Texas Instruments TL499ACPS, TL499ACP Datasheet
TL499A
WIDE-RANGE POWER-SUPPLY CONTROLLERS
SLVS029F – JANUARY 1984 – REVISED MAY 2000
D
Internal Series-Pass and Step-Up Switching
Regulator
D
Output Adjustable From 2.9 V to 30 V
D
1-V to 10-V Input for Switching Regulator
D
4.5-V to 32-V Input for Series Regulator
D
Externally Controlled Switching Current
D
No External Rectifier Required
SERIES IN1
SW REG IN2
SW CURRENT CTRL
P OR PS PACKAGE
(TOP VIEW)
1
REF
2
3
4
OUTPUT
8
GND (PWR)
7
SW IN
6
GND
5
description
The TL499A is an integrated circuit designed to provide a wide range of adjustable regulated supply voltages.
The regulated output voltage can be varied from 2.9 V to 30 V by adjusting two external resistors. When the
TL499A is ac-coupled to line power through a step-down transformer, it operates as a series dc voltage regulator
to maintain the regulated output voltage. With the addition of a battery from 1.1 V to 10 V, an inductor, a filter
capacitor, and two resistors, the TL499A operates as a step-up switching regulator during an ac-line failure.
The adjustable regulated output voltage makes the TL499A useful for a wide range of applications. Providing
backup power during an ac-line failure makes the TL499A extremely useful in microprocessor memory
applications.
The TL499AC is characterized for operation from –20°C to 85°C.
AVAILABLE OPTIONS
T
A
–20°C to 85°C TL499ACP TL499ACPS TL499AY
The PS package is available taped and reeled. Add the suffix R to device
type (e.g., TL499ACPSR). Chip forms are tested at 25°C.
PLASTIC DIP
(P)
PLASTIC
SMALL-OUTLINE
(PS)
CHIP FORM
(Y)
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 2000, Texas Instruments Incorporated
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TL499A
WIDE-RANGE POWER-SUPPLY CONTROLLERS
SLVS029F – JANUARY 1984 – REVISED MAY 2000
functional block diagram
SW IN
SW REG IN2
3
Startup
6
Voltage
Sense
Blocking Diode
8
OUTPUT
SERIES IN1
SW REG
Control
Current Sense
–
+
–
+
1
Startup
5
GND
7
GND (PWR)
4
SW CURRENT CTRL
+
2
REF
+
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL499A
WIDE-RANGE POWER-SUPPLY CONTROLLERS
SLVS029F – JANUARY 1984 – REVISED MAY 2000
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Output voltage, VO (see Note 1) 35 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, series regulator, VI1 35 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, switching regulator, V
2 10 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
Blocking-diode reverse voltage 35 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blocking-diode forward current 1 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power switch current (SW IN) 1 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Notes 2 and 3): P package 85°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .
PS package 95°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
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 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 affect reliability.
3. The package thermal impedance is calculated in accordance with JESD 51.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions
MIN NOM MAX UNIT
Output voltage, V
Input voltage, VI1 (SERIES IN1) 4.5 32 V
Input voltage, VI2 (SW REG IN2) 1.1 10 V
Output-to-input differential voltage, switching regulator , VO – VI2 (see Note 4) 1.2 28.9 V
Continuous output current, I
Power switch current (at SW IN) 500 mA
Current-limiting resistor, R
Filter capacitor 100 470 µF
Pass capacitor 0.1 µF
Inductor, L (dcr ≤ 0.1 Ω) 50 150 µH
Operating free-air temperature, T
NOTE 4: When operating temperature range is TA ≤ 70°C, minimum VO – VI2 is ≥ 1.2 V. When operating temperature range is TA ≤85°C, minimum
VO – VI2 is ≥ 1.9 V.
O
O
CL
A
2.9 30 V
100 mA
150 1000 Ω
–20 85 °C
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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