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Linear Technology
Linear Technology

LTC6992-4 Datasheet

TimerBlox Voltage-Controlled Pulse Width Modulator (PWM)


LTC6992-4 Datasheet Preview


FEATURES
n Pulse Width Modulation (PWM) Controlled by
Simple 0V to 1V Analog Input
n Four Available Options Define Duty Cycle Limits
Minimum Duty Cycle at 0% or 5%
Maximum Duty Cycle at 95% or 100%
n Frequency Range: 3.81Hz to 1MHz
n Single Resistor Programs Frequency with < 2.4%
Maximum Error
n PWM Duty Cycle Error < 4.5% Maximum
n Frequency Modulation (VCO) Capability
n 2.25V to 5.5V Single Supply Operation
n 115μA Supply Current at 100kHz
n 500μs Start-Up Time
n CMOS Output Driver Sources/Sinks 20mA
n –40°C to 125°C Operating Temperature Range
n Available in Low Profile (1mm) SOT-23 (ThinSOT™)
and 2mm × 3mm DFN
APPLICATIONS
n LED Dimming Control
n PWM Servo Loops
n High Vibration, High Acceleration Environments
n Portable and Battery-Powered Equipment
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
TimerBlox and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Electrical Specifications Subject to Change
www.DataSheet4U.com
LTC6992-1/-2/-3/-4
TimerBlox
Voltage-Controlled Pulse
Width Modulator (PWM)
DESCRIPTION
The LTC®6992 is a silicon oscillator with an easy-to-use
analog voltage-controlled pulse width modulation (PWM)
capability. The LTC6992 is part of the TimerBlox™ family
of versatile silicon timing devices.
A single resistor, RSET, programs the LTC6992’s inter-
nal master oscillator frequency. The output frequency
is determined by this master oscillator and an internal
frequency divider, NDIV, programmable to eight settings
from 1 to 16384.
fOUT
=
1MHz
NDIV
50kΩ
RSET
,
NDIV
=
1,4,16
…16384
Applying a voltage between 0V and 1V on the MOD pin sets
the duty cycle, according to the following formula:
Duty
Cycle
=
VMOD
0.8 • VSET
1
8
VMOD 100mV
800mV
The four versions differ in their minimum/maximum duty
cycle. Note that a minimum duty cycle limit of 0% or
maximum duty cycle limit of 100% allows oscillations to
stop at the extreme duty cycle settings.
DEVICE NAME
LTC6992-1
LTC6992-2
LTC6992-3
LTC6992-4
PWM DUTY
CYCLE RANGE
0% to 100%
5% to 95%
0% to 95%
5% to 100%
OUTPUT DUTY CYCLE LIMITS
MIN MAX
GND V+
GND
V+
TYPICAL APPLICATION
1MHz Pulse Width Modulator
ANALOG PWM
DUTY CYCLE
CONTROL
(0V TO 1V)
MOD OUT
LTC6992
GND V+
SET
RSET
50k
DIV
6992 TA01a
V+
C1
0.1μF
MOD
0.5V/DIV
OUT
1V/DIV
2μs/DIV
6992 TA01b
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LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (V+) to GND .........…………………….6V
Maximum Voltage On Any Pin
.............................(GND – 0.3V) ≤ VPIN ≤ (V+ + 0.3V)
Operating Temperature Range (Note 2)
LTC6992C ................................................ 0°C to 70°C
LTC6992I .............................................–40°C to 85°C
LTC6992H.......................................... –40°C to 125°C
Specified Temperature Range (Note 3)
LTC6992C ................................................ 0°C to 70°C
LTC6992I .............................................–40°C to 85°C
LTC6992H.......................................... –40°C to 125°C
Junction Temperature .......................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
TOP VIEW
V+ 1
6 OUT
DIV 2
7
GND
5 GND
SET 3
4 MOD
DCB PACKAGE
6-LEAD (2mm s 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 64°C/W, θJC = 10.6°C/W
EXPOSED PAD (PIN 7) IS GND, PCB CONNECTION IS OPTIONAL
MOD 1
GND 2
SET 3
TOP VIEW
6 OUT
5 V+
4 DIV
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 230°C/W, θJC = 51°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC6992CDCB6-1#PBF
LTC6992IDCB6-1#PBF
LTC6992HDCB6-1#PBF
LTC6992CS6-1#PBF
LTC6992IS6-1#PBF
LTC6992HS6-1#PBF
LTC6992CDCB6-2#PBF
LTC6992IDCB6-2#PBF
LTC6992HDCB6-2#PBF
LTC6992CS6-2#PBF
LTC6992IS6-2#PBF
LTC6992HS6-2#PBF
LTC6992CDCB6-3#PBF
LTC6992IDCB6-3#PBF
LTC6992HDCB6-3#PBF
LTC6992CS6-3#PBF
LTC6992IS6-3#PBF
TAPE AND REEL
LTC6992CDCB6-1#TRPBF
LTC6992IDCB6-1#TRPBF
LTC6992HDCB6-1#TRPBF
LTC6992CS6-1#TRPBF
LTC6992IS6-1#TRPBF
LTC6992HS6-1#TRPBF
LTC6992CDCB6-2#TRPBF
LTC6992IDCB6-2#TRPBF
LTC6992HDCB6-2#TRPBF
LTC6992CS6-2#TRPBF
LTC6992IS6-2#TRPBF
LTC6992HS6-2#TRPBF
LTC6992CDCB6-3#TRPBF
LTC6992IDCB6-3#TRPBF
LTC6992HDCB6-3#TRPBF
LTC6992CS6-3#TRPBF
LTC6992IS6-3#TRPBF
PART MARKING*
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
PACKAGE DESCRIPTION
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
2
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LTC6992-1/LTC6992-2/
www.DataSheet4U.com
LTC6992-3/LTC6992-4
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LTC6992HS6-3#PBF
LTC6992HS6-3#TRPBF
XXXX
6-Lead Plastic TSOT-23
–40°C to 125°C
LTC6992CDCB6-4#PBF LTC6992CDCB6-4#TRPBF XXXX
6-Lead (2mm × 3mm) Plastic DFN 0°C to 70°C
LTC6992IDCB6-4#PBF LTC6992IDCB6-4#TRPBF XXXX
6-Lead (2mm × 3mm) Plastic DFN –40°C to 85°C
LTC6992HDCB6-4#PBF LTC6992HDCB6-4#TRPBF XXXX
6-Lead (2mm × 3mm) Plastic DFN –40°C to 125°C
LTC6992CS6-4#PBF
LTC6992CS6-4#TRPBF
XXXX
6-Lead Plastic TSOT-23
0°C to 70°C
LTC6992IS6-4#PBF
LTC6992IS6-4#TRPBF
XXXX
6-Lead Plastic TSOT-23
–40°C to 85°C
LTC6992HS6-4#PBF
LTC6992HS6-4#TRPBF
XXXX
6-Lead Plastic TSOT-23
–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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.25V to 5.5V, VMOD = 0V to VSET,
DIVCODE = 0 to 15 (NDIV = 1 to 16,384), RSET = 50k to 800k, RLOAD = 5k, CLOAD = 5pF unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Oscillation Frequency
fOUT
ΔfOUT
Output Frequency
Frequency Accuracy (Note 4)
3.81Hz ≤ fOUT ≤ 1MHz
3.81
l
1000000
±0.8 ±1.7
±2.4
Hz
%
%
ΔfOUT/ΔT Frequency Drift Over Temperature
ΔfOUT/ΔV+ Frequency Drift Over Supply
V+ = 4.5V to 5.5V
V+ = 2.25V to 4.5V
l ±0.005
%/°C
l
0.25 0.65
%/V
l
0.08 0.18
%/V
Period Jitter (Note 11)
Long-Term Stability of Output
Frequency (Note 9)
NDIV = 1
NDIV = 4
NDIV = 16
1.2
0.4
0.07
0.15
0.022
TBD
%P-P
%P-P
%RMS
%P-P
%RMS
ppm/√kHz
BWFM
tS,FM
Frequency Modulation Bandwidth
Frequency Change Settling Time
(Note 10)
tMASTER = tOUT/NDIV
TBD kHz
TBD μs
Pulse Width Modulation
ΔD PWM Duty Cycle Accuracy
VMOD = 0.2 • VSET to 0.8 • VSET
VMOD < 0.2 • VSET or VMOD > 0.8 • VSET
l
l
±1.5 ±4.5
±2.0 ±4.9
DMAX
Maximum Duty Cycle Limit
LTC6992-1/LTC6992-3, POL = 0, VMOD = 1V l 100
LTC6992-2/LTC6992-4, POL = 0, VMOD = 1V l 90.5
95
99
DMIN Minimum Duty Cycle Limit
LTC6992-1/LTC6992-4, POL = 0, VMOD = 0V l
0
LTC6992-2/LTC6992-3, POL = 0, VMOD = 0V l
1
5 9.5
BWPWM PWM Duty Cycle Bandwidth
TBD
tS,PWM
Duty Cycle Setting Time (Note 6) tMASTER = tOUT/NDIV
TBD
%
%
%
%
%
%
kHz
μs
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LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.25V to 5.5V, VMOD = 0V to VSET,
DIVCODE = 0 to 15 (NDIV = 1 to 16,384), RSET = 50k to 800k, RLOAD = 5k, CLOAD = 5pF unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Power Supply
V+ Operating Supply Voltage Range
l 2.25
5.5 V
Power-On Reset Voltage
IS Supply Current
RL = ∞, RSET = 50k,
NDIV = 1
RL = ∞, RSET = 50k,
NDIV = 4
RL = ∞, RSET = 50k,
NDIV ≥ 16
RL = ∞, RSET = 800k,
NDIV = 1 to 16, 384
V+ = 5.5V
V+ = 2.25V
V+ = 5.5V
V+ = 2.25V
V+ = 5.5V
V+ = 2.25V
V+ = 5.5V
V+ = 2.25V
l
l
l
l
l
l
l
l
l
1.95
365 450
225 285
350 420
225 280
325 390
215 265
120 170
105 150
V
μA
μA
μA
μA
μA
μA
μA
μA
Analog Inputs
VSET
ΔVSET/ΔT
RSET
Voltage at SET Pin
VSET Drift Over Temperature
Frequency-Setting Resistor
MOD Pin Input Capacitance
l 0.97 1.00 1.03
l ±75
l 50
800
2.5
V
μV/°C
pF
MOD Pin Input Current
l ±10 nA
VMOD,HI
VMOD,LO
VDIV
ΔVDIV/ΔV+
VMOD Voltage for Maximum Duty
Cycle
VMOD Voltage for Minimum Duty
Cycle
DIV Pin Voltage
DIV Pin Valid Code Range (Note 5)
DIV Pin Input Current
LTC6992-1/LTC6992-4, POL = 0, D = 100%
LTC6992-2/LTC6992-3, POL = 0, D = 95%
LTC6992-1/LTC6992-3, POL = 0, D = 0%
LTC6992-2/LTC6992-4, POL = 0, D = 5%
Deviation from Ideal
VDIV/V+ = (DIVCODE + 0.5)/16
l
l 0.064 • VSET
l0
l
l
0.90 • VSET
0.86 • VSET
0.10 • VSET
0.14 • VSET
0.936 • VSET
V+
±1.5
±10nA
V
V
V
V
V
%
Digital Output
IOUT(MAX)
VOH
Output Output Current
High Level Output Voltage
VOL Low Level Output Voltage
V+ = 5.5V
V+ = 3.3V
V+ = 2.25V
V+ = 5.5V
V+ = 3.3V
V+ = 2.25V
IOUT = –1mA
IOUT = –16mA
IOUT = –1mA
IOUT = –10mA
IOUT = –1mA
IOUT = -8mA
IOUT = 1mA
IOUT = 16mA
IOUT = 1mA
IOUT = 10mA
IOUT = 1mA
IOUT = 8mA
l ±20
l 5.45
l 4.84
5.48
5.15
l 3.24
l 2.75
3.27
2.99
l 2.17
l 1.58
2.21
1.88
l 0.02 0.04
l 0.26 0.54
l 0.03 0.05
l 0.22 0.46
l 0.03 0.07
l 0.26 0.54
mA
V
V
V
V
V
V
V
V
V
V
V
V
4
69921234p
Page 4
Part Number LTC6992-4
Manufactur Linear Technology
Description TimerBlox Voltage-Controlled Pulse Width Modulator (PWM)
Total Page 30 Pages
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