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SGLS245D MAY 2004 REVISED APRIL 2008
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
D
Qualified for Automotive Applications
D
ESD Protection Exceeds 200 V Using
Machine Model (C = 200 pF, R = 0)
D
100-
µ
A Typical Starting Supply Current
D
500-
µ
A Typical Operating Supply Current
D
Operation to 1 MHz
D
Internal Soft Start
D
Internal Fault Soft Start
D
Internal Leading-Edge Blanking of the
Current Sense Signal
D
1-A Totem-Pole Output
D
70-ns Typical Response From
Current-Sense to Gate Drive Output
D
1.5% Tolerance Voltage Reference
D
Same 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 off-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






















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 MAY 2004 REVISED APRIL 2008
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
block diagram AVAILABLE OPTIONS
TA
ORDERABLE PART
NUMBER
UCC2813QDR-0Q1
UCC2813QDR-1Q1
UCC2813QDR-2Q1
40
_
C to 125
_
C
UCC2813QDR-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
V
CC
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 MAY 2004 REVISED APRIL 2008
3
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
ordering information
UCC2813-
Q
D
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) V
CC
voltage
w

12 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V
CC
current
w

30 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output current, I
O

±
1 A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output energy (capacitive load)
20
µ
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog inputs (FB, CS)
0.3 V to 6.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power dissipation at T
A
< +25
_
C
(D package)
0.65 W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
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.
w
In 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 T
A
= 40
_
C to 125
_
C, V
CC
= 10 V (see Note 1), RT = 100 k from REF to
RC, CT = 330 pF from RC to GND, 0.1-F capacitor from V
CC
to GND, 0.1-F capacitor from V
REF
to
GND, and T
A
= T
J
(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
µ
V
Long term stability
1000 hours,
See Note 7
TA = 125
_
C
5
mV
Output short-circuit current
5
35
mA


SGLS245D MAY 2004 REVISED APRIL 2008
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
electrical characteristics T
A
= 40
_
C to 125
_
C, V
CC
= 10 V (see Note 1), RT = 100 k from REF to
RC, CT = 330 pF from RC to GND, 0.1 F capacitor from V
CC
to GND, 0.1 F capacitor from V
REF
to GND
and T
A
= T
J
(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
µ
A
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, VSAT (VCC 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


SGLS245D MAY 2004 REVISED APRIL 2008
5
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
electrical characteristics T
A
= 40
_
C to 125
_
C, V
CC
= 10 V (see Note 1), RT = 100 k from REF to
RC, CT = 330 pF from RC to GND, 0.1 F capacitor from V
CC
to GND, 0.1 F capacitor from V
REF
to GND,
and T
A
= T
J
(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 =
D
VCOMP
D
VC