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LTC3405AES6-1.8#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC3405A-1.5/LTC3405A-1.8
3405a1518fa
■
High Efficiency: Up to 93%
■
Very Low Quiescent Current: Only 20
µ
A
During Operation
■
300mA Output Current at V
IN
= 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) ThinSOT
TM
Package
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.
■
Cellular Telephones
■
Personal Information Appliances
■
Wireless and DSL Modems
■
Digital Still Cameras
■
MP3 Players
■
Portable Instruments
Figure 1a. High Efficiency Step-Down Converter
1.5V, 1.8V, 1.5MHz, 300mA
Synchronous Step-Down
Regulators in ThinSOT
Figure 1b. Efficiency vs Load Current
, 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.
V
IN
C
IN
**
4.7µF
CER
V
IN
2.7V
TO 5.5V
*
**
LTC3405A-1.8
RUN
MODE
3
4.7µH*
3405A1518 F01
MURATA LQH3C4R7M34
TAIYO YUDEN JMK212BJ475MG
5
4
6
1
2
SW
V
OUT
GND
C
OUT
**
4.7µF
CER
V
OUT
1.8V
300mA
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
3405A1518 F01b
1 100
V
IN
= 2.7V
V
IN
= 5.5V
V
IN
= 4.2V
V
IN
= 3.6V
2
LTC3405A-1.5/LTC3405A-1.8
3405a1518fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
PK
Peak Inductor Current V
IN
= 3V, V
OUT
= 90%, Duty Cycle < 35% 375 500 625 mA
V
OUT
Regulated Output Voltage LTC3405A-1.5, MODE = 3.6V ● 1.455 1.500 1.545 V
LTC3405A-1.8, MODE = 3.6V
● 1.746 1.800 1.854 V
∆V
OVL
∆Output Overvoltage Lockout ∆V
OVL
= V
OVL
– V
OUT
2.5 7.8 13 %
∆V
OUT
Output Voltage Line Regulation V
IN
= 2.5V to 5.5V ● 0.04 0.4 %/V
V
LOADREG
Output Voltage Load Regulation 0.5 %
V
IN
Input Voltage Range ● 2.5 5.5 V
I
S
Input DC Bias Current (Note 4)
Pulse Skipping Mode V
OUT
= 90%, MODE = 3.6V, I
LOAD
= 0A 300 400 µA
Burst Mode
®
Operation V
OUT
= 103%, MODE = 0V, I
LOAD
= 0A 20 35 µA
Shutdown V
RUN
= 0V, V
IN
= 4.2V 0.1 1 µA
f
OSC
Oscillator Frequency V
OUT
= 100% ● 1.2 1.5 1.8 MHz
V
OUT
= 0V 170 kHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 100mA 0.7 0.85 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –100mA 0.6 0.90 Ω
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V ±0.01 ±1 µA
V
RUN
RUN Threshold ● 0.3 1 1.5 V
I
RUN
RUN Leakage Current ● ±0.01 ±1 µA
V
MODE
MODE Threshold ● 0.3 1.5 2 V
I
MODE
MODE Leakage Current ● ±0.01 ±1 µA
LTC3405AES6-1.5
LTC3405AES6-1.8
T
JMAX
= 125°C, θ
JA
= 250°C/ W
ORDER PART
NUMBER
(Note 1)
Input Supply Voltage .................................. –0.3V to 6V
MODE, RUN, V
OUT
Voltages....................... –0.3V to V
IN
SW Voltage .................................. –0.3V to (V
IN
+ 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
S6 PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 3.6V unless otherwise specified.
LTZQ
LTZP
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
RUN 1
GND 2
SW 3
6 MODE
5 V
OUT
4 V
IN
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
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: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC3405A: T
J
= T
A
+ (P
D
)(250°C/W)
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
3
LTC3405A-1.5/LTC3405A-1.8
3405a1518fa
INPUT VOLTAGE (V)
2.5 3.0 4.0 5.0
EFFICIENCY (%)
4.5
95
90
85
80
75
70
65
60
55
50
3405A1518 G02
3.5 5.5
Burst Mode OPERATION
V
OUT
= 1.8V
I
OUT
= 0.1mA
I
OUT
= 250mA
I
OUT
= 100mA
I
OUT
= 10mA
I
OUT
= 1mA
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
20
10
0
3405A1518 G03
1 100
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.8V
PULSE SKIPPING MODE
Burst Mode OPERATION
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
3405A1518 G04
1 100
V
IN
= 2.7V
V
IN
= 5.5V
V
IN
= 4.2V
V
IN
= 3.6V
V
OUT
= 1.8V
TYPICAL PERFOR A CE CHARACTERISTICS
UW
OUTPUT CURRENT (mA)
60
EFFICIENCY (%)
80
100
50
70
90
0.1 10 100 1000
3405A1518 G05
40
1
V
IN
= 2.7V
V
IN
= 4.2V
V
OUT
= 1.5V
V
IN
= 3.6V
Efficiency vs Input Voltage
Efficiency vs Output Current
Efficiency vs Output Current
Efficiency vs Output Current
Oscillator Frequency vs
Temperature
Oscillator Frequency vs
Supply Voltage
Output Voltage vs Load Current
R
DS(ON
) vs Input Voltage
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
25 75
–25 0
50 100 125
V
IN
= 3.6V
3405A1518 G07
SUPPLY VOLTAGE (V)
2
OSCILLATOR FREQUENCY (MHz)
1.8
1.7
1.6
1.5
1.4
1.3
1.2
34 56
3405A1518 G08
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
1.834
1.824
1.814
1.804
1.794
1.784
1.774
100
200 300 400
3405A1518 G09
500 600
Burst Mode
OPERATION
PULSE SKIPPING MODE
INPUT VOLTAGE (V)
0
R
DS(0N)
(Ω)
2
4
5
3405A1518 G10
13
6
7
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
MAIN SWITCH
SYNCHRONOUS
SWITCH
(From Figure1a)
R
DS(ON)
vs Temperature
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
1.2
1.0
0.8
0.6
0.4
0.2
0
25 75
–25 0
50 100 125
3405F G11
SYNCHRONOUS SWITCH
MAIN SWITCH
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3405AES6-1.8#TRPBF

Mfr. #:
Buy LTC3405AES6-1.8#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 300mA, 1.5MHz Sync Step-dwn cnvtr
Lifecycle:
New from this manufacturer.
Delivery:
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