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LTC3406BES5-1.8#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC34 06B
3406bfa
■
High Efficiency: Up to 96%
■
600mA 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
■
Low Quiescent Current: 300µA
■
0.6V Reference Allows Low Output Voltages
■
Shutdown Mode Draws <1µA Supply Current
■
Current Mode Operation for Excellent Line and
Load Transient Response
■
Overtemperature Protected
■
Low Profile (1mm) ThinSOT
TM
Package
The LTC
®
3406B is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. The device is available in an adjustable
version and fixed output voltages of 1.5V and 1.8V. Supply
current with no load is 300µA and drops to <1µA in
shutdown. The 2.5V to 5.5V input voltage range makes the
LTC3406B ideally suited for single Li-Ion battery-powered
applications. 100% duty cycle provides low dropout op-
eration, extending battery life in portable systems. PWM
pulse skipping mode operation provides very low output
ripple voltage for noise sensitive applications.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The LTC3406B is available in a low
profile (1mm) ThinSOT package. Refer to LTC3406 for
applications that require Burst Mode
®
operation.
■
Cellular Telephones
■
Personal Information Appliances
■
Wireless and DSL Modems
■
Digital Still Cameras
■
MP3 Players
■
Portable Instruments
Figure 1a. High Efficiency Step-Down Converter
1.5MHz, 600mA
Synchronous Step-Down
Regulator in ThinSOT
Figure 1b. Efficiency vs Load Current
, 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.
Protected by U.S. Patents, including 6580258, 5481178.
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
V
IN
C
IN
**
4.7µF
CER
V
IN
2.7V
TO 5.5V
*
**
†
LTC3406B-1.8
RUN
3
2.2µH*
3406B F01a
MURATA LQH32CN2R2M33
TAIYO YUDEN JMK212BJ475MG
TAIYO YUDEN JMK316BJ106ML
5
4
1
2
SW
V
OUT
GND
C
OUT
†
10µF
CER
V
OUT
1.8V
600mA
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
20
10
3406B F01b
1 100
V
IN
= 2.7V
V
OUT
= 1.8V
V
IN
= 3.6V
V
IN
= 4.2V
2
LTC34 06B
3406bfa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current ● ±30 nA
V
FB
Regulated Feedback Voltage LTC3406B (Note 4) T
A
= 25°C 0.5880 0.6 0.6120 V
LTC3406B (Note 4) 0°C ≤ T
A
≤ 85°C 0.5865 0.6 0.6135 V
LTC3406B (Note 4) –40°C ≤ T
A
≤ 85°C ● 0.5850 0.6 0.6150 V
∆V
FB
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 4) ● 0.04 0.4 %/V
V
OUT
Regulated Output Voltage LTC3406B-1.5 ● 1.455 1.500 1.545 V
LTC3406B-1.8
● 1.746 1.800 1.854 V
∆V
OVL
Output Overvoltage Lockout ∆V
OVL
= V
OVL
– V
FB
, LTC3406B 20 50 80 mV
∆V
OVL
= V
OVL
– V
OUT
, LTC3406B-1.5/LTC3406B-1.8 2.5 7.8 13 %
∆V
OUT
Output Voltage Line Regulation V
IN
= 2.5V to 5.5V ● 0.04 0.4 %
I
PK
Peak Inductor Current V
IN
= 3V, V
FB
= 0.5V or V
OUT
= 90%, 0.75 1 1.25 A
Duty Cycle < 35%
V
LOADREG
Output Voltage Load Regulation 0.5 %/V
V
IN
Input Voltage Range ● 2.5 5.5 V
I
S
Input DC Bias Current (Note 5)
V
FB
= 0.5V or V
OUT
= 90% 300 400 µA
Shutdown V
RUN
= 0V, V
IN
= 4.2V 0.1 1 µA
f
OSC
Oscillator Frequency V
FB
= 0.6V or V
OUT
= 100% ● 1.2 1.5 1.8 MHz
V
FB
= 0V or V
OUT
= 0V 210 kHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 100mA 0.4 0.5 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –100mA 0.35 0.45 Ω
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V ±0.01 ±1 µA
LTC3406BES5
T
JMAX
= 125°C, θ
JA
= 250°C/ W, θ
JC
= 90°C/ W
ORDER PART
NUMBER
Input Supply Voltage .................................. – 0.3V to 6V
RUN, V
FB
Voltages ..................................... – 0.3V to V
IN
SW Voltage .................................. –0.3V to (V
IN
+ 0.3V)
P-Channel Switch Source Current (DC) ............. 800mA
N-Channel Switch Sink Current (DC) ................. 800mA
S5 PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTE2
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
Peak SW Sink and Source Current ........................ 1.3A
Operating Temperature Range (Note 2) .. –40°C to 85°C
Junction Temperature (Notes 3, 6) ...................... 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
LTC3406BES5-1.5
LTC3406BES5-1.8
ORDER PART
NUMBER
S5 PART MARKING
LTE3
LTE4
T
JMAX
= 125°C, θ
JA
= 250°C/ W, θ
JC
= 90°C/ W
RUN 1
GND 2
SW 3
5 V
OUT
4 V
IN
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
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.
ELECTRICAL CHARACTERISTICS
RUN 1
GND 2
SW 3
5 V
FB
4 V
IN
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
3
LTC34 06B
3406bfa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RUN
RUN Threshold ● 0.3 1 1.5 V
I
RUN
RUN Leakage Current ● ±0.01 ±1 µA
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.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3406BE 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:
LTC3406B: T
J
= T
A
+ (P
D
)(250°C/W)
Note 4: The LTC3406B is tested in a proprietary test mode that connects
V
FB
to the output of the error amplifier.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Efficiency vs Input Voltage
Efficiency vs Output Current
Efficiency vs Output Current
Efficiency vs Output Current
Reference Voltage vs
Temperature
Oscillator Frequency vs
Temperature
(From Figure1a Except for the Resistive Divider Resistor Values)
TEMPERATURE (°C)
–50
REFERENCE VOLTAGE (V)
0.614
0.609
0.604
0.599
0.594
0.589
0.584
25 75
–25 0
50 100 125
V
IN
= 3.6V
3406B G05
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
3406B G06
INPUT VOLTAGE (V)
2
EFFICIENCY (%)
6
3406B G01
3
4
5
100
95
90
85
80
75
70
65
60
55
50
I
OUT
= 600mA
I
OUT
= 100mA
I
OUT
= 10mA
T
A
= 25°C
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
20
10
3406B GO2
1 100
V
OUT
= 1.2V
T
A
= 25°C
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
20
10
3406B GO3
1 100
V
OUT
= 1.5V
T
A
= 25°C
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
20
10
3406B G04
1 100
V
OUT
= 2.5V
T
A
= 25°C
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
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LTC3406BES5-1.8#TRMPBF

Mfr. #:
Buy LTC3406BES5-1.8#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 600mA, 1.5MHz Sync Step-dwn in ThinSOT w/ burst defeat mode
Lifecycle:
New from this manufacturer.
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