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PDF LT3790 Data sheet ( Hoja de datos )
| Número de pieza | LT3790 | |
| Descripción | 60V Synchronous 4-Switch Buck-Boost Controller | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT3790 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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Features
n 4-Switch Single Inductor Architecture Allows VIN
Above, Below or Equal to VOUT
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
LT3790
60V Synchronous 4-Switch
Buck-Boost Controller
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
VIN
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
VIN INTVCC
IVINN
IVINP
BST2
BST1
EN/UVLO
OVLO
TG1
SWI
BG1
LT3790
SNSP
SHORT
C/10
CCM
IVINMON
ISMON
CLKOUT
PWMOUT
VREF
PWM
CTRL SS SYNC VC
SNSN
PGND
BG2
SW2
TG2
ISP
ISN
RT SGND FB
33nF
10nF
5.1k 147k
200kHz
0.1µF
0.1µF
10µH
4.7µF
0.004Ω
4.7µF +
100V
47µF
80V
+ 220µF
35V
0.009Ω
4.7µF
50V
×2
3790 TA01a
VOUT
24V
5A
73.2k
3.83k
For more information www.linear.com/LT3790
Efficiency vs Load Current
100
95
90
85
80
75
70
65
VIN = 12V
VIN = 24V
60 VIN = 54V
012345
LOAD CURRENT (A)
3790 TA01b
3790f
1
1 page  
LT3790
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
vINsTCVuCrCreDnrto,pToeumt pVeorlatatugree
2.5
TA = 150°C
TA = 25°C
2.0 TA = –50°C
1.5
1.0
0.5
0
0 10 20 30 40
LDO CURRENT (mA)
3790 G01
INTVCC Load Regulation
6.00
5.75
5.50
5.25
5.00
4.75
4.50
4.25
4.00
0 10 20 30 40 50 60 70
ILOAD (mA)
3790 G04
V(ISP-ISN) Threshold vs VCTRL
70
60
50
40
30
20
10 RISING
FALLING
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
VCTRL (V)
3790 G07
INTVCC Voltage vs Temperature
5.20
5.15
5.10
5.05 VIN = 60V
5.00
VIN = 12V
4.95
4.90
4.85
4.80
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3790 G02
VREF Voltage vs Temperature
2.04
2.03
2.02
2.01
2.00
1.99
1.98
1.97
1.96
–50 –25
VIN = 60V
VIN = 12V
VIN = 4.7V
0 25 50 75 100 125 150
TEMPERATURE (°C)
3790 G05
V(ISP-ISN) Threshold vs VISP
70
68
66
64
62
60
58
56
54
52
50
0
10 20 30 40 50 60
VISP (V)
3790 G08
vINsTTVeCmCpCeurrarteunrteLimit
90
80
70
60
50
40
30
20
10
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3790 G03
VREF Load Regulation
2.20
2.15
2.10
2.05
2.00
1.95
1.90
1.85
1.80
0
50 100 150 200 250 300 350 400
IREF (µA)
3790 G06
V(ISP-ISN) Threshold
vs Temperature
70
68
VIN = 12V
VCTRL = 2V
66
64
62
60
58
56
54
52
50
–50 –25
VISP = 60V
VISP = 12V
VISP = 0V
0 25 50 75 100 125 150
TEMPERATURE (°C)
3790 G09
For more information www.linear.com/LT3790
3790f
5
5 Page 
Block Diagram
25 26
ISP ISN
10 11
IVINP IVINN
7 ISMON
8 IVINMON
9 EN/UVLO
A = 20
A2 A1
A = 20 A = 20
A = 24
SHDN_INT
ISMON_INT
IVINMON_INT
3µA
1.2V
–
A4
+
SHDN_INT
12
VIN
REGS
TSD
32 CCM
35 RT
34 SYNC
33 CLKOUT
OSC SLOPE_COMP_BOOST
SLOPE_COMP_BUCK
5 SHORT
4 C/10
INTVCC
3 PWM
A17
PWMOUT
31
+
A5
–
0.4V
FB
+
A6
–
R SS RESET
Q B S SS LATCH
5mV
V(ISP-ISN)
SGND
30, 39
+
A8
–
0.2V
+
A9
–
1.75V
1.4µA
6 13
VREF INTVCC
LT3790
+
A3
–
+
A7
–
VREF
14µA
BST1 15
A13 TG1 14
SW1 16
SHDN_INT
SS_RESET
SS LATCH
PWM
BUCK
LOGIC
INTVCC
A14 BG1 18
PGND 17
A15 BG2 19
BOOST
LOGIC
INTVCC
+
A10
–
SW2 21
A16 TG2 24
BST2 22
SNSP 27
SNSN 28
–
A11 –
+
+
A12 +
–
IVINMON_INT
FB 37
1.2V
CTRL 1
ISMON_INT
SS
2
VC
36
+
A18
–
3V
OVLO 38
3790 BD
For more information www.linear.com/LT3790
3790f
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LT3790.PDF ] | |
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