LT8390
60V Synchronous 4-Switch
Buck-Boost Controller
with Spread Spectrum
DESCRIPTION
FEATURES
TheLT®8390isasynchronous4-switchbuck-boostDC/DC
controller that regulates output voltage, input or output
current from an input voltage above, below, or equal to
theoutputvoltage. Theproprietarypeak-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
n
4-Switch Single Inductor Architecture Allows V
IN
Above, Below or Equal to V
OUT
n
n
n
n
n
n
n
n
n
n
n
n
Synchronous Switching: Up to 98% Efficiency
Proprietary Peak-Buck Peak-Boost Current Mode
Wide V Range: 4V to 60V
IN
±1.5% Output Voltage Accuracy: 1V ≤ V
≤ 60V
OUT
±3% Input or Output Current Accuracy with Monitor
Spread Spectrum Frequency Modulation for Low EMI modulation for low EMI. With a 4V to 60V input voltage
High Side PMOS Load Switch Driver
Integrated Bootstrap Diodes
No Top MOSFET Refresh Noise in Buck or Boost
Adjustable and Synchronizable: 150kHz to 650kHz
range,0Vto60Voutputvoltagecapability,andseamlesslow
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.
V
Disconnected from V During Shutdown
OUT
IN
Available in 28-Lead TSSOP with Exposed Pad and
The LT8390 provides input or output current monitor and
powergoodflag.Faultprotectionisalsoprovidedtodetect
output short-circuit condition, during which the LT8390
retries, latches off, or keeps running.
28-Lead QFN (4mm × 5mm)
APPLICATIONS
n
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.
Automotive, Industrial, Telecom Systems
High Power Battery-Powered System
n
TYPICAL APPLICATION
98% Efficient 48W (12V 4A) Miniature Buck-Boost Voltage Regulator
V
OUT
12V
4A
120µF
16V
6uH
4mΩ
15mΩ
V
IN
4V TO 56V
22µF
63V
×2
10µF
25V
×2
4.7µF
100V
×2
0.1µF
0.1µF
120µF
16V
SW1 LSP
BST1
LSN
SW2
BST2
Efficiency vs VIN
BG1
BG2
100
98
96
94
92
90
88
86
GND
TG1
TG2
V
LT8390
V
OUT
IN
1µF
1µF
383k
EN/UVLO
LOADTG
TEST
ISP
ISN
FB
100k
165k
SSFM OFF
9.09k
ISMON
ISMON
CTRL
SYNC/SPRD
INTV
I
LIMIT 6.7A
OUT
SSFM ON
CC
4.7µF
I
= 4A
OUT
100k
LOADEN
V
PGOOD
PGOOD
0
10
20
30
40
50
60
REF
SS
V
C
RT
INPUT VOLTAGE (V)
0.47µF
8390 TA01a
8390 TA01b
100k
400kHz
0.1µF
100pF
27k
4.7nF
8390fa
1
For more information www.linear.com/LT8390