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Linear Technology Electronic Components Datasheet

LTC3405AES6-1.8 Datasheet

Synchronous Step-Down Regulators

No Preview Available !

LTC3405A-1.5/LTC3405A-1.8
1.5V, 1.8V, 1.5MHz, 300mA
Synchronous Step-Down
Regulators in ThinSOT
FEATURES
High Efficiency: Up to 93%
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
TYPICAL APPLICATIO
VIN
2.7V
TO 5.5V
CIN**
4.7µF
CER
4
VIN
3 4.7µH*
SW
LTC3405A-1.8
1
RUN
6
5
MODE VOUT
GND
2
3405A1518 F01
*MURATA LQH3C4R7M34
**TAIYO YUDEN JMK212BJ475MG
VOUT
1.8V
300mA
COUT**
4.7µF
CER
Figure 1a. High Efficiency Step-Down Converter
DESCRIPTIO
The LTC®3405A-1.5/LTC3405A-1.8 are high efficiency
monolithic synchronous buck regulators using a constant
frequency, current mode architecture. Supply current
during operation is only 20µA and drops to <1µA in
shutdown. The 2.5V to 5.5V input voltage range makes the
LTC3405A-1.5/LTC3405A-1.8 ideally suited for single
Li-Ion battery-powered applications. 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-1.5/LTC3405A-1.8 are 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-1.5/LTC3405A-1.8 are available in a low profile
(1mm) ThinSOT package.
For adjustable output voltage, refer to the LTC3405A data
sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6580258, 5481178.
100
VIN = 2.7V
90
80
VIN = 3.6V
VIN = 4.2V
70
VIN = 5.5V
60
50
40
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3405A1518 F01b
Figure 1b. Efficiency vs Load Current
3405a1518fa
1


Linear Technology Electronic Components Datasheet

LTC3405AES6-1.8 Datasheet

Synchronous Step-Down Regulators

No Preview Available !

LTC3405A-1.5/LTC3405A-1.8
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
LTC3405AES6-1.5
LTC3405AES6-1.8
S6 PART MARKING
LTZQ
LTZP
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
Peak Inductor Current
VOUT
Regulated Output Voltage
VIN = 3V, VOUT = 90%, Duty Cycle < 35%
LTC3405A-1.5, MODE = 3.6V
LTC3405A-1.8, MODE = 3.6V
375 500 625
1.455 1.500 1.545
1.746 1.800 1.854
VOVL
VOUT
VLOADREG
VIN
IS
fOSC
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
VOVL = VOVL – VOUT
VIN = 2.5V to 5.5V
(Note 4)
VOUT = 90%, MODE = 3.6V, ILOAD = 0A
VOUT = 103%, MODE = 0V, ILOAD = 0A
VRUN = 0V, VIN = 4.2V
VOUT = 100%
VOUT = 0V
ISW = 100mA
ISW = –100mA
VRUN = 0V, VSW = 0V or 5V, VIN = 5V
2.5
7.8
13
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
%
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 LTC3405AE 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: 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
3405a1518fa


Part Number LTC3405AES6-1.8
Description Synchronous Step-Down Regulators
Maker Linear
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LTC3405AES6-1.8 Datasheet PDF






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