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PDF LTC3630 Data sheet ( Hoja de datos )
| Número de pieza | LTC3630 | |
| Descripción | 65V 500mA Synchronous Step-Down Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n Wide Operating Input Voltage Range: 4V to 65V
n Synchronous Operation for Highest Efficiency
n Internal High Side and Low Side Power MOSFETs
n No Compensation Required
n Adjustable 50mA to 500mA Maximum Output Current
n Low Dropout Operation: 100% Duty Cycle
n Low Quiescent Current: 12µA
n Wide Output Range: 0.8V to VIN
n 0.8V ±1% Feedback Voltage Reference
n Precise RUN Pin Threshold
n Internal and External Soft-Start
n Programmable 1.8V, 3.3V, 5V or Adjustable Output
n Few External Components Required
n Low Profile (0.75mm) 3mm × 5mm DFN and
Thermally-Enhanced MSE16 Packages
APPLICATIONS
n Industrial Control Supplies
n Medical Devices
n Distributed Power Systems
n Portable Instruments
n Battery-Operated Devices
n Automotive
n Avionics
LTC3630
High Efficiency, 65V
500mA Synchronous
Step-Down Converter
DESCRIPTION
The LTC®3630 is a high efficiency step-down DC/DC
converter with internal high side and synchronous power
switches that draws only 12μA typical DC supply current
while maintaining a regulated output voltage at no load.
The LTC3630 can supply up to 500mA load current and
features a programmable peak current limit that provides
a simple method for optimizing efficiency and for reduc-
ing output ripple and component size. The LTC3630’s
combination of Burst Mode® operation, integrated power
switches, low quiescent current, and programmable peak
current limit provides high efficiency over a broad range
of load currents.
With its wide input range of 4V to 65V, the LTC3630 is a
robust converter suited for regulating a wide variety of
power sources. Additionally, the LTC3630 includes a precise
run threshold and soft-start feature to guarantee that the
powerwww.DataSheet.co.kr system start-up is well-controlled in any environ-
ment. A feedback comparator output enables multiple
LTC3630s to be paralleled in higher current applications.
The LTC3630 is available in the thermally-enhanced
3mm × 5mm DFN and the MSE16 packages.
L, LT, LTC, LTM, Burst Mode, 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.
TYPICAL APPLICATION
4V to 65V Input to 3.3V Output, 500mA Step-Down Converter
VIN
4V TO 65V
2.2µF
VIN SW
LTC3630
RUN VFB
SS
VPRG1 VPRG2
FBO ISET
GND
47µH
3630 TA01a
VOUT
3.3V
100µF
×2
500mA
Efficiency vs Load Current
100 VOUT = 3.3V
90
VIN = 12V
80
70
VIN = 65V
60
50
40
30
0.1
ISET = 220kΩ||220pF
ISET = OPEN
1 10 100 1000
LOAD CURRENT (mA)
3630 TA01b
3630f
1
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3630
Efficiency vs Input Voltage
95 VOUT = 5V
90 FIGURE 13 CIRCUIT
85
80
75
70
65
60
55
10
ILOAD = 500mA
ILOAD = 100mA
ILOAD = 10mA
ILOAD = 1mA
20 30 40 50
INPUT VOLTAGE (V)
60
3630 G07
Feedback Comparator Trip
Voltage vs Temperature
0.804 VIN = 12V
0.802
0.800
0.798
0.796
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3630 G10
Peak Current Trip Threshold
vs RISET
1400 VIN = 12V
1200
1000
800
600
400
200
0
0 50 100 150 200 250
RISET (kΩ)
3630 G13
Line Regulation vs Input Voltage
0.05 FIGURE 13 CIRCUIT
0.04 ILOAD = 500mA
0.03
0.02
0.01
0
–0.01
–0.02
–0.03
–0.04
–0.05
5
15 25 35 45
INPUT VOLTAGE (V)
55
65
3630 G08
Feedback Comparator Hysteresis
vs Temperature
5.5
5.4
VIN = 12V
5.3
5.2
5.1
5.0
4.9
www.DataSheet.co.kr
4.8
4.7
4.6
4.5
–55 –25
5 35 65 95 125 155
TEMPERATURE (°C)
3630 G11
Peak Current Trip Threshold
vs Input Voltage
1400
1200
ISET = OPEN
1000
800
ISET = 100k
600
400
200 ISET = 0V
0
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
3630 G14
Load Regulation vs Load Current
5.04 VIN = 12V
5.03
VOUT = 5V
FIGURE 13 CIRCUIT
5.02
5.01
5.00
4.99
4.98
4.97
4.96
0
100 200 300 400
LOAD CURRENT (mA)
500
3630 G09
Peak Current Trip Threshold
vs Temperature and ISET
1400 VIN = 12V
1200
ISET OPEN
1000
800
600 RISET = 100kΩ
400
200 ISET = GND
0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3630 G12
vQsuiIenspcuetnVtoVltIaNgSeupply Current
16
14 SLEEP
12
10
8 SHUTDOWN
6
4
2
0
5 15 25 35 45 55 65
VIN VOLTAGE (V)
3630 G15
3630f
5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
LTC3630
APPLICATIONS INFORMATION
The basic LTC3630 application circuit is shown on the front
page of the data sheet. External component selection is
determined by the maximum load current requirement and
begins with the selection of the peak current programming
resistor, RISET. The inductor value L can then be determined,
followed by capacitors CIN and COUT.
Peak Current Resistor Selection
The peak current comparator has a guaranteed maximum
current limit of 1A (1.2A typical), which guarantees a
maximum average current of 500mA. For applications
that demand less current, the peak current threshold can
be reduced to as little as 100mA (120mA typical). This
lower peak current allows the use of lower value, smaller
components (input capacitor, output capacitor, and induc-
tor), resulting in lower input supply ripple and a smaller
overall DC/DC converter.
The threshold can be easily programmed using a resis-
tor (RISET) between the ISET pin and ground. The voltage
generated on the ISET pin by RISET and the internal 5µA
current source sets the peak current. The voltage on the
ISET pin is internally limited within the range of 0.1V to
1.0V. The value of resistor for a particular peak current can
be selected by using Figure 2 or the following equation:
RISET = IPEAK • 0.2 • 106
where 100mA < IPEAK < 1A.
The internal 5μA current source is reduced to 1μA in sleep
mode to maximize efficiency and to facilitate a trade-off
220
200
180
160
140
120
100
80
60
40
20
0
50 100 150 200 250 300 350 400 450 500
MAXIMUM LOAD CURRENT (mA)
3630 F02
Figure 2. RISET Selection
between efficiency and light load output voltage ripple, as
described in the CISET Selection section of the Applica-
tions Information. For maximum efficiency, minimize the
capacitance on the ISET pin and place the RISET resistor
as close to the pin as possible.
The typical peak current is internally limited to be within the
range of 120mA to 1.2A. Shorting the ISET pin to ground
programs the current limit to 120mA, and leaving it float
sets the current limit to the maximum value of 1.2A. When
selecting this resistor value, be aware that the maximum
average output current for this architecture is limited to
half of the peak current. Therefore, be sure to select a value
that sets the peak current with enough margin to provide
adequate load current under all conditions. Selecting the
peak current to be 2.2 times greater than the maximum
load current is a good starting point for most applications.
Inductor Selection
The inductor, input voltage, output voltage, and peak cur-
rent determine the switching frequency during a burst
cycle of the LTC3630. For a given input voltage, output
voltage,www.DataSheet.co.kr and peak current, the inductor value sets the
switching frequency during a burst cycle when the output
is in regulation. Generally, switching between 50kHz and
250kHz yields high efficiency, and 200kHz is a good first
choice for many applications. The inductor value can be
determined by the following equation:
L
=
f
VOUT
• IPEAK
•
1–
VOUT
VIN
The variation in switching frequency during a burst cycle
with input voltage and inductance is shown in Figure 3. For
lower values of IPEAK, multiply the frequency in Figure 3
by 1.2A/IPEAK.
An additional constraint on the inductor value is the
LTC3630’s 150ns minimum on-time of the high side switch.
Therefore, in order to keep the current in the inductor well-
controlled, the inductor value must be chosen so that it
is larger than a minimum value which can be computed
as follows:
L
>
VIN(MAX) • tON(MIN)
IPEAK
• 1.2
3630f
11
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC3630.PDF ] | |
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