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LT3840 の電気的特性と機能

LT3840のメーカーはLinear Technologyです、この部品の機能は「Wide Input Range Synchronous Regulator Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 LT3840
部品説明 Wide Input Range Synchronous Regulator Controller
メーカ Linear Technology
ロゴ Linear Technology ロゴ 




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LT3840 Datasheet, LT3840 PDF,ピン配置, 機能
Features
LT3840
Wide Input Range
Synchronous Regulator Controller
with Accurate Current Limit
Description
n Wide Input Range: 2.5V to 60V
n Integrated Buck-Boost Supply for 7.5V MOSFET
Gate Drive
n Programmable Constant-Current Operation with
Current Monitor Output
n Low IQ: 75µA, 12VIN to 3.3VOUT
n Selectable Low Output Ripple Burst Mode®
Operation
n VOUT Up to 60V
n Adjustable and Synchronizable: 50kHz to 1MHz
n Internal OVLO Protects for Input Transients Up to 80V
n Accurate Input Overvoltage and Undervoltage Threshold
n Programmable Soft-Start with Voltage Tracking
n Power Good and Output OVP
n 28-Lead TSSOP and 38-Lead 4mm × 6mm QFN Packages
Applications
n Automotive Supplies
n Industrial Systems
n Distributed DC Power Systems
The LT®3840 is a high voltage synchronous step-down
switching regulator controller capable of operating from
a 2.5V to 60V supply.
The LT3840’s low quiescent current, when configured for
user selectable Burst Mode operation, helps extend run
time in battery-powered systems by increasing efficiency
at light loads. The LT3840 uses a constant frequency,
current mode architecture. High current applications are
possible with large N-channel gate drivers capable of
driving multiple low RDS(ON) MOSFETs.
An integrated buck-boost switching regulator generates
a 7.5V bias supply voltage for MOSFET gate drive and IC
power allowing higher efficiency operation over the entire
input voltage range and eliminating the need for an external
bias voltage. An accurate current limit set point regulates
the maximum output current. A current monitor reports
the average output current.
L, LT, LTC, LTM, Linear Technology, Burst Mode, and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Typical Application
VIN
4V TO 60V
High Efficiency Synchronous Step-Down Converter
68µF 1µF 33µH
×2
49.9k
AUXBST AUXSW1
EN
VIN
AUXVIN
UVLO
LT3840
AUXSW2
INTVCC
BOOST
OVLO
TG
PG SW
SYNC
BG
20k
1500pF
MODE
RT SENSE+
VC SENSE
TK/SS
FB
100pF
IMON
ICOMP
GND
ICTRL
2200pF
7.68k
470pF
4.7µF
1µF
1.5µH
16.9k
10k
2m
VOUT
3.3V
20A
330µF
×2
3840 TA01a
12VIN to 3.3VOUT Efficiency
100
95
90
85
80
75
70
65
60
55
50
0
5 10 15
LOAD CURRENT (A)
20
3840 TA01b
For more information www.linear.com/LT3840
3840fa
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LT3840 pdf, ピン配列
LT3840
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN TYP MAX
Input Supply
VVIINN
Minimum Operating
Supply Current
Voltage
VIN Burst Mode Current
VIN Shutdown Current
AUXVIN Minimum Operating Voltage
AUXVIN Overvoltage Lockout
AAUUXXVVIINN
Supply Current
Burst Mode Current
AUXVIN Shutdown Current
EN Enable Threshold (Rising)
EN Hysteresis
EN Pin Bias Current
UVLO Enable Threshold (Rising)
UVLO Hysteresis
UVLO Pin Bias Current
OVLO Threshold (Rising)
OVLO Hysteresis
OVLO Pin Bias Current
Voltage Regulation
VMODE = 0V
VEN = 0.3V
(Note 3)
VMODE = 0V
VEN = 0.3V
VEN = 1.25V
VUVLO = 1.25V
VOVLO = 1.25V
l 2.5
20
20 30
l 0.1 1
l 2.5
l 60
300
0.1
0.1 1
l 1.20 1.25 1.30
30
2
l 1.20 1.25 1.30
45
1
l 1.20 1.25 1.30
125
1
Regulated FB Voltage
E- and I-Grade
l 1.237 1.250 1.263
Regulated FB Voltage
MP- and H-Grade
l 1.232 1.250 1.263
FB Overvoltage Protection
% Above FB Voltage
l8
12 16
FB Overvoltage Protection Hysteresis
2.5
FB Input Bias Current
5 20
FB Voltage Line Regulation
FB Error Amp Transconductance
2.5V ≤ VIN ≤ 60V
0.002
300
0.02
FB Error Amp Sink/Source Current
±25
Peak Current Limit Sense Voltage
0% Duty Cycle
80 95 110
Peak Current Limit Sense Voltage
100% Duty Cycle
60
TK/SS Charge Current
9
Current Regulation
Sense Common Mode Range
l0
60
Average Current Limit Sense Voltage
IMON Voltage
ICTRL Current
Reverse Protect Sense Voltage
Reverse Current Sense Voltage Offset
Sense Input Current
VICTRL = Open
VICTRL = 800mV
VSENSE = 50mV
VSENSE = 20mV
VICTRL = 1V
VMODE = 7.5V
VMODE = VFB or VMODE = 0V
SENSE+ = SENSE= 12V
l 47.5 50 52.5
40
l 0.95 1.00 1.05
0.4
7
–50
5
300
Oscillator
Switching Frequency
SYNC Threshold
RRTT
=
=
49.9k
348k
RT = 13.7k
l 280 300 320
50
1000
1.2
UNITS
V
µA
µA
µA
V
V
µA
µA
µA
V
mV
nA
V
mV
nA
V
mV
nA
V
V
%
%
nA
%/V
µS
µA
mV
mV
µA
V
mV
mV
V
V
µA
mV
mV
µA
kHz
kHz
kHz
V
For more information www.linear.com/LT3840
3840fa
3


3Pages


LT3840 電子部品, 半導体
LT3840
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Enable Pin Current vs Enable
Voltage
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
10 20 30 40 50 60
ENABLE PIN VOLTAGE (V)
3840 G10
UVLO Pin Current vs UVLO
Voltage
5
4
3
2
1
0
0 10 20 30 40 50 60
UVLO PIN VOLTAGE (V)
3840 G11
Average Current Sense Voltage vs
Temperature
55
50 ICTRL = FLOAT
45
40
35
30
ICTRL = 500mV
25
20
15
10
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3840 G12
Current Monitor (IMON) Voltage
vs Temperature
1.1
1.0 VSENSE = 50mV
0.9
0.8
0.7
0.6
0.5 VSENSE = 25mV
0.4
0.3
0.2
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3840 G13
Power Good Threshold vs
Temperature
1.4
1.3
1.2
PG RISING
1.1
PG FALLING
1.0
0.9
0.8
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3840 G14
FB Overvoltage Threshold vs
Temperature
1.6
1.5
FB RISING
1.4
FB FALLING
1.3
1.2
1.1
1.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3840 G15
3840fa
6 For more information www.linear.com/LT3840

6 Page



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共有リンク

Link :


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Wide Input Range Synchronous Regulator Controller

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