The TPS786 family of low-dropout (LDO) low-power linear voltage regulators features high power-supply rejection ratio (PSRR), ultralow noise, fast start-up, and excellent line and load transient responses in small outline, SOT223-6 and DDPAK-5 packages. Each device in the family is stable, with a small 1-μF ceramic capacitor on the output. The family uses an advanced, proprietary BiCMOS fabrication process to yield extremely low dropout voltages (for example, 390 mV at 1.5 A). Each device achieves fast start-up times (approximately 50 μs with a 0.001-μF bypass capacitor) while consuming very low quiescent current (265 μA, typical). Moreover, when the device is placed in standby mode, the supply current is reduced to less than 1 μA. The TPS78630 exhibits approximately 48 μVRMS of output voltage at 3-V output noise with a 0.1-μF bypass capacitor. Applications with analog components that are noise sensitive, such as portable RF electronics, benefit from the high PSRR, low noise features, and the fast response time.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS786 | TO-263 (5) | 10.16 mm × 8.42 mm |
SOT-223 (6) | 6.50 mm × 3.50 mm | |
SON (8) | 3.00 mm × 3.00 mm |
Changes from L Revision (October 2010) to M Revision
Changes from K Revision (August, 2010) to L Revision
Changes from J Revision (May, 2009) to K Revision
PIN | I/O | DESCRIPTION | |||
---|---|---|---|---|---|
NAME | SOT-223 | TO-263 | SON | ||
NR | 5 | 5 | 5 | — | Noise-reduction pin for fixed versions only. An external bypass capacitor, connected to this terminal, in conjunction with an internal resistor, creates a low-pass filter to further reduce regulator noise. |
EN | 1 | 1 | 8 | I | The EN terminal is an input that enables or shuts down the device. When EN is a logic high, the device is enabled. When the device is a logic low, the device is in shutdown mode. |
FB | 5 | 5 | 5 | I | Feedback input voltage for the adjustable device. |
GND | 3, 6 | 3, TAB | 6 | — | Regulator ground |
IN | 2 | 2 | 1, 2 | I | Input supply |
OUT | 4 | 4 | 3, 4 | O | Regulator output |
MIN | MAX | UNIT | |
---|---|---|---|
VIN | –0.3 | 6 | V |
VEN | –0.3 | VIN + 0.3 | V |
VOUT | 6 | V | |
Peak output current | Internally limited | ||
Continuous total power dissipation | See Thermal Information | ||
Junction temperature, TJ | –40 | 150 | °C |
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | ||||
---|---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) | ±2000 | V | |
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) | ±500 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
VIN Input supply voltage | 2.7 | 5.5 | V | ||
IOUT Output current | 0 | 1.5 | A | ||
TJ Operating junction temperature | –40 | 125 | °C |
THERMAL METRIC(1)(2) | TPS786(3) | UNIT | |||
---|---|---|---|---|---|
DRB (SON) | DCQ (S0T-223) | KTT (TO-263) | |||
8 PINS | 6 PINS | 5 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 41.1 | 54.2 | 40.7 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 49.1 | 33.3 | 43.1 | °C/W |
RθJB | Junction-to-board thermal resistance | 16.6 | 8.9 | 21.5 | °C/W |
ψJT | Junction-to-top characterization parameter | 0.7 | 2.6 | 9.4 | °C/W |
ψJB | Junction-to-board characterization parameter | 16.8 | 8.8 | 20 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 5.2 | N/A | 2.1 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |||
---|---|---|---|---|---|---|---|---|
Input voltage, VIN(1) | 2.7 | 5.5 | V | |||||
Internal reference, VFB (TPS78601) | 1.200 | 1.225 | 1.250 | V | ||||
Continuous output current IOUT | 0 | 1.5 | A | |||||
Output voltage |
Output voltage range | TPS78601 | 1.225 | 5.5 – VDO | V | |||
Accuracy | TPS78601(2) | 0 μA ≤ IOUT ≤ 1.5 A, VOUT + 1 V ≤ VIN ≤ 5.5 V(1) | (0.98)VOUT | VOUT | (1.02)VOUT | V | ||
Fixed VOUT < 5 V | 0 μA ≤ IOUT ≤ 1.5 A, VOUT + 1 V ≤ VIN ≤ 5.5 V(1) | –2% | 2% | |||||
Fixed VOUT = 5 V | 0 μA ≤ IOUT ≤ 1.5 A, VOUT + 1 V ≤ VIN ≤ 5.5 V(1) | –3% | 3% | |||||
Output voltage line regulation (ΔVOUT%/VIN)(1) | VOUT + 1 V ≤ VIN ≤ 5.5 V | 5 | 12 | %/V | ||||
Load regulation (ΔVOUT%/VOUT) | 0 μA ≤ IOUT ≤ 1.5 A | 7 | mV | |||||
Dropout voltage(3)
VIN = VOUT(nom) – 0.1 V |
TPS78628 | IOUT = 1.5 A | 410 | 580 | mV | |||
TPS78630 | IOUT = 1.5 A | 390 | 550 | |||||
TPS78633 | IOUT = 1.5 A | 340 | 510 | |||||
TPS78650 | IOUT = 1.5 A | 310 | 470 | |||||
Output current limit | VOUT = 0 V | 2.4 | 4.2 | A | ||||
Ground pin current | 0 μA ≤ IOUT ≤ 1.5 A | 260 | 385 | μA | ||||
Shutdown current(4) | VEN = 0 V, 2.7 V ≤ VIN ≤ 5.5 V | 0.07 | 1 | μA | ||||
FB pin current | VFB = 1.225 V | 1 | μA | |||||
Power-supply ripple rejection | TPS78630 | f = 100 Hz, IOUT = 10 mA | 59 | dB | ||||
f = 100 Hz, IOUT = 1.5 A | 52 | |||||||
f = 10 kHz, IOUT = 1.5 A | 49 | |||||||
f = 100 kHz, IOUT = 1.5 A | 32 | |||||||
Output noise voltage (TPS78630) | BW = 100 Hz to 100 kHz, IOUT = 1.5 A |
CNR = 0.001 μF | 66 | μVRMS | ||||
CNR = 0.0047 μF | 51 | |||||||
CNR = 0.01 μF | 49 | |||||||
CNR = 0.1 μF | 48 | |||||||
Time, start-up (TPS78630) | RL = 2 Ω, COUT = 1 μF | CNR = 0.001 μF | 50 | μs | ||||
CNR = 0.0047 μF | 75 | |||||||
CNR = 0.01 μF | 110 | |||||||
High-level enable input voltage | 2.7 V ≤ VIN ≤ 5.5 V | 1.7 | VIN | V | ||||
Low-level enable input voltage | 2.7 V ≤ VIN ≤ 5.5 V | 0 | 0.7 | V | ||||
EN pin current | VEN = 0 | –1 | 1 | μA | ||||
UVLO threshold | VCC rising | 2.25 | 2.65 | V | ||||
UVLO hysteresis | 100 | mV |
The TPS786 family of low-dropout regulators offers low dropout voltages, high PSRR, and low-output noise.
The TPS786 PMOS-pass transistor has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (for example, during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might be appropriate.
The TPS786 features internal current limiting and thermal protection. During normal operation, the TPS786 limits output current to approximately 2.8 A. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure, take care not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds approximately 165°C, thermal-protection circuitry shuts it down. Once the device has cooled down to below approximately 140°C, regulator operation resumes.
Driving EN over 1.7 V turns on the regulator. Driving EN below 0.7 V puts the regulator into shutdown mode, thus reducing the operating current to 70 nA, nominal.