LTC3407EDD-2 Linear Technology, LTC3407EDD-2 Datasheet

IC REG DC/DC DUAL STEPDOWN 10DFN

LTC3407EDD-2

Manufacturer Part Number
LTC3407EDD-2
Description
IC REG DC/DC DUAL STEPDOWN 10DFN
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC3407EDD-2

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
2
Voltage - Output
0.6 ~ 5 V
Current - Output
1A
Frequency - Switching
1.5MHz
Voltage - Input
2.5 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-DFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3407EDD-2
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC3407EDD-2
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC3407EDD-2 2.5V
Manufacturer:
LINEAR
Quantity:
1 171
Part Number:
LTC3407EDD-2#PBF
Manufacturer:
LT/凌特
Quantity:
20 000
Part Number:
LTC3407EDD-2#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIONS
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TYPICAL APPLICATION
V
OUT2
AT 800mA
High Effi ciency: Up to 95%
Very Low Quiescent Current: Only 40μA
2.25MHz Constant-Frequency Operation
High Switch Current: 1.2A on Each Channel
No Schottky Diodes Required
Low R
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I
Output Voltages from 5V down to 0.6V
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced MSOP and 3mm × 3mm
DFN Packages
PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems
= 2.5V
10μF
C3
V
IN
Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators
TO 5.5V
= 2.5V*
DS(ON)
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
C5, 22pF
887k
R4
Internal Switches: 0.35Ω
C1
10μF
2.2μH
L2
R3
280k
*V
OUT
CONNECTED TO V
MODE/SYNC
SW2
V
RUN2
FB2
LTC3407-2
GND
V
IN
Q
IN
RUN1
FOR V
< 1μA
SW1
POR
V
L1, L2: MURATA LQH32CN2R2M33
FB1
IN
301k
2.8V
2.2μH
R1
L1
R5
100k
C4, 22pF
RESET
604k
R2
C2
10μF
V
AT 800mA
OUT1
= 1.8V
3407 TA01
Dual Synchronous, 800mA,
DESCRIPTION
The LTC
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 inductors
with a profi le ≤1.2mm. Each output voltage is adjustable
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
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.
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.
®
operation provides high effi ciency at light loads,
®
3407-2 is a dual, constant-frequency, synchro-
2.25MHz Step-Down
100
95
90
85
80
75
70
65
60
1
LTC3407-2 Effi ciency Curve
V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
IN
DC/DC Regulator
= 3.3V
LOAD CURRENT (mA)
10
100
1.8V
LTC3407-2
2.5V
3407 TA02
1000
34072fc
1

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LTC3407EDD-2 Summary of contents

Page 1

... In shutdown, the device draws <1μA. 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. ...

Page 2

... LTC3407IDD-2#TRPBF LTC3407EMSE-2#PBF LTC3407EMSE-2#TRPBF LTC3407IMSE-2#PBF LTC3407IMSE-2#TRPBF LEAD BASED FINISH TAPE AND REEL LTC3407EDD-2 LTC3407EDD-2#TR LTC3407IDD-2 LTC3407IDD-2#TR LTC3407EMSE-2 LTC3407EMSE-2#TR LTC3407IMSE-2 LTC3407IMSE-2#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V Feedback Voltage (Note 3) FB ΔV Reference Voltage Line Regulation LINE REG ΔV Output Voltage Load Regulation LOAD REG I Input DC Supply Current S Active Mode ...

Page 4

LTC3407-2 TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Input Voltage 100 95 100mA 90 10mA 1mA 85 800mA 1.8V OUT 65 Burst Mode OPERATION CIRCUIT OF FIGURE INPUT VOLTAGE (V) ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load Current 100 95 3. 1.2V OUT Burst Mode OPERATION 65 NO LOAD ON OTHER CHANNEL CIRCUIT OF FIGURE 100 1000 ...

Page 6

LTC3407-2 BLOCK DIAGRAM REGULATOR 1 MODE/SYNC 6 + 0.6V EA – FB1 0.55V 0.65V SHUTDOWN RUN1 2 0.6V REF OSC 9 RUN2 REGULATOR 2 (IDENTICAL TO REGULATOR FB2 OPERATION The LTC3407-2 uses a constant-frequency, current ...

Page 7

OPERATION Low Current Operation Two modes are available to control the operation of the LTC3407-2 at low currents. Both modes automatically switch from continuous operation to the selected mode when the load current is low. To optimize effi ciency, the ...

Page 8

LTC3407-2 APPLICATIONS INFORMATION range of low current operation. In Burst Mode operation, lower inductance values will cause the burst frequency to increase. Inductor Core Selection Different core materials and shapes will change the size/ current and price/current relationship of an ...

Page 9

APPLICATIONS INFORMATION fer very low ESR, but have a lower capacitance density than other types. Tantalum capacitors have the highest capacitance density, but they have a larger ESR and it is critical that the capacitors are surge tested for use ...

Page 10

... Percent effi ciency can be expressed as: %Effi ciency = 100 ...) where L1, L2, etc. are the individual losses as a percent- age of input power. Hot Swap is a trademark of Linear Technology Corporation regulator OUT 34072fc ...

Page 11

APPLICATIONS INFORMATION Although all dissipative elements in the circuit produce losses, four main sources usually account for most of the losses in LTC3407-2 circuits switching losses losses, 4) other losses. 1. The V ...

Page 12

LTC3407-2 APPLICATIONS INFORMATION Design Example As a design example, consider using the LTC3407 portable application with a Li-Ion battery. The battery provides 2.8V to 4.2V. The load requires a maximum IN of 800mA in active ...

Page 13

TYPICAL APPLICATIONS 1.8V OUT2 AT 800mA C1, C2, C3: TAIYO YUDEN JMK316BJ106ML Low Ripple Buck Regulators Using Ceramic Capacitors RUN2 V RUN1 IN POR LTC3407-2 L2 ...

Page 14

LTC3407-2 TYPICAL APPLICATIONS 1.2mm Height Core Supply 5.5V C1* 4.7μF RUN2 MODE/SYNC LTC3407-2 L2 2.2μ 3.3V OUT2 SW2 AT 800mA C5, 22pF V FB2 887k 4.7μF 196k 2 C1, C2, ...

Page 15

... LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... Synchronous Step Down DC/DC Converter OUT LTC3414 4MHz, Synchronous Step Down DC/DC Converter OUT LTC3440 600mA (I ), 2MHz, Synchronous Buck-Boost DC/DC OUT Converter ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● RUN2 V RUN1 10μ ...

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