SNVS321O January 2005 – December 2015 LP38691 , LP38691-Q1 , LP38693 , LP38693-Q1
PRODUCTION DATA.
The LP3869x low-dropout CMOS linear regulators provide tight output tolerance (2% typical), extremely low dropout voltage (250 mV at 500-mA load current, VOUT = 5 V), and excellent AC performance using ultralow equivalent series resistance (ESR) ceramic output capacitors.
The low thermal resistance of the WSON, SOT-223, and TO-252 packages allow use of the full operating current even in high ambient temperature environments.
The use of a PMOS power transistor means that no DC base-drive current is required to bias it, thus allowing ground pin current to remain below 100 µA regardless of load current, input voltage, or operating temperature.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LP38691 | TO-252 (3) | 6.58 mm × 6.10 mm |
WSON (6) | 3.00 mm × 3.00 mm | |
LP38693 | SOT-223 (5) | 6.50 mm × 3.56 mm |
WSON (6) | 3.00 mm × 3.00 mm | |
LP38691-Q1 | WSON (6) | 3.00 mm × 3.00 mm |
LP38693-Q1 |
Changes from N Revision (March 2015) to O Revision
Changes from M Revision (February 2015) to N Revision
Changes from L Revision (December 2014) to M Revision
Changes from K Revision (April 2013) to L Revision
Changes from J Revision (April 2013) to K Revision
PIN | I/O | DESCRIPTION | ||||
---|---|---|---|---|---|---|
NAME | TO-252 | WSON | SOT-223 | |||
DAP | — | √ | √ | — | — | WSON Only - The DAP (Exposed Pad) functions as a thermal connection when soldered to a copper plane. See WSON Mounting section for more information. |
EN | — | — | 3 | 1 | I | The EN pin allows the part to be turned ON and OFF by pulling this pin high or low. |
GND | TAB | 2 | 2 | 5 | — | Circuit ground for the regulator. For the TO-252 and SOT-223 packages this is thermally connected to the die and functions as a heat sink when the soldered down to a large copper plane. |
IN | 3 | 1, 6 | 1, 6 | 4 | I | This is the input supply voltage to the regulator. For WSON devices, both IN pins must be tied together for full current operation (250 mA maximum per pin). |
OUT | 1 | 4 | 4 | 3 | O | Regulated output voltage |
SNS | — | 5 | 5 | — | I | WSON Only - Output SNS pin allows remote sensing at the load which eliminate the error in output voltage due to voltage drops caused by the resistance in the traces between the regulator and the load. This pin must be tied to OUT. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Lead temp. (Soldering, 5 seconds) | 260 | °C | ||
Power dissipation(3) | Internally Limited | V | ||
V(max) All pins (with respect to GND) | –0.3 | 12 | V | |
IOUT(4) | Internally Limited | V | ||
Junction temperature | –40 | 150 | °C | |
Storage temperature, Tstg | −65 | 150 |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per AEC Q100-002(1) | ±2000 | V |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
VIN supply voltage | 2.7 | 10 | V | ||
Operating junction temperature | −40 | 125 | °C |
THERMAL METRIC(1) | LP38691 | LP38693 | LP3869x | UNIT | |
---|---|---|---|---|---|
TO-252 | WSON | SOT-223 | |||
3 PINS | 6 PINS | 5 PINS | |||
RθJA(2) | Junction-to-ambient thermal resistance | 50.5 | 50.6 | 68.5 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 52.6 | 44.4 | 52.2 | °C/W |
RθJB | Junction-to-board thermal resistance | 29.7 | 24.9 | 13.0 | °C/W |
ψJT | Junction-to-top characterization parameter | 4.8 | 0.4 | 5.5 | °C/W |
ψJB | Junction-to-board characterization parameter | 29.3 | 25.1 | 12.8 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 1.5 | 5.4 | n/a | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP(1) | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
VO | Output voltage tolerance | –2 | 2 | %VOUT | |||
100 µA < IL < 0.5 A VO + 1 V ≤ VIN ≤ 10 V Full operating temperature range |
–4 | 4 | |||||
ΔVO/ΔVIN | Output voltage line regulation(2) | VO + 0.5 V ≤ VIN ≤ 10 V IL = 25 mA |
0.03 | %/V | |||
VO + 0.5 V ≤ VIN ≤ 10 V IL = 25 mA Full operating temperature range |
0.1 | ||||||
ΔVO/ΔIL | Output voltage load regulation(3) | 1 mA < IL < 0.5 A VIN = VO + 1 V |
1.8 | %/A | |||
1 mA < IL < 0.5 A VIN = VO + 1 V Full operating temperature range |
5 | ||||||
VIN – VOUT | Dropout voltage(4) | (VO = 2.5 V) | IL = 0.1 A | 80 | mV | ||
IL = 0.5 A | 430 | ||||||
(VO = 2.5 V) Full operating temperature range |
IL = 0.1 A | 145 | |||||
IL = 0.5 A | 725 | ||||||
(VO = 3.3 V) | IL = 0.1 A | 65 | |||||
IL = 0.5 A | 330 | ||||||
(VO = 3.3 V) Full operating temperature range |
IL = 0.1 A | 110 | |||||
IL = 0.5 A | 550 | ||||||
(VO = 5 V) | IL = 0.1 A | 45 | |||||
IL = 0.5 A | 250 | ||||||
(VO = 5 V) Full operating temperature range |
IL = 0.1 A | 100 | |||||
IL = 0.5 A | 450 | ||||||
IQ | Quiescent current | VIN ≤ 10 V, IL =100 µA - 0.5 A | 55 | µA | |||
VIN ≤ 10 V, IL =100 µA - 0.5 A Full operating temperature range |
100 | ||||||
VEN ≤ 0.4 V, (LP38693 Only) | 0.001 | 1 | |||||
IL(MIN) | Minimum load current | VIN – VO ≤ 4 V Full operating temperature range |
100 | ||||
IFB | Foldback current limit | VIN – VO > 5 V | 350 | mA | |||
VIN – VO < 4 V | 850 | ||||||
PSRR | Ripple rejection | VIN = VO + 2 V(DC), with 1 V(p-p) / 120-Hz Ripple | 55 | dB | |||
TSD | Thermal shutdown activation (junction temp) | 160 | °C | ||||
TSD (HYST) | Thermal shutdown hysteresis (junction temp) | 10 | |||||
en | Output noise | BW = 10 Hz to 10 kHz VO = 3.3 V |
0.7 | µV/√Hz | |||
VO (LEAK) | Output leakage current | VO = VO(NOM) + 1 V at 10 VIN | 0.5 | 12 | µA | ||
VEN | Enable voltage (LP38693 Only) | Output = OFF Full operating temperature range |
0.4 | V | |||
Output = ON, VIN = 4 V Full operating temperature range |
1.8 | ||||||
Output = ON, VIN = 6 V Full operating temperature range |
3 | ||||||
Output = ON, VIN = 10 V Full operating temperature range |
4 | ||||||
IEN | Enable pin leakage (lLP38693 only) | VEN = 0 V or 10 V, VIN = 10 V | –1 | 0.001 | 1 | µA |
The LP38691 and LP38693 are designed to meet the requirements of portable, battery-powered digital systems providing an accurate output voltage with fast start-up. When disabled via a low logic signal at the enable pin (EN), the power consumption is reduced to virtually zero (LP38693 only).
The LP38691 and LP38693 perform well with a single 1-μF input capacitor and a single 1-μF ceramic output capacitor.
The LP38693 has an Enable pin (EN) which allows an external control signal to turn the regulator output On and Off. The Enable On/Off threshold has no hysteresis. The voltage signal must rise and fall cleanly, and promptly, through the ON and OFF voltage thresholds. The EN pin voltage must be higher than the VEN(MIN) threshold to ensure that the device is fully enabled under all operating conditions. The EN pin voltage must be lower than the VEN(MAX) threshold to ensure that the device is fully disabled. The EN pin has no internal pullup or pulldown to establish a default condition and, as a result, this pin must be terminated either actively or passively. If the EN pin is driven from a source that actively pulls high and low, the drive voltage must not be allowed to go below ground potential or higher than VIN. If the application does not require the Enable function, the pin must be connected directly to the IN pin.
Thermal Shutdown disables the output when the junction temperature rises to approximately 160°C which allows the device to cool. When the junction temperature cools to approximately 150°C, the output circuitry enables.
Based on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This thermal cycling limits the dissipation of the regulator and protects it from damage as a result of overheating. The Thermal Shutdown circuitry of the LP38693 has been designed to protect against temporary thermal overload conditions.
The Thermal Shutdown circuitry was not intended to replace proper heat-sinking. Continuously running the LP38693 device into thermal shutdown degrades device reliability.
Foldback current limiting is built into the LP38691 and LP38693 devices which reduces the amount of output current the part can deliver as the output voltage is reduced. The amount of load current is dependent on the differential voltage between the IN and OUT pins. Typically, when this differential voltage exceeds 5 V, the load current limits at about 350 mA. When the VIN – VOUT differential is reduced below 4 V, load current is limited to about 850 mA.
CAUTION
When toggling the LP38693 Enable (EN) after the input voltage (VIN) is applied, the foldback current limit circuitry is functional the first time that the EN pin is taken high. The foldback current limit circuitry is non-functional the second, and subsequent, times that the EN pin is taken high. Depending on the input and output capacitance values the input inrush current may be higher than expected which can cause the input voltage to droop.
If the EN pin is connected to the IN pin, the foldback current limit circuitry is functional when VIN is applied if VIN starts from less than 0.4 V.
The EN pin voltage must be higher than the VEN(MIN) threshold to ensure that the device is fully enabled under all operating conditions.
The LP38691 and LP38693 do not include any dedicated UVLO circuitry. Neither device internal circuitry is fully functional until VIN is at least 2.7 V. The output voltage is not regulated until VIN ≥ (VOUT + VDO), or 2.7 V, whichever is higher.