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LT3791MPFE-1#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LT3791-1
1
37911fa
For more information www.linear.com/LT3791-1
Typical applicaTion
FeaTures DescripTion
60V 4-Switch Synchronous
Buck-Boost Controller
The LT
®
3791-1 is a synchronous 4-switch buck-boost volt-
age/current regulator
controller. The controller 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 LT3791-1 is ideal for voltage regulator, bat
-
tery/super-capacitor charger applications in automotive,
industrial, telecom, and even battery-powered systems.
The LT3791-1 provides input current monitor, output
current monitor, and various status flags, such as C/10
charge termination and shorted output flag.
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
120W (24V 5A) Buck-Boost Voltage Regulator
applicaTions
n
4-Switch Single Inductor Architecture Allows V
IN
Above, Below or Equal to V
OUT
n
Synchronous Switching: Up to 98.5% Efficiency
n
Wide V
IN
Range: 4.7V to 60V
n
2% Output Voltage Accuracy: 1.2V ≤ V
OUT
< 60V
n
6% Output Current Accuracy: 0V ≤ V
OUT
< 60V
n
Input and Output Current Regulation with Current
Monitor Outputs
n
No Top FET Refresh in Buck or Boost
n
V
OUT
Disconnected from V
IN
During Shutdown
n
C/10 Charge Termination and Output Shorted Flags
n
Capable of 100W or greater per IC
n
38-Lead TSSOP with Exposed Pad
Efficiency vs Load Current
n
Automotive, Telecom, Industrial Systems
n
High Power Battery-Powered System
LOAD CURRENT (A)
0 1
EFFICIENCY (%)
90
95
100
37911 TA01b
80
70
60
85
75
65
2 3 4
5
V
IN
= 12V
V
IN
= 24V
V
IN
= 54V
V
IN
12V TO
58V
INTV
CC
TG1
BG1
SNSP
SNSN
BST1
BST2
BG2
PGND
SW2
TG2
RT
LT3791-1
SWI
SHORT
C/10
CCM
470nF
IVINN
V
IN
IVINP
IVINMON
ISMON
CLKOUT
PWMOUT
TEST1
EN/UVLO
OVLO
V
REF
PWM
CTRL
147k
200kHz
V
C
SYNCSS SGND
1µF
499k
56.2k
100k
499k
27.4k
INTV
CC
0.1µF
33nF
10nF
37911 TA01a
0.004Ω
ISP
ISN
FB
0.1µF
10µH
0.1µF
4.7µF
4.7µF
50V
×2
4.7µF
100V
47µF
80V
0.015Ω
V
OUT
24V
5A
73.2k
3.83k
5.1k
+
220µF
35V
+
100k 200k
0.003Ω
50Ω
LT3791-1
2
37911fa
For more information www.linear.com/LT3791-1
pin conFiguraTionabsoluTe MaxiMuM raTings
Supply Voltages
Input Supply (V
IN
) ..................................................... 60V
SW1, SW2 ...................................................... –1V to 60V
C/10, SHORT .............................................................15V
EN/UVLO, IVINP, IVINN, ISP, ISN ..............................60V
INTV
CC
, (BST1-SW1), (BST2-SW2) ............................. 6V
CCM, SYNC, RT, CTRL, OVLO, PWM ..........................6V
IVINMON, ISMON, FB, SS, VC, V
REF
...........................6V
IVINP-IVINN, ISP-ISN, SNSP-SNSN .......................±0.5V
SNSP, SNSN ........................................................... ±0.3V
Operating Junction Temperature (Notes 2, 3)
LT3791E-
1/LT3791I-1 ......................... –40°C to 125°C
LT3791H-
1 ......................................... –40°C to 150°C
LT3791MP-1....................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...................300°C
(Note 1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
TOP VIEW
FE PACKAGE
38-LEAD PLASTIC TSSOP
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
CTRL
SS
PWM
C/10
SHORT
V
REF
ISMON
IVINMON
EN/UVLO
IVINP
IVINN
V
IN
INTV
CC
TG1
BST1
SW1
PGND
BG1
BG2
OVLO
FB
V
C
RT
SYNC
CLKOUT
CCM
PWMOUT
SGND
TEST1
SNSN
SNSP
ISN
ISP
TG2
NC
BST2
SW2
PGND
39
SGND
T
JMAX
= 150°C, θ
JA
= 28°C/W
EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, V
EN/UVLO
= 12V unless otherwise noted.
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3791EFE-1#PBF LT3791EFE-1#TRPBF LT3791FE-1 38-Lead Plastic TSSOP –40°C to 125°C
LT3791IFE-1#PBF LT3791IFE-1#TRPBF LT3791FE-1 38-Lead Plastic TSSOP –40°C to 125°C
LT3791HFE-1#PBF LT3791HFE-1#TRPBF LT3791FE-1 38-Lead Plastic TSSOP –40°C to 150°C
LT3791MPFE-1#PBF LT3791MPFE-1#TRPBF LT3791FE-1 38-Lead Plastic TSSOP –55°C to 150°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input
V
IN
Operating Voltage 4.7 60 V
V
IN
Shutdown I
Q
V
EN/UVLO
= 0V 0.1 1 µA
V
IN
Operating I
Q
(Not Switching) FB = 1.3V, R
T
= 59.0k 3.0 4 mA
LT3791-1
3
37911fa
For more information www.linear.com/LT3791-1
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, V
EN/UVLO
= 12V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Logic Inputs
EN/UVLO Falling Threshold
l
1.16 1.2 1.24 V
EN/UVLO Rising Hysteresis 15 mV
EN/UVLO Input Low Voltage I
VIN
Drops Below 1µA 0.3 V
EN/UVLO Pin Bias Current Low V
EN/UVLO
= 1V 2 3 4 µA
EN/UVLO Pin Bias Current High V
EN/UVLO
= 1.6V 10 100 nA
CCM Threshold Voltage 0.3 1.5 V
CTRL Input Bias Current V
CTRL
= 1V 20 50 nA
CTRL Latch-Off Threshold 175 mV
OVLO Rising Shutdown Voltage
l
2.85 3 3.15 V
OVLO Falling Hysteresis 75 mV
Regulation
V
REF
Voltage
l
1.96 2.00 2.04 V
V
REF
Line Regulation 4.7V < V
IN
< 60V 0.002 0.04 %/V
V
(ISP-ISN)
Threshold V
CTRL
= 2V
l
97.5
94
100
100
102.5
106
mV
mV
V
CTRL
= 1100mV
l
87
84
90
90
93
96
mV
mV
V
CTRL
= 700mV
l
47.5
46
50
50
52.5
54
mV
mV
V
CTRL
= 300mV
l
6.5
5
10
10
13.5
15
mV
mV
ISP Bias Current 110 µA
ISN Bias Current 20 µA
Output Current Sense Common Mode Range 0 60 V
Output Current Sense Amplifier g
m
890 µS
ISMON Monitor Voltage V
(ISP-ISN)
= 100mV
l
0.96 1 1.04 V
Input Current Sense Threshold V
(IVINP-IVINN)
3V ≤ V
IVINP
≤ 60V
l
46.5 50 54 mV
IVINP Bias Current 90 µA
IVINN Bias Current 20 µA
Input Current Sense Common Mode Range 3 60 V
Input Current Sense Amplifier g
m
2.12 mS
IVINMON Monitor Voltage V
(IVINP-IVINN)
= 50mV
l
0.96 1 1.04 V
FB Regulation Voltage
l
1.194
1.176
1.2
1.2
1.206
1.220
V
V
FB Line Regulation 4.7V < V
IN
< 60V 0.002 0.025 %/V
FB Amplifier g
m
565 µS
FB Pin Input Bias Current FB in Regulation 100 150 nA
V
C
Standby Input Bias Current PWM = 0V –20 20 nA
V
SENSE(MAX)
(V
SNSP-SNSN
) Boost
Buck
l
l
42
–56
51
–47.5
60
–39
mV
mV
Fault
SS Pull-Up Current V
SS
= 0V 14 µA
SS Discharge Current 1.4 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LT3791MPFE-1#PBF

Mfr. #:
Buy LT3791MPFE-1#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 60V 4-Switch Sync Buck-Boost Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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