Step-Up Controller. LTC3813 Datasheet

LTC3813 Controller. Datasheet pdf. Equivalent

Part LTC3813
Description 100V Current Mode Synchronous Step-Up Controller
Feature www.DataSheet4U.com LTC3813 100V Current Mode Synchronous Step-Up Controller FEATURES ■ ■ ■ ■ ■ ■ ■.
Manufacture Linear Technology
Datasheet
Download LTC3813 Datasheet



LTC3813
www.DataSheet4U.com
LTC3813
100V Current Mode
Synchronous Step-Up Controller
FEATURES
High Output Voltages: Up to 100V
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 10V Driver Supply from Input Supply
Synchronizable to External Clock
Power Good Output Voltage Monitor
Adjustable Off-Time/Frequency: tOFF(MIN) < 100ns
Adjustable Cycle-by-Cycle Current Limit
Programmable Undervoltage Lockout
Output Overvoltage Protection
28-Pin SSOP Package
U
APPLICATIO S
24V Fan Supplies
48V Telecom and Base Station Power Supplies
Networking Equipment, Servers
Automotive and Industrial Control Systems
DESCRIPTIO
The LTC3813 is a synchronous step-up switching regulator
controller that can generate output voltages up to 100V.
The LTC3813 uses a constant off-time peak current control
architecture 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 drivers
allow the LTC3813 to drive multiple MOSFETs for higher
current applications. The operating frequency is selected
by an external resistor and is compensated for variations
in VIN and can also be synchronized to an external clock
for switching-noise sensitive applications. A shutdown pin
allows the LTC3813 to be turned off, reducing the supply
current to 240µA.
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 APPLICATIO
High Efficiency High Voltage Step-Up Converter
500k
VOUT
1000pF
0.01µF
100k
100pF
IOFF NDRV
PGOOD
BOOST
LTC3813
VRNG
TG
SYNC
SS
SHDN
ITH
VFB
SGND
SW
EXTVCC
DRVCC
INTVCC
SENSE+
BG
SENSE
BGRTN
50k
0.1µF
10µH
VIN
+ 10V TO 40V
22µF
M1
Si7850DP
VOUT
50V/5A
D1
MBR1100
M2
Si7850DP
×2
1µF
30.9k
+
270µF
×2
499
3813 TA01
Efficiency vs Load Current
100
VIN = 36V
95 VIN = 24V
VIN = 12V
90
85
80
012345
LOAD (A)
3813 TA01b
3813f
1



LTC3813
www.DataSheet4U.com
LTC3813
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltages
INTVCC, DRVCC ..................................... –0.3V to 14V
(DRVCC - BGRTN), (BOOST - SW) ........ –0.3V to 14V
BOOST ................................................ –0.3V to 114V
BGRTN ....................................................... –5V to 0V
EXTVCC ................................................. –0.3V to 15V
(NDRV - INTVCC) Voltage........................... –0.3V to 10V
SW, SENSE+ Voltage ................................... –1V to 100V
IOFF Voltage .............................................. –0.3V to 100V
SS Voltage ................................................... –0.3V to 5V
PGOOD Voltage............................................ –0.3V to 7V
VRNG, VOFF, SYNC, SHDN,
UVIN Voltages........................................ –0.3V to 14V
PLL/LPF, FB Voltages ................................ –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
PIN CONFIGURATION
IOFF 1
NC 2
NC 3
VOFF 4
VRNG 5
PGOOD 6
SYNC 7
ITH 8
VFB 9
PLL/LPF 10
SS 11
SGND 12
SHDN 13
UVIN 14
TOP VIEW
28 BOOST
27 TG
26 SW
25 SENSE+
24 NC
23 NC
22 NC
21 SENSE
20 BGRTN
19 BG
18 DRVCC
17 INTVCC
16 EXTVCC
15 NDRV
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 100°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3813EG#PBF
LTC3813EG#TRPBF
LTC3813EG
28-Lead Plastic SSOP
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 = DRVCC = VBOOST = VOFF = VRNG = SHDN = UVIN = VEXTVCC =
VNDRV = 10V, VSYNC = VSENSE+ = VSENSE= VBGRTN = VSW = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
INTVCC
IQ
IBOOST
INTVCC Supply Voltage
INTVCC Supply Current
INTVCC Shutdown Current
BOOST Supply Current
SHDN > 1.5V (Note 5)
SHDN = 0V
(Note 5)
SHDN = 0V
6.35
14
36
240 600
270 400
05
V
mA
µA
µA
µA
VFB Feedback Voltage
(Note 4)
0°C to 85°C
–40°C to 85°C
0.796
0.794
0.792
0.800
0.800
0.800
0.804
0.806
0.806
V
V
V
3813f
2







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)