Controller. LTC3814-5 Datasheet

LTC3814-5 Datasheet PDF

Part LTC3814-5
Description 60V Current Mode Synchronous Step-Up Controller
Feature .
Manufacture Linear Technology
Datasheet
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LTC3814-5 Datasheet





LTC3814-5
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LTC3814-5
60V Current Mode
Synchronous Step-Up Controller
FEATURES
High Output Voltages: Up to 60V
Large 1Ω Gate Drivers
No Current Sense Resistor Required
Dual N-Channel MOSFET Synchronous Drive
±0.5% 0.8V Voltage Reference
Fast Transient Response
Programmable Soft-Start
Generates 5.5V Driver Supply
Power Good Output Voltage Monitor
Adjustable Off-Time/Frequency: tOFF(MIN) < 100ns
Adjustable Cycle-by-Cycle Current Limit
Undervoltage Lockout On Driver Supply
Output Overvoltage Protection
Thermally Enhanced 16-Pin TSSOP Package
APPLICATIONS
24V Fan Supplies
48V Telecom and Base Station Power Supplies
Networking Equipment, Servers
Automotive and Industrial Control Systems
DESCRIPTION
The LTC3814-5 is a synchronous step-up switching regula-
tor controller that can generate output voltages up to 60V.
The LTC3814-5 uses a constant off-time peak current
control architecture to deliver very high duty cycles with
accurate cycle-by-cycle current limit without requiring a
sense resistor.
A precise internal reference provides ±0.5% DC accuracy.
A high bandwidth (25MHz) error amplifier provides very
fast line and load transient response. Large 1Ω gate driv-
ers allow the LTC3814-5 to drive large power MOSFETs
for higher current applications. The operating frequency
is selected by an external resistor and is compensated for
variations in VIN. A shutdown pin allows the LTC3814-5 to
be turned off reducing the supply current to <230µA.
PARAMETER
Maximum VOUT
MOSFET Gate Drive
INTVCC UV+
INTVCC UV
LTC3813
100V
6.35V to 14V
6.2V
6V
LTC3814-5
60V
4.5V to 14V
4.2V
4V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5847554, 6304066, 6476589, 6580258, 6677210, 6774611.
TYPICAL APPLICATIONS
High Efficiency High Voltage Step-Up Converter
VOUT
PGOOD
263k
100k
1000pF
0.01µF
100k
100pF
ION NDRV
PGOOD
BOOST
LTC3814-5
VRNG
TG
VOFF
SW
RUN/SS
EXTVCC
INTVCC
ITH
BG
VFB SGND PGND
+
4.7µH
VIN
4.5V TO 14V
22µF
0.1µF
M1
Si7848DP
VOUT
24V
4A
D1
M2 MBR1100
Si7848DP
1µF
29.4k+
270µF
×2
1k
38145 TA01
Efficiency vs Load Current
100
VIN = 12V
95
90 VIN = 5V
85
80
0
1 2 34
LOAD (A)
38145 TA01b
38145f
1



LTC3814-5
www.DataSheet4U.com
LTC3814-5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltages
INTVCC ................................................... –0.3V to 14V
(INTVCC – PGND), (BOOST – SW) ......... –0.3V to 14V
BOOST (Continuous) ............................. –0.3V to 85V
BOOST (≤400ms) .................................. –0.3V to 95V
EXTVCC .................................................. –0.3V to 15V
(EXTVCC – INTVCC) ................................. –14V to 12V
(NDRV – INTVCC) Voltage .......................... –0.3V to 10V
SW Voltage (Continuous).............................. –1V to 70V
SW Voltage (400ms)..................................... –1V to 80V
IOFF Voltage (Continuous) .......................... –0.3V to 70V
IOFF Voltage (400ms) ................................. –0.3V to 80V
RUN/SS Voltage........................................... –0.3V to 5V
PGOOD Voltage............................................ –0.3V to 7V
VRNG, VOFF Voltages................................... –0.3V to 14V
FB Voltage................................................. –0.3V to 2.7V
TG, BG, INTVCC, EXTVCC RMS Currents.................50mA
Operating Temperature Range (Note 2) ... –40°C to 85°C
Junction Temperature (Notes 3, 7) ....................... 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PACKAGE/ORDER INFORMATION
IOFF
VOFF
VRNG
PGOOD
1
2
3
4
ITH
VFB
RUN/SS
5
6
7
SGND 8
TOP VIEW
16 BOOST
15 TG
14 SW
13 PGND
17
12 BG
11 INTVCC
10 EXTVCC
9 NDRV
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 38°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3814EFE-5#PBF
LTC3814EFE-5#TRPBF 3814EFE-5
16-Lead Plastic TSSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, INTVCC = VBOOST = VRNG = VEXTVCC = VNDRV = VOFF = 5V, unless
otherwise specified.
SYMBOL
PARAMETER
Main Control Loop
INTVCC
IQ
IBOOST
INTVCC Supply Voltage
INTVCC Supply Current
INTVCC Shutdown Current
BOOST Supply Current
CONDITIONS
RUN/SS > 1.5V (Note 5)
RUN/SS = 0V
(Note 5)
RUN/SS = 0V
MIN TYP MAX
4.35
14
36
224 600
240 400
05
UNITS
V
mA
µA
µA
µA
38145f
2




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