900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3405AES6-1.375 Datasheet

Synchronous Step-Down Regulator

No Preview Available !

LTC3405A-1.375
1.375V, 1.5MHz, 300mA
Synchronous Step-Down
Regulators in ThinSOT
FEATURES
High Efficiency: Up to 90%
Very Low Quiescent Current: Only 20µA
During Operation
300mA Output Current at VIN = 3V
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Stable with Ceramic Capacitors
Shutdown Mode Draws < 1µA Supply Current
±3% Output Voltage Accuracy
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) ThinSOTTM Package
U
APPLICATIO S
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
DESCRIPTIO
The LTC®3405A-1.375 is a high efficiency monolithic
synchronous buck regulator using a constant frequency,
current mode architecture. Supply current during opera-
tion is only 20µA and drops to <1µA in shutdown. The 2.5V
to 5.5V input voltage range makes the LTC3405A-1.375
ideally suited for single Li-Ion battery-powered applica-
tions. 100% duty cycle provides low dropout operation,
extending battery life in portable systems.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The LTC3405A-1.375 is specifically designed to work well
with ceramic output capacitors, achieving very low output
voltage ripple and a small PCB footprint.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. The
LTC3405A-1.375 is available in a low profile (1mm)
ThinSOT package.
For other output voltages, refer to the LTC3405A and
LTC3405A-1.5/LTC3405A-1.8 data sheets.
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode
is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of
Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815,
6498466, 6611131.
TYPICAL APPLICATIO
VIN
2.7V
TO 5.5V
CIN
4.7µF
CER
VIN
SW
LTC3405A-1.375
4.7µH
RUN
MODE VOUT
GND
3405A1375 F01
COUT
4.7µF
CER
VOUT
1.375V
300mA
Figure 1a. High Efficiency Step-Down Converter
100
90
80
70
60
50
40
30
0.1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VIN = 5.5V
1
10
100
OUTPUT CURRENT (mA)
1000
3405A1375 F01b
Figure 1b. Efficiency vs Load Current
3405a1375f
1


Linear Technology Electronic Components Datasheet

LTC3405AES6-1.375 Datasheet

Synchronous Step-Down Regulator

No Preview Available !

LTC3405A-1.375
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage .................................. – 0.3V to 6V
MODE, RUN, VOUT Voltages....................... – 0.3V to VIN
SW Voltage .................................. – 0.3V to (VIN + 0.3V)
P-Channel Switch Source Current (DC) ............. 400mA
N-Channel Switch Sink Current (DC) ................. 400mA
Peak SW Sink and Source Current .................... 630mA
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RUN 1
GND 2
SW 3
6 MODE
5 VOUT
4 VIN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 250°C/ W
ORDER PART
NUMBER
LTC3405AES6-1.375
S6 PART MARKING
LTBRP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 3.6V unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IPK
VOUT
VOVL
VOUT
VLOADREG
VIN
IS
fOSC
Peak Inductor Current
Regulated Output Voltage
Output Overvoltage Lockout
Output Voltage Line Regulation
Output Voltage Load Regulation
Input Voltage Range
Input DC Bias Current
Pulse Skipping Mode
Burst Mode® Operation
Shutdown
Oscillator Frequency
RPFET
RNFET
ILSW
VRUN
IRUN
VMODE
IMODE
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
SW Leakage
RUN Threshold
RUN Leakage Current
MODE Threshold
MODE Leakage Current
VIN = 3V, VOUT = 1.238V, Duty Cycle < 35%
MODE = 3.6V
VOVL = VOVL – VOUT
VIN = 2.5V to 5.5V
(Note 4)
VOUT = 1.238V, MODE = 3.6V, ILOAD = 0A
VOUT = 1.42V, MODE = 0V, ILOAD = 0A
VRUN = 0V, VIN = 4.2V
VOUT = 1.375V
VOUT = 0V
ISW = 100mA
ISW = –100mA
VRUN = 0V, VSW = 0V or 5V, VIN = 5V
375 500 625
1.334 1.375 1.416
2
5.6
9.3
0.04
0.4
0.5
2.5
5.5
300 400
20
35
0.1
1
1.2
1.5
1.8
170
0.7
0.85
0.6
0.90
±0.01 ±1
0.3
1
1.5
±0.01 ±1
0.3
1.5
2
±0.01 ±1
UNITS
mA
V
%
%/V
%
V
µA
µA
µA
MHz
kHz
µA
V
µA
V
µA
Burst Mode is a registered trademark of Linear Technology Corporation.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3405A-1.375 is guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC3405A-1.375: TJ = TA + (PD)(250°C/W)
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
2
3405a1375f


Part Number LTC3405AES6-1.375
Description Synchronous Step-Down Regulator
Maker Linear
PDF Download

LTC3405AES6-1.375 Datasheet PDF






Similar Datasheet

1 LTC3405AES6-1.375 Synchronous Step-Down Regulator
Linear





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