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The TL499A device 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.
PART NUMBER | PACKAGE (PIN) | BODY SIZE (NOM) |
---|---|---|
TL499A | SO (8) | 6.20 mm × 5.30 mm |
PDIP (8) | 9.81 mm × 6.35 mm |
Changes from G Revision (September 2001) to H Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
GND | 5 | — | Signal ground. |
GND (PWR) | 7 | — | Power ground. |
OUTPUT | 8 | O | Regulated output |
REF | 2 | I | Feedback tap for output voltage |
SERIES IN1 | 1 | — | Power source for series voltage regulator. |
SW CURRENT CTRL | 4 | I/O | Resistor to ground controls switching current |
SW IN | 6 | I/O | Step up switching inductor node |
SW REG IN2 | 3 | — | Power source for step-up switching regulator. |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
VO | Output voltage(2) | –0.3 | 35 | V | |
VI1 | Input voltage, series regulator | –0.3 | 35 | V | |
VI2 | Input voltage, switching regulator | –0.3 | 10 | V | |
Blocking-diode reverse voltage | 35 | V | |||
Blocking-diode forward current | 1 | A | |||
SW IN | Power switch current | 1 | A | ||
Lead temperature 1.6 mm (1/16 inch) from case for 10 seconds | 260 | °C | |||
TJ | Junction temperature | 150 | °C | ||
Tstg | Storage temperature | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±200 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±2000 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
Output voltage, VO | 2.9 | 30 | 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 (1)) | 1.2 | 28.9 | V | ||
Continuous output current, IO | 100 | mA | |||
Power switch current (at SW IN) | 500 | mA | |||
Current-limiting resistor, RCL | 150 | 1000 | Ω | ||
Filter capacitor | 100 | 470 | µF | ||
Pass capacitor | 0.1 | µF | |||
Inductor, L (dcr ≤ 0.1 Ω) | 50 | 150 | µH | ||
Operating free-air temperature, TA | –20 | 85 | °C |
THERMAL METRIC(1) | TL499A | UNIT | ||
---|---|---|---|---|
P (PDIP) | PS (SO) | |||
8 PINS | 8 PINS | |||
RθJA | Junction-to-ambient thermal resistance(2)(3) | 49.7 | 110.7 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 38.8 | 69.0 | °C/W |
RθJB | Junction-to-board thermal resistance | 26.9 | 55.7 | °C/W |
ψJT | Junction-to-top characterization parameter | 16.1 | 20.1 | °C/W |
ψJB | Junction-to-board characterization parameter | 26.7 | 54.9 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
Voltage deviation (see (1)) | 20 | 30 | mV/V | |||
VO – VI2 | Switching regulator minimum boost | TA = –20°C to 70°C | 1.2 | V | ||
TA = –20°C to 85°C | 1.9 | |||||
Dropout voltage | Series regulator | VI1 = 15 V, IO = 50 mA | 1.8 | V | ||
Reference voltage (internal) | VI1 = 5 V, VO = 3 V, IO = 1 mA | 1.2 | 1.26 | 1.32 | V | |
Reference-voltage change with temperature | 5 | 10 | mV/V | |||
Output regulation (of reference voltage) | IO = 1 mA to 50 mA | 10 | 30 | mV/V | ||
Output current (see Figure 3) |
Switching regulator | VI2 = 1.1 V, VO = 12 V, RCL = 150 Ω, TA = 25°C |
10 | mA | ||
VI2 = 1.5 V, VO = 15 V, RCL = 150 Ω, TA = 25°C |
15 | |||||
VI2 = 6 V, VO = 30 V, RCL = 150 Ω, TA = 25°C |
65 | |||||
Series regulator | 100 | |||||
Standby current | Switching regulator | VI2 = 3 V, VO = 9 V, TA = 25°C | 15 | 80 | µA | |
Series regulator | VI1 = 15 V, VO = 9 V, RE2 = 4.7 kΩ | 0.8 | 1.2 | mA |