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LTC3416EFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3416
1
3416fa
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. OPTI-LOOP is a registered trade-
mark of Linear Technology Corporation. Protected by U.S. Patents including 5481178,
6580258, 6304066, 6127815, 6498466, 6611131, 6724174.
■
High Efficiency: Up to 95%
■
4A Output Current
■
Low R
DS(ON)
Internal Switch: 67mΩ
■
Tracking Input to Provide Easy Supply Sequencing
■
Programmable Frequency: 300kHz to 4MHz
■
2.25V to 5.5V Input Voltage Range
■
±2% Output Voltage Accuracy
■
0.8V Reference Allows Low Output Voltage
■
Low Dropout Operation: 100% Duty Cycle
■
Power Good Output Voltage Monitor
■
Overtemperature Protected
■
Available in a 20-Lead Thermally Enhanced
TSSOP Package
4A, 4MHz, Monolithic
Synchronous Step-Down
Regulator with Tracking
■
Portable Instruments
■
Notebook Computers
■
Distributed Power Systems
■
Battery-Powered Equipment
■
POL Board Power
SVIN
PGOOD
22µF
V
OUT2
2.5V
100µF
×2
V
OUT1
1.8V
4A
0.2µH
SW
LTC3416
PGND
SGND
R
T
RUN/SS
I
TH
TRACK
PVIN
V
FB
127k
7.5k
200k
255k
200k
255k
3416 F01a
820pF
V
IN
2.5V TO 5.5V
I/O VOLTAGE
Figure 1a. 2.5V/4A Step-Down Regulator with Tracking
The LTC
®
3416 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 delivering
up to 4A of output current. The internal synchronous
power switch with 67mΩ of on-resistance increases effi-
ciency and eliminates the need for an external Schottky
diode. Switching frequency is set by an external resistor.
100% duty cycle provides low dropout operation extend-
ing battery life in portable systems. OPTI-LOOP
®
compen-
sation allows the transient response to be optimized over
a wide range of loads and output capacitors.
The LTC3416 operates in forced continuous operation and
provides tracking of another power supply rail. Forced
continuous operation reduces noise and RF interference and
provides excellent transient response. Fault protection is
provided by an overcurrent comparator, and adjustable
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
Figure 1b. Efficiency vs Load Current
LOAD CURRENT (A)
0.01
40
EFFICIENCY (%)
50
60
70
80
0.10 1 10
3416 G09
30
20
10
0
90
100
V
IN
= 2.5V
V
OUT
= 1.8V
f = 2MHz
V
IN
= 3.3V
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
LTC3416
2
3416fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range 2.25 5.5 V
V
FB
Regulated Feedback Voltage (Note 3) ● 0.784 0.800 0.816 V
I
FB
Feedback Input Current 0.2 µA
I
TRACK
TRACK Input Current 0.2 µA
∆V
FB
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 3) 0.04 0.2 %/V
V
TRACK
Tracking Voltage Offset V
TRACK
= 0.4V 30 mV
Tracking Voltage Range 0 0.8 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 %
∆V
PGOOD
Power Good Range ±7.5 ±9%
R
PGOOD
Power Good Resistance 120 200 Ω
I
Q
Input DC Bias Current (Note 4)
Active Current V
FB
= 0.7V, V
ITH
= 1.2V 300 350 µA
Shutdown V
RUN
= 0V 0.02 1 µA
f
OSC
Switching Frequency R
OSC
= 294kΩ 0.88 1 1.12 MHz
Switching Frequency Range (Note 4) 0.30 4.00 MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 300mA 67 100 mΩ
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –300mA 50 100 mΩ
I
LIMIT
Peak Current Limit 68 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
Input Supply Voltage .................................. –0.3V to 6V
I
TH
, RUN, V
FB
Voltages .............................. – 0.3V to V
IN
TRACK Voltage .......................................... – 0.3V to V
IN
SW Voltage .................................. –0.3V to (V
IN
+ 0.3V)
Operating Ambient Temperature Range
(Note 2) .................................................. – 40°C to 85°C
Junction Temperature (Notes 5, 6) ...................... 125°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
(Note 1)
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3416EFE
T
JMAX
= 125°C, θ
JA
= 38°C/W, θ
JC
= 10°C/W
EXPOSED PAD IS GND (PIN 21)
MUST BE SOLDERED TO PCB
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 noted.
ELECTRICAL CHARACTERISTICS
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
PGND
R
T
TRACK
RUN/SS
SGND
NC
PV
IN
SW
SW
PGND
PGND
V
FB
I
TH
PGOOD
SV
IN
NC
PV
IN
SW
SW
PGND
21
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/
LTC3416
3
3416fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired. The voltage should never exceed 6.0V for any
pin.
Note 2: The LTC3416E 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.
Note 3: The LTC3416 is tested in a feedback loop that adjusts V
FB
to
achieve a specified error amplifier output voltage (I
TH
).
Note 4: This parameter is guaranteed by design and characterization.
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switch On-Resistance
vs Input Voltage
TEMPERATURE (°C)
–40
0.795
V
REF
(V)
0.796
0.798
0.799
0.800
0
40
60 140
3416 G01
0.797
–20 20
80
100
120
INPUT VOLTAGE (V)
2.25 2.75 3.25 3.75 4.25 4.75 5.25 5.75
ON-RESISTANCE (mΩ)
90
80
70
60
50
40
30
20
10
0
3416 G02
PFET
NFET
T
A
= 25°C
TEMPERATURE (°C)
–40
ON-RESISTANCE (mΩ)
120
100
80
60
40
20
0
–25
3416 G03
–10
520
35
50
65 80 95
110
125
PFET
NFET
V
REF
vs Temperature, V
IN
= 3.3V
Switch On-Resistance
vs Temperature, V
IN
= 3.3V
Switch Leakage vs Input Voltage
INPUT VOLTAGE (V)
2.25
SWITCH LEAKAGE CURRENT (nA)
20
18
16
14
12
10
8
6
4
2
0
3.25 4.25 4.75
3416 G04
2.75 3.75 5.25
PFET
NFET
T
A
= 25°C
Frequency vs R
OSC
R
OSC
(k)
25
FREQUENCY (kHz)
7000
6000
5000
4000
3000
2000
1000
0
3416 G05
225 925825725625525125 325 425
V
IN
= 3.3V
T
A
= 25°C
Frequency vs Input Voltage
INPUT VOLTAGE (V)
2.25 3.25 4.25 4.752.75 3.75 5.25
1040
1020
1000
980
960
940
920
900
3416 G06
FREQUENCY (kHz)
R
OSC
= 294k
T
A
= 25°C
Note 5: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 6: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
as follows:
LTC3416E: T
J
= T
A
+ (P
D
)(38°C/W)
Note 7: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
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LTC3416EFE#PBF

Mfr. #:
Buy LTC3416EFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 4A, 4MHz, Mono Sync Buck Reg w/ Track
Lifecycle:
New from this manufacturer.
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