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LTC3410BESC6-1.875#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC3410B
3410bfa
■
High Efficiency: Up to 96%
■
300mA Output Current at V
IN
= 3V
■
380mA Minimum Peak Switch Current
■
2.5V to 5.5V Input Voltage Range
■
2.25MHz Constant Frequency Operation
■
No Schottky Diode Required
■
Low Dropout Operation: 100% Duty Cycle
■
Stable with Ceramic Capacitors
■
0.8V Reference Allows Low Output Voltages
■
Shutdown Mode Draws < 1µA Supply Current
■
±2% Output Voltage Accuracy
■
Current Mode Operation for Excellent Line and
Load Transient Response
■
Overtemperature Protected
■
Available in Low Profile SC70 Package
The LTC
®
3410B is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. The device is available in adjustable
and fixed output voltage versions. Supply current during
operation is only 200µA, dropping to <1µA in shutdown.
The 2.5V to 5.5V input voltage range makes the LTC3410B
ideally suited for single Li-Ion battery-powered applica-
tions. 100% duty cycle provides low dropout operation,
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 2.25MHz, allowing
the use of small surface mount inductors and capacitors.
The LTC3410B 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. Low
output voltages are easily supported with the 0.8V feed-
back reference voltage. The LTC3410B is available in a
tiny, low profile SC70 package.
■
Cellular Telephones
■
Personal Information Appliances
■
Wireless and DSL Modems
■
Digital Still Cameras
■
MP3 Players
■
Portable Instruments
2.25MHz, 300mA
Synchronous Step-Down
Regulator in SC70
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
Efficiency and Power Loss
vs Output Current
V
IN
C
IN
2.2µF
CER
V
IN
2.7V
TO 5.5V
LTC3410B
RUN
4.7µH
10pF
232k
464k
3410 TA01
SW
V
FB
GND
C
OUT
2.2µF
CER
V
OUT
1.2V
POWER LOSS (W)
1
0.1
0.01
0.001
0.0001
OUTPUT CURRENT (mA)
1
40
EFFICIENCY (%)
50
60
70
80
10 100
1000
3410 TA01b
30
20
20
0
90
100
EFFICIENCY
POWER LOSS
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All
other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5994885, 6580258, 6304066, 6127815, 6498466, 6611131.
2
LTC3410B
3410bfa
Input Supply Voltage .................................. – 0.3V to 6V
RUN, V
FB
Voltages ..................................... – 0.3V to V
IN
SW Voltage (DC) ......................... –0.3V to (V
IN
+ 0.3V)
P-Channel Switch Source Current (DC) ............. 500mA
N-Channel Switch Sink Current (DC) ................. 500mA
ABSOLUTE AXI U RATI GS
WWWU
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
(Note 1)
LTC3410BESC6
ORDER PART NUMBER
SC6 PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
PACKAGE/ORDER I FOR ATIO
UU
W
T
JMAX
= 125°C, θ
JA
= 250°C/ W
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
LBZY
T
JMAX
= 125°C, θ
JA
= 250°C/ W
LTC3410BESC6-1.2
LTC3410BESC6-1.5
LTC3410BESC6-1.8
LTC3410BESC6-1.875
ORDER PART NUMBER
SC6 PART MARKING
LCMX
LCMY
LCMZ
LCHZ
RUN 1
GND 2
SW 3
6 V
FB
5 GND
4 V
IN
TOP VIEW
SC6 PACKAGE
6-LEAD PLASTIC SC70
RUN 1
GND 2
SW 3
6 V
OUT
5 GND
4 V
IN
TOP VIEW
SC6 PACKAGE
6-LEAD PLASTIC SC70
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current Adjustable Output Voltage ● ±30 nA
I
VOUT
Output Voltage Feedback Current Fixed Output Voltage ● 3.3 6 µA
I
PK
Peak Inductor Current V
IN
= 3V, V
FB
= 0.7V or V
OUT
= 90%, Duty Cycle < 35% 380 490 600 mA
V
FB
Regulated Feedback Voltage Adjustable Output Voltage (LTC3410BE) ● 0.784 0.8 0.816 V
∆V
FB
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V ● 0.04 0.4 %/V
V
OUT
Regulated Output Voltage LTC3410B-1.2, I
OUT
= 100mA ● 1.176 1.2 1.224 V
LTC3410B-1.5, I
OUT
= 100mA ● 1.47 1.5 1.53 V
LTC3410B-1.8, I
OUT
= 100mA ● 1.764 1.8 1.836 V
LTC3410B-1.875, I
OUT
= 100mA ● 1.837 1.875 1.913 V
∆V
OUT
Output Voltage Line Regulation V
IN
= 2.5V to 5.5V ● 0.04 0.4 %/V
V
LOADREG
Output Voltage Load Regulation I
LOAD
= 50mA to 250mA 0.5 %
V
IN
Input Voltage Range ● 2.5 5.5 V
V
UVLO
Undervoltage Lockout Threshold V
IN
Rising 2.0 2.3 V
V
IN
Falling 1.94 V
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
3
LTC3410B
3410bfa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Efficiency vs Input Voltage
Efficiency vs Output Current
(From Figure 1 Except for the Resistive Divider Resistor Values)
INPUT VOLTAGE (V)
2.5
EFFICIENCY (%)
50
60
70
4
5
3410 G01
40
30
20
3 3.5 4.5
80
90
100
5.5
I
OUT
= 250mA
I
OUT
= 10mA
I
OUT
= 1mA
V
OUT
= 1.2V
I
OUT
= 100mA
Reference Voltage vs
Temperature
TEMPERATURE (°C)
–50
REFERENCE VOLTAGE (V)
0.804
0.809
0.814
25 75
3410 G03
0.799
0.794
–25 0
50 100 125
0.789
0.784
V
IN
= 3.6V
OUTPUT CURRENT (mA)
1
40
EFFICIENCY (%)
50
60
70
80
10 100 1000
3410 G02
30
20
10
0
90
100
V
OUT
= 1.8V
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
S
Input DC Bias Current (Note 4)
Operating V
FB
= 0.83V or V
OUT
= 104%, I
LOAD
= 0A 200 300 µA
Shutdown V
RUN
= 0V 0.1 1 µA
f
OSC
Oscillator Frequency V
FB
= 0.8V or V
OUT
= 100% ● 1.8 2.25 2.7 MHz
V
FB
= 0V or V
OUT
= 0V 310 kHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 100mA 0.75 0.9 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –100mA 0.55 0.7 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
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: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3410BE is guaranteed to meet performance specifications
from 0°C to 85°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:
LTC3410B: 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.
Note 5: 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.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3410BESC6-1.875#TRMPBF

Mfr. #:
Buy LTC3410BESC6-1.875#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.875V, 300mA, 2.25MHz Synch Step-Dwn in SC70
Lifecycle:
New from this manufacturer.
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