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PDF LT8610AB Data sheet ( Hoja de datos )
| Número de pieza | LT8610AB | |
| Descripción | 3.5A Synchronous Step-Down Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n LT8610 Feature Set, Plus:
3.5A Maximum Output Current
Fast 30ns Minimum Switch-On Time
Improved Burst Mode Efficiency (LT8610AB Only)
Improved EMI
n Wide Input Voltage Range: 3.4V to 42V
n Ultralow Quiescent Current Burst Mode® Operation:
2.5μA IQ Regulating 12VIN to 3.3VOUT
n Fixed Output Voltages: 3.3V, 5V
n Output Ripple < 10mVP-P (LT8610A Only)
n High Efficiency Synchronous Operation:
95% Efficiency at 1A, 5VOUT from 12VIN
93% Efficiency at 1A, 3.3VOUT from 12VIN
n Low Dropout Under All Conditions: 200mV at 1A
n Safely Tolerates Inductor Saturation in Overload
n Adjustable and Synchronizable Frequency:
200kHz to 2.2MHz
n Accurate 1V Enable Pin Threshold
n Output Soft-Start and Tracking
n Small Thermally Enhanced 16-Lead MSOP Package
APPLICATIONS
n Automotive and Industrial Supplies
n GSM Power Supplies
LT8610A/LT8610AB Series
42V, 3.5A Synchronous
Step-Down Regulator with
2.5µA Quiescent Current
DESCRIPTION
The LT®8610A/LT8610AB series are compact, high ef-
ficiency, high speed synchronous monolithic step-down
switching regulators that consume only 2.5µA of quies-
cent current. Compared to the LT8610, they have higher
maximum output currents of 3.5A and a faster minimum
switch-on time of 30ns. The LT8610A has the same low
ripple burst mode performance of the LT8610, while the
LT8610AB has even higher light load efficiency.
The other features of the LT8610 remain unchanged in the
LT8610A/LT8610AB series. A SYNC pin allows synchroni-
zation to an external clock. The EN/UV pin has an accurate
1V threshold for VIN undervoltage lockout or shut down.
A capacitor on the TR/SS pin programs the output voltage
ramp rate during startup. The PG flag signals when VOUT
is within ±9% of the programmed output voltage as well
as fault conditions.
OUTPUT
CURRENT
MINIMUM
ON TIME
1mA LOAD
EFFICIENCY**
LT8610*
2.5A 50ns 82%
LT8610A
3.5A 30ns 82%
LT8610AB
3.5A 30ns 91%
*See LT8610 data sheet. **VIN = 12V, VOUT = 3.3V, L = 4.7µH
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
VIN
5.5V TO 42V
5V 3.5A Step-Down Converter
4.7µF
10nF
1µF
VIN BST
EN/UV
PG LT8610AB-5 SW
SYNC
BIAS
TR/SS
INTVCC
RT
VOUT
GND
60.4k
0.1µF
4.7µH
fSW = 700kHz
8610ab TA01a
VOUT
5V
47µF 3.5A
×2
LT8610AB Efficiency at 5VOUT
100
90
80
70
60
50
40
30
0.1
VIN = 12V
VIN = 24V
VIN = 36V
1 10 100
LOAD CURRENT (mA)
1000
8610ab TA01b
For more information www.linear.com/LT8610A
8610abfa
1
1 page  
LT8610A/LT8610AB Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT8610AB Efficiency at 5VOUT
100
95
90
85
80
75 fSW = 700kHz
70 L = IHLP-2020BZ-01, 4.7µH
65
60 VIN = 12V
55
50
VIN = 24V
VIN = 36V
0 0.5 1 1.5 2 2.5 3 3.5
LOAD CURRENT (A)
8610ab G01
LT8610AB Efficiency at 3.3VOUT
100
90
80
70
60
fSW = 700kHz
L = IHLP-2020BZ-01, 4.7µH
50
40
30
20
0.01
VIN = 12V
VIN = 24V
VIN = 36V
0.1 1 10 100
LOAD CURRENT (mA)
1000
8610ab G04
LT8610A Efficiency at 3.3VOUT
100
95
90
85
80
75 fSW = 700kHz
70 L = IHLP-2020BZ-01, 4.7µH
65
60 VIN = 12V
55 VIN = 24V
50 VIN = 36V
0 0.5 1 1.5 2 2.5 3 3.5
LOAD CURRENT (A)
8610ab G44
LT8610AB Efficiency at 5VOUT
100
90
80
70
60
fSW = 700kHz
L = IHLP-2020BZ-01, 4.7µH
50
40
30
20
0.01
VIN = 12V
VIN = 24V
VIN = 36V
0.1 1 10 100
LOAD CURRENT (mA)
1000
8610ab G03
LT8610A Efficiency at 5VOUT
100
95
90
85
80
75 fSW = 700kHz
70 L = IHLP-2020BZ-01, 4.7µH
65
60 VIN = 12V
55 VIN = 24V
50 VIN = 36V
0 0.5 1 1.5 2 2.5 3 3.5
LOAD CURRENT (A)
8610ab G42
LT8610A Efficiency at 3.3VOUT
100
fSW = 700kHz
90 L = IHLP-2020BZ-01, 4.7µH
80
70
60
50
40
30
20
0.01
VIN = 12V
VIN = 24V
VIN = 36V
0.1 1 10 100
LOAD CURRENT (mA)
1000
8610ab G45
LT8610AB Efficiency at 3.3VOUT
100
95
90
85
80
75 fSW = 700kHz
70 L = IHLP-2020BZ-01, 4.7µH
65
60 VIN = 12V
55 VIN = 24V
50 VIN = 36V
0 0.5 1 1.5 2 2.5 3 3.5
LOAD CURRENT (A)
8610ab G02
LT8610A Efficiency at 5VOUT
100
90
80
70
60
fSW = 700kHz
L = IHLP-2020BZ-01, 4.7µH
50
40
30
20
0.01
VIN = 12V
VIN = 24V
VIN = 36V
0.1 1 10 100
LOAD CURRENT (mA)
1000
8610ab G43
LT8610A/LT8610AB
Efficiency vs Frequency at 1A
100 VOUT = 3.3V
95 L = IHLP-2020BZ-01, 4.7µH
90
85
80
75
70
65 VIN = 12V
VIN = 24V
60
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25
SWITCHING FREQUENCY (MHz)
8610ab G05
For more information www.linear.com/LT8610A
8610abfa
5
5 Page 
BLOCK DIAGRAM
LT8610A/LT8610AB Series
VIN
VIN
CIN 5, 6
INTERNAL 0.97V REF
R3 1V +
OPT 4 EN/UV
– SHDN
R4
OPT
15 PG
VOUT
ERROR
±9% AMP
++–
C1 R1
R2 16 FB
SHDN
TSD
IVNINTVUCVCLUOVLO
2.2µA
LT8610A/LT8610AB
ONLY
–
+
SLOPE COMP
3.4V
REG
OSCILLATOR
200kHz TO 2.2MHz
VC BURST
DETECT
SWITCH
LOGIC
AND
ANTI-
SHOOT
THROUGH
SHDN
TSD
VIN UVLO
VOUT
16 VOUT
C1
R1
LT8610A-3.3/LT8610A-5
LT8610AB-3.3/LT8610AB-5
ONLY
R2
2 TR/SS
CSS
OPT
3 RT
RT
1 SYNC
BIAS 14
INTVCC 13
BST 12
M1
SW
9-11
M2
GND
8
CVCC
CBST
L
COUT
VOUT
GND
17
8610ab BD
For more information www.linear.com/LT8610A
8610abfa
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LT8610AB.PDF ] | |
Hoja de datos destacado
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