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LTC3412AMPFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC3412A
1
3412afe
ApplicAtions
n
Point-of-Load Regulation
n
Notebook Computers
n
Portable Instruments
n
Distributed Power Systems
n
High Efficiency: Up to 95%
n
3A Output Current
n
Low Quiescent Current: 64µA
n
Low R
DS(ON)
Internal Switch: 77mΩ
n
2.25V to 5.5V Input Voltage Range
n
Programmable Frequency: 300kHz to 4MHz
n
±2% Output Voltage Accuracy
n
0.8V Reference Allows Low Output Voltage
n
Selectable Forced Continuous/Burst Mode
®
Operation
with Adjustable Burst Clamp
n
Synchronizable Switching Frequency
n
Low Dropout Operation: 100% Duty Cycle
n
Power Good Output Voltage Monitor
n
Overtemperature Protected
n
Available in 16-Lead Exposed Pad TSSOP and
QFN Packages
typicAl ApplicAtion
Description
3A, 4MHz, Monolithic
Synchronous
Step-Down Regulator
The LTC
®
3412A 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 2.25V to 5.5V and provides a
regulated output voltage from 0.8V to 5V while deliver-
ing up to 3A of output current. The internal synchronous
power switch with 77mΩ on-resistance increases efficiency
and eliminates the need for an external Schottky diode.
Switching frequency is set by an external resistor or can
be synchronized 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 optimized over a wide range of
loads and output capacitors.
The LTC3412A can be configured for either Burst Mode
operation or forced continuous operation. Forced continu-
ous 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 application
requirements.
FeAtures
Efficiency and Power Loss
Figure 1. 2.5V/3A Step-Down Regulator
3412A F01a
SYNC/MODE V
FB
PGOOD
SW
PGND
SGND
RT
RUN/SS
I
TH
SV
IN
PV
IN
LTC3412A
294k
22µF
C
OUT
100µF
×2
0.47µH
V
OUT
2.5V AT 3A
V
IN
3.3V
1000pF
2.2M
820pF
12.1k
115k
69.8k 392k
LOAD CURRENT (A)
0.01
EFFICIENCY (%)
POWER LOSS (mW)
100
95
90
85
80
75
70
65
60
55
50
100000
10000
1000
100
10
1
0.1 1 10
3412A F01b
EFFICIENCY
POWER LOSS
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered
trademarks and ThinSOT is a trademark 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, 6724174.
LTC3412A
2
3412afe
Absolute MAxiMuM rAtings
Input Supply Voltage .................................... –0.3V to 6V
I
TH
, RUN/SS, V
FB
, PGOOD,
SYNC/MODE Voltages ....................................–0.3 to V
IN
SW Voltages ..................................–0.3V to (V
IN
+ 0.3V)
(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
T
JMAX
= 125°C, θ
JA
= 38°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
16 15 14 13
5 6 7 8
TOP VIEW
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
17
T
JMAX
= 125°C, θ
JA
= 37°C/W, θ
JC
= 5°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE CONNECTED TO PCB
pin conFigurAtion
orDer inForMAtion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3412AEFE#PBF LTC3412AEFE#TRPBF 3412AEFE 16-Lead Plastic TSSOP –40°C to 125°C
LTC3412AIFE#PBF LTC3412AIFE#TRPBF 3412AIFE 16-Lead Plastic TSSOP –40°C to 125°C
LTC3412AEUF#PBF LTC3412AEUF#TRPBF 3412A
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3412AIUF#PBF LTC3412AIUF#TRPBF 3412A
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3412AEFE LTC3412AEFE#TR 3412AEFE 16-Lead Plastic TSSOP –40°C to 125°C
LTC3412AIFE LTC3412AIFE#TR 3412AIFE 16-Lead Plastic TSSOP –40°C to 125°C
LTC3412AMPFE LTC3412AMPFE#TR 3412AMPFE 16-Lead Plastic TSSOP –55°C to 125°C
LTC3412AEUF LTC3412AEUF#TR 3412A
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3412AIUF LTC3412AIUF#TR 3412A
16-Lead (4mm × 4mm) Plastic QFN
–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/
Operating Junction Temperature Range (Notes 2, 5)
E-, I-Grades .......................................– 40°C to 125°C
MP-Grade ..........................................–55°C to 125°C
Junction Temperature (Note 5) ............................. 125°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
LTC3412A
3
3412afe
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 LTC3412AE is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3412AI is guaranteed
to meet performance specifications over the –40°C to 125°C operating
junction temperature range. The LTC3412AMP is guaranteed and tested to
meet performance specifications over the full –55°C to 125°C operating
junction temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
resistance and other environmental factors.
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
≈ T
J
= 25°C. V
IN
= 3.3V unless otherwise specified.
Note 3: The LTC3412A 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: LTC3412AFE: T
J
= T
A
+ P
D
(38°C/W)
LTC3412AUF: T
J
= T
A
+ P
D
(34°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 condition in
the UF package and by final test correlation in the FE package.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SV
IN
Signal Input Voltage Range 2.25 5.5 V
V
FB
Regulated Feedback Voltage (Note 3)
E-, I-Grades
MP-Grade
l
l
0.784
0.780
0.800
0.800
0.816
0.816
V
V
I
FB
Voltage Feedback Leakage Current 0.1 0.2 µA
∆V
FB
Reference Voltage Line Regulation V
IN
= 2.7V to 5.5V (Note 3)
l
0.04 0.2 %V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop, V
ITH
= 0.36V
Measured in Servo Loop, V
ITH
= 0.84V
l
l
0.02
–0.02
0.2
–0.2
%
%
∆V
PGOOD
Power Good Range ±7.5 ±9 %
R
PGOOD
Power Good Pull-Down Resistance 120 200 Ω
I
Q
Input DC Bias Current
Active Current
Sleep
Shutdown
(Note 4)
V
FB
= 0.78V, V
ITH
= 1V
V
FB
= 1V, V
ITH
= 0V
V
RUN
= 0V, V
MODE
= 0V
250
64
0.02
330
80
1
µA
µA
µA
f
OSC
Switching Frequency
Switching Frequency Range
R
OSC
= 294kΩ
(Note 6)
0.88
0.3
1 1.1
4
MHz
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) 77 110 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 6 A
V
UVLO
Undervoltage Lockout Threshold 1.75 2 2.25 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
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LTC3412AMPFE#PBF

Mfr. #:
Buy LTC3412AMPFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators High Reliability Temp Range 3A, 4MHz, Monolithic Synchronous Step-Down Regulator in TSSOP-16E
Lifecycle:
New from this manufacturer.
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