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LTC3814IFE-5#PBF

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LTC3814-5
1
38145fc
60V Current Mode
Synchronous Step-Up Controller
The LTC3814-5 is a synchronous step-up switching regu-
lator controller that can generate output voltages up to
60V. The LTC3814-5 uses a constant off-time peak current
control architecture to deliver very high duty cycles with
accurate cycle-by-cycle current limit without requiring a
sense resistor.
A precise internal reference provides ±0.5% DC accuracy.
A high bandwidth (25MHz) error amplifi er provides very
fast line and load transient response. Large 1Ω gate driv-
ers allow the LTC3814-5 to drive large power MOSFETs
for higher current applications. The operating frequency
is selected by an external resistor and is compensated for
variations in V
IN
. A shutdown pin allows the LTC3814-5
to be turned off reducing the supply current to <230µA.
n
24V Fan Supplies
n
48V Telecom and Base Station Power Supplies
n
Networking Equipment, Servers
n
Automotive and Industrial Control Systems
n
High Output Voltages: Up to 60V
n
Large 1Ω Gate Drivers
n
No Current Sense Resistor Required
n
Dual N-Channel MOSFET Synchronous Drive
n
±0.5% 0.8V Voltage Reference
n
Fast Transient Response
n
Programmable Soft-Start
n
Generates 5.5V Driver Supply
n
Power Good Output Voltage Monitor
n
Adjustable Off-Time/Frequency: t
OFF(MIN)
< 100ns
n
Adjustable Cycle-by-Cycle Current Limit
n
Undervoltage Lockout On Driver Supply
n
Output Overvoltage Protection
n
Thermally Enhanced 16-Pin TSSOP Package
High Effi ciency High Voltage Step-Up Converter
Effi ciency vs Load Current
FEATURES DESCRIPTION
APPLICATIONS
TYPICAL APPLICATION
PGOOD
V
OFF
PGOOD
V
RNG
I
TH
V
FB
SGND
RUN/SS
I
OFF
1000pF
0.01µF
100pF
V
IN
4.5V TO 14V
22µF
V
OUT
24V
4A
V
OUT
100k
100k
263k
LTC3814-5
EXTV
CC
TG
SW
BG
PGND
INTV
CC
NDRV
BOOST
38145 TA01
0.1µF
M1
Si7848DP
M2
Si7848DP
1µF
29.4k
1k
270µF
× 2
4.7µH
+
+
D1
MBR1100
LOAD (A)
0
EFFICIENCY (%)
90
95
4
85
80
1
2
3
100
38145 TA01b
V
IN
= 12V
V
IN
= 5V
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No R
SENSE
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5481178, 5847554, 6304066, 6476589,
6580258, 6677210, 6774611.
LTC3814-5
2
38145fc
Supply Voltages
INTV
CC
................................................... –0.3V to 14V
(INTV
CC
– PGND), (BOOST – SW) ......... –0.3V to 14V
BOOST (Continuous) ............................. –0.3V to 85V
BOOST (≤400ms) .................................. –0.3V to 95V
EXTV
CC
.................................................. –0.3V to 15V
(EXTV
CC
– INTV
CC
) .................................. –12V to 12V
(NDRV – INTV
CC
) Voltage ........................... –0.3V to 10V
SW Voltage (Continuous) .............................. –1V to 70V
SW Voltage (400ms) ..................................... –1V to 80V
I
OFF
Voltage (Continuous) .......................... –0.3V to 70V
I
OFF
Voltage (400ms) ................................. –0.3V to 80V
RUN/SS Voltage ........................................... –0.3V to 5V
PGOOD Voltage ............................................ –0.3V to 7V
V
RNG
, V
OFF
Voltages ................................... –0.3V to 14V
FB Voltage ................................................. –0.3V to 2.7V
TG, BG, INTV
CC
, EXTV
CC
RMS Currents .................50mA
Operating Junction Temperature Range
(Notes 2, 3, 7) ....................................... –40°C to 125°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
I
OFF
V
OFF
V
RNG
PGOOD
I
TH
V
FB
RUN/SS
SGND
BOOST
TG
SW
PGND
BG
INTV
CC
EXTV
CC
NDRV
17
T
JMAX
= 125°C, θ
JA
= 38°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3814EFE-5#PBF LTC3814EFE-5#TRPBF 3814EFE-5 16-Lead Plastic TSSOP –40°C to 125°C
LTC3814IFE-5#PBF LTC3814IFE-5#TRPBF 3814IFE-5 16-Lead Plastic TSSOP –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
ORDER INFORMATION
LTC3814-5
3
38145fc
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
INTV
CC
INTV
CC
Supply Voltage
l
4.35 14 V
I
Q
INTV
CC
Supply Current
INTV
CC
Shutdown Current
RUN/SS > 1.5V (Notes 4, 5)
RUN/SS = 0V
3
224
6
600
mA
µA
I
BOOST
BOOST Supply Current RUN/SS > 1.5V (Note 5)
RUN/SS = 0V
240
0
400
5
µA
µA
V
FB
Feedback Voltage (Note 4)
0°C to 85°C
–40°C to 85°C
–40°C to 125°C
l
l
l
0.796
0.794
0.792
0.792
0.800
0.800
0.800
0.800
0.804
0.806
0.806
0.808
V
V
V
V
∆V
FB,LINE
Feedback Voltage Line Regulation 5V < INTV
CC
< 14V (Note 4)
l
0.002 0.02 %/V
V
SENSE(MAX)
Maximum Current Sense Threshold V
RNG
= 2V, V
FB
= 0.76V
V
RNG
= 0V, V
FB
= 0.76V
V
RNG
= INTV
CC
, V
FB
= 0.76V
256
70
170
320
95
215
384
120
260
mV
mV
mV
V
SENSE(MIN)
Minimum Current Sense Threshold V
RNG
= 2V, V
FB
= 0.84V
V
RNG
= 0V, V
FB
= 0.84V
V
RNG
= INTV
CC
, V
FB
= 0.84V
–300
–85
–200
mV
mV
mV
I
VFB
Feedback Current V
FB
= 0.8V 20 150 nA
A
VOL
(EA) Error Amplifi er DC Open-Loop Gain 65 100 dB
f
U
Error Amp Unity Gain Crossover
Frequency
(Note 6) 25 MHz
V
RUN/SS
Shutdown Threshold 0.6 0.9 1.2 V
I
RUN/SS
RUN/SS Source Current RUN/SS
= 0V 0.7 1.4 2.5 µA
V
VCCUV
INTV
CC
Undervoltage Lockout INTV
CC
Rising
Hysteresis
l
4.05 4.2
0.5
4.35 V
V
Oscillator
t
OFF
Off-Time I
OFF
= 100µA
I
OFF
= 300µA
1.55
515
1.85
605
2.15
695
µs
ns
t
OFF(MIN)
Minimum Off-Time I
OFF
= 2000µA 100 ns
t
ON(MIN)
Minimum On-Time 350 ns
Driver
I
BG,PEAK
BG Driver Peak Source Current V
BG
= 0V 0.7 1 A
R
BG,SINK
BG Driver Pulldown R
DS(ON)
1 1.5
Ω
I
TG,PEAK
TG Driver Peak Source Current V
TG
–
V
SW
= 0V 0.7 1 A
R
TG,SINK
TG Driver Pulldown R
DS(ON)
1 1.5
Ω
PGOOD Output
∆V
FBOV
PGOOD Upper Threshold
PGOOD Lower Threshold
V
FB
Rising
V
FB
Falling
7.5
–7.5
10
–10
12.5
–12.5
%
%
∆V
FB,HYST
PGOOD Hysteresis V
FB
Returning 1.5 3 %
V
PGOOD
PGOOD Low Voltage I
PGOOD
= 5mA 0.3 0.6 V
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V 0 2 µA
The l denotes specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C (Note 2), INTV
CC
= V
BOOST
= V
RNG
= V
EXTVCC
= V
NDRV
= V
OFF
= 5V, unless
otherwise specifi ed.
ELECTRICAL CHARACTERISTICS
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LTC3814IFE-5#PBF

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Buy LTC3814IFE-5#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 60V C Mode Sync Boost Cntr
Lifecycle:
New from this manufacturer.
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