G,OSOENDS, EEX.T...V..C..C.,..I.N...T..V..C..C..V...o.l.t..a.g..e..................–.–00.3.3VVtoto156VV
DINIFTFV–C..C...P..e..a..k..O..u..t..p..u..t.C...u..r.r.e..n..t.........................................–..0....3..V...t.o..I1N0T0VmCAC
All Other Pin Voltages Except TG, BG.......–0.3V to INTVCC
Operating Junction Temperature Range....–40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
RUN 1
DIFF+ 2
DIFF3
DIFFOUT 4
VFB 5
ITH 6
24 23 22 21 20 19
25
SGND
18 PGND
17 BG
16 INTVCC
15 VIN
14 EXTVCC
13 ITEMP
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 47°C/W, θJC = 4.5°C/W
EXPOSED PAD (PIN 25) IS SGND, MUST BE SOLDERED TO PCB
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/
3867f
2


Part Number LTC3867
Description Synchronous Step-Down DC/DC Controller
Maker Linear Technology
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LTC3867 Datasheet PDF






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