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Linear Technology Electronic Components Datasheet

LTC3833IFE Datasheet

Fast Accurate Step-Down DC/DC Controller

No Preview Available !

FEATURES
n Wide VIN Range: 4.5V to 38V
n VOUT Range: 0.6V to 5.5V
n Output Accuracy: ±0.25% at 25°C and ±0.67%
over Temperature
n Differential Output Sensing Allowing Up to 500mV
Line Loss
n Fast Load Transient Response
n tON(MIN) = 20ns, tOFF(MIN) = 90ns
n Controlled On-Time Valley Current Mode
Architecture
n Frequency Programmable from 200kHz to 2MHz
and Synchronizable to External Clock
n RSENSE or Inductor DCR Current Sensing
n Overvoltage Protection and Current Limit Foldback
n Power Good Output Voltage Monitor
n Output Tracking or Adjustable Soft-Start
n External VCC Input for Bypassing Internal LDO
n 20-Pin QFN (3mm × 4mm) and TSSOP Packages
APPLICATIONS
n Distributed Power Systems
n Point-of-Load Converters
n Computing Systems
n Datacomm Systems
LTC3833
Fast Accurate Step-Down
DC/DC Controller with
Differential Output Sensing
DESCRIPTION
The LTC®3833 is a synchronous step-down DC/DC
switching regulator controller targeted for high power
applications. It drives all N-channel power MOSFETs. The
controlled on-time valley current mode architecture allows
for both fast transient response and constant frequency
switching in steady-state operation, independent of VIN,
VOUT and load current.
Differential output voltage sensing along with a precision
internal reference combine to offer ±0.67% output regula-
tion and the ability to correct for up to ±500mV variations
in the output terminals due to line losses. The operating
frequency can be programmed from 200kHz to 2MHz with
an external resistor and can be synchronized to an external
clock for noise and EMI sensitive applications.
Very low tON and tOFF times allow for near 0% and near
100% duty cycles, respectively. Programmable soft-start or
output voltage tracking is available. Safety features include
output overvoltage protection, programmable current limit
with foldback, and a power good output signal.
L, LT, LTC, LTM, OPTI-LOOP, PolyPhase, µModule, Linear Technology and the Linear logo
are registered trademarks and Hot Swap, No RSENSE and UltraFast are trademarks 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.
TYPICAL APPLICATION
1.5V, 20A, 300kHz High Current Step-Down Converter
INTVCC
VRNG
100k
PGOOD
VIN
VOUT
SENSE
SENSE+
RUN
TG
0.1µF
LTC3833
SW
470pF
10k
137k
TRACK/SS
ITH
RT
BOOST
INTVCC
EXTVCC
BG
300kHz
SGND
PGND
MODE/PLLIN
VOSNS+
VOSNS–
VIN
4.5V TO 14V
180µF
0.1µF
INTVCC
4.7µF
0.1µF
3.24k
0.47µH
15k
10k
VOUT
1.5V
20A
330µF
×2
3833 TA01a
Efficiency
100
PULSE-SKIPPING
MODE
90
80
FORCED
CONTINUOUS
MODE
70
60
50
40
0.1
VIN = 12V
VOUT = 1.5V
1
10
100
LOAD CURRENT (A)
3833 TA01b
3833f
1


Linear Technology Electronic Components Datasheet

LTC3833IFE Datasheet

Fast Accurate Step-Down DC/DC Controller

No Preview Available !

LTC3833
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN Voltage ................................................. –0.3V to 40V
BOOST Voltage........................................... –0.3V to 46V
SW Voltage.................................................... –5V to 40V
INTVCC, EXTVCC, (BOOST-SW), PGOOD, RUN,
MODE/PLLIN, VRNG Voltages........................ –0.3V to 6V
VOUT, SENSE+, SENSEVoltages................... –0.6V to 6V
VOSNS+, VOSNS– Voltages......... –0.6V to (INTVCC + 0.3V)
RT, ITH Voltages...................... –0.3V to (INTVCC + 0.3V)
TRACK/SS Voltages...................................... –0.3V to 5V
Operating Junction Temperature Range
(Notes 2, 3, 4)......................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE Package........................................................ 300°C
PIN CONFIGURATION
TOP VIEW
VOSNS– 1
VOSNS+ 2
TRACK/SS 3
ITH 4
VRNG 5
RT 6
20 19 18 17
21
SGND
16 BOOST
15 TG
14 SW
13 BG
12 PGND
11 INTVCC
7 8 9 10
UDC PACKAGE
20-LEAD (3mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB
PGOOD 1
SENSE+ 2
SENSE3
VOUT 4
VOSNS– 5
VOSNS+ 6
TRACK/SS 7
ITH 8
VRNG 9
RT 10
TOP VIEW
21
SGND
20 BOOST
19 TG
18 SW
17 BG
16 PGND
15 INTVCC
14 VIN
13 MODE/PLLIN
12 EXTVCC
11 RUN
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 38°C/W
EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3833EUDC#PBF
LTC3833EUDC#TRPBF LFGT
20-Lead (3mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3833IUDC#PBF
LTC3833IUDC#TRPBF LFGT
20-Lead (3mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3833EFE#PBF
LTC3833EFE#TRPBF
LTC3833FE
20-Lead Plastic TSSOP
–40°C to 125°C
LTC3833IFE#PBF
LTC3833IFE#TRPBF
LTC3833FE
20-Lead Plastic TSSOP
–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/
3833f
2


Part Number LTC3833IFE
Description Fast Accurate Step-Down DC/DC Controller
Maker Linear Technology
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