SGLS304A − JUNE 2005 − REVISED JUNE 2008
D
D
D
D
D
D
D
D
D
D
Qualified for Automotive Applications
Complete PWM Power Control Circuitry
Completely Synchronized Operation
Internal Undervoltage Lockout Protection
Wide Supply Voltage Range
Internal Short-Circuit Protection
Oscillator Frequency . . . 500 kHz Max
Variable Dead Time Provides Control Over
Total Range
Internal Regulator Provides a Stable 2.5-V
Reference Supply
Available in Q-Temp Automotive
HighRel Automotive Applications
Configuration Control / Print Support
Qualification to Automotive Standards
PW PACKAGE
(TOP VIEW)
CT
RT
ERROR
1IN +
AMPLIFIER 1 1IN −
1FEEDBACK
1DTC
1OUT
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
REF
SCP
2IN +
ERROR
2IN −
AMPLIFIER 2
2FEEDBACK
2DTC
2OUT
VCC
description
The TL1451A incorporates on a single monolithic chip all the functions required in the construction of two
pulse-width-modulation (PWM) control circuits. Designed primarily for power-supply control, the TL1451A
contains an on-chip 2.5-V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators,
undervoltage lockout circuitry, and dual common-emitter output transistor circuits.
The uncommitted output transistors provide common-emitter output capability for each controller. The internal
amplifiers exhibit a common-mode voltage range from 1.04 V to 1.45 V. The dead-time control (DTC)
comparator has no offset unless externally altered and can provide 0% to 100% dead time. The on-chip
oscillator can be operated by terminating RT and CT. During low VCC conditions, the undervoltage lockout
control circuit feature locks the outputs off until the internal circuitry is operational.
The TL1451A is characterized for operation from − 40°C to 125°C.
AVAILABLE OPTIONS{
PACKAGED DEVICES}
TA
TSSOP
(PW)§
−40°C to 125°C
TL1451AQPWRQ1
† For the most current package and ordering information, see the
Package Option Addendum at the end of this document, or see the TI
web site at http://www.ti.com.
‡ Package drawings, thermal data, and symbolization are available at
http://www.ti.com/packaging.
§ The PW package is only available left-end taped and reeled.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
! "#$ ! %#&'" ($)
(#"! " !%$""! %$ *$ $! $+! !#$!
!(( ,-) (#" %"$!!. ($! $"$!!'- "'#($
$!. '' %$$!)
Copyright 2008, Texas Instruments Incorporated
%(#"! "%' /0102 '' %$$! $ $!$(
#'$!! *$,!$ $() '' *$ %(#"!2 %(#"
%"$!!. ($! $"$!!'- "'#($ $!. '' %$$!)
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1
SGLS304A − JUNE 2005 − REVISED JUNE 2008
functional block diagram
2 DTC
ERROR
AMPLIFIER 2
IN +
IN −
2 FEEDBACK
1 FEEDBACK
SCP
VCC RT
9
2
11
14
13
10
+
12
Oscillator
1/2 Vref
5
15
IN −
4
16
REF
UVLO
S
3
PWM
COMP
Reference
Voltage
12 kΩ
R
IN +
2 OUTPUT
−
170 kΩ
ERROR
AMPLIFIER 1
CT
1
R
+
7
−
1 OUTPUT
PWM
COMP
1 DTC
6
8
COMPONENT COUNT
65
Resistors
Capacitors
8
Transistors
105
JFETs
2
18
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GND
SGLS304A − JUNE 2005 − REVISED JUNE 2008
absolute maximum ratings over operating free-air temperature range†
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 V
Amplifier input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V
Collector output voltage, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 V
Collector output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 mA
Continuous power total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40°C to 125°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
TA = 125°C
POWER RATING
PW
838 mW
6.7 mW/°C
536 mW
436 mW
168 mW
recommended operating conditions
MIN
Supply voltage, VCC
Amplifier input voltage, VI
MAX
UNIT
3.6
50
V
1.05
1.45
V
Collector output voltage, VO
50
V
Collector output current, IO
20
mA
Current into feedback terminal
45
µA
Feedback resistor, RF
100
Timing capacitor, CT
150
15000
Timing resistor, RT
5.1
100
kΩ
1
500
kHz
−40
125
°C
Oscillator frequency
Operating free-air temperature, TA
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kΩ
pF
3
SGLS304A − JUNE 2005 − REVISED JUNE 2008
electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)
reference section
TL1451AQ
PARAMETER
Output voltage (pin 16)
TEST CONDITIONS
TA = 25°C
TA = MIN and 125°C
IO = 1 mA
TYP†
MIN
2.4
2.5
2.6
2.35
2.46
−0.63%
2.65
±4%}
TA = 25°C
TA = 125°C
2.0
12.5
0.7
15
TA = MIN
TA = 25°C
0.3
30
1
7.5
TA = 125°C
TA = MIN
0.3
14
0.3
20
10
30
Output voltage change with temperature
Input voltage regulation
Output voltage regulation
VCC = 3.6 V to 40 V
IO = 0.1 mA to 1 mA
MAX
Short-circuit output current
VO = 0
† All typical values are at TA = 25°C unless otherwise indicated.
‡ These parameters are not production tested.
3
UNIT
V
mV
mV
mA
undervoltage lockout section
TL1451AQ
PARAMETER
TEST CONDITIONS
Upper threshold voltage (VCC)
Lower threshold voltage (VCC)
Hysteresis (VCC)
Reset threshold voltage (VCC)
4
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TYP†
TA = 25°C
TA = 125°C
2.72
TA = MIN
TA = 25°C
3.15
TA = 125°C
TA = MIN
1.65
1.7
MAX
UNIT
V
2.6
V
3.09
TA = 25°C
TA = 125°C
80
120
10
50
TA = MIN
TA = 25°C
10
60
1.5
TA = 125°C
0.95
TA = MIN
† All typical values are at TA = 25°C unless otherwise indicated.
MIN
1.5
mV
V
SGLS304A − JUNE 2005 − REVISED JUNE 2008
short-circuit protection control section
PARAMETER
Input threshold voltage (SCP)
TEST CONDITIONS
TA = 25°C
TA = 125°C
650
700
750
400
478
650
TA = MIN
800
880
950
140
185
230
TA = 25°C
TA = 125°C
60
120
70
120
TA = MIN
60
120
Standby voltage (SCP)
Latched input voltage (SCP)
TL1451AQ
MIN TYP†
MAX
Equivalent timing resistance
Comparator threshold voltage (FEEDBACK)
† All typical values are at TA = 25°C unless otherwise indicated.
UNIT
mV
mV
mV
170
kΩ
1.18
V
oscillator section
PARAMETER
TEST CONDITIONS
CT = 330 pF,
RT = 10 kΩ
Frequency
MIN
TL1451AQ
TYP†
TA = 25°C
TA = 125°C
200
193
MAX
195
Standard deviation of frequency
CT = 330 pF,
TA = MIN
RT = 10 kΩ
VCC = 3.6 V to 40 V
TA = 25°C
TA = 125°C
1%
Frequency change with voltage
TA = MIN
3%
UNIT
kHz
2%
1%
Frequency change with temperature
† All typical values are at TA = 25°C unless otherwise indicated.
‡ These parameters are not production tested.
1.37%
± 10%}
dead-time control section
PARAMETER
TEST CONDITIONS
TL1451AQ
TYP†
MAX
MIN
TA = 25°C
TA = MIN and 125°C
Input bias current (DTC)
1
3
µA
2.22
2.32
V
TA = MIN
Zero duty cycle
2.28
2.4
Maximum duty cycle
1.2}
−80
TA = 25°C
TA = 125°C
Input threshold voltage at f = 10 kHz (DTC)
µA
A
−145
Latch mode (source) current (DTC)
Latched input voltage (DTC)
UNIT
2.3
2.05
1.45
2.25}
V
† All typical values are at TA = 25°C unless otherwise indicated.
‡ These parameters are not production tested.
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5
SGLS304A − JUNE 2005 − REVISED JUNE 2008
error-amplifier section
PARAMETER
Input offset voltage
TEST CONDITIONS
VO (FEEDBACK) = 1.25 V
TL1451AQ
MIN
TYP†
VO (FEEDBACK) = 1.25 V
Input bias current
VO (FEEDBACK) = 1.25 V
Common-mode input voltage range
± 10
Open-loop voltage amplification
±100
±100
TA = 25°C
TA = 125°C
160
500
100
500
TA = MIN
142
700
TA = 25°C
TA = 125°C
70
80
70
80
TA = MIN
64
80
Common-mode rejection ratio
60
Positive output voltage swing
2
dB
1.5
MHz
80
dB
V
Negative output voltage swing
1
Output (source) current (FEEDBACK)
VID = − 0.1 V, VO = 1.25 V
VID = 0.1 V, VO = 1.25 V
TA = 25°C
TA = 125°C
0.5
1.6
0.4
1.8
TA = MIN
TA = 25°C
0.3
1.7
−45
−70
−25
−50
−15
−70
TA = 125°C
TA = MIN
nA
V
Unity-gain bandwidth
Output (sink) current (FEEDBACK)
nA
±200
1.05
to
1.45
RF = 200 kΩ
mV
± 12
TA = 125°C
TA = MIN
VCC = 3.6 V to 40 V
UNIT
±7
TA = 25°C
TA = 125°C
TA = MIN
TA = 25°C
Input offset current
MAX
V
mA
µA
† All typical values are at TA = 25°C unless otherwise indicated.
output section
PARAMETER
Collector off-state current
TEST CONDITIONS
TL1451AQ
TYP†
MAX
MIN
VO = 50 V
TA = 25°C
10
TA = 125°C
TA = MIN
Output saturation voltage
Short-circuit output current
† All typical values are at TA = 25°C unless otherwise indicated.
VO = 6 V
1.2
2
1.6
2.4
1.36
2.2
90
UNIT
µA
V
mA
pwm comparator section
PARAMETER
Input threshold voltage at f = 10 kHz (FEEDBACK)
† All typical values are at TA = 25°C unless otherwise indicated.
‡ These parameters are not production tested.
6
Zero duty cycle
TL1451AQ
MIN TYP†
MAX
2.05 2.25}
Maximum duty cycle
1.2}
TEST CONDITIONS
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1.45
UNIT
V
SGLS304A − JUNE 2005 − REVISED JUNE 2008
total device
PARAMETER
TL1451AQ
MIN TYP†
MAX
UNIT
Off-state
1.3
1.8
mA
RT = 10 kΩ
1.7
2.4
mA
TEST CONDITIONS
Standby supply current
Average supply current
† All typical values are at TA = 25°C unless otherwise indicated.
PARAMETER MEASUREMENT INFORMATION
Test
Input
S1
VCC = 5 V
RL
CPE
0.47 µF
4.7 kΩ
OUT1
RL
4.7 kΩ
16 15 14 13 12 11 10
OUT2
9
TL1451A
1
CT
330 pF
2
3
4
5
6
7
8
RT
10 kΩ
Test
Input
Figure 1. Test Circuit
Oscillator Triangle Waveform
Error Amplifier Output
Dead-Time Input Voltage
Short-Circuit Protection
Comparator Input Voltage
PWM Comparator Output Voltage
2.0 V
1.6 V
1.4 V
1.25 V
H
L
Dead Time 100%
H
Output Transistor Collector
Waveform
L
0.6 V
Protection Enable
Terminal Waveform
tpe†
H
Short-Circuit Protection
Comparator Output
Power Supply Voltage
0V
L
3.6 V
2.8 V TYP
0V
† Protection Enable Time, tpe = (0.051 x 106 x Cpe) in seconds
Figure 2. TL1451A Timing Diagram
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7
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
TRIANGLE OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
OSCILLATOR FREQUENCY VARIATION
vs
FREE-AIR TEMPERATURE
3
VCC = 5 V
TA = 25°C
f osc − Oscillator Frequency Variation − %
∆afosc
ffosc
osc − Triangle Oscillator Frequency − Hz
1M
CT = 150 pF
100 k
CT = 1500 pF
10 k
CT = 15000 pF
1k
1k
4k
10 k
40 k
100 k
400 k
VCC = 3.6 V
RT = 10 kΩ
CT = 330 pF
fosc = 200 kHz
2
1
0
−1
−2
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎ
−3
−25
1M
RT − Timing Resistance − Ω
75
0
25
50
TA − Free-Air Temperature − °C
Figure 3
Figure 4
TRIANGLE WAVEFORM PERIOD
vs
TIMING CAPACITANCE
TRIANGLE WAVEFORM SWING VOLTAGE
vs
TIMING CAPACITANCE
102
VCC = 5 V
RT = 5.1 kΩ
TA = 25°C
s
Triangle Waveform Period − µ
uS
Triangle Waveform Swing Voltage − V
2.6
2.4
100
2.2
2
1.8
1.6
1.4
1.2
VCC = 5 V
RT = 5.1 kΩ
TA = 25°C
101
100
1
0.8
101
102
103
104
CT − Timing Capacitance − pF
105
Figure 5
8
10−1
101
102
103
104
CT − Timing Capacitance − pF
Figure 6
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105
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
REFERENCE OUTPUT VOLTAGE VARIATION
vs
FREE-AIR TEMPERATURE
30
avref − Reference Output Voltage Variation − mV
∆VO(ref)
avref − Reference Output Voltage Variation − mV
∆VO(ref)
REFERENCE OUTPUT VOLTAGE VARIATION
vs
FREE-AIR TEMPERATURE
VCC = 3.6 V
II(ref) = 1 mA
20
10
0
−10
ÁÁ
ÁÁ
ÁÁ
ÁÁ
− 20
ÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
− 30
− 25
75
0
25
50
TA − Free-Air Temperature − °C
100
30
VCC = 40 V
II(ref) = 1 mA
20
ÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎ
10
0
−10
ÁÁ
ÁÁ
ÁÁ
ÁÁ
− 20
− 30
− 25
75
0
25
50
TA − Free-Air Temperature − °C
Figure 7
Figure 8
DROPOUT VOLTAGE VARIATION
vs
FREE-TEMPERATURE
REFERENCE OUTPUT VOLTAGE
vs
SUPPLY VOLTAGE
1.1
II(ref) = 1 mA
TA = 25°C
2.5
1
Dropout Voltage Variation − V
VO(ref)
Vref − Reference Output Voltage − V
3
ÁÁ
ÁÁ
ÁÁ
100
2
1.5
1
0.9
0.8
0.7
0.6
0.5
0
0
5
10
15
20
25
30
VCC − Supply Voltage − V
35
40
Figure 9
− 25
0
25
50
75
TA − Free-Air Temperature − °C
100
Figure 10
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9
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
UNDERVOLTAGE LOCKOUT
HYSTERESIS CHARACTERISTICS
− Output Collector Voltage − V
VVCE
CE
Undervoltage Lockout Threshold Voltage − V
TA = 25°C
TA = −20°C
TA = 85°C
ÁÁ
ÁÁ
ÁÁ
UNDERVOLTAGE LOCKOUT CHARACTERISTIC
5
4
3
5V
RL
2
7,10
I = IO
8
VDE
1
300
3.5
IO = 10 mA
3.25
Threshold Voltage −VTH
(Left Scale)
3
200
Threshold Voltage −VTL
(Left Scale)
2.75
150
2.5
100
Hysteresis Voltage
(Right Scale)
50
2.25
0
2
0
0
1
2
4
3
5
−25
0
25
50
Figure 11
Figure 12
SHORT-CIRCUIT PROTECTION CHARACTERISTICS
Comparator Threshold Voltage − V
Short-Circuit Protection
Latch Reset Supply Voltage
(Right Scale)
2
1.20
1.15
1.10
− 25
2.5
Short-Circuit Protection
Comparator Threshold Voltage
(Left Scale)
50
75
0
25
TA − Free-Air Temperature − °C
Figure 13
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1.5
1
100
RS − Latch Reset Supply Voltage − V
3
1.30
1.25
75
TA − Free-Air Temperature − °C
VCC − Supply Voltage − V
10
250
100
Undervoltage Lockout Hystersis Voltage − mV
6
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
PROTECTION ENABLE TIME
vs
PROTECTION ENABLE CAPACITANCE
18
tpe
t pe − Protection Enable Time − s
15
12
9
6
3
0
0
200
50
100
150
CPE − Protection Enable Capacitance − µF
SCP
15
Vref
16
170 kΩ
Short-circuit
Protection
Comparator
12 kΩ
CPE
ERROR AMP 1
ERROR AMP 2
250
Vref
S
R
Protection
Latch
Vref
U.V.L.O.
+
1.25 V
−
Figure 14
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11
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
OPEN-LOOP VOLTAGE AMPLIFICATION
vs
FREQUENCY
ERROR AMP MAXIMUM OUTPUT VOLTAGE SWING
vs
FREQUENCY
2
90
VCC = 5 V
TA = 25°C
Open-Loop Voltage Amplification − dB
Error Amp Maximum Output Voltage Swing − V
2.25
1.75
1.5
1.25
1
0.75
0.5
0.25
0
1k
10 k
100 k
1M
f − Frequency − Hz
VCC = 5 V
TA = 25°C
80
70
60
50
40
30
20
10
0
100
10 M
1k
Figure 15
Figure 16
GAIN (AMPLIFIER IN
UNITY-GAIN CONFIGURATION)
vs
FREQUENCY
10
VCC = 5 V
TA = 25°C
5
G − Gain − dB
0
−5
−10
−15
−20
1k
10 k
100 k
f − Frequency − Hz
Figure 17
12
10 k
100 k
f − Frequency − Hz
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1M
10 M
1M 2M
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
70
Phase Shift
(Right Scale)
50
40
47 pF
470 pF
4700 pF
0°
Closed-Loop Gain
(Left Scale)
−10°
−20°
30
−30°
Phase Shift
Closed-Loop Gain − dB
60
CX:
VCC = 5 V
Rref = 150 Ω
Cref = 470 pF
TA = 25°C
−40°
20
−50°
−60°
−70°
10
−80°
0
100
1k
10 k
100 k
−90°
1M
f − Frequency − Hz
Vref
+
−
39 kΩ
Cx
Rref
Cref
39 kΩ
Test Circuit
Figure 18
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13
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
70
CX:
Phase Shift
(Right Scale)
50
Closed-Loop Gain
(Left Scale)
40
47 pF
470 pF
4700 pF
0°
−10°
−20°
30
−30°
−40°
20
−50°
−60°
−70°
10
−80°
0
100
1k
10 k
100 k
f − Frequency − Hz
Vref
+
−
39 kΩ
Cx
Rref
Cref
39 kΩ
Test Circuit
Figure 19
14
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−90°
1M
Phase Shift
Closed-Loop Gain − dB
60
VCC = 5 V
Rref = 15 Ω
Cref = 470 pF
TA = 25°C
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
70
CX:
50
40
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
47 pF
470 pF
4700 pF
0°
−10°
−20°
30
−30°
Phase Shift
Closed-Loop Gain − dB
60
VCC = 5 V
Rref = 15 Ω
Cref = 470 pF
TA = 25°C
−40°
20
−50°
−60°
−70°
10
−80°
0
100
1k
10 k
100 k
−90°
1M
f − Frequency − Hz
Vref
+
−
39 kΩ
Cx
Rref
Cref
39 kΩ
Test Circuit
Figure 20
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15
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
70
50
0°
40
Closed-Loop Gain
(Left Scale)
Phase Shift
(Right Scale)
30
−10°
−20°
−30°
−40°
20
−50°
−60°
−70°
10
−80°
0
100
1k
10 k
100 k
f − Frequency − Hz
Vref
+
−
39 kΩ
Cref
39 kΩ
Test Circuit
Figure 21
16
www.ti.com
−90°
1M
Phase Shift
Closed-Loop Gain − dB
60
VCC = 5 V
Cref = 470 pF
TA = 25°C
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
OUTPUT SINK CURRENT
vs
COLLECTOR OUTPUT SATURATION VOLTAGE
120
TA = − 20°C
110
TA = 25°C
Output Sink Current − mA
100
90
TA = 85°C
80
70
60
50
40
30
20
VCC = 3.6 V
10
0
0
15
5
10
Collector Output Saturation Voltage − V
20
Figure 22
VO(ref) − 0.01
1
VO(ref) − 0.02
0.9
VO(ref) − 0.03
Maximum Output Voltage
Swing (Right Scale)
0.8
VO(ref) − 0.04
VO(ref) − 0.05
0.7
Maximum Output
Voltage Swing (Right Scale)
0.6
VO(ref) − 0.06
VO(ref) − 0.07
−25
0.5
Vref
VOM − Maximum Output Voltage Swing − V
VOM − Maximum Output Voltage Swing − V
MAXIMUM OUTPUT VOLTAGE SWING
vs
FREE-AIR TEMPERATURE
33 kΩ
+
33 kΩ
−
RL
100 kΩ
Vvom − 1
VCC = 3.6 V
RL = 100 kΩ
VOM+1 = 1.25 V
VOM −1 = 1.15 V (Right Scale)
VOM −1 = 1.35 V (Left Scale)
TEST CIRCUIT
0
25
50
75
TA − Free-Air Temperature − °C
100
Figure 23
www.ti.com
17
SGLS304A − JUNE 2005 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
OUTPUT TRANSISTOR ON DUTY CYCLE
vs
DEAD-TIME INPUT VOLTAGE
STANDBY CURRENT
vs
SUPPLY VOLTAGE
VCC = 3.6 V
RT = 10kΩ
CT = 330 pF
10
20
IICC
CC (Standby) − Standby Current − mA
Output Transistor “On” Duty Cycle − %
0
30
40
50
60
70
ÁÁ
ÁÁ
80
90
100
0
0.5
1
1.5
2
2.5
3
3.5
TA = 25°C
2
1.75
1.5
1.25
1
0.75
0.5
0.25
0
4
0
10
20
30
VCC − Supply Voltage − V
Dead-Time Input Voltage − V
Figure 24
40
Figure 25
MAXIMUM CONTINUOUS POWER DISSIPATION
vs
FREE-AIR TEMPERATURE
STANDBY CURRENT
vs
FREE-AIR TEMPERATURE
I CC − Supply Current − mA
ICC
2
ÁÁ
ÁÁ
1.75
1.5
Maximum Continuous Power Dissipation − mW
1200
Average Supply Current
VCC = 6 V, RT = 10 kΩ,
CT = 330 pF
Stand-By Current, VCC = 40 V, No Load
1.25
1
Stand-By Current, VCC = 3.6 V, No Load
0.75
0.5
0.25
0
−25
0
25
50
75
TA − Free-Air Temperature − °C
100
Figure 26
18
1100
16-Pin N Plastic Dip
1000
Thermal Resistance
125°C/W
900
800
700
600
16-Pin NS Plastic SO
500
400
Thermal Resistance
250°C/W
300
200
100
0
−25
0
25
50
75
TA − Free-Air Temperature
Figure 27
www.ti.com
100
SGLS304A − JUNE 2005 − REVISED JUNE 2008
APPLICATION INFORMATION
VCC
220 kΩ
0.47 µF
150 Ω
470 Ω
50 kΩ
33 kΩ
L1
330 pF
R1
R2
33 kΩ
R3
33 kΩ
33 kΩ
Step-Up
C2 Output
R4
C1
500 pF
Vref
16 15 14 13 12 11 10
9
TL1451A
1
2
3
4
5
6
7
8
470 Ω
470 Ω
R5
C5
220 Ω
500
pF
1 µF
L2
R6
470 Ω
33 kΩ
Step-Down
C4 Output
R7
33 kΩ
NOTE A: Values for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application.
Figure 28. High-Speed Dual Switching Regulator
www.ti.com
19
PACKAGE OPTION ADDENDUM
www.ti.com
20-Oct-2011
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package
Drawing
Pins
Package Qty
Eco Plan
(2)
Lead/
Ball Finish
MSL Peak Temp
TL1451AQPWRG4Q1
ACTIVE
TSSOP
PW
16
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM
TL1451AQPWRQ1
ACTIVE
TSSOP
PW
16
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM
(3)
Samples
(Requires Login)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF TL1451A-Q1 :
• Catalog: TL1451A
• Enhanced Product: TL1451A-EP
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
20-Oct-2011
• Military: TL1451AM
NOTE: Qualified Version Definitions:
• Catalog - TI's standard catalog product
• Enhanced Product - Supports Defense, Aerospace and Medical Applications
• Military - QML certified for Military and Defense Applications
Addendum-Page 2
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