allows the transient response to be optimized over a wide
range of loads and output capacitors.
The LTC3412 can be configured for either Burst Mode
®
operation or forced continuous operation. Forced con-
tinuous operation reduces noise and RF interference
while Burst Mode operation provides high efficiency by
reducing gate charge losses at light loads. In Burst Mode
operation, external control of the burst clamp level allows
the output voltage ripple to be adjusted according to the
requirements of the application. To further maximize bat-
tery life, the P-channel MOSFET is turned on continuously
in dropout (100% duty cycle).
L,
LT, LTC, LTM, Burst Mode, OPTI-LOOP Linear Technology and the Linear logo are registered
,
trademarks and ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the
property of their respective owners.
■
■
■
■
■
High Efficiency: Up to 95%
2.5A Output Current
Low Quiescent Current: 62µA
Low R
DS(ON)
Internal Switches: 85mΩ
Programmable Frequency: 300kHz to 4MHz
No Schottky Diode Required
± 2% Output Voltage Accuracy
0.8V Reference Allows Low Output Voltage
Selectable Forced Continuous/Burst Mode Operation
with Adjustable Burst Clamp
Synchronizable Switching Frequency
Low Dropout Operation: 100% Duty Cycle
Power Good Output Voltage Monitor
Overtemperature Protection
Available in 16-Lead Thermally Enhanced TSSOP
and QFN Packages
APPLICATIONS
■
■
■
■
■
■
Portable Instruments
Battery-Powered Equipment
Notebook Computers
Distributed Power Systems
Cellular Telephones
Digital Cameras
TYPICAL APPLICATION
V
IN
2.7V TO 5.5V
SV
IN
R
T
4.7M
309k
LTC3412
RUN/SS
470pF
15k
1000pF
PGND
SGND
I
TH
SYNC/MODE V
FB
100pF
110k
75k
392k
3412 F01
Efficiency vs Load Current
PV
IN
PGOOD
SW
100µF
1µH
22µF
V
OUT
2.5V
2.5A
100
80
EFFICIENCY (%)
Burst Mode OPERATION
60
FORCED CONTINUOUS
40
20
V
IN
= 3.3V
V
OUT
= 2.5V
0.01
0.1
1
LOAD CURRENT (A)
10
3412 G01
0
0.001
Figure 1. 2.5V, 2.5A Step-Down Regulator
3412fc
For more information
www.linear.com/LTC3412
1
LTC3412
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage .................................... – 0.3V to 6V
I
TH
, RUN, V
FB
Voltages ............................... –0.3V to V
IN
SYNC/MODE Voltages................................. –0.3V to V
IN
SW Voltage ................................... –0.3V to (V
IN
+ 0.3V)
Peak SW Sink and Source Current ..........................6.5A
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature (Note 5) ............................. 125°C
Lead Temperature (Soldering, 10 sec) TSSOP ...... 300°C
PIN CONFIGURATION
SV
IN
PGOOD
I
TH
V
FB
R
T
SYNC/MODE
RUN/SS
SGND
1
2
3
4
5
6
7
8
17
16 PV
IN
15 SW
14 SW
13 PGND
12 PGND
11 SW
10 SW
9
PV
IN
RUN/SS 1
SGND 2
PV
IN
3
SW 4
5
SW
6
PGND
7
PGND
8
SW
17
SYNC/MODE
TOP VIEW
TOP VIEW
V
FB
16 15 14 13
12 PGOOD
11 SV
IN
10 PV
IN
9
SW
FE PACKAGE
16-LEAD PLASTIC TSSOP
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
T
JMAX
= 125°C,
θ
JA
= 37.6°C/W,
θ
JC
= 10°C/W
UF PACKAGE
16-LEAD (4mm
×
4mm) PLASTIC QFN
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
T
JMAX
= 125°C,
θ
JA
= 34°C/W,
θ
JC
= 1°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC3412EFE#PBF
LTC3412IFE#PBF
LTC3412EUF#PBF
LEAD BASED FINISH
LTC3412EFE
LTC3412IFE
LTC3412EUF
TAPE AND REEL
LTC3412EFE#TRPBF
LTC3412IFE#TRPBF
LTC3412EUF#TRPBF
TAPE AND REEL
LTC3412EFE#TR
LTC3412IFE#TR
LTC3412EUF#TR
http://www.linear.com/product/LTC3412#orderinfo
PART MARKING*
3412EFE
3412IFE
3412
PART MARKING*
3412EFE
3412IFE
3412
PACKAGE DESCRIPTION
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead (4mm
×
4mm) Plastic QFN
PACKAGE DESCRIPTION
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead (4mm
×
4mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
I
TH
R
T
2
3412fc
For more information
www.linear.com/LTC3412
LTC3412
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V unless otherwise specified.
SYMBOL PARAMETER
SV
IN
V
FB
I
FB
∆V
FB
Signal Input Voltage Range
Regulated Feedback Voltage
Voltage Feedback Leakage Current
Reference Voltage Line Regulation
V
IN
= 2.7V to 5.5V (Note 3)
Measured in Servo Loop, V
ITH
= 0.36V
Measured in Servo Loop, V
ITH
= 0.84V
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
(Note 3)
l
MIN
2.625
0.784
TYP
0.800
0.1
0.04
0.02
– 0.02
±7.5
120
MAX
5.5
0.816
0.4
0.2
0.2
–0.2
±9
200
330
80
1
1.1
4
4
110
90
2.625
1
0.8
1
UNITS
V
V
µA
%V
%
%
%
Ω
µA
µA
µA
MHz
MHz
MHz
mΩ
mΩ
A
V
µA
V
µA
V
LOADREG
Output Voltage Load Regulation
∆V
PGOOD
R
PGOOD
I
Q
Power Good Range
Power Good Pull-Down Resistance
Input DC Bias Current
Active Current
Sleep
Shutdown
Switching Frequency
Switching Frequency Range
SYNC Capture Range
R
DS(ON)
of P-Channel FET
R
DS(ON)
of N-Channel FET
Peak Current Limit
Undervoltage Lockout Threshold
SW Leakage Current
RUN Threshold
RUN/SS Leakage Current
(Note 4)
V
FB
= 0.78V, V
ITH
= 1V
V
FB
= 1V, V
ITH
= 0V
V
RUN
= 0V, V
MODE
= 0V
R
OSC
= 309kΩ
(Note 6)
(Note 6)
I
SW
= 1A (Note 7)
I
SW
= –1A (Note 7)
4
2.375
V
RUN
= 0V, V
IN
= 5.5V
0.5
0.88
0.3
0.3
250
62
0.02
0.95
f
OSC
f
SYNC
R
PFET
R
NFET
I
LIMIT
V
UVLO
I
LSW
V
RUN
I
RUN
85
65
5.4
2.500
0.1
0.65
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 LTC3412E 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. The LTC3412I is guaranteed to meet
specified performance over the –40°C to 85°C temperature range.
Note 3:
The LTC3412 is tested in a feedback loop that adjusts V
FB
to
achieve a specified error amplifier output voltage (I
TH
).
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 temperature T
A
and power
dissipation as follows: LTC3412: T
J
= T
A
+ P
D
(37.6°C/W).
Note 6:
4MHz operation is guaranteed by design and not production tested.
Note 7:
Switch on resistance is guaranteed by design and test correlation
in the UF package and by production test in the FE package.
In response to customer needs, we have changed from working on embedded systems to working on mechanics. Electronic engineers must also develop in an all-round way. The picture above shows the work, h...
I am debugging the Audio Driver under Windows Mobile and found that: In some cases, after the system wakes up, it can receive PowerUp but not D0. I wonder if anyone has encountered this situation befo...
USB audio solution, USB sound card solution1. Product description
ATE1133 is a chip that includes an audio codec, a HIFI-level single microphone input, and a stereo headphone output solution. It integ...
Recently I wrote an application under EVC (MFC uses shared mfc dll) and then added the application to the image file according to the method on the Internet: the method is described in detail as follo...
When creating a new project in Quartus, I filled in an entity name, but there are multiple files under this project. The entity name of each file is different, and it is also different from the entity...
Emulator x86 Win32[WCE emulator] Debug測試作業系統鏡像錯誤..
訊息如下:
One or more files from the Emulator for Windows CE installation is missing.
Please reinstall Emulator for Windows CE and try again...
Nios II is a configurable 16-/32-bit RISC processor. Combined with a rich set of peripheral-specific instructions and hardware acceleration units, it provides a highly flexible and powerful SOPC sy...[Details]
What is "Car Electronic Fence"
Fleet managers can define a graphical area (regular or irregular) or divide it into administrative zones in Yamei Technology's vehicle backend management system ...[Details]
"Have you set your calendar reminder?"
On August 24, Nvidia Robotics' official account posted a photo of a black gift box on a social media platform, with an attached greeting card sig...[Details]
Recently, Tesla released the "Tesla Car Voice Assistant Terms of Use", announcing that the car voice assistant will be connected to the Doubao large model (Skylark large model) and DeepSeek Chat pr...[Details]
Spark plugs are an indispensable device for engines. As the saying goes, without spark plugs, the engine cannot work properly. The serious consequence is that when driving at high speeds, the engin...[Details]
Permanent magnets are essential components in a wide range of household and industrial devices. They are particularly crucial in the renewable energy sector, including electric vehicle motors. Curr...[Details]
With the increasing number of new energy vehicles on the road, the deployment of supporting facilities for these vehicles has accelerated, and new energy vehicles have gradually entered the vision ...[Details]
Before understanding single-phase control transformers, let's briefly understand what a single-phase transformer is. A single-phase transformer uses a single-phase input. Compared to a three-phase ...[Details]
The second-generation Snapdragon W5+ and second-generation Snapdragon W5 platforms support users sending and receiving messages via satellite when there is no cellular and Wi-Fi coverage.
...[Details]
introduction
As core electronic components used in vastly different fields, automotive-grade chips and mobile/consumer-grade chips exhibit significant differences in their...[Details]
Reasons for the wear of the roller press reducer shaft:
1. Since the expansion sleeve is subjected to a large torque, the mating surfaces of the shaft and the sleeve move relative to each other...[Details]
As my country's industrialization continues to improve, environmental pollution is also facing tremendous pressure. In recent years, national environmental protection policies have become increasin...[Details]
Naxin Micro releases the NS800RT737x high-performance real-time control MCU (DSP), enabling core control in the industrial and energy sectors.
In power electronics and electric drive...[Details]
On August 19, Reuters reported that people familiar with the matter said that Nvidia is developing a new AI chip based on its latest Blackwell architecture for the Chinese market. The performance o...[Details]
Mathematical functions are very important and are used in many situations such as analog quantity processing and PID control.
(12) Calculate sine value instruction (SIN)
The "Calculate Si...[Details]
DIY/Open Source Hardware
京公网安备 11010802033920号
EEWORLD
