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LTC3407EMSE-4#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3407-4
1
34074fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Synchronous, 800mA,
2.25MHz Step-Down
DC/DC Regulator
The LTC
®
3407-4 is a dual, constant frequency, synchro-
nous step down DC/DC converter. Intended for low power
applications, it operates from 2.5V to 5.5V input voltage
range and has a constant 2.25MHz switching frequency,
allowing the use of tiny, low cost capacitors and induc-
tors with a profi le ≤1mm. Each output voltage is adjust-
able from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A
power switches provide high effi ciency without the need
for external Schottky diodes.
A user selectable mode input is provided to allow the user
to trade-off noise ripple for low power effi ciency. Burst
Mode
®
operation provides high effi ciency at light loads,
while pulse-skipping mode provides low noise ripple at
light loads.
To further maximize battery life, the P-channel MOSFETs
are turned on continuously in dropout (100% duty cycle),
and both channels draw a total quiescent current of only
40μA. In shutdown, the device draws <1μA.
The LTC3407-4 is identical to the LTC3407-2 except for
the reduced power-on reset delay time.
Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators
n
High Effi ciency: Up to 95%
n
Very Low Quiescent Current: Only 40μA
n
2.25MHz Constant Frequency Operation
n
High Switch Current: 1.2A on Each Channel
n
No Schottky Diodes Required
n
Low R
DS(ON)
Internal Switches: 0.35Ω
n
Current Mode Operation for Excellent Line
and Load Transient Response
n
Short-Circuit Protected
n
Low Dropout Operation: 100% Duty Cycle
n
Ultralow Shutdown Current: I
Q
< 1μA
n
Output Voltages from 5V down to 0.6V
n
Power-On Reset Output
n
Externally Synchronizable Oscillator
n
Small Thermally Enhanced MSOP and 3mm × 3mm
DFN Packages
n
PDAs/Palmtop PCs
n
Digital Cameras
n
Cellular Phones
n
Portable Media Players
n
PC Cards
n
Wireless and DSL Modems
LTC3407-4 Effi ciency/Power Loss Curve
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (W)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
34074 TA02
0
0.001
1
0.1
0.01
0.0001
1
RUN2 V
IN
V
IN
*
2.5V TO 5.5V
V
OUT2
2.5V
800mA
V
OUT1
1.8V
800mA
RUN1
POR
SW1
V
FB1
GND
V
FB2
SW2
MODE/SYNC
LTC3407-4
C1
10μF
R5
100k
RESET
C4, 22pFC5, 22pF
L1
2.2μH
L2
2.2μH
R4
887k
R2
604k
R1
301k
R3
280k
C3
10μF
C2
10μF
3407 TA01
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML L1, L2: MURATA LQH32CN2R2M33
*V
OUT
CONNECTED TO V
IN
FOR V
IN
≤ 2.8V
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466,
6611131.
LTC3407-4
2
34074fa
ABSOLUTE MAXIMUM RATINGS
V
IN
Voltages .................................................–0.3V to 6V
V
FB1
, V
FB2
Voltages .......................... –0.3V to V
IN
+ 0.3V
RUN1, RUN2 Voltages .................................–0.3V to V
IN
MODE/SYNC Voltage ....................................–0.3V to V
IN
SW1, SW2 Voltage ........................... –0.3V to V
IN
+ 0.3V
POR Voltage ................................................. –0.3V to 6V
(Note 1)
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
11
9
6
7
8
4
5
3
2
1
V
FB2
RUN2
POR
SW2
MODE/
SYNC
V
FB1
RUN1
V
IN
SW1
GND
T
JMAX
= 125°C, θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO GND
TOP VIEW
1
2
3
4
5
V
FB1
RUN1
V
IN
SW1
GND
10
9
8
7
6
V
FB2
RUN2
POR
SW2
MODE/
SYNC
11
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO GND
PIN CONFIGURATION
ELECTRICAL CHARACTERISTICS
Ambient Operating Temperature
Range (Note 2) ......................................... –40°C to 85°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range ...................– 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
LTC3407EMSE-4 only ....................................... 300°C
Refl ow Peak Body Temperature ............................ 260°C
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, unless otherwise specifi ed. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage Range
●
2.5 5.5 V
I
FB
Feedback Pin Input Current
●
30 nA
V
FB
Feedback Voltage (Note 3) 0°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 85°C ●
0.588
0.585
0.6
0.6
0.612
0.612
V
V
ΔV
LINE REG
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 3) 0.3 0.5 %/V
ΔV
LOAD REG
Output Voltage Load Regulation (Note 3) 0.5 %
I
S
Input DC Supply Current (Note 4)
Active Mode
Sleep Mode
Shutdown
V
FB1
= V
FB2
= 0.5V
V
FB1
= V
FB2
= 0.63V, MODE/SYNC = 3.6V
RUN = 0V, V
IN
= 5.5V, MODE/SYNC = 0V
700
40
0.1
950
60
1
μA
μA
μA
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3407EDD-4#PBF LTC3407EDD-4#TRPBF LCJD 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC3407EMSE-4#PBF LTC3407EMSE-4#TRPBF LTCJC 10-Lead (3mm × 3mm) Plastic MSOP –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
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/
LTC3407-4
3
34074fa
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. Pins of regulators should not exceed 6V
Note 2: The LTC3407E-4 is guaranteed to meet specifi ed performance
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, unless otherwise specifi ed. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
OSC
Oscillator Frequency V
FBX
= 0.6V
●
1.8 2.25 2.7 MHz
f
SYNC
Synchronization Frequency 2.25 MHz
I
LIM
Peak Switch Current Limit V
IN
= 3V, V
FBX
= 0.5V, Duty Cycle <35% 0.95 1.2 1.6 A
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
(Note 6)
(Note 6)
0.35
0.30
0.45
0.45
Ω
Ω
I
SW(LKG)
Switch Leakage Current V
IN
= 5V, V
RUN
= 0V, V
FBX
= 0V 0.01 1 μA
POR Power-On Reset Threshold V
FBX
Ramping Up, MODE/SYNC = 0V
V
FBX
Ramping Down, MODE/SYNC = 0V
8.5
–8.5
%
%
Power-On Reset On-Resistance 100 200 Ω
Power-On Reset Delay 65536 Cycles
V
RUN
RUN Threshold
●
0.3 1 1.5 V
I
RUN
RUN Leakage Current
●
0.01 1 μA
V
MODE
MODE Threshold Low 0 0.5 V
MODE Threshold High V
IN
– 0.5 V
IN
V
Note 3: The LTC3407-4 is tested in a proprietary test mode that connects
V
FB
to the output of the error amplifi er.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T
J
is calculated from the ambient T
A
and power dissipation P
D
according to the following formula: T
J
= T
A
+ (P
D
• θ
JA
).
Note 6: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise specifi ed.
Burst Mode Operation Pulse-Skipping Mode Load Step
SW
5V/DIV
V
OUT
20mV/DIV
I
L
200mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA
2μs/DIV
34073 G01
SW
5V/DIV
V
OUT
20mV/DIV
I
L
200mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 20mA
1μs/DIV
34073 G02
I
L
500mA/DIV
V
OUT
200mV/DIV
I
LOAD
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 80mA ~ 800mA
10μs/DIV
34074 G03
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3407EMSE-4#PBF

Mfr. #:
Buy LTC3407EMSE-4#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual, Sync. 800mA, 2.25MHz Step-dwn Convrtr in MS10E
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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