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LTC3407AEMSE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3407A
1
3407afa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Synchronous 600mA,
1.5MHz Step-Down
DC/DC Regulator
The LTC
®
3407A is a dual, constant frequency, synchronous
step-down DC/DC converter. Intended for low power ap-
plications, it operates from a 2.5V to 5.5V input voltage
range and has a constant 1.5MHz switching frequency,
enabling the use of tiny, low cost capacitors and inductors
1mm or less in height. Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35, 1A 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 ripple noise for low power effi ciency. Burst
Mode
®
operation provides the highest effi ciency at light
loads, while Pulse Skip Mode provides the lowest ripple
noise 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.
1mm High 2.5V/1.8V at 600mA Step-Down Regulators
n
High Effi ciency: Up to 96%
n
Low Ripple (35mV
P-P
) Burst Mode Operation;
I
Q
= 40μA
n
1.5MHz Constant Frequency Operation
n
No Schottky Diodes Required
n
Low R
DS(ON)
Internal Switches: 0.35
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
Optional External Soft-Start
n
Small Thermally Enhanced MSOP and 3mm × 3mm
DFN Packages
n
PDAs/Palmtop PCs
n
Digital Cameras
n
Cellular Phones
n
Wireless and DSL Modems
L, LT, LTC, LTM and Burst Mode 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.
LTC3407A Effi ciency/Power Loss Curve
RUN/SS2 V
IN
V
IN
= 2.5V
TO 5.5V
V
OUT2
= 2.5V
AT 600mA
V
OUT1
= 1.8V
AT 600mA
RUN/SS1
POR
SW1
V
FB1
GND
V
FB2
SW2
MODE/SYNC
LTC3407A
10µF
100k
RESET
22pF22pF
2.2µH2.2µH
887k 887k
442k280k
10µF
10µF
3407A TA01
LOAD CURRENT (mA)
1
0
EFFICIENCY (%)
POWER LOSS (W)
30
20
10
70
60
50
40
100
0.0001
0.001
0.1
0.01
1
90
80
10 100 1000
3407A TA02
2.5V
V
IN
= 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
1.8V
LTC3407A
2
3407afa
ABSOLUTE MAXIMUM RATINGS
V
IN
Voltage ...................................................–0.3V to 6V
V
FB1
, V
FB2
Voltages ................................... –0.3V to 1.5V
RUN/SS1, RUN/SS2 Voltages ......................–0.3V to V
IN
MODE/SYNC Voltage ....................................–0.3V to V
IN
SW1, SW2 Voltages ......................... –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
EXPOSED PAD IS PGND (PIN 11)
MUST BE CONNECTED TO GND
10
11
9
6
7
8
4
5
3
2
1
V
FB2
RUN/SS
2
POR
SW2
MODE/
SYNC
V
FB1
RUN/SS1
V
IN
SW1
GND
T
JMAX
= 125°C, θ
JA
= 45°C/W, θ
JC
= 10°C/W
TOP VIEW
1
2
3
4
5
V
FB1
RUN/SS1
V
IN
SW1
GND
10
9
8
7
6
V
FB2
RUN/SS2
POR
SW2
MODE/
SYNC
11
MSE PACKAGE
10-LEAD PLASTIC MSOP
EXPOSED PAD IS PGND (PIN 11)
MUST BE CONNECTED TO GND
T
JMAX
= 125°C, θ
JA
= 45°C/W, θ
JC
= 10°C/W
PIN CONFIGURATION
Operating Temperature Range (Note 2)
LTC3407AE .......................................... –40°C to 85°C
LTC3407AI ......................................... –40°C to 125°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range ...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
LTC3407AMSE Only .......................................... 300°C
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
≤ 125°C (LTC3407AI) ●
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
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3407AEDD#PBF LTC3407AEDD#TRPBF LCQN 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC3407AIDD#PBF LTC3407AIDD#TRPBF LCQN 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LTC3407AEMSE#PBF LTC3407AEMSE#TRPBF LTCRZ 10-Lead Plastic MSOP –40°C to 85°C
LTC3407AIMSE#PBF LTC3407AIMSE#TRPBF LTCRZ 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/
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
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)
LTC3407A
3
3407afa
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 LTC3407AE is guaranteed to meet specifi ed performance
from 0°C to 85°C. Specifi cations over the –40°C and 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3407AI is guaranteed over the full
–40°C to 125°C temperature range.
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)
Note 3: The LTC3407A 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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ΔV
LOAD REG
Output Voltage Load Regulation MODE/SYNC = 0V (Note 3) 0.5 %
I
S
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
(Note 4)
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
600
40
0.1
800
60
1
µA
µA
µA
f
OSC
Oscillator Frequency V
FBX
= 0.6V
●
1.2 1.5 1.8 MHz
f
SYNC
Synchronization Frequency 1.5 MHz
I
LIM
Peak Switch Current Limit V
IN
= 3V, V
FBX
= 0.5V, Duty Cycle <35% 0.75 1 1.25 A
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
(Note 6)
(Note 6)
0.35
0.30
0.45
0.45
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
Power-On Reset Delay 65,536 Cycles
V
RUN
RUN/SS Threshold Low
RUN/SS Threshold High
●
●
0.3 1 1.5
2
V
V
I
RUN
RUN/SS 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
Burst Mode Operation
Pulse Skipping Mode
3407 G01
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA
CIRCUIT OF FIGURE 3
SW
5V/DIV
V
OUT
50mV/DIV
I
L
200mA/DIV
2µs/DIV
3407 G02
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA
CIRCUIT OF FIGURE 3
SW
5V/DIV
V
OUT
10mV/DIV
I
L
100mA/DIV
1µs/DIV
TYPICAL PERFORMANCE CHARACTERISTICS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3407AEMSE#TRPBF

Mfr. #:
Buy LTC3407AEMSE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual. Sync. 600mA, 1.5MHz Step-dwn Convrtr
Lifecycle:
New from this manufacturer.
Delivery:
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