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Linear Technology Electronic Components Datasheet

LTC3822EMSE Datasheet

Synchronous Step-Down DC/DC Controller

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LTC3822
No RSENSE™, Low Input
Voltage, Synchronous Step-Down
DC/DC Controller
FEATURES
n No Current Sense Resistor Required
n All N-Channel MOSFET Synchronous Drive
n High Current Outputs Possible
n Constant Frequency Current Mode Operation for
Excellent Line and Load Transient Response
n VIN: 2.75V to 4.5V
n ±1% 0.6V Reference
n Low Dropout Operation: 99% Duty Cycle
n Selectable Frequency (300kHz/550kHz/750kHz)
n Internal Soft-Start Circuitry
n Selectable Maximum Peak Current Sense Threshold
n Digital RUN Control Pin
n Output Overvoltage Protection
n Micropower Shutdown: IQ = 7.5μA
n Tiny Thermally Enhanced Leadless (3mm × 3mm)
DFN or 10-Lead MSOP Package
DESCRIPTION
The LTC®3822 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using few external components. The constant
frequency current mode architecture with MOSFET VDS
sensing eliminates the need for sense resistors and im-
proves efficiency.
A maximum duty cycle of 99% provides low dropout
operation. The switching frequency can be programmed
up to 750kHz, allowing the use of small surface mount
inductors and capacitors.
The LTC3822 is available in thermally enhanced DFN and
10-lead MSOP packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5481178, 5929620,
6580258, 6304066, 5847554, 6611131, 6498466.
APPLICATIONS
n 3.3VIN Systems
n Li-Ion Battery Systems
TYPICAL APPLICATION
1.8V/8A High Efficiency, 550kHz Step-Down Converter
IPRG
VIN
RUN
TG
FREQ
LTC3822 SW
ITH
5.1k
BOOST
680pF
GND
BG
VFB
59k 118k
0.22μF
FDS6898A
0.47μH
VIN
2.75V TO 4.5V
47μF
VOUT
1.8V
100μF 8A
3822 TA01
Efficiency and Power Loss vs
Load Current
100 VIN = 3.3V
90
80
10
EFFICIENCY
70
1
60
50
40
30
POWER LOSS
0.1
20
10
0
100
1000
LOAD CURRENT (mA)
0.01
10000
3822 TA01b
3822fa
1


Linear Technology Electronic Components Datasheet

LTC3822EMSE Datasheet

Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC3822
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ....................... –0.3V to 4.5V
BOOST Voltage .......................................... –0.3V to 10V
FREQ, RUN, IPRG Voltages............–0.3V to (VIN + 0.3V)
VFB, ITH Voltages ...................................... –0.3V to 2.4V
SW Voltage ........................................... –2V to VIN + 1V
TG, BG Peak Output Current (<10μs) ......................... 1A
Operating Temperature Range
(Note 2) ............................................... –40°C to 85°C
Storage Ambient Temperature Range..... –65°C to 125°C
Junction Temperature (Note 3) ............................ 125°C
Lead Temperature
(Soldering, 10 sec, MSE only) .......................... 300°C
PIN CONFIGURATION
TOP VIEW
BG 1
TG 2
BOOST 3
VIN 4
SW 5
10 RUN
9 ITH
11
8 VFB
7 IPRG
6 FREQ
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD IS GND
(MUST BE SOLDERED TO PCB)
BG 1
TG 2
BOOST 3
VIN 4
SW 5
TOP VIEW
11
10 RUN
9 ITH
8 VFB
7 IPRG
6 FREQ
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD IS GND
(MUST BE SOLDERED TO PCB)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3822EDD#PBF
LTC3822EDD#TRPBF LCBF
10-Lead (3mm × 3mm) Plastic DFN
LTC3822EMSE#PBF
LTC3822EMSE#TRPBF LTCBG
10-Lead Plastic MSOP
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
–40°C to 85°C
3822fa
2


Part Number LTC3822EMSE
Description Synchronous Step-Down DC/DC Controller
Maker Linear Technology
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