LT3790_15 Datasheet, PDF (1/28 Pages) Linear Technology – 60V Synchronous 4-Switch Buck-Boost Controller

LT3790
60V Synchronous 4-Switch
Buck-Boost Controller
Features
n _{4-Switch Single Inductor Architecture Allows VIN}
Above, Below or Equal to V_OUT
n _{Synchronous Switching: Up to 98.5% Efficiency}
n _{Wide VIN Range: 4.7V to 60V}
n _{2% Output Voltage Accuracy: 1.2V ≤ VOUT < 60V}
n _{6% Output Current Accuracy: 0V ≤ VOUT < 60V}
n _{Input and Output Current Regulation with Current}
Monitor Outputs
n _{No Top FET Refresh in Buck or Boost}
n _{VOUT Disconnected from VIN During Shutdown}
n _{C/10 Charge Termination and Output Shorted Flags}
n _{Capable of 100W or greater per IC}
n _{Easy Parallel Capability to Extend Output Power}
n _{38-Lead TSSOP with Exposed Pad}
Applications
n _{Automotive, Telecom, Industrial Systems}
n _{High Power Battery-Powered System}
Description
The LT^®3790 is a synchronous 4-switch buck-boost volt-
age/current regulator controller. The LT3790 can regulate
output voltage, output current, or input current with input
voltages above, below, or equal to the output voltage. The
constant-frequency, current mode architecture allows its
frequency to be adjusted or synchronized from 200kHz
to 700kHz. No top FET refresh switching cycle is needed
in buck or boost operation. With 60V input, 60V output
capability and seamless transitions between operating
regions, the LT3790 is ideal for voltage regulator, bat-
tery/super-capacitor charger applications in automotive,
industrial, telecom, and even battery-powered systems.
The LT3790 provides input current monitor, output current
monitor, and various status flags, such as C/10 charge
termination and shorted output flag.
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
V_IN
12V TO
58V
0.003Ω
1µF
51Ω
470nF
499k
499k
56.2k
27.4k ^INTVCC
100k
200k
0.1µF
100k
120W (24V 5A) Buck-Boost Voltage Regulator
V_IN
INTV_CC
IVINN
IVINP
BST2
BST1
TG1
EN/UVLO
SWI
OVLO
BG1
LT3790
SNSP
SHORT
C/10
CCM
IVINMON
ISMON
CLKOUT
PWMOUT
V_REF
PWM
CTRL _{SS SYNC VC}
SNSN
PGND
BG2
SW2
TG2
ISP
ISN
RT SGND ^FB
33nF
5.1k 147k
200kHz
10nF
0.1µF
0.1µF
10µH
4.7µF
0.004Ω
4.7µF ⁺ 47µF
100V
80V
+ _220µF
35V
0.009Ω
4.7µF
50V
×2
3790 TA01a
V_OUT
24V
5A
73.2k
3.83k
For more information www.linear.com/LT3790
Efficiency vs Load Current
100
95
90
85
80
75
70
V_IN = 12V
65
V_IN = 24V
V_IN = 54V
60
0
1
2
3
4
5
LOAD CURRENT (A)
3790 TA01b
3790f
1