SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
D
D
D
D
D
D
D
D
D
D, N, OR PW PACKAGE
(TOP VIEW)
High Efficiency . . . 60% or Greater
Peak Switch Current . . . 500 mA
Input Current Limit Protection
TTL-Compatible Inhibit
Adjustable Output Voltage
Input Regulation . . . 0.2% Typ
Output Regulation . . . 0.4% Typ
Soft Start-Up Capability
Can be Used in Buck, Boost, and
Inverting Configurations
COMP INPUT
INHIBIT
FREQ CONTROL
SUBSTRATE
GND
CATHODE
ANODE
1
14
2
13
3
12
4
11
5
10
6
9
7
8
VCC
CUR LIM SENS
BASE DRIVE†
BASE†
COL OUT
NC
EMIT OUT
NC − No internal connection
† BASE (11) and BASE DRIVE (12) are used for device testing
only. They normally are not used in circuit applications of the
device.
description/ordering information
The TL497A incorporates all the active functions required in the construction of switching voltage regulators.
It also can be used as the control element to drive external components for high-power-output applications. The
TL497A was designed for ease of use in step-up, step-down, or voltage-inversion applications requiring high
efficiency.
The TL497A is a fixed-on-time variable-frequency switching-voltage-regulator control circuit. The switch-on
time is programmed by a single external capacitor connected between FREQ CONTROL and GND. This
capacitor, CT, is charged by an internal constant-current generator to a predetermined threshold. The charging
current and the threshold vary proportionally with VCC. Thus, the switch-on time remains constant over the
specified range of input voltage (4.5 V to 12 V). Typical on times for various values of CT are as follows:
TIMING CAPACITOR, CT (pF)
ON TIME (µs)
200
250
350
400
500
750
1000
1500
2000
19
22
26
32
44
56
80
120
180
The output voltage is controlled by an external resistor ladder network (R1 and R2 in Figures 1, 2, and 3) that
provides a feedback voltage to the comparator input. This feedback voltage is compared to the reference
voltage of 1.2 V (relative to SUBSTRATE) by the high-gain comparator. When the output voltage decays below
the value required to maintain 1.2 V at the comparator input, the comparator enables the oscillator circuit, which
charges and discharges CT as described above. The internal pass transistor is driven on during the charging
of CT. The internal transistor can be used directly for switching currents up to 500 mA. Its collector and emitter
are uncommitted, and it is current driven to allow operation from the positive supply voltage or ground. An
internal Schottky diode matched to the current characteristics of the internal transistor also is available for
blocking or commutating purposes. The TL497A also has on-chip current-limit circuitry that senses the peak
currents in the switching regulator and protects the inductor against saturation and the pass transistor against
overstress. The current limit is adjustable and is programmed by a single sense resistor, RCL, connected
between VCC and CUR LIM SENS. The current-limit circuitry is activated when 0.7 V is developed across RCL.
External gating is provided by the INHIBIT input. When the INHIBIT input is high, the output is turned off.
Simplicity of design is a primary feature of the TL497A. With only six external components (three resistors, two
capacitors, and one inductor), the TL497A operates in numerous voltage-conversion applications (step-up,
step-down, invert) with as much as 85% of the source power delivered to the load. The TL497A replaces the
TL497 in all applications.
The TL497AC is characterized for operation from 0°C to 70°C. The TL497AI is characterized for operation from
−40°C to 85°C.
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 2005, Texas Instruments Incorporated
!
"# $ %&!!'# "$ (&)*%"# +"#',
!+&%#$ %!
# $('%%"#$ ('! #-' #'!
$ '."$ $#!&
'#$
$#"+"!+ /"!!"#0, !+&%# (!%'$$1 +'$ # '%'$$"!*0 %*&+'
#'$#1 "** ("!"
'#'!$,
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1
SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
AVAILABLE OPTIONS
PACKAGED DEVICES
CHIP
FORM
(Y)
TA
SMALL-OUTLINE
(D)
PLASTIC DIP
(N)
SHRINK
SMALL-OUTLINE
(PW)
0°C to 70°C
TL497ACD
TL497ACN
TL497ACPW
TL497AY
−40°C to 85°C
TL497AID
TL497AIN
—
—
The D and PW packages are only taped and reeled. Add the suffix R to the device type (e.g.,
TL497ACPWR). Chip forms are tested at 25°C.
functional block diagram
BASE†
BASE DRIVE†
CUR LIM SENS
FREQ CONTROL
INHIBIT
COMP INPUT
SUBSTRATE
CATHODE
11
12
13
Current
Limit
Sense
3
2
Oscillator
1
4
10
1.2-V
Reference
8
6
7
† BASE and BASE DRIVE are used for device testing only. They normally are not used in circuit applications of the device.
2
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COL OUT
EMIT OUT
ANODE
SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V
Output voltage, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 V
Input voltage, VI(COMP INPUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V
Input voltage, VI(INHIBIT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V
Diode reverse voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 V
Power switch current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 mA
Diode forward current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 mA
Package thermal impedance, θJA (see Notes 2 and 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . 101°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . . 113°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°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.
NOTES: 1. All voltage values, except diode voltages, are with respect to network ground terminal.
2. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) − TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability.
3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
Supply voltage, VCC
High-level input voltage, VIH
INHIBIT pin
Low-level input voltage, VIL
INHIBIT pin
MAX
4.5
12
2.5
Step-down configuration (see Figure 2)
VI + 2
Vref
Inverting regulator (see Figure 3)
−Vref
UNIT
V
V
0.8
Step-up configuration (see Figure 1)
Output voltage
MIN
V
30
VI − 1
−25
V
Power switch current
500
mA
Diode forward current
500
mA
TL497AC
Operating free-air temperature range, TA
TL497AI
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0
70
−40
85
°C
3
SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
electrical characteristics over recommended operating conditions, VCC = 6 V (unless otherwise
noted)
PARAMETER
TA†
TEST CONDITIONS
High-level input current, INHIBIT
Low-level input current, INHIBIT
Comparator reference voltage
Comparator input bias current
MIN
TL497AC
TYP‡
MAX
UNIT
Full range
0.8
1.5
0.8
1.5
mA
Full range
5
10
5
20
µA
VI = 4.5 V to 6 V
VI = 6 V
Full range
1.2
1.32
1.2
1.26
V
40
100
40
100
µA
0.13
0.2
0.13
0.2
Switch on-state voltage
VI = 4.5 V
Switch off-state current
VI = 4.5 V,
VO = 30 V
Sense voltage, CUR LIM SENS
VI = 6 V
IO = 10 mA
1.08
Full range
25°C
Full range
Full range
10
25°C
1.14
0.85
25°C
Diode reverse voltage
TL497AI
TYP‡
MAX
VI(I) = 5 V
VI(I) = 0 V
IO = 100 mA
IO = 500 mA
Diode forward voltage
MIN
1
50
10
200
0.45
1
50
500
0.45
1
Full range
0.75
0.85
0.75
0.95
IO = 100 mA
IO = 500 mA
Full range
0.9
1
0.9
1.1
Full range
1.33
1.55
1.33
1.75
IO = 500 µA
IO = 200 µA
Full range
Full range
V
V
V
11
Full range
25°C
Off-state supply current
µA
A
30
30
25°C
On-state supply current
V
14
11
15
6
Full range
14
16
9
6
10
mA
9
11
mA
† Full range is 0°C to 70°C for the TL497AC and −40°C to 85°C for the TL497AI.
‡ All typical values are at TA = 25°C.
electrical characteristics over recommended operating conditions, VCC = 6 V, TA = 25°C (unless
otherwise noted)
TL497AY
PARAMETER
TEST CONDITIONS
High-level input current, INHIBIT
Low-level input current, INHIBIT
Comparator reference voltage
Comparator input bias current
Switch on-state voltage
4
MIN
TYP
MAX
UNIT
VI(I) = 5 V
VI(I) = 0 V
0.8
mA
5
µA
VI = 4.5 V to 6 V
VI = 6 V
1.2
V
40
µA
Switch off-state current
VI = 4.5 V,
VI = 4.5 V,
IO = 100 mA
VO = 30 V
0.13
V
10
µA
IO = 10 mA
IO = 100 mA
0.75
Diode forward voltage
IO = 500 mA
1.33
0.9
V
On-state supply current
11
mA
Off-state supply current
6
mA
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SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
APPLICATION INFORMATION
L
RCL
VO
VI
14
13
10
8
DESIGN EQUATIONS
R1
TL497A
I
(PK)
+ 2 I max
O
2
3
4
5
6
7
C (pF) [ 12 t on (ms)
T
RCL
L
R1 + (V
VI
VO
R
13
10
3
4
CO
5
CL
O
– 1.2 V) kW
+ 0.5 V
I
(PK)
R1
8
TL497A
2
I t (ms)
on
(PK)
Choose L (50 to 500 µH), calculate
ton (25 to 150 µs)
BASIC CONFIGURATION
(Peak Switching Current = I(PK) < 500 mA)
1
O
V
I
V
I
R2 = 1.2 kΩ
CT
14
V
CO
L (mH) +
1
ƪ ƫ
C
O
(mF) [ t on(ms)
ƪ
V
V
I I
) I
(PK)
O
O
V
ripple
ƫ
(PK)
R2 = 1.2 kΩ
CT
EXTENDED POWER CONFIGURATION
(using external transistor)
Figure 1. Positive Regulator, Step-Up Configurations
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5
SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
APPLICATION INFORMATION
RCL
L
VO
VI
14
13
10
DESIGN EQUATIONS
8
R1
TL497A
1
3
2
I
CO
4
5
6
7
(PK)
+ 2I
L (mH) +
O
max
V –V
I
O
t on(ms)
I
(PK)
R2 = 1.2 kΩ
Choose L (50 to 500 µH), calculate
ton (10 to 150 µs)
CT
C (pF) [ 12 t on(ms)
T
BASIC CONFIGURATION
(Peak Switching Current = I(PK) < 500 mA)
RCL
R1 + (V
L
VO
VI
R
C
14
13
10
8
2
3
4
O
+
(mF) [ t on(ms)
CO
5
6
7
R2 = 1.2 kΩ
CT
EXTENDED POWER CONFIGURATION
(using external transistor)
Figure 2. Positive Regulator, Step-Down Configurations
6
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• DALLAS, TEXAS 75265
– 1.2 V) kW
0.5 V
I
(PK)
R1
TL497A
1
CL
O
ƪ
V
I
*V
V
O
O
V
I
(PK)
ripple
) I
(PK)
O
ƫ
SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
APPLICATION INFORMATION
L
RCL
VI
DESIGN EQUATIONS
14 13
10
8
R1
†
I
2
3
ƫ
Ť Ť
CO
TL497A
1
ƪ
V
+ 2 I max 1 ) O
(PK)
O
V
I
4
L (mH) +
R2 = 1.2 kΩ
5
VO
CT
V
I
I t (ms)
on
(PK)
Choose L (50 to 500 µH), calculate
ton (10 to 150 µs)
C (pF) [ 12 t on(ms)
T
BASIC CONFIGURATION
(Peak Switching Current = I(PK) < 500 mA)
RCL
R1 +
L
R
VI
C
14
13
10
8
R1
2
3
4
O
+ 0.5 V
I
(PK)
(mF) [ t on(ms)
ƪŤ
V
V
I
O
Ť I(PK) ) IO
V
ripple
ƫ
(PK)
†
TL497A
1
CL
ǒŤ VOŤ – 1.2 VǓ kW
CO
5
R2 = 1.2 kΩ
VO
CT
EXTENDED POWER CONFIGURATION
(using external transistor)
† Use external catch diode, e.g., 1N4001, when building an inverting supply with the TL497A.
Figure 3. Inverting Applications
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7
SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
APPLICATION INFORMATION
Switching
Circuit
VI
VO
3-Term
Reg < 12 V
Control
14
13
TL497A
5
EXTENDED INPUT CONFIGURATION WITHOUT CURRENT LIMIT
RCL
VI
Switching
Circuit
VO
DESIGN EQUATIONS
Q1
Vreg
3-Term
Reg < 12 V
V
10 mA
R
CL
+
1 kΩ
R1 )
Control
R2
14
5
Q2
CURRENT LIMIT FOR EXTENDED INPUT CONFIGURATION
Figure 4. Extended Input Voltage Range (VI > 12 V)
8
I
B(Q2)
Ǔ
R2 + V reg * 1 10 kW
TL497A
R1
BE(Q1)
limit (PK)
V
I
ǒ
13
I
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PACKAGE OPTION ADDENDUM
www.ti.com
18-Nov-2006
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
TL497ACD
ACTIVE
SOIC
D
14
50
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497ACDE4
ACTIVE
SOIC
D
14
50
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497ACDR
ACTIVE
SOIC
D
14
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497ACDRE4
ACTIVE
SOIC
D
14
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497ACN
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
TL497ACNE4
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
TL497ACNSLE
OBSOLETE
SO
NS
14
TL497ACNSR
ACTIVE
SO
NS
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497ACNSRE4
ACTIVE
SO
NS
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497ACPWR
ACTIVE
TSSOP
PW
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497ACPWRE4
ACTIVE
TSSOP
PW
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497ACPWRG4
ACTIVE
TSSOP
PW
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497AID
ACTIVE
SOIC
D
14
50
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497AIDE4
ACTIVE
SOIC
D
14
50
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497AIDR
ACTIVE
SOIC
D
14
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL497AIDRE4
ACTIVE
SOIC
D
14
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TBD
Lead/Ball Finish
Call TI
MSL Peak Temp (3)
Call TI
TL497AIJ
OBSOLETE
CDIP
J
14
TBD
Call TI
TL497AIN
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
Call TI
N / A for Pkg Type
TL497AINE4
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
(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
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
18-Nov-2006
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.
Addendum-Page 2
MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,30
0,19
0,65
14
0,10 M
8
0,15 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
1
7
0°– 8°
A
0,75
0,50
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,10
8
14
16
20
24
28
A MAX
3,10
5,10
5,10
6,60
7,90
9,80
A MIN
2,90
4,90
4,90
6,40
7,70
9,60
DIM
4040064/F 01/97
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion not to exceed 0,15.
Falls within JEDEC MO-153
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in
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TI assumes no liability for applications assistance or customer product design. Customers are responsible for
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dsp.ti.com
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interface.ti.com
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logic.ti.com
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microcontroller.ti.com
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