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LTC3779HFE#TRPBF

Description
IC REG CTRLR BUCK-BOOST 38-TSSOP
Categorysemiconductor    Power management   
File Size3MB,38 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC3779HFE#TRPBF Overview

IC REG CTRLR BUCK-BOOST 38-TSSOP

LTC3779HFE#TRPBF Parametric

Parameter NameAttribute value
Output typetransistor driver
FunctionBoost, step down
Output configurationjust
Topologystep down, step up
Number of outputs1
output stage1
Voltage - Power Supply (Vcc/Vdd)4.5 V ~ 150 V
Frequency - Switch50kHz ~ 600kHz
Duty cycle (maximum)0.9
Synchronous rectifieryes
Clock synchronizationnone
serial interface-
Control characteristicsCurrent limiting, power good, soft start
Operating temperature-40°C ~ 150°C(TJ)
Package/casing38-TFSOP (0.173", 4.40mm wide) 31-lead, exposed pad
Supplier device packaging38-TSSOP
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
LTC3779
150V V
IN
and V
OUT
Synchronous
4-Switch Buck-Boost Controller
DESCRIPTION
The
LTC
®
3779
is a high performance buck-boost switching
regulator controller that operates from input voltages
above, below or equal to the output voltage. The constant
frequency current mode architecture allows a phase-
lockable frequency of up to 600kHz, while an input/
output constant-current loop provides support for battery
charging.
With a wide 4.5V to 150V input and output range and
seamless transfers between operating regions, the
LTC3779 is ideal for automotive, telecom and battery-
powered systems.
The LTC3779 features a precision 1.2V reference and
power good output indicator. The MODE pin can select
between pulse-skipping mode or forced continuous mode
of operation. Pulse-skipping mode offers high efficiency
at light load while forced continuous mode operates at
a constant frequency for noise sensitive applications.
The PLLIN pin allows the IC to be synchronized to an
external clock. The SS pin ramps the output voltage
during start-up. Current foldback limits MOSFET heat
dissipation during short-circuit conditions.
All registered trademarks and trademarks are the property of their respective owners.
4-Switch Current Mode Single Inductor Architecture
Allows V
IN
Above, Below or Equal to V
OUT
Wide V
IN
Range: 4.5V to 150V
Wide Output Voltage Range: 1.2V ≤ V
OUT
≤ 150V
Synchronous Rectification: Up to 99% Efficiency
±1% 1.2V Voltage Reference
Input or Output Average Current Limit
Onboard LDO or External NMOS LDO for DRV
CC
36V EXTV
CC
LDO Powers Drivers
Programmable 6V to 10V DRV
CC
Optimizes Efficiency
No Top FET Refresh Noise in Boost or Buck Mode
V
OUT
Disconnected from V
IN
During Shutdown
Phase-Lockable Fixed Frequency (50kHz to 600kHz)
No Reverse Current During Start-Up
Power Good Output Voltage Monitor
150V Rated RUN Pin with Accurate Turn-On Threshold
Programmable Input Overvoltage Lockout
Thermally Enhanced FE38 TSSOP Package Modified
for High Voltage Operation
Industrial, Automotive, Medical, Military, Avionics
APPLICATIONS
n
TYPICAL APPLICATION
V
IN
20V TO 120V
20µF
5µF
1k
5Ω
0.1µF
10k
133k
1.21k
NDRV
DRV
CC
10µF
LTC3779
30µF
V
INSNS
V
IN
SW1
TG1
RUN
V
INOV
SENSEP
BG1
BOOST1
0.22µF
15µH
4mΩ
V
OUT
48V
10A
56µF
Efficiency and Power Loss
vs Input Voltage
100
30
98
EFFICIENCY (%)
100
220pF
4m
475k
EFFICIENCY
24
POWER LOSS (W)
96
18
SENSEN
SGND
PGND
BG2
100
94
12
V5
2.2µF
0.1µF
56.2k
SS
FREQ
BOOST2
0.22µF
SW2
TG2
I
AVGSNSP
100
4.7µF
I
AVGSNSN
V
OUTSNS
V
FB
12.1k
1k
100
92
V
OUT
= 48V
I
OUT
= 10A
0
POWER LOSS
6
90
0
12 24 36 48 60 72 84 96 108 120
VIN VOLTAGE (V)
3779 TA01b
I
TH
100pF
10k
10nF
3779 TA01a
Rev A
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Output type transistor driver transistor driver transistor driver transistor driver transistor driver transistor driver
Function Boost, step down Boost, step down Boost, step down Boost, step down Boost, step down Boost, step down
Output configuration just just just just just just
Topology step down, step up step down, step up step down, step up step down, step up step down, step up step down, step up
Number of outputs 1 1 1 1 1 1
output stage 1 1 1 1 1 1
Voltage - Power Supply (Vcc/Vdd) 4.5 V ~ 150 V 4.5 V ~ 150 V 4.5 V ~ 150 V 4.5 V ~ 150 V 4.5 V ~ 150 V 4.5 V ~ 150 V
Frequency - Switch 50kHz ~ 600kHz 50kHz ~ 600kHz 50kHz ~ 600kHz 50kHz ~ 600kHz 50kHz ~ 600kHz 50kHz ~ 600kHz
Duty cycle (maximum) 0.9 0.9 0.9 0.9 0.9 0.9
Synchronous rectifier yes yes yes yes yes yes
Clock synchronization none none none none none none
Control characteristics Current limiting, power good, soft start Current limiting, power good, soft start Current limiting, power good, soft start Current limiting, power good, soft start Current limiting, power good, soft start Current limiting, power good, soft start
Operating temperature -40°C ~ 150°C(TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 150°C(TJ)
Package/casing 38-TFSOP (0.173", 4.40mm wide) 31-lead, exposed pad 38-TFSOP (0.173", 4.40mm wide) 31-lead, exposed pad 38-TFSOP (0.173", 4.40mm wide) 31-lead, exposed pad 38-TFSOP (0.173", 4.40mm wide) 31-lead, exposed pad 38-TFSOP (0.173", 4.40mm wide) 31-lead, exposed pad 38-TFSOP (0.173", 4.40mm wide) 31-lead, exposed pad
Supplier device packaging 38-TSSOP 38-TSSOP 38-TSSOP 38-TSSOP 38-TSSOP 38-TSSOP
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