900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Analog Devices Semiconductor Electronic Components Datasheet

LTC3894HFE Datasheet

Step-Down DC/DC Controller

No Preview Available !

LTC3894
150V Low IQ Step-Down
DC/DC Controller with
100% Duty Cycle Capability
FEATURES
n Wide Operating VIN Range: 4.5V to 150V
n Wide VOUT Range: 0.8V to 60V
n 9μA IQ when Regulating 48VIN to 3.3VOUT
n 16μA IQ when Regulating 12VIN to 3.3VOUT
n Very Low Dropout Operation: 100% Duty Cycle
n Adjustable Input Overvoltage Lockout
n Programmable PGOOD Undervoltage Monitor
n RSENSE or Inductor DCR Current Sensing
n Selectable High Efficiency Burst Mode® Operation or
Pulse-Skipping Mode at Light Loads
n Programmable Fixed Frequency: 50kHz to 850kHz
n Phase-Lockable Frequency: 75kHz to 800kHz
n Internal Fixed Soft-Start and External Programmable
Soft-Start or Voltage Tracking
n Strong MOSFET Gate Driver with Selectable
Undervoltage Lockout Thresholds
n Optional External NMOS for Gate Driver Bias in High
Power Applications
APPLICATIONS
n Automotive and Industrial Power Systems
n Telecommunication Power Systems
n Distributed Power Systems
DESCRIPTION
The LTC®3894 is a high voltage step-down DC/DC switch-
ing regulator controller. It drives a P-channel power
MOSFET switch allowing 100% duty cycle operation. It
enables a low part count, simple, and robust solution for
high reliability, high voltage applications.
The LTC3894 operates over a wide input voltage range
from 4.5V to 150V and can regulate output voltages
from 0.8V to 60V. It offers excellent light load efficiency,
drawing only 9μA quiescent current while regulating the
output voltage with no load. Its peak current mode, con-
stant frequency architecture provides for good control of
switching frequency and output current limit. The switch-
ing frequency can be programmed from 50kHz to 850kHz
with an external resistor and can be synchronized to an
external clock from 75kHz to 800kHz.
The LTC3894 offers programmable output voltage soft-
start or tracking. Safety features include overvoltage,
overcurrent and overtemperature protection with a power
good output monitor with adjustable threshold.
The LTC3894 is available in a thermally enhanced 20-Pin
TSSOP package with leads removed to accommodate
high voltage creepage and clearance requirements.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
High Efficiency 150V to 5V Step-Down Regulator
VIN
6V to 150V
12µF
×2
22µH 20mΩ
1nF 330µF
10µF
×2
0.47µF
3.3nF
5.76k
RUN GATE
VIN
CAP
OVLO
DRVUV/EXTG
EXTS
ITH GND FREQ
SENSE+ SENSE
PGOOD
LTC3894
PGUV
VFB
TRACK/SS PLLIN/MODE
47pF
36.5k
0.1µF
100k
422k
80.6k
VOUT
5V, 3A
3894 TA01a
Document Feedback
For more information www.analog.com
Efficiency and Power Loss vs
Load Current
100
10k
90 Burst Mode OPERATION
80
1k
70
60
EFFICIENCY
100
50
40
10
30
POWER LOSS
20
10
0
0.0001
0.001 0.01
VIN = 12V
VIN = 24V
0.1
1
1
0.1
3
LOAD CURRENT (A)
3894 TA01b
Rev. A
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3894HFE Datasheet

Step-Down DC/DC Controller

No Preview Available !

LTC3894
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN), RUN............... –0.3V to 150V
SENSE+, SENSE, PGOOD Voltage.............. –0.3V to 65V
VIN-VCAP Voltage......................................... –0.3V to 10V
VFB, PLLIN/MODE, PGUV, OVLO,
EXTS Voltages.............................................. –0.3V to 6V
TRACK/SS Voltage (Note 11)..................... –0.3V to 2.8V
ITH, FREQ Voltage........................................ –0.3V to 5V
DRVUV/EXTG Voltage................................... –0.3V to 9V
Operating Junction Temperature Range (Notes 2, 3)
LTC3894E, LTC3894I.......................... –40°C to 125°C
LTC3894H........................................... –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
GATE 1
TOP VIEW
20 VIN
RUN 3
18 CAP
SENSE+ 5
SENSE6
21
16 DRVUV/EXTG
GND
15 EXTS
ITH 7
14 OVLO
PGUV 8
13 FREQ
VFB 9
TRACK/SS 10
12 PGOOD
11 PLLIN/MODE
FE PACKAGE
20(16)-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 38°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB FOR RATED
ELECTRICAL AND THERMAL CHARACTERISTICS
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3894EFE#PBF
LTC3894EFE#TRPBF
LTC3894FE
20(16)-Lead Plastic TSSOP
–40°C to 125°C
LTC3894IFE#PBF
LTC3894IFE#TRPBF
LTC3894FE
20(16)-Lead Plastic TSSOP
–40°C to 125°C
LTC3894HFE#PBF
LTC3894HFE#TRPBF
LTC3894FE
20(16)-Lead Plastic TSSOP
–40°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Supply
VIN
Input Voltage Operating Range
(Note 4) DRVUV = 0V
VOUT
Regulated Output Voltage Set Point
IQ
No Load DC Supply Current (Note 5)
Shutdown VIN Pin Current
RUN = 0V
Sleep Mode VIN Pin Current
VSENSE– = 2.5V, VFB = 0.83V
VSENSE– ≥ 3.2V, VFB = 0.83V
Sleep Mode SENSEPin Current (Note 6) VSENSE– ≥ 3.2V, VFB = 0.83V
Pulse-Skipping Mode VIN Pin Current
VFB = 0.83V
VSENSE– = 0V
VSENSE– = 3.3V
VSENSE– = 5V
4.5
150
V
0.8
60
V
7
11
µA
27
40
µA
7
10
µA
21
30
µA
1.8
mA
1.5
mA
0.8
mA
Rev. A
2
For more information www.analog.com


Part Number LTC3894HFE
Description Step-Down DC/DC Controller
Maker Analog Devices
PDF Download

LTC3894HFE Datasheet PDF






Similar Datasheet

1 LTC3894HFE Step-Down DC/DC Controller
Analog Devices





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy