OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC3419IMS-1#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3419
1
3419fa
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
POWER LOSS (W)
10
1
0.1
0.01
0.001
0.0001
0.1 10 100 1000
3419 TA01b
1
V
OUT
= 1.2V
V
OUT
= 1.8V
V
OUT
= 2.5V
V
IN
= 3.6V
n
Cellular Telephones
n
Digital Still Cameras
n
Wireless and DSL Modems
n
Portable Media Players
n
PDAs/Palmtop PCs
FEATURES
APPLICATIONS
DESCRIPTION
Dual Monolithic 600mA
Synchronous Step-Down
Regulator
The LTC
®
3419 is a dual, 2.25MHz, constant-frequency,
synchronous step-down DC/DC converter in a tiny
3mm × 3mm DFN package. 100% duty cycle provides
low dropout operation, extending battery life in portable
systems. Low output voltages are supported with the 0.6V
feedback reference voltage. Each regulator can supply
600mA output current.
The input voltage range is 2.5V to 5.5V, making it ideal
for Li-Ion and USB powered applications. Supply current
during operation is only 35μA and drops to <1μA in
shutdown. A user-selectable mode input allows the user
to trade off between high effi ciency Burst Mode operation
and pulse-skipping mode.
An internally set 2.25MHz switching frequency allows the
use of tiny surface mount inductors and capacitors. Internal
soft-start reduces inrush current during start-up. Both
outputs are internally compensated to work with ceramic
output capacitors. The LTC3419 is available in a low profi le
(0.75mm) 3mm × 3mm DFN package. The LTC3419 is also
available in a fi xed output voltage confi guration selected
via internal resistor dividers (see Table 2).
Dual Monolithic Buck Regulator in 8-Lead 3 × 3 DFN
n
High Effi ciency Dual Step-Down Outputs: Up to 96%
n
600mA Current per Channel at V
IN
= 3V
n
Only 35μA Quiescent Current During Operation
(Both Channels)
n
2.25MHz Constant-Frequency Operation
n
2.5V to 5.5V Input Voltage Range
n
Low Dropout Operation: 100% Duty Cycle
n
No Schottky Diodes Required
n
Internally Compensated for All Ceramic Capacitors
n
Independent Internal Soft-Start for Each Channel
n
Available in Fixed Output Versions
n
Current Mode Operation for Excellent Line and Load
Transient Response
n
0.6V Reference Allows Low Output Voltages
n
User-Selectable Burst Mode
®
Operation
n
Short-Circuit Protected
n
Ultralow Shutdown Current: I
Q
< 1μA
n
Available in Small MSOP or 3mm × 3mm DFN-8
Packages
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents,
including
5481178, 6127815, 6304066, 6498466, 6580258, 6611131.
Effi ciency and Power Loss
vs Output Current
V
IN
RUN2 RUN1
LTC3419
V
FB2
SW2
SW1
MODE
V
FB1
22pF 22pF
GND
V
IN
2.5V TO 5.5V
V
OUT2
1.8V AT
600mA
V
OUT1
2.5V AT
600mA
3419 TA01
118k 187k
59k 59k
3.3
μH3.3μH
10μF
10
μF
10
μF
TYPICAL APPLICATION
LTC3419
2
3419fa
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (V
IN
) ............................. –0.3 to 6V
V
FB1
, V
FB2
........................................–0.3V to V
IN
+ 0.3V
RUN1, RUN2, MODE ........................ –0.3V to V
IN
+ 0.3V
SW1, SW2 ....................................... –0.3V to V
IN
+ 0.3V
P-Channel SW Source Current (DC) (Note 2) .......800mA
N-Channel SW Source Current (DC) (Note 2) ......800mA
(Note 1)
TOP VIEW
DD PACKAGE
8-LEAD
(
3mm s 3mm
)
PLASTIC DFN
5
6
7
8
9
4
3
2
1V
FB1
RUN1
MODE
SW1
V
FB2
RUN2
SW2
V
IN
T
JMAX
= 125°C, θ
JA
= 40°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
V
FB1
RUN1
MODE
SW1
GND
10
9
8
7
6
V
FB2
RUN2
SW2
V
IN
GND
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 120°C/W
Peak SW Source and Sink Current (Note 2) .............1.3A
Operating Junction Temperature Range
(Note 3) .................................................–40 to 125°C
Junction Temperature (Note 6) ............................. 125°C
Storage Temperature Range ...................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Package ................................................. 300°C
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3419EDD#PBF LTC3419EDD#TRPBF LCQJ
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3419EDD-1#PBF LTC3419EDD-1#TRPBF LCWW
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3419IDD#PBF LTC3419IDD#TRPBF LCQJ
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3419IDD-1#PBF LTC3419IDD-1#TRPBF LCWW
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3419EMS#PBF LTC3419EMS#TRPBF LTCQK 10-Lead Plastic MSOP –40°C to 125°C
LTC3419EMS-1#PBF LTC3419EMS-1#TRPBF LTCWX 10-Lead Plastic MSOP –40°C to 125°C
LTC3419IMS#PBF LTC3419IMS#TRPBF LTCQK 10-Lead Plastic MSOP –40°C to 125°C
LTC3419IMS-1#PBF LTC3419IMS-1#TRPBF LTCWX 10-Lead Plastic MSOP –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www.linear.com/tapeandreel/
LTC3419
3
3419fa
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: Guaranteed by long term current density limitations.
Note 3: The LTC3419E and LTC3419E-1 are guaranteed to meet specifi ed
performance from 0°C to 85°C. Specifi cations over the –40°C to 125°C
operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3419I and LTC3419I-1 are guaranteed to meet specifi ed performance
over the full –40°C to 125°C operating junction temperature range.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
V
IN
Operating Voltage
●
2.5 5.5 V
V
UV
V
IN
Undervoltage Lockout V
IN
Low to High
●
2.1 2.5 V
I
FB
Feedback Pin Input Current LTC3419
LTC3419-1
●
●
3
±30
5
nA
μA
V
FBREG1
Regulated Feedback Voltage (Channel 1) LTC3419E, 0°C < T
J
< 85°C
LTC3419E, –40°C < T
J
< 85°C
LTC3419E-1, –40°C < T
J
< 85°C
LTC3419I, –40°C < T
J
< 125°C
LTC3419I-1, –40°C < T
J
< 125°C
●
●
●
●
0.590
0.588
1.544
0.582
1.533
0.600
0.600
1.575
0.6
1.575
0.610
0.612
1.606
0.618
1.617
V
V
V
V
V
V
FBREG2
Regulated Feedback Voltage (Channel 2) LTC3419E, 0°C < T
J
< 85°C
LTC3419E, –40°C < T
J
< 85°C
LTC3419E-1, –40°C < T
J
< 85°C
LTC3419I, –40°C < T
J
< 125°C
LTC3419I-1, –40°C < T
J
< 125°C
●
●
●
●
0.590
0.588
1.764
0.582
1.753
0.600
0.600
1.8
0.6
1.8
0.610
0.612
1.836
0.618
1.847
V
V
V
V
V
ΔV
LINE REG
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 7) 0.3 0.5 %/V
ΔV
LOAD REG
Output Voltage Load Regulation I
LOAD
= 0mA to 600mA (Note 7) 0.5 %
I
S
Input DC Supply Current
Active Mode (Note 4)
Sleep Mode
Shutdown
V
FB1
= V
FB2
= 0.95 × V
FBREG
V
FB1
= V
FB2
= 1.05 × V
FBREG
, V
IN
= 5.5V
RUN1 = RUN2 = 0V, V
IN
= 5.5V
500
35
0.1
700
60
1
μA
μA
μA
f
OSC
Oscillator Frequency V
FB
= V
FBREG
●
1.8 2.25 2.7 MHz
I
LIM
Peak Switch Current Limit
Channel 1 (600mA)
Channel 2 (600mA)
V
IN
= 3V, V
FB
< V
FBREG
, Duty Cycle < 35%
900
900
1200
1200
mA
mA
R
DS(ON)
Channel 1 (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
Channel 2 (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
V
IN
= 3.6V, I
SW
= 100mA
V
IN
= 3.6V, I
SW
= 100mA
V
IN
= 3.6V, I
SW
= 100mA
V
IN
= 3.6V, I
SW
= 100mA
0.4
0.4
0.4
0.4
0.6
0.6
0.6
0.6
Ω
Ω
Ω
Ω
I
SW(LKG)
Switch Leakage Current V
IN
= 5V, V
RUN
= 0V 0.01 1 μA
t
SOFTSTART
Soft-Start Time V
FB
from 10% to 90% Full Scale 0.1 0.95 1.3 ms
V
RUN
RUN Threshold High
●
0.4 1 1.2 V
I
RUN
RUN Leakage Current
●
0.01 1 μA
V
MODE
MODE Threshold High
●
0.4 1 1.2 V
I
MODE
MODE Leakage Current
●
0.01 1 μA
V
BURST
Output Ripple in Burst Mode Operation V
OUT
= 1.5V, C
OUT
= 10μF 20 mV
P-P
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are at T
A
= 25°C, V
IN
= 3.6V, unless otherwise noted.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
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 specifi ed maximum operating junction
temperature may impair device reliability.
Note 7: The converter is tested in a proprietary test mode that connects
the output of the error amplifi er to the SW pin, which is connected to an
external servo loop.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3419IMS-1#TRPBF

Mfr. #:
Buy LTC3419IMS-1#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual 600mA, 2.25MHz Synchronous Step-Down
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet