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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DQualified for Automotive Applications
DESD Protection Exceeds 200 V Using
Machine Model (C = 200 pF, R = 0)
D100-µA Typical Starting Supply Current
D500-µA Typical Operating Supply Current
DOperation to 1 MHz
DInternal Soft Start
DInternal Fault Soft Start
DInternal Leading-Edge Blanking of the
Current Sense Signal
D1-A Totem-Pole Output
D70-ns Typical Response From
Current-Sense to Gate Drive Output
D1.5% Tolerance Voltage Reference
DSame Pinout as UC3802, UC3842, and
UC3842A
description
The UCC2813-0/-1/-2/-3/-4/-5 family of high-speed low-power integrated circuits contain all of the control and
drive components required for of f-line and dc-to-dc fixed-frequency current-mode switching power supplies with
minimal parts count.
These devices have the same pin configuration as the UC2842/3/4/5 family and also offer the added features
of internal full-cycle soft start and internal leading-edge blanking of the current-sense input.
The UCC2813-0/-1/-2/-3/-4/-5 family offers choice of maximum duty cycle and critical voltage levels. Lower
reference parts, such as the UCC2813-3 and UCC2813-5, fit best into battery-operated systems, while the
higher reference and the higher undervoltage lockout (UVLO) hysteresis of the UCC2813-2 and UCC2813-4
make these ideal choices for use in off-line power supplies.
The UCC2813-x series is specified for the automotive temperature range of −40_C to 125_C.
PART NUMBER MAXIMUM DUTY CYCLE REFERENCE VOLTAGE TURN-ON THRESHOLD TURN-OFF THRESHOLD
UCC2813-0 100% 5 V 7.2 V 6.9 V
UCC2813-1 50% 5 V 9.4 V 7.4 V
UCC2813-2 100% 5 V 12.5 V 8.3 V
UCC2813-3 100% 4 V 4.1 V 3.6 V
UCC2813-4 50% 5 V 12.5 V 8.3 V
UCC2813-5 50% 4 V 4.1 V 3.6 V
Copyright 2008 Texas Instruments Incorporated
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$(%$2 #++ )#!#"($(!%-
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.
SGLS245D − M AY 2004 − REVISED APRIL 2008
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
block diagram
−
−
−
AVAILABLE OPTIONS†‡
TAORDERABLE PART
NUMBER
UCC2813QDR-0Q1
UCC2813QDR-1Q1
UCC2813QDR-2Q1
−40_C to 125_CUCC2813QDR-3Q1
−40 C to 125 C
UCC2813QDR-4Q1
UCC2813QDR-5Q1
UCC2813QPWR-3Q1
†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
www.ti.com.
‡Package drawings, thermal data, and symbolization
are available at www.ti.com/packaging.
1
2
3
4
8
7
6
5
COMP
FB
CS
RC
REF
VCC
OUT
GND
D PACKAGE
(TOP VIEW)
1
2
3
4
8
7
6
5
COMP
FB
CS
RC
REF
VCC
OUT
GND
TSSOP-8 PW PACKAGE
(TOP VIEW)
SGLS245D − M AY 2004 − REVISED APRIL 2008
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ordering information
UCC2813- QD
Package
D = Plastic SOIC, PW = Plastic TSSOP
Product Option
0 through 5
Automotive Temperature Range Indicator
R
Tape and Reel Indicator
0
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†‡
VCC voltage w 12 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCC current w 30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output current, IO ±1 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output energy (capacitive load) 20 µJ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog inputs (FB, CS) −0.3 V to 6.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power dissipation at TA < +25_C (D package) 0.65 W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg −65_C to 150_C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds 300_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.
‡Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.
wIn normal operation VCC is powered through a current limiting resistor. Absolute maximum of 12 V applies when VCC is driven from a low
impedance source such that ICC does not exceed 30 mA (which includes gate drive current requirement).
electrical characteristics TA = −40_C to 125_C, VCC = 10 V (see Note 1), RT = 100 kΩ from REF to
RC, CT = 330 pF from RC to GND, 0.1-F capacitor from VCC to GND, 0.1-F capacitor from VREF to
GND, and TA = TJ (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Reference Section
Output voltage
TJ = 25_C, I = 0.2 mA
UCC2813-0/-1/-2/-4 4.925 5 5.075
V
Output voltage TJ = 25_C, I = 0.2 mA UCC2813-3/-5 3.94 4 4.06 V
Load regulation voltage I = 0.2 mA to 5 mA 10 30 mV
Total variation voltage
See Note 5
UCC2813-0/-1/-2/-4 4.84 5 5.1
V
Total variation voltage See Note 5 UCC2813-3/-5 3.84 4 4.08 V
Output noise voltage f = 10 Hz to 10 kHz,
See Note 7 TJ = 25_C 70 µV
Long term stability 1000 hours,
See Note 7 TA = 125_C 5 mV
Output short-circuit current −5 −35 mA
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4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics TA = −40_C to 125_C, VCC = 10 V (see Note 1), RT = 100 kΩ from REF to
RC, CT = 330 pF from RC to GND, 0.1 F capacitor from VCC to GND, 0.1 F capacitor from VREF to GND
and TA = TJ (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Oscillator Section
Oscillator frequency
See Note 2
UCC2813-0/-1/-2/-4 40 46 52
kHz
Oscillator frequency See Note 2 UCC2813-3/-5 26 31 36 kHz
Temperature stability See Note 7 2.5 %
Amplitude, peak to peak 2.25 2.4 2.55 V
Oscillator peak voltage 2.45 V
Error Amplifier Section
Input voltage
COMP = 2.5 V UCC2813-0/-1/-2/-4 2.42 2.5 2.56
V
Input voltage COMP = 2.0 V UCC2813-3/-5 1.92 2 2.05 V
Input bias current −2 2 µA
Open loop voltage gain 60 80 dB
COMP sink current FB = 2.7 V, COMP = 1.1 V 0.3 3.5 mA
COMP source current FB = 1.8 V, COMP = REF − 1.2 V −0.2 −0.5 −0.8 mA
Gain bandwidth product See Note 7 2 MHz
PWM Section
Maximum duty cycle
UCC2813-0/-2/-3 97 99 100
%
Maximum duty cycle UCC2813-1/-4/-5 48 49 50 %
Minimum duty cycle COMP = 0 V 0 %
Current Sense Section
Gain See Note 3 1.1 1.65 1.8 V/V
Maximum input signal COMP = 5 V, See Note 4 0.9 1 1.1 V
Input bias current −200 200 nA
CS blank time 50 100 150 ns
Over-current threshold voltage 1.32 1.55 1.7 V
COMP to CS offset voltage CS = 0 V 0.45 0.9 1.35 V
Output Section (OUT)
IOUT = 20 mA All parts 0.1 0.4
Low-level output voltage
IOUT = 200 mA All parts 0.35 0.9
V
Low-level output voltage IOUT = 50 mA, VCC = 5 V UCC2813-3/-5 0.15 0.4 V
IOUT = 20 mA, VCC = 0 V All parts 0.7 1.2
IOUT = −20 mA All parts 0.15 0.4
High-level output voltage, V
SAT
(V
CC
− OUT) IOUT = −200 mA All parts 1 1.9 V
High-level output voltage, VSAT (VCC − OUT)
IOUT = −50 mA, VCC = 5 V UCC2813-3/-5 0.4 0.9
V
Rise time CL = 1 nF 41 70 ns
Fall time CL = 1 nF 44 75 ns
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electrical characteristics TA = −40_C to 125_C, VCC = 10 V (see Note 1), RT = 100 kΩ from REF to
RC, CT = 330 pF from RC to GND, 0.1 F capacitor from VCC to GND, 0.1 F capacitor from VREF to GND,
and TA = TJ (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Undervoltage Lockout Section
UCC2813-0 6.6 7.2 7.8
Start threshold
See Note 6
UCC2813-1 8.6 9.4 10.2
V
Start threshold See Note 6 UCC2813-2/-4 11.5 12.5 13.5 V
UCC2813-3/-5 3.7 4.1 4.5
UCC2813-0 6.3 6.9 7.5
Stop threshold
See Note 6
UCC2813-1 6.8 7.4 8
V
Stop threshold See Note 6 UCC2813-2/-4 7.6 8.3 9 V
UCC2813-3/-5 3.2 3.6 4
UCC2813-0 0.12 0.3 0.48
Start to stop hysteresis
UCC2813-1 1.6 2 2.4
V
Start to stop hysteresis UCC2813-2/-4 3.5 4.2 5.1 V
UCC2813-3/-5 0.2 0.5 0.8
Soft-Start Section
COMP rise time FB = 1.8 V, Rise from 0.5 V to REF − 1 V 4 10 ms
Overall
Start-up current VCC < Start hreshold 0.1 0.23 mA
Operating supply current FB = 0 V, CS = 0 V, RC = 0 V 0.5 1.2 mA
VCC internal zener voltage ICC = 10 mA, See Notes 6 and 8 12 13.5 15 V
VCC internal zener voltage minus start
threshold voltage See Note 6 UCC2813-2/-4 0.5 1.0 V
NOTES: 1. Adjust VCC above the start threshold before setting at 10 V.
2. Oscillator frequency for the UCC2813-0, UCC2813-2, and UCC2813-3 is the output frequency.
Oscillator frequency for the UCC2813-1, UCC2813-4, and UCC2813-5 is twice the output frequency.
3. Gain is defined by: A = DVCOMP
DVCS
0 v VCS v 0.8 V.
4. Parameter measured at trip point of latch with pin 2 at 0 V.
5. Total variation includes temperature stability and load regulation.
6. Start threshold, stop threshold, and Zener shunt thresholds track one another.
7. Not production tested
8. The device is fully operating in clamp mode as the forcing current is higher than the normal operating supply current.
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detailed terminal descriptions
COMP
COMP is the output of the error amplifier and the input of the PWM comparator.
Unlike other devices, the error amplifier in the UCC2813 family is a true, low output-impedance, 2-MHz
operational amplifier. As such, the COMP terminal can both source and sink current. However, the error
amplifier is internally current limited, so that one can command zero duty cycle by externally forcing COMP to
GND.
The UCC2813 family features built-in full-cycle soft start. Soft start is implemented as a clamp on the maximum
COMP voltage.
CS
CS is the input to the current sense comparators. The UCC2813 family has two different current sense
comparators: the PWM comparator and an overcurrent comparator.
The UCC2813 family contains digital current sense filtering, which disconnects the CS terminal from the current
sense comparator during the 100 ns interval immediately following the rising edge of the OUT pin. This digital
filtering, also called leading-edge blanking, means that in most applications, no analog filtering (RC filter) is
required on CS. Compared to an external RC filter technique, the leading-edge blanking provides a smaller
effective CS to OUT propagation delay. Note, however, that the minimum non-zero on time of the OUT signal
is directly affected by the leading-edge blanking and the CS to OUT propagation delay.
The overcurrent comparator is only intended for fault sensing, and exceeding the overcurrent threshold causes
a soft start cycle.
FB
FB is the inverting input of the error amplifier. For best stability, keep FB lead length as short as possible and
FB stray capacitance as small as possible.
GND
GND is reference ground and power ground for all functions on this part.
OUT
OUT is the output of a high-current power driver capable of driving the gate of a power MOSFET with peak
currents exceeding "750 mA. OUT is actively held low when VCC is below the UVLO threshold.
The high-current power driver consists of FET output devices, which can switch all of the way to GND and all
of the way to VCC. The output stage also provides a low impedance to overshoot and undershoot. This means
that, in many cases, external Schottky clamp diodes are not required.
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detailed descriptions (continued)
RC
RC is the oscillator timing pin. For fixed frequency operation, set timing capacitor charging current by connecting
a resistor from REF to RC. Set frequency by connecting timing capacitor from RC to GND. For best perfomance,
keep the timing capacitor lead to GND as short and direct as possible. If possible, use separate ground traces
for the timing capacitor and all other functions.
The frequency of oscillation can be estimated with the following equations:
UCC2813−0ń1ń2ń4: F+
1.5
R C
U
CC2813−3ńUCC2813−5 : F +1.0
R C
where frequency is in Hz, resistance is in ohms, and capacitance is in farads. The recommended range of the
timing resistors is between 10 kΩ and 200 kΩ and the timing capacitor is 100 pF to 1000 pF. Never use a timing
resistor less than 10 k.
To prevent noise problems, bypass VCC to GND with a ceramic capacitor as close to the VCC pin as possible.
An electrolytic capacitor may also be used in addition to the ceramic capacitor.
voltage reference (REF)
REF is the voltage reference for the error amplifier and also for many other functions on the IC. REF is also used
as the logic power supply for high-speed switching logic on the IC.
When V CC is greater than 1 V and less than the UVLO threshold, REF is pulled to ground through a 5-kΩ resistor.
This means that REF can be used as a logic output indicating power system status. It is important for reference
stability that REF is bypassed to GND with a ceramic capacitor as close to the pin as possible. An electrolytic
capacitor may also be used in addition to the ceramic capacitor. A minimum of 0.1-µF ceramic capacitor is
required. Additional REF bypassing is required for external loads greater than 2.5 mA on the reference.
To prevent noise problems with high-speed switching transients, bypass REF to ground with a ceramic capacitor
close to the IC package.
power (VCC)
VCC is the power input connection for this device. In normal operation, VCC is powered through a current-limiting
resistor. Although quiescent VCC current is low, total supply current will be higher, depending on OUT current.
Total VCC current is the sum of quiescent VCC current and the average OUT current. Knowing the operating
frequency and the MOSFET gate charge (Qg), average OUT current can be calculated from:
IOUT +Qg F.
(1)
(2)
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PARAMETER MEASUREMENT INFORMATION
Figure 1
Oscillator
The UCC2813-0/-1/-2/-3/-4/-5 oscillator generates a sawtooth
waveform o n RC. The rise time is set by the time constant of R T and
CT. The fall time is set by CT and an internal transistor
on-resistance of approximately 125. During the fall time, the output
is off and the maximum duty cycle is reduced below 50% or 100%
depending on the part number. Larger timing capacitors increase
the discharge time and reduce the maximum duty cycle and
frequency.
0.2 V
2.5 V S
RQ
REF
RC
CT
RT
8
4
Figure 2
Error Amplifier
Gain/Phase Response
Figure 3
UCC2813-3/5 VREF
vs
VCC
ILOAD = 0.5 mA
Figure 4
UCC2813-0/1/2/4 Oscillator Frequency
vs
RT and CT
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Figure 5
UCC2813-3/5 Oscillator Frequency
vs
RT and CT
Figure 6
UCC2813-0/2/3 Maximum Duty Cycle
vs
Oscillator Frequency
Figure 7
UCC2813-1/4/5 Maximum Duty Cycle
vs
Oscillator Frequency
Figure 8
UCC2813-0 I
CC
vs
Oscillator Frequency
SGLS245D − M AY 2004 − REVISED APRIL 2008
10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Figure 9
UCC2813-5 I
CC
vs
Oscillator Frequency
Figure 10
Dead Time
vs
CT
RT = 100 kW
Figure 11
COMP to CS Offset
vs
Temperature
CS = 0 V
PACKAGE OPTION ADDENDUM
www.ti.com 28-Jun-2012
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
UCC2813QDR-0Q1 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UCC2813QDR-1Q1 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UCC2813QDR-2Q1 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UCC2813QDR-3Q1 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UCC2813QDR-4Q1 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UCC2813QDR-5Q1 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UCC2813QPWR-3Q1 ACTIVE TSSOP PW 8 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
(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
PACKAGE OPTION ADDENDUM
www.ti.com 28-Jun-2012
Addendum-Page 2
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 UCC2813-0-Q1, UCC2813-1-Q1, UCC2813-2-Q1, UCC2813-3-Q1, UCC2813-4-Q1, UCC2813-5-Q1 :
•Catalog: UCC2813-0, UCC2813-1, UCC2813-2, UCC2813-3, UCC2813-4, UCC2813-5
NOTE: Qualified Version Definitions:
•Catalog - TI's standard catalog product
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