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LTC3812IFE-5#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
LTC3812-5
1
38125fc
60V Current Mode
Synchronous Switching
Regulator Controller
The LTC3812-5 is a synchronous step-down switching
regulator controller that can directly step down voltages
from up to 60V input, making it ideal for telecom and
automotive applications. The LTC3812-5 uses a constant
on-time valley current control architecture to deliver very
low 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 LTC3812-5 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 LTC3812-5 to
be turned off reducing the supply current to <230μA.
Integrated bias control generates gate drive power from
the input supply during start-up and when an output short-
circuit occurs, with the addition of a small external SOT23
MOSFET. When in regulation, power is derived from the
output for higher effi ciency.
n
48V Telecom and Base Station Power Supplies
n
Networking Equipment, Servers
n
Automotive and Industrial Control Systems
n
High Voltage Operation: Up to 60V
n
Large 1Ω Gate Drivers
n
No Current Sense Resistor Required
n
Dual N-Channel MOSFET Synchronous Drive
n
Extremely Fast Transient Response
n
±0.5% 0.8V Voltage Reference
n
Programmable Soft-Start
n
Generates 5.5V Driver Supply
n
Selectable Pulse-Skipping Mode Operation
n
Power Good Output Voltage Monitor
n
Adjustable On-Time/Frequency: t
ON(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-Down Converter
FEATURES DESCRIPTION
APPLICATIONS
TYPICAL APPLICATION
PGOOD
FCB
PGOOD
V
RNG
I
TH
V
FB
SGND
RUN/SS
I
ON
1000pF
47pF
5pF
V
IN
6V TO 60V
C
IN
22μF
V
OUT
5V
5A
M3
ZXMN-
10A07F
200k
100k
LTC3812-5
EXTV
CC
TG
SW
BG
PGND
INTV
CC
NDRV
BOOST
38125 TA01
0.1μF
R
ON
110k
100k
M1
Si7850DP
M2
Si7850DP
1μF
D1
MBR1100
10k
1.89k
C
OUT
270μF
L1
4.7
μH
+
+
Effi ciency vs Load Current
LOAD CURRENT (A)
0
80
EFFICIENCY (%)
85
90
95
100
1234
38125 TA01b
56
V
IN
= 12V
V
IN
= 42V
V
IN
= 24V
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks 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.
LTC3812-5
2
38125fc
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
ON
Voltage (Continuous) ........................... –0.3V to 70V
I
ON
Voltage (400ms) .................................. –0.3V to 80V
RUN/SS Voltage ........................................... –0.3V to 5V
PGOOD Voltage ............................................ –0.3V to 7V
V
RNG
, FCB 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
ON
V
RNG
PGOOD
FCB
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
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3812EFE-5#PBF LTC3812EFE-5#TRPBF 3812EFE-5 16-Lead Plastic TSSOP –40°C to 125°C
LTC3812IFE-5#PBF LTC3812IFE-5#TRPBF 3812IFE-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/
LTC3812-5
3
38125fc
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
FCB
FCB Threshold V
FCB
Rising 0.75 0.8 0.85 V
I
FCB
FCB Current FCB = 5V 0 1 μA
V
RUN/SS
Shutdown Threshold 1.2 1.5 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
Linear Regulator Mode
External Supply Mode
Trickle-Charge Mode
INTV
CC
Rising, I
NDRV
= 100μA
INTV
CC
Rising, NDRV
= INTV
CC
= EXTV
CC
INTV
CC
Rising, NDRV
= INTV
CC
, EXTV
CC
= 0
INTV
CC
Falling
l
l
l
4.05
4.05
8.70
4.2
4.2
9.0
3.7
4.35
4.35
9.30
V
V
V
V
Oscillator
t
ON
On-Time I
ON
= 100μA
I
ON
= 300μA
1.55
515
1.85
605
2.15
695
μs
ns
t
ON(MIN)
Minimum On-Time I
ON
= 2500μA 100 ns
t
OFF(MIN)
Minimum Off-Time 250 350 ns
Driver
I
BG,PEAK
BG Driver Peak Source Current V
BG
= 0V 0.7 1 A
R
BG,SINK
BG Driver Pull-Down 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 Pull-Down 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 Hysterisis V
FB
Returning 1.5 3 %
V
PGOOD
PGOOD Low Voltage I
PGOOD
= 5mA 0.3 0.6 V
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
= 5V, V
FCB
= V
SW
=
0V, unless otherwise specifi ed.
ELECTRICAL CHARACTERISTICS
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LTC3812IFE-5#TRPBF

Mfr. #:
Buy LTC3812IFE-5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 60V Current Mode Buck Controller
Lifecycle:
New from this manufacturer.
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