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PDF LT8609S Data sheet ( Hoja de datos )
| Número de pieza | LT8609S | |
| Descripción | 2A/3A Peak Synchronous Step-Down Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT8609S
42V, 2A/3A Peak
Synchronous Step-Down Regulator
with 2.5µA Quiescent Current
Features
Description
nn Silent Switcher® 2 Architecture
nn Ultralow EMI/EMC Emissions on Any PCB
nn Eliminates PCB Layout Sensitivity
nn Internal Bypass Capacitors Reduce Radiated EMI
nn Optional Spread Spectrum Modulation
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, 12VIN to 5VOUT
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 Allows Use of Small Inductors
nn Low Dropout
nn Peak Current Mode Operation
nn Internal Compensation
nn Output Soft-Start and Tracking
nn Small 16-Lead 3mm × 3mm LQFN Package
Applications
nn General Purpose Step Down
nn Low EMI Step Down
The LT®8609S is a compact, high efficiency, high speed
synchronous monolithic step-down switching regulator
that consumes only 1.7µA of non-switching quiescent
current. The LT8609S can deliver 2A of continuous cur-
rent with peak loads of 3A (<1sec) to support applications
such as GSM transceivers which require high transient
loads. Top and bottom power switches are included with
all necessary circuitry to minimize the need for external
components. Low ripple 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 of switching frequencies 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 undervoltage lockout or to shut down
the LT8609S reducing the input supply current to 1µA. 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 LT8609S is available in a
small 16-lead 3mm × 3mm LQFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and Silent Switcher are
registered trademarks of Analog Devices, Inc. All other trademarks are the property of their
respective owners.
Typical Application
VIN
5.5V TO 40V
5V, 2MHz Step Down
4.7µF ON OFF
1µF 18.2k
VIN
EN/UV
SYNC
SW
LT8609S
INTVCC
TR/SS
PG
RT FB
GND
2.2µH
10pF
VOUT
5V
2A
1M
182k
22µF
8609S 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
8609S TA01b
For more information www.linear.com/LT8609S
8609sf
1
1 page  
Typical Performance Characteristics
LT8609S
Top FET Current Limit
vs Duty Cycle
5.50
5.25
5.00
4.75
4.50
4.25
4.00
3.75
3.50
0
20 40 60
DUTY CYCLE (%)
80 100
8609S G10
Switch Drop vs Switch Current
800
700
600
500
400
300
200
100
0
0
TOP SW
BOT SW
0.5 1 1.5 2 2.5 3
SWITCH CURRENT (A)
8609S G13
Top FET Current Limit
vs Temperature
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
–50
–10 30
70 110 150
TEMPERATURE (°C)
8609S G11
Minimum On-Time
vs Temperature
70
60
50
40
30
20
10 SYNC = 2V, 1.5A OUT
0 SYNC = 0V, 1.5A OUT
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
8609S G14
Switch Drop vs Temperature
350 SWITCH CURRENT = 1A
300
250
200
150
100
50
0
TOP SW
BOT SW
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
8609S G12
Minimum Off-Time
vs Temperature
150
140
VIN = 6V
ILOAD = 1A
130
120
110
100
90
80
70
60
50
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
8609S G15
Dropout Voltage vs Load Current
800
700
600
500
400
300
200
100
0
0 0.5 1 1.5 2 2.5 3
LOAD CURRENT (A)
8609S G16
Switching Frequency
vs Temperature
2.005
2.000
1.995
1.990
1.985
1.980
1.975
RT = 18.2kΩ
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
8609S G17
For more information www.linear.com/LT8609S
8609sf
5
5 Page 
Block Diagram
VIN VIN
CIN
0.2µF
INTERNAL 0.774V 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
SWITCH
DETECT
LOGIC
AND
ANTI-
SHOOT
THROUGH
SHDN
TSD
VIN UVLO
LT8609S
0.1µF
INTVCC
CBST
M1
SW
M2
GND
CVCC
L
COUT
VOUT
8609S BD
For more information www.linear.com/LT8609S
8609sf
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LT8609S.PDF ] | |
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