LT8390
60V Synchronous 4-Switch
Buck-Boost Controller
with Spread Spectrum
FEATURES DESCRIPTION
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4-Switch Single Inductor Architecture Allows V The LT 8390 is a synchronous 4-switch buck-boost DC/DC
IN
Above, Below or Equal to V controller that regulates output voltage, input or output
OUT
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Synchronous Switching: Up to 98% Efficiency current from an input voltage above, below, or equal to
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Proprietary Peak-Buck Peak-Boost Current Mode the output voltage. The proprietary peak-buck/peak-boost
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Wide V Range: 4V to 60V current mode control scheme allows adjustable and syn-
IN
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1.5% Output Voltage Accuracy: 1V V 60V chronizable 150kHz to 650kHz fixed frequency operation,
OUT
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3% Input or Output Current Accuracy with Monitor or internal 15% triangle spread spectrum frequency
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Spread Spectrum Frequency Modulation for Low EMI modulation for low EMI. With a 4V to 60V input voltage
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High Side PMOS Load Switch Driver range, 0V to 60V output voltage capability, and seamless low
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Integrated Bootstrap Diodes noise transitions between operation regions, the LT8390
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No Top MOSFET Refresh Noise in Buck or Boost is ideal for voltage regulator, battery and supercapacitor
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Adjustable and Synchronizable: 150kHz to 650kHz charger applications in automotive, industrial, telecom,
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V Disconnected from V During Shutdown and even battery-powered systems.
OUT IN
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Available in 28-Lead TSSOP with Exposed Pad and
The LT8390 provides input or output current monitor and
28-Lead QFN (4mm 5mm)
power good flag. Fault protection is also provided to detect
output short-circuit condition, during which the LT8390
APPLICATIONS
retries, latches off, or keeps running.
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Automotive, Industrial, Telecom Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
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High Power Battery-Powered System
TYPICAL APPLICATION
98% Efficient 48W (12V 4A) Miniature Buck-Boost Voltage Regulator
6uH V
4m 15m OUT
V
IN
12V
4V TO 56V
4A
22F 10F
4.7F
0.1F 0.1F
120F 120F
SW1 LSP LSN SW2
63V 100V 25V
16V 16V
2 2 BST1 BST2 2
Efficiency vs V
IN
BG1 BG2
100
GND
TG1 TG2 98
V LT8390 V
IN OUT
96
1F 1F
383k
EN/UVLO ISP 94
100k
LOADTG ISN
165k
92
TEST FB
SSFM OFF
9.09k 90
ISMON ISMON SYNC/SPRD
I LIMIT 6.7A
OUT
CTRL INTV SSFM ON
CC 88
4.7F I = 4A
OUT
100k
LOADEN
86
V PGOOD PGOOD 0 10 20 30 40 50 60
REF
SS V RT
INPUT VOLTAGE (V)
0.47F C
8390 TA01a
8390 TA01b
100k
0.1F 100pF
400kHz
27k
4.7nF
8390fa
1
For more information www.linear.com/LT8390
EFFICIENCY (%)LT8390
ABSOLUTE MAXIMUM RATINGS (Note 1)
V , EN/UVLO, V , ISP, ISN ....................................60V FB, LOADEN, SYNC/SPRD, CTRL, PGOOD ...................6V
IN OUT
(ISP-ISN) ..........................................................1V to 1V Operating Junction Temperature Range (Notes 2, 3)
BST1, BST2 ................................................................66V LT8390E ............................................. 40C to 125C
SW1, SW2, LSP, LSN ..................................... 6V to 60V LT8390I .............................................. 40C to 125C
INTV , (BST1-SW1), (BST2-SW2) ..............................6V LT8390H ............................................. 40C to 150C
CC
(BST1-LSP), (BST1-LSN) .............................................6V Storage Temperature Range ................... 65C to 150C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
BG1 1 28 BG2
BST1 2 27 BST2
SW1 3 26 SW2
28 27 26 25 24 23
TG1 4 25 TG2
TG1 1 22
TG2
LSP 5 24 V
OUT LSP 2 21 V
OUT
LSN 6 23 LOADTG LSN 3 20 LOADTG
29
V 4 19 SYNC/SPRD
V 7 22 SYNC/SPRD
IN 29
IN
GND
GND
INTV 5 18 RT
INTV 8 21 RT CC
CC
EN/UVLO 6 17
V
C
EN/UVLO 9 20 V
C
TEST 7 16 FB
TEST 10 19 FB
LOADEN 8 15 SS
LOADEN 11 18 SS
9 10 11 12 13 14
V 12 17 PGOOD
REF
CTRL 13 16 ISMON
ISP 14 15 ISN
UFD PACKAGE
28-LEAD (4mm 5mm) PLASTIC QFN
FE PACKAGE
28-LEAD PLASTIC TSSOP = 43C/W, = 3.4C/W
JA JC
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
= 30C/W, = 5C/W
JA JC
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION