and RP ............................................................... (Note 2)
Operating Junction Temperature Range (Notes 3, 4)
LT3932E/LT3932I .............................. –40°C to 125°C
LT3932H ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
28 27 26 25 24 23
V
REF
SS
V
C
FB
ISP
ISN
ISMON
FAULT
1
2
3
4
5
6
7
8
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
JA
= 25°C/W (MEASURED ON DC2286A)
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3932EUFD#PBF
LT3932IUFD#PBF
LT3932HUFD#PBF
LT3932EUFD-1#PBF
LT3932IUFD-1#PBF
LT3932HUFD-1#PBF
TAPE AND REEL
LT3932EUFD#TRPBF
LT3932IUFD#TRPBF
LT3932HUFD#TRPBF
LT3932EUFD-1#TRPBF
LT3932IUFD-1#TRPBF
LT3932HUFD-1#TRPBF
http://www.linear.com/product/LT3932#orderinfo
PART MARKING*
3932
3932
3932
39321
39321
39321
PACKAGE DESCRIPTION
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Consult ADI 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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
EN/UVLO
= 5V unless otherwise noted.
PARAMETER
Input Voltage Range
V
IN
Pin Quiescent Current
EN/UVLO Threshold (Falling)
EN/UVLO Rising Hysteresis
EN/UVLO Pin Hysteresis Current
EN/UVLO = 2V, Not Switching
EN/UVLO = 300mV, Shutdown
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
3.6
TYP
2.2
MAX
36
2.7
2
1.21
UNITS
V
mA
µA
V
mV
µA
3932fa
1.09
1.15
20
4
2
For more information
www.linear.com/LT3932
LT3932/LT3932-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
EN/UVLO
= 5V unless otherwise noted.
PARAMETER
Reference
V
REF
Voltage
V
REF
Pin Current Limit
LED Current Regulation
CTRL-Off Threshold (Falling)
CTRL-Off Rising Hysteresis
CTRL Pin Current
Sense Voltage (V
ISP
−V
ISN
)
(Analog Input)
ISP Pin Current
ISN Pin Current
ISP/ISN Common Mode Range
Current Error Amplifier Transconductance
Duty Cycle Control of LED Current
Sense Voltage (V
ISP
−V
ISN
)
(Duty Cycle Input)
CTRL Pulse Input High (V
IH
)
CTRL Pulse Input Low (V
IL
)
CTRL Pulse Input Frequency Range
Voltage Regulation
FB Regulation Voltage
FB Pin Current
Voltage Error Amplifier Transconductance
Power Stage
Peak Current Limit
Minimum Off-Time
Minimum On-Time
Bottom Switch On-Resistance
Top Switch On-Resistance
Oscillator
Programmed Switching Frequency (f
SW
)
Spread Spectrum Frequency Range
RT Pin Current Limit
SYNC/SPRD Threshold (Rising)
SYNC/SPRD Falling Hysteresis
SYNC/SPRD Pin Current
Soft-Start
SS Pin Charging Current
V
SS
= 0V
20
µA
3932fa
ELECTRICAL CHARACTERISTICS
CONDITIONS
I
VREF
= 0µA
I
VREF
= 500µA
MIN
l
TYP
2
1.998
2
MAX
2.020
2.016
UNITS
V
V
mA
1.975
1.980
V
REF
= 1.9V, Current Out of Pin
l
200
−100
218
20
228
100
mV
mV
nA
mV
mV
mV
µA
µA
V
CTRL
= 2V
V
CTRL
= 1.5V (100%), V
IN
= 36V, V
ISP
= 24V
V
CTRL
= 750mV (50%), V
IN
= 36V, V
ISP
= 24V
V
CTRL
= 300mV (5%), V
IN
= 36V, V
ISP
= 24V
V
IN
= 36V, V
ISP
= 24V, V
CTRL
= 2V, Current Into Pin
V
IN
= 36V, V
ISN
= 23.9V, V
CTRL
= 2V, Current Into Pin
V
IN
= 36V (Note 5)
V
IN
= 36V, V
ISP
= 24V
CTRL Duty = 75% (100%), V
IN
= 36V, V
ISP
= 24V
CTRL Duty = 37.5% (50%), V
IN
= 36V, V
ISP
= 24V
CTRL Duty = 15% (5%), V
IN
= 36V, V
ISP
= 24V
l
l
l
98.5
48.5
4
100
50
5
50
50
101.5
51.5
6
0
200
99
49
4
1.6
100
50
5
36
V
µA/V
101
51
6
0.4
mV
mV
mV
V
V
kHz
V
nA
µA/V
100
V
ISP
= V
ISN
= 6V, V
CTRL
= 2V
V
FB
= 1V
l
1000
1.000
480
1.012
100
0.988
−100
3.0
(Note 6)
(Note 6)
3.6
55
55
90
90
4.2
A
ns
ns
m
m
R
T
= 45.3k, V
SYNC/SPRD
= 0V
R
T
= 523k, V
SYNC/SPRD
= 0V
R
T
= 45.3k, V
SYNC/SPRD
= 3.3V
R
T
= 523k, V
SYNC/SPRD
= 3.3V
V
RT
= 0V, Current Out of Pin
l
l
1900
180
1900
180
2000
200
2100
230
2650
290
kHz
kHz
kHz
kHz
µA
V
mV
nA
34
1.4
220
1.5
100
V
SYNC/SPRD
= 3.3V
−100
For more information
www.linear.com/LT3932
3
LT3932/LT3932-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
EN/UVLO
= 5V unless otherwise noted.
PARAMETER
SS Pin Discharging Current
SS Lower Threshold (Falling)
SS Higher Threshold (Rising)
Fault Detection
Open-Circuit Threshold (FB Rising)
Open-Circuit Falling Hysteresis
Short-Circuit Threshold (FB Falling)
Short-Circuit Rising Hysteresis
FAULT
Pull-Down Current
FAULT
Leakage Current
Overvoltage Protection
FB Overvoltage Threshold (FB Rising)
FB Overvoltage Falling Hysteresis
LED Current Monitor
ISMON Voltage
PWM Driver
PWMTG Gate Drive (V
OUT
– V
PWMTG
)
PWM Threshold (Rising)
PWM Falling Hysteresis
PWM Pin Current
PWM to PWMTG Propagation Delay
Turn-On
Turn-Off
Analog Control for PWM Dimming
PWM Voltage for 100% Dimming
PWM Voltage for 0% Dimming
PWM Dimming Accuracy
PWM Dimming Frequency
RP Pin Current Limit
R
P
= 28.7k, V
REF
= 2V
R
P
= 28.7k, V
REF
= 2V
R
P
= 28.7k, V
REF
= 2V, V
PWM
= 1.1V
R
P
= 28.7k, V
REF
= 2V, V
PWM
= 1.9V
R
P
= 28.7k, R
T
= 45.3k, V
SYNC/SPRD
= 0V
R
P
= 332k, R
T
= 45.3k, V
SYNC/SPRD
= 0V
R
P
= 0V, Current Out of Pin
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
V
SS
= 2V
MIN
TYP
1.25
200
1.7
MAX
UNITS
µA
mV
V
930
180
100
−100
950
55
200
50
970
220
mV
mV
mV
mV
µA
V
FAULT
= 200mV, V
FB
= 0V
V
FAULT
= 3.3V, V
FB
= 700mV
100
1.050
48
nA
V
mV
V
ISP
− V
ISN
= 100mV (100%), V
ISP
= 12V
V
ISP
− V
ISN
= 10mV (10%), V
ISP
= 12V
V
OUT
= 12V, V
PWM
= 2V
V
OUT
= 12V
V
OUT
= 12V
V
PWM
= 2V
C
PWMTG
= 2.2nF (Connected from V
OUT
to PWMTG),
V
OUT
= 12V
l
0.965
80
1.000
100
10
1.4
200
1.030
120
11
V
mV
V
V
mV
−100
100
100
2.00
100
nA
ns
ns
V
0.99
7.8
87
7.42
116
10
90
7.81
122
60
12.4
93
8.20
128
V
%
%
kHz
Hz
µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Do not apply a positive or negative voltage source to these pins,
otherwise permanent damage may occur.
Note 3:
The LT3932E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the −40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3932I is guaranteed to meet performance specifications over the
−40°C to 125°C operating junction temperature range. The LT3932H is
guaranteed over the −40°C to 150°C operating junction temperature range.
Operating lifetime is derated for junction temperatures greater than 125°C.
Note 4:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 5:
The current sense error amplifier is tested with V
ISP
= 36V, and
separately, with V
ISN
= 0V.
Note 6:
The MIN on and off times are guaranteed by design and are not
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
