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PDF LTC3824 Data sheet ( Hoja de datos )
| Número de pieza | LTC3824 | |
| Descripción | High Voltage Step-Down Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURESwww.datasheet4u.com
n Wide Input Range: 4V to 60V
n Current Mode Constant Frequency PWM
n Very Low Dropout Operation: 100% Duty Cycle
n Programmable Switching Frequency:
200kHz to 600kHz
n Selectable High Efficient Burst Mode® Operation:
40μA Quiescent Current
n Easy Synchronization
n 8V, 2A Gate Drive (VCC > 10V) for Industrial High
Voltage P-channel MOSFET
n Programmable Soft-Start
n Programmable Current Limit
n Available in a Small 10-Pin Thermally Enhanced
MSE Package
APPLICATIONS
n Industrial and Automotive Power Supplies
n Telecom Power Supplies
n Distributed Power Systems
LTC3824
High Voltage Step-Down
Controller With 40µA
Quiescent Current
DESCRIPTION
The LTC®3824 is a step-down DC/DC controller designed
to drive an external P-channel MOSFET. With a wide input
range of 4V to 60V and a high voltage gate driver, the
LTC3824 is suitable for many industrial and automotive
high power applications. Constant frequency current mode
operation provides excellent performance.
The LTC3824 can be configured for Burst Mode operation.
Burst Mode operation enhances low current efficiency
(only 40μA quiescent current) and extends battery run
time. The switching frequency can be programmed up to
600kHz and is easily synchronizable.
Other features include current limit, soft-start, micropower
shutdown, and Burst Mode disable.
The LTC3824 is available in a 10-lead MSE power package.
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5731964.
TYPICAL APPLICATION
VIN
5.5V TO 60V
CIN +
33μF
100V
5V/2A Buck Converter
CCAP
0.1μF
CAP
VCC
SENSE
LTC3824
RS
0.025Ω
392k
RSET
GND
GATE
22μH
100pF
VOUT
5V
COUT 2A
100μF
s2
SYNC/MODE
SS VC
VFB
0.1μF
10k
51Ω 422k
80.6k
3824 TA01
3.3nF
Efficiency and Power Loss vs Load Current
100 2.5
90 EFFICIENCY
80
VIN = 12V
VIN = 40V
2.0
1.5
70 1.0
60
50
10
POWER LOSS
VIN = 40V
VIN = 12V
100 1000
LOAD CURRENT (mA)
0.5
0
2000
3824 TA01a
3824fc
1
1 page  
LTC3824
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.
www.datasheet4u.com
Burst Mode Operation VOUT = 5V
VIN =12V, VOUT= 5V, ILOAD = 200mA
VOUT
50mV/DIV
Load Current Step Response
OUTPUT VOLTAGE
AC COUPLED
100mV/DIV
INDUCTOR
CURRENT
1A/DIV
50μs/DIV
3824 G09
INDUCTOR
CURRENT
2A/DIV
100μs/DIV
3824 G10
PIN FUNCTIONS
GND (Pin 1): Chip Ground Pin.
SYNC/MODE (Pin 2): Synchronization Input and Burst
Mode Operation Enable/Disable. If this pin is left open
or pulled higher than 2V, Burst Mode operation will be
enabled at light load and the typical threshold of entering
Burst Mode operation is one third of current limit. If this
pin is grounded or the synchronization pulse is present
with a frequency greater than 20kHz then Burst Mode
operation is disabled and the LTC3824 goes into pulse
skipping at light loads. To synchronize the LTC3824, the
duty cycle of the synchronizing pulse can range from 10%
to 70% and the synchronizing frequency has to be higher
than the programmed frequency.
RSET (Pin 3): A resistor from RSET to ground sets the
LTC3824 switching frequency.
VC (Pin 4): The Output of the voltage error amplifier gm
and the control signal of the current mode PWM control
loop. Switching starts at 0.7V, and higher VC corresponds
to higher inductor current. When VC is pulled below 25mV,
the LTC3824 goes into micropower shutdown.
VFB (Pin 5): Error Amplifier Inverting Input. A resistor
divider to this pin sets the output voltage. When VFB is
less than 0.5V, the switching frequency will fold back to
50kHz to reduce the minimum on-cycle.
SS (Pin 6): Soft-Start Pin. A capacitor on this pin sets
the output ramp-up rate. The typical time for SS to
reach the programmed level is (C • 0.8V)/7μA.
SENSE (Pin 7): Current Sense Input Pin. A sense re-
sistor, RS, from VIN to SENSE sets the current limit to
100mV/RS.
VCC (Pin 8): Chip Power Supply. Power supply bypass-
ing is required.
GATE (Pin 9): Gate Drive for The External P-channel
MOSFET. Typical peak drive current is 2.5A and the drive
voltage is clamped to 8V when VCC is higher than 9V.
CAP (Pin 10): A Low ESR Capacitor of at Least 0.1μF is
required from this pin to VCC to bypass the internal regula-
tor for biasing the gate driver circuitry.
Exposed Pad (Pin 11): GND. Must be soldered to PCB with
expanded metal trace for rated thermal performance.
3824fc
5
5 Page 
LTC3824
TYPICAL APPLICATION
VIN
12.5V TO 60V
www.datasheet4u.com
CIN1 +
33μF
100V
12V 2A Buck Converter
CIN2
2.2μF
100V
CCAP
0.1μF
CAP
VCC
SYNC/MODE SENSE
100pF
CIN1: SANYO 63MV68AX
CIN2: TDK C4532X7R2A225M
COUT: SANYO OSCON, 16SP270M, TDKC2012X7RIC105K
L1: D104C919AS-330M
D1: SS3H9
Q1: Si7465DP
RS
0.025Ω
LTC3824
301k
RSET
GND
GATE
SS
0.1μF
VFB
VC
15k
1000pF
Q1 L1
33μH
1000pF
D1
+
68k 113k
COUT
270μF
VOUT
12V
1μF 2A
16V
X7R
8.06k
3824 TA02
PACKAGE DESCRIPTION
MSE Package
10-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1664 Rev B)
5.23
(.206)
MIN
2.794 p 0.102
(.110 p .004)
0.889 p 0.127
(.035 p .005)
BOTTOM VIEW OF
EXPOSED PAD OPTION
2.06 p 0.102
1 (.081 p .004)
1.83 p 0.102
(.072 p .004)
3.00 p 0.102
(.118 p .004)
(NOTE 3)
10 9 8 7 6
2.083 p 0.102 3.20 – 3.45
(.082 p .004) (.126 – .136)
4.90 p 0.152
(.193 p .006)
0.497 p 0.076
(.0196 p .003)
REF
3.00 p 0.102
(.118 p .004)
(NOTE 4)
0.305 p 0.038
(.0120 p .0015)
TYP
0.50
(.0197)
BSC
RECOMMENDED SOLDER PAD LAYOUT
10
0.18
(.007)
DETAIL “A”
0.254
(.010)
GAUGE PLANE
DETAIL “A”
0o – 6o TYP
SEATING
PLANE
0.53 p 0.152
(.021 p .006)
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
12345
1.10
(.043)
MAX
0.17 – 0.27
(.007 – .011)
TYP
0.50
(.0197)
BSC
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
0.86
(.034)
REF
0.1016 p 0.0508
(.004 p .002)
MSOP (MSE) 0307 REV B
3824fc
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3824.PDF ] | |
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