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LTC3412EFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC3412
1
3412fb
The LTC
®
3412 is a high efficiency monolithic synchro-
nous, step-down DC/DC converter utilizing a constant
frequency, current mode architecture. It operates from an
input voltage range of 2.625V to 5.5V and provides an
adjustable regulated output voltage from 0.8V to 5V while
delivering up to 2.5A of output current. The internal
synchronous power switch with 85mΩ on-resistance
increases efficiency and eliminates the need for an exter-
nal Schottky diode. Switching frequency is set by an
external resistor or can be sychronized to an external
clock. 100% duty cycle provides low dropout operation
extending battery life in portable systems. OPTI-LOOP
®
compensation allows the transient response to be opti-
mized 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 reduc-
ing 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
battery life, the P-channel MOSFET is turned on continu-
ously in dropout (100% duty cycle).
■
Portable Instruments
■
Battery-Powered Equipment
■
Notebook Computers
■
Distributed Power Systems
■
Cellular Telephones
■
Digital Cameras
■
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
2.5A, 4MHz, Monolithic
Synchronous Step-Down Regulator
Figure 1. 2.5V, 2.5A Step-Down Regulator
Efficiency vs Load Current
SV
IN
PV
IN
PGOOD
SW
LTC3412
PGND
SGND
RUN/SS
309k
V
IN
2.7V TO 5.5V
1000pF
R
T
I
TH
V
FB
SYNC/MODE
1μH
4.7M
470pF
75k
100pF
100μF
V
OUT
2.5V
2.5A
15k
110k
392k
22μF
3412 F01
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
100
80
60
40
20
0
10
3412 G01
V
IN
= 3.3V
V
OUT
= 2.5V
Burst Mode OPERATION
FORCED CONTINUOUS
0.1 10.01
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LTC3412
2
3412fb
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
ORDER PART NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3412EFE
LTC3412IFE
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
1
2
3
4
5
6
7
8
TOP VIEW
FE PACKAGE
16-LEAD PLASTIC TSSOP
16
15
14
13
12
11
10
9
SV
IN
PGOOD
I
TH
V
FB
R
T
SYNC/MODE
RUN/SS
SGND
PV
IN
SW
SW
PGND
PGND
SW
SW
PV
IN
17
FE PART MARKING
3412EFE
3412IFE
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
Operating Temperature
Range (Note 2) ....................................... – 40°C to 85°C
Junction Temperature (Note 5)............................. 125°C
Lead Temperature (Soldering, 10 sec)
TSSOP .............................................................. 300°C
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
ORDER PART NUMBER
LTC3412EUF
UF PART MARKING
3412
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
16 15 14 13
5 6 7 8
TOP VIEW
17
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
9
10
11
12
4
3
2
1RUN/SS
SGND
PV
IN
SW
PGOOD
SV
IN
PV
IN
SW
SYNC/MODE
R
T
V
FB
I
TH
SW
PGND
PGND
SW
ELECTRICAL CHARACTERISTICS
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 CONDITIONS MIN TYP MAX UNITS
SV
IN
Signal Input Voltage Range 2.625 5.5 V
V
FB
Regulated Feedback Voltage (Note 3) ● 0.784 0.800 0.816 V
I
FB
Voltage Feedback Leakage Current 0.1 0.4 μA
ΔV
FB
Reference Voltage Line Regulation V
IN
= 2.7V to 5.5V (Note 3) ● 0.04 0.2 %/V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop, V
ITH
= 0.36V ● 0.02 0.2 %
Measured in Servo Loop, V
ITH
= 0.84V ● – 0.02 –0.2 %
ΔV
PGOOD
Power Good Range ±7.5 ±9%
R
PGOOD
Power Good Pull-Down Resistance 120 200 Ω
I
Q
Input DC Bias Current (Note 4)
Active Current V
FB
= 0.78V, V
ITH
= 1V 250 330 μA
Sleep V
FB
= 1V, V
ITH
= 0V 62 80 μA
Shutdown V
RUN
= 0V, V
MODE
= 0V 0.02 1 μA
LTC3412
3
3412fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Efficiency vs Load CurrentEfficiency vs Load Current Efficiency vs Load Current
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
100
80
60
40
20
0
10
3412 G01
V
IN
= 3.3V
V
OUT
= 2.5V
Burst Mode OPERATION
FORCED CONTINUOUS
0.1 10.01
100
90
80
70
60
50
40
30
20
10
0
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
10
3412 G02
V
OUT
= 2.5V
1MHz
Burst Mode OPERATION
0.1 10.01
V
IN
= 3.3V V
IN
= 5V
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
10
3412 G03
V
OUT
= 2.5V
1MHz
FORCED CONTINUOUS
0.1 10.01
V
IN
= 3.3V V
IN
= 5V
ELECTRICAL CHARACTERISTICS
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 CONDITIONS MIN TYP MAX UNITS
f
OSC
Switching Frequency R
OSC
= 309kΩ 0.88 0.95 1.1 MHz
Switching Frequency Range (Note 6) 0.3 4 MHz
f
SYNC
SYNC Capture Range (Note 6) 0.3 4 MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 1A (Note 7) 85 110 mΩ
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –1A (Note 7) 65 90 mΩ
I
LIMIT
Peak Current Limit 4 5.4 A
V
UVLO
Undervoltage Lockout Threshold 2.375 2.500 2.625 V
I
LSW
SW Leakage Current V
RUN
= 0V, V
IN
= 5.5V 0.1 1 μA
V
RUN
RUN Threshold 0.5 0.65 0.8 V
I
RUN
RUN/SS Leakage Current 1 μA
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.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC3412EFE#TRPBF

Mfr. #:
Buy LTC3412EFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2.5A, 4MHz, Mono Sync Buck Reg
Lifecycle:
New from this manufacturer.
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