|
|
PDF LT8609A Data sheet ( Hoja de datos )
| Número de pieza | LT8609A | |
| Descripción | 2A/3A Peak Synchronous Step-Down Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LT8609A (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
|
No Preview Available !
LT8609/LT8609A/LT8609B
42V, 2A/3A Peak
Synchronous Step-Down Regulator
with 2.5µA Quiescent Current
FEATURES
DESCRIPTION
nn Wide Input Voltage Range: 3.0V to 42V
nn Ultralow Quiescent Current Burst Mode® Operation:
nn <2.5µA IQ Regulating 12VIN to 3.3VOUT
nn Output Ripple <10mVP-P
nn High Efficiency 2MHz Synchronous Operation:
nn >93% Efficiency at 1A, 5VOUT from 12VIN
nn 2A Maximum Continuous Output, 3A Peak
Transient Output
nn Fast Minimum Switch-On Time: 45ns
nn Adjustable and Synchronizable: 200kHz to 2.2MHz
nn Spread Spectrum Frequency Modulation for Low EMI
nn Allows Use of Small Inductors
nn Low Dropout
nn Peak Current Mode Operation
nn Accurate 1V Enable Pin Threshold
nn Internal Compensation
nn Output Soft-Start and Tracking
nn Small 10-Lead MSOP Package
APPLICATIONS
nn GSM Transceivers
nn General Purpose Step-Down
nn Low EMI Step-Down
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
The LT®8609/LT8609A/LT8609B is a compact, high ef-
ficiency, high speed synchronous monolithic step-down
switching regulator that consumes only 1.7µA of non-
switching quiescent current. The LT8609/LT8609A/LT8609B
can deliver 2A of continuous current with peak loads of
3A (<1sec). Burst Mode operation enables high efficiency
down to very low output currents while keeping the output
ripple below 10mVP-P. A SYNC pin allows synchronization to
an external clock, or spread spectrum modulation for low EMI
operation. Internal compensation with peak current mode
topology allows the use of small inductors and results in fast
transient response and good loop stability. The EN/UV pin
has an accurate 1V threshold and can be used to program
VIN UVLO or to shut down the part. A capacitor on the TR/SS
pin programs the output voltage ramp rate during start-up
while the PG flag signals when VOUT is within ±8.5% of the
programmed output voltage as well as fault conditions. The
LT8609A has slower switch edges for lower EMI emissions.
The LT8609B operates in pulse-skipping mode only.
LT8609
LT8609A
LT8609B
PULSE-SKIPPING MODE,
Burst Mode OPERATION
Both
Both
Pulse-Skipping
SWITCH EDGE SPEED
Fast
Medium
Fast
TYPICAL APPLICATION
VIN
5.5V TO 40V
5V, 2MHz Step-Down
4.7µF ON OFF
1µF 18.2k
VIN
EN/UV
BST
SYNC
SW
LT8609
INTVCC
TR/SS
PG
RT FB
GND
0.1µF 2.2µH
10pF
VOUT
5V
2A
1M
187k
22µF
8609 TA01a
100
95
90
85
80
75
70
65
60
55
50
0
12VIN to 5VOUT Efficiency
fSW = 2MHz
0.50
1.00 1.50
IOUT (A)
2.00 2.50
8609 TA01b
For more information www.linear.com/LT8609
8609fd
1
1 page  
LT8609/LT8609A/LT8609B
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency (3.3V Output,
Burst Mode Operation)
100
95 VIN = 12V
90
85 VIN = 24V
80
75
70
65
60
55
50 fSW = 700kHz
0 0.50 1.00 1.50 2.00 2.50
IOUT (A)
8609 G01
Log of Efficiency (5V Output,
Burst Mode Operation)
100
90 VIN = 12V
80
70 VIN = 24V
60
50
40
30
20
10
0
0.001
fSW = 700kHz
0.1 10
IOUT (mA)
1000
8609 G04
Efficiency (5V Output, 2MHz,
Burst Mode Operation)
100
95 VIN = 12V
90
85 VIN = 24V
80
75
70
65
60
55
L = 2.2µH
fSW = 2MHz
50
0 0.50 1.00 1.50 2.00 2.50
IOUT (A)
8609 G07
Efficiency (3.3V Output,
Burst Mode Operation)
100
90 VIN = 12V
80
70 VIN = 24V
60
50
40
30
20
10
0
0.001
fSW = 700kHz
0.1 10
IOUT (mA)
1000
8609 G02
Efficiency (3.3V Output, 2MHz,
Burst Mode Operation)
100
95
90
VIN = 12V
85 VIN = 24V
80
75
70
65
60
55
L = 2.2µH
fSW = 2MHz
50
0 0.50 1.00 1.50 2.00 2.50
IOUT (A)
8609 G05
Efficiency (5V Output, 2MHz,
Burst Mode Operation)
100
90 VIN = 12V
80
70 VIN = 24V
60
50
40
30
20
10
0
0.001
0.1 10
IOUT (mA)
L = 2.2µH
fSW = 2MHz
1000
8609 G08
For more information www.linear.com/LT8609
Efficiency (5V Output, Burst
Mode Operation)
100
95 VIN = 12V
90
85
VIN = 24V
80
75
70
65
60
55
50 fSW = 700kHz
0 0.50 1.00 1.50 2.00 2.50
IOUT (A)
8609 G03
Efficiency (3.3V Output, 2MHz,
Burst Mode Operation)
100
90 VIN = 12V
80
70 VIN = 24V
60
50
40
30
20
10
0
0.001
0.1 10
IOUT (mA)
L = 2.2µH
fSW = 2MHz
1000
8609 G06
FB Voltage
785
784
783
782
781
780
779
778
777
776
775
–50
–10 30
70 110 150
TEMPERATURE (°C)
8609 G09
8609fd
5
5 Page 
BLOCK DIAGRAM
LT8609/LT8609A/LT8609B
VIN VIN
CIN
INTERNAL 0.782V REF
R3
OPT
1V
EN/UV
+
–
SHDN
R4
OPT
PG
±8.5%
ERROR
AMP
++–
VOUT
R1
R2
FB
SHDN
TSD
IVNINTVUCVCLUOVLO
CSS 2µA
TR/SS
RT RT
SYNC
–
+
SLOPE COMP
3.5V
REG
OSCILLATOR
200kHz TO 2.2MHz
VC BURST
DETECT
SWITCH
LOGIC
AND
ANTI-
SHOOT
THROUGH
SHDN
TSD
VIN UVLO
INTVCC
BST
M1
SW
M2
GND
CVCC
CBST
L
COUT
VOUT
8609 BD
For more information www.linear.com/LT8609
8609fd
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LT8609A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LT8609 | 2A/3A Peak Synchronous Step-Down Regulator | Linear Technology |
| LT8609A | 2A/3A Peak Synchronous Step-Down Regulator | Linear Technology |
| LT8609B | 2A/3A Peak Synchronous Step-Down Regulator | Linear Technology |
| LT8609S | 2A/3A Peak Synchronous Step-Down Regulator | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |