EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 38°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3783EDHD#PBF
LTC3783IDHD#PBF
LTC3783EFE#PBF
LTC3783IFE#PBF
LEAD BASED FINISH
LTC3783EDHD
LTC3783IDHD
LTC3783EFE
LTC3783IFE
TAPE AND REEL
LTC3783EDHD#TRPBF
LTC3783IDHD#TRPBF
LTC3783EFE#TRPBF
LTC3783IFE#TRPBF
TAPE AND REEL
LTC3783EDHD#TR
LTC3783IDHD#TR
LTC3783EFE#TR
LTC3783IFE#TR
PART MARKING*
3783
3783
3783EFE
3783IFE
PART MARKING*
3783
3783
3783IFE
3783IFE
PACKAGE DESCRIPTION
16-Lead (5mm
×
4mm) Plastic DFN
16-Lead (5mm
×
4mm) Plastic DFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
PACKAGE DESCRIPTION
16-Lead (5mm
×
4mm) Plastic DFN
16-Lead (5mm
×
4mm) Plastic DFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
Consult LTC 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/
3783fb
2
LTC3783
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
I
Q
V
RUN+
V
RUN–
V
RUN(HYST)
I
RUN
V
SENSE(MAX)
I
SENSE(ON)
I
SENSE(OFF)
I
SS
V
REF
I
REF
∆V
REF
/∆V
IN
∆V
REF
/∆I
REF
T
MAX
T
HYST
Error Amplifier
I
OV/FB
∆V
OV/FB(OV)
V
OV/FB(FB)
I
FBP
, I
FBN
V
FBP
– V
FBN
g
m
A
VOL
Oscillator
f
OSC
D
MAX
f
SYNC
/f
OSC
t
SYNC(MIN)
t
SYNC(MAX)
V
IH(SYNC)
V
HYST(SYNC)
Oscillator Frequency
Oscillator Frequency Range
Maximum Duty Cycle
Recommended Max SYNC Freq Ratio
SYNC Minimum Input Pulse Width
SYNC Maximum Input Pulse Width
SYNC Input Voltage High Level
SYNC Input Voltage Hysteresis
f
OSC
= 300kHz (Note 6)
V
SYNC
= 0V to 5V
V
SYNC
= 0V to 5V
1.2
0.5
R
FREQ
= 20kΩ
250
20
85
300
90
1.25
25
0.8/f
OSC
350
1000
97
1.3
ns
ns
V
V
3783fb
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are T
A
= 25°C. V
IN
= 12V V
RUN
= 1.5V V
SYNC
= 0V V
FBP
= V
REF
, R
T
= 20k, unless otherwise specified.
,
,
,
PARAMETER
Input Voltage Range
Input Voltage Supply Current
Continuous Mode
Shutdown Mode
Rising RUN Input Threshold Voltage
Falling RUN Input Threshold Voltage
RUN Pin Input Threshold Hysteresis
RUN Pin Input Current
Maximum Current Sense Threshold
SENSE Pin Current (GATE High)
SENSE Pin Current (GATE Low)
Soft-Start Pin Output Current
Reference Voltage
l
CONDITIONS
MIN
3
TYP
MAX
36
UNITS
V
mA
µA
V
Main Control Loop/Whole System
(Note 4)
V
OV/FB
= 1.5V, V
ITH
= 0.75V
V
RUN
= 0V
1.223
1.5
20
1.348
1.248
100
5
125
150
70
0.2
-50
1.218
1.212
0.5
1.230
1.242
1.248
0.02
1.0
180
1.273
V
mV
nA
mV
µA
µA
µA
V
V
mA
%/V
%/mA
°C
°C
V
SENSE
= 0V
V
SENSE
= 36V
V
SS
= 0V
Voltage/Temperature Reference
Max Reference Pin Output Current
Reference Voltage Line Regulation
Reference Voltage Load Regulation
Overtemperature SD Threshold Rising
Overtemperature Hysteresis
OV/FB Pin Input Current
OV/FB Overvoltage Lockout Threshold V
OV/FB(OV)
– V
OV/FB(NOM)
in %, V
FBP
≤ V
REF
OV/FB Pin Regulation Voltage
Error Amplifier Input Current
Error Amplifier Offset Voltage
(Note 5)
Error Amplifier Transconductance
Error Amplifier Open-Loop Gain
2.5V < V
FBP
< 36V
0V ≤ V
FBP
≤ V
REF
2.5V < V
FBP
< 36V
0V ≤ V
FBP
≤ V
REF
2.5V < V
FBP
≤ 36V (V
ILIM
= V
REF
)
2.5V < V
FBP
≤ 36V (V
ILIM
= 0.123V)
V
FBP
≤ V
REF
2.5V < V
FBP
< 36V
3V ≤ V
IN
≤ 36V
0mA ≤ I
REF
≤ 0.5mA
0.002
0.2
165
25
18
7
1.212
1.230
–0.4
50
–3
100
10
1.7
14
500
60
1.248
nA
%
V
µA
µA
3
mV
mV
mV
mmho
mmho
V/V
kHz
kHz
%
3
LTC3783
ELECTRICAL CHARACTERISTICS
SYMBOL
R
SYNC
t
ON(MIN)
PARAMETER
SYNC Input Pull-Down Resistance
Minimum On-Time
With Sense Resistor, 10mV Overdrive
No R
SENSE
Mode
V
OV/FB
= 1.5V
Rising INTV
CC
Falling INTV
CC
Hysteresis
12V ≤ V
IN
≤ 36V
0 ≤ I
INTVCC
≤ 10mA
V
IN
= 7V, I
INTVCC
= 10mA
V
SENSE
= 0V
V
SENSE
= 7V
C
L
= 3300pF (Note 7)
C
L
= 3300pF (Note 7)
V
GATE
= 0V
V
GATE
= 7V
Rising PWMIN
Falling PWMIN
Hysteresis
C
L
= 3300pF (Note 7)
C
L
= 3300pF (Note 7)
V
PWMOUT
= 0V
V
PWMOUT
= 7V
–1
l
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are T
A
= 25°C. V
IN
= 12V V
RUN
= 1.5V V
SYNC
= 0V V
FBP
= V
REF
, R
T
= 20k, unless otherwise specified.
,
,
,
CONDITIONS
MIN
TYP
100
170
300
6.5
1.8
7
2.3
2.1
0.2
2
–0.1
300
25
15
15
8
0.5
1
1.6
0.8
0.8
100
30
16
0.25
0.50
500
7.5
2.5
MAX
UNITS
kΩ
ns
ns
V
V
V
V
mV/V
%
mV
µA
µA
ns
ns
A
A
V
V
V
kΩ
ns
ns
A
A
Low Dropout Regulator
V
INTVCC
UVLO
INTV
CC
Regulator Output Voltage
INTV
CC
Undervoltage Lockout
Thresholds
INTV
CC
Line Regulation
INTV
CC
Load Regulation
INTV
CC
Dropout Voltage
Bootstrap Mode INTV
CC
Supply
Current in Shutdown
GATE Driver Output Rise Time
GATE Driver Output Fall Time
GATE Driver Peak Current Sourcing
GATE Driver Peak Current Sinking
PWMIN Pin Input Threshold Voltages
∆V
INTVCC
∆V
IN
∆V
LDO(LOAD)
V
DROPOUT
I
INTVCC(SD)
6
GATE/PWMOUT Drivers
t
r(GATE)
t
f(GATE)
I
PK(GATE,RISE)
I
PK(GATE,FALL)
V
PWMIN
R
PWMIN
t
r(PWMOUT)
t
f(PWMOUT)
I
PK(PWMOUT,RISE)
I
PK(PWMOUT,FALL)
PWMIN Input Pull-Up Resistance
PWMOUT Driver Output Rise Time
PWMOUT Driver Output Fall Time
PWMOUT Driver Peak Current Sourcing
PWMOUT Driver Peak Current Sinking
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:
The LTC3783E is guaranteed to meet performance specifications
over the 0°C to 85°C operating temperature range. Specifications over
the –40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3783I is guaranteed to meet performance specifications over the full
–40°C to 125°C operating temperature range.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• 43°C/W) for the DFN
T
J
= T
A
+ (P
D
• 38°C/W) for the TSSOP
Note 4:
The dynamic input supply current is higher due to power MOSFET
gate charging (Q
G
• f
OSC
). See Operation section.
Note 5:
The LTC3783 is tested in a feedback loop which servos V
FBN
to
V
FBP
= V
VREF
with the I
TH
pin forced to the midpoint of its voltage range
(0.3V ≤ V
ITH
≤ 1.2V; midpoint = 0.75V).
Note 6:
In a synchronized application, the internal slope compensation is
increased by 25%. Synchronizing to a significantly higher ratio will reduce
the effective amount of slope compensation, which could result in sub-
harmonic oscillation for duty cycles greater than 50%
Note 7:
Rise and fall times are measured at 10% and 90% levels.
