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PDF LT8390 Data sheet ( Hoja de datos )
| Número de pieza | LT8390 | |
| Descripción | 60V Synchronous 4-Switch Buck-Boost Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT8390 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Features
nn 4-Switch Single Inductor Architecture Allows VIN
Above, Below or Equal to VOUT
nn Synchronous Switching: Up to 98% Efficiency
nn Proprietary Peak-Buck Peak-Boost Current Mode
nn Wide VIN Range: 4V to 60V
nn ±1.5% Output Voltage Accuracy: 1V ≤ VOUT ≤ 60V
nn ±3% Input or Output Current Accuracy with Monitor
nn Spread Spectrum Frequency Modulation for Low EMI
nn High Side PMOS Load Switch Driver
nn Integrated Bootstrap Diodes
nn No Top MOSFET Refresh Noise in Buck or Boost
nn Adjustable and Synchronizable: 150kHz to 650kHz
nn VOUT Disconnected from VIN During Shutdown
nn Available in 28-Lead TSSOP with Exposed Pad and
28-Lead QFN (4mm × 5mm)
Applications
nn Automotive, Industrial, Telecom Systems
nn High Power Battery-Powered System
LT8390
60V Synchronous 4-Switch
Buck-Boost Controller
with Spread Spectrum
Description
The LT®8390 is a synchronous 4-switch buck-boost DC/DC
controller that regulates output voltage, input or output
current from an input voltage above, below, or equal to
the output voltage. The proprietary peak-buck/peak-boost
current mode control scheme allows adjustable and syn-
chronizable 150kHz to 650kHz fixed frequency operation, or
internal ±15% triangle spread spectrum frequency modula-
tion for low EMI. With a 4V to 60V input voltage range, 0V
to 60V output voltage capability, and seamless low-noise
transitions between operation regions, the LT8390 is ideal
for voltage regulator, battery and supercapacitor charger
applications in automotive, industrial, telecom, and even
battery-powered systems.
The LT8390 provides input or output current monitor and
power good flag. Fault protection is also provided to detect
output short-circuit condition, during which the LT8390
retries, latches off, or keeps running.
L, LT, LTC, LTM, 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
4V TO 56V
98% Efficient 48W (12V 4A) Miniature Buck-Boost Voltage Regulator
4mΩ
6uH
15mΩ
22µF 4.7µF
63V 100V
×2 ×2
383k
165k
0.1µF
SW1 LSP
BST1
BG1
LSN
TG1
VIN
1µF
LT8390
EN/UVLO
LOADTG
TEST
SW2
BST2
BG2
GND
TG2
VOUT
ISP
ISN
FB
0.1µF
1µF
ISMON
IOUT LIMIT 6.7A
0.47µF
ISMON
CTRL
LOADEN
VREF
SS
0.1µF
SYNC/SPRD
INTVCC
4.7µF
PGOOD
VC
RT
8390 TA01a
100pF 27k
100k
400kHz
4.7nF
10µF
25V
×2
SSFM OFF
SSFM ON
100k
PGOOD
120µF
16V
VOUT
12V
4A
120µF
16V
100k
9.09k
100
98
96
94
92
90
88
86
0
Efficiency vs VIN
IOUT = 4A
10 20 30 40 50 60
INPUT VOLTAGE (V)
8390 TA01b
For more information www.linear.com/LT8390
8390f
1
1 page  
LT8390
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 1.5V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
SS Fault Latch-Off Threshold
SS Fault Reset Threshold
Oscillator
1.7
0.2
RT Pin Voltage
Switching Frequency
SYNC Frequency
SYNC/SPRD Input Bias Current
SYNC/SPRD Threshold Voltage
Highest Spread Spectrum Above Oscillator Frequency
Lowest Spread Spectrum Below Oscillator Frequency
Region Transition
Buck-Boost to Boost (VIN/VOUT)
Boost to Buck-Boost (VIN/VOUT)
Buck to Buck-Boost (VIN/VOUT)
Buck-Boost to Buck (VIN/VOUT)
Peak-Buck to Peak-Boost (VIN/VOUT)
Peak-Boost to Peak-Buck (VIN/VOUT)
NMOS Drivers
TG1, TG2 Gate Driver On-Resistance
Gate Pull-Up
Gate Pull-Down
BG1, BG2 Gate Driver On-Resistance
Gate Pull-Up
Gate Pull-Down
TG1, TG2 Rise Time
TG1, TG2 Fall Time
BG1, BG2 Rise Time
BG1, BG2 Fall Time
TG Off to BG On Delay
BG Off to TG On Delay
TG1 Minimum Duty Cycle in Buck Region
RT = 100kΩ
VSYNC/SPRD = 0V, RT = 226kΩ
VSYNC/SPRD = 0V, RT = 100kΩ
VSYNC/SPRD = 0V, RT = 59.0kΩ
VSYNC/SPRD = 5V
VSYNC/SPRD = 5V
VSYNC/SPRD = 5V
V(BST-SW) = 5V
VINTVCC = 5V
CL = 3.3nF, 10% to 90%
CL = 3.3nF, 90% to 10%
CL = 3.3nF, 10% to 90%
CL = 3.3nF, 90% to 10%
CL = 3.3nF
CL = 3.3nF
Peak-Buck Current Mode
l 190
l 380
l 570
150
–0.1
0.4
12.5
–17.7
1.00
200
400
600
0
14.5
–15.7
210
420
630
650
0.1
1.5
16.5
–13.7
0.73 0.75 0.77
0.83 0.85 0.87
1.16 1.18 1.20
1.31 1.33 1.35
0.96 0.98 1.00
1.00 1.02 1.04
2.6
1.4
3.2
1.2
25
20
25
20
60
60
10
TG1 Maximum Duty Cycle in Buck Region
TG1 Fixed Duty Cycle in Buck-Boost Region
BG2 Fixed Duty Cycle in Buck-Boost Region
BG2 Minimum Duty Cycle in Boost Region
BG2 Maximum Duty Cycle in Boost Region
Peak-Buck Current Mode
Peak-Boost Current Mode
Peak-Buck Current Mode
Peak-Boost Current Mode
Peak-Boost Current Mode
95
85
15
10
95
UNITS
V
V
V
kHz
kHz
kHz
kHz
µA
V
%
%
Ω
Ω
Ω
Ω
ns
ns
ns
ns
ns
ns
%
%
%
%
%
%
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT8390E is guaranteed to meet performance specifications
from 0°C to 125°C operating junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LT8390I is guaranteed over the –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3: The LT8390 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability.
For more information www.linear.com/LT8390
8390f
5
5 Page 
Block Diagram
LT8390
INTVCC
VREF
VIN
5V LDO
2V REF
RT
SYNC/SPRD
CTRL
0.3V +
–
ISMON
1X VIS
EN/UVLO
1.220V
2.5µA
–
+
LSN LSP
+
A1
–
OSC VOS
FBOV
INHIBIT
SWITCH
ISOC
+ FB
– 1.1V
+ VISP-ISN
– 0.75V
LOADEN
TEST
VOUT LOADON
PWMTG
VOUT –5V
PGOOD
0.25V
FB
+
–
SHORT
+ 1.1V
– FB
+ FB
– 0.9V
LED
FAULT
LOGIC
VREF
12.5µA
1.25µA
LOADON
SS VC
+
A3
–
PEAK_BUCK
LOADON
BUCK
LOGIC
INTVCC
D1
INTVCC
BST1
TG1
SW1
BG1
VOUT/BST2
VIN/BST1
CHARGE
CONTROL
LOADON
PEAK_BOOST
+
A4
–
GND
BG2
BOOST
LOGIC
INTVCC
+
EA1 +
–
D2
INTVCC
1V
SW2
TG2
BST2
FB
+ CTRL
+ 1.25V
EA2
–
+–
VIS 0.25V
+
A2=10
–
ISP
ISN
8391 BD
For more information www.linear.com/LT8390
8390f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT8390.PDF ] | |
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