SGLS276D January 2005 – March 2016 TPS61040-Q1 , TPS61041-Q1
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
The TPS6104x-Q1 devices are high-frequency boost converters for automotive applications. The devices are ideal for generating output voltages up to 28 V from a pre-regulated low voltage rail, dual-cell NiMH/NiCd or a single-cell Li-Ion battery, supporting input voltages from 1.8 V to 6 V.
The TPS6104x-Q1 devices operate with a switching frequency up to 1 MHz, allowing the use of small external components such as ceramic as well as tantalum output capacitors. Combined with the space-saving, 5-pin SOT-23 package, the TPS6104x-Q1 devices accomplish a small overall solution size. The TPS61040-Q1 device has an internal 400-mA switch current limit, while the TPS61041-Q1 device has a 250-mA switch current limit, offering lower output voltage ripple and allowing the use of a smaller form factor inductor for lower-power applications.
The TPS6104x-Q1 devices operate in a pulse frequency modulation (PFM) scheme with constant peak current control. The combination of low quiescent current (28 µA typical) and the optimized control scheme enable operation of the devices at high efficiencies over the entire load current range.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS6104x-Q1 | SOT-23 (5) | 2.90 mm × 1.60 mm |
Changes from C Revision (April 2012) to D Revision
Changes from B Revision (July 2011) to C Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
EN | 4 | I | This is the enable pin of the device. Pulling this pin to ground forces the device into shutdown mode reducing the supply current to less than 1 µA. This pin must not be left floating and must be terminated. |
FB | 3 | I | This is the feedback pin of the device. Connect this pin to the external voltage divider to program the desired output voltage. |
GND | 2 | — | Ground |
SW | 1 | I | Connect the inductor and the Schottky diode to this pin. This is the switch pin and is connected to the drain of the internal power MOSFET. |
VIN | 5 | I | Supply voltage pin |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Supply voltages on pin VIN (2) | –0.3 | 7 | V | |
Voltages on pins EN, FB (2) | –0.3 | VIN + 0.3 | V | |
Switch voltage on pin SW (2) | 30 | V | ||
Continuous power dissipation | See Thermal Information | |||
TJ | Operating junction temperature | –40 | 150 | °C |
TStg | Storage temperature | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per AEC Q100-002(1) | ±2000 | V |
Charged-device model (CDM), per AEC Q100-011 | ±750 |
MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|
VIN | Input voltage | 1.8 | 6 | V | |
VOUT | Output voltage | 28 | V | ||
L | Inductor(1) | 2.2 | 10 | 47 | μH |
f | Switching frequency(1) | 1 | MHz | ||
CIN | Input capacitor (1) | 4.7 | μF | ||
COUT | Output capacitor (1) | 1 | μF | ||
TA | Operating ambient temperature | –40 | 125 | °C |
THERMAL METRIC(1) | TPS6104x-Q1 | UNIT | |
---|---|---|---|
DBV (SOT-23) | |||
5 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 153.5 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 105.7 | °C/W |
RθJB | Junction-to-board thermal resistance | 33.5 | °C/W |
ψJT | Junction-to-top characterization parameter | 9.8 | °C/W |
ψJB | Junction-to-board characterization parameter | 33.1 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
SUPPLY CURRENT | |||||||
VIN | Input voltage range | 1.8 | 6 | V | |||
IQ | Operating quiescent current | IOUT = 0 mA, not switching, VFB = 1.3 V | 28 | 50 | μA | ||
ISD | Shutdown current | EN = GND | 0.1 | 1 | μA | ||
VUVLO | Undervoltage lockout threshold | 1.5 | 1.7 | V | |||
ENABLE | |||||||
VIH | EN high level input voltage | 1.3 | V | ||||
VIL | EN low level input voltage | 0.4 | V | ||||
II | EN input leakage current | EN = GND or VIN | 0.1 | 1 | μA | ||
POWER SWITCH AND CURRENT LIMIT | |||||||
Vsw | Maximum switch voltage | 30 | V | ||||
toff | Minimum OFF time | 250 | 400 | 550 | ns | ||
ton | Maximum ON time | 4 | 6 | 7.5 | μs | ||
RDS(on) | MOSFET ON-resistance | VIN = 2.4 V; ISW = 200 mA; TPS61040-Q1 | 600 | 1100 | mΩ | ||
RDS(on) | MOSFET ON-resistance | VIN = 2.4 V; ISW = 200 mA; TPS61041-Q1 | 750 | 1300 | mΩ | ||
MOSFET leakage current | VSW = 28 V | 1 | 10 | μA | |||
ILIM | MOSFET current limit | TPS61040-Q1 | 325 | 400 | 500 | mA | |
ILIM | MOSFET current limit | TPS61041-Q1 | 200 | 250 | 325 | mA | |
OUTPUT | |||||||
VOUT | Adjustable output voltage range(2) | VIN | 28 | V | |||
Vref | Internal voltage reference | 1.233 | V | ||||
IFB | Feedback input bias current | VFB = 1.3 V | 1 | μA | |||
VFB | Feedback trip point voltage | 1.8 V ≤ VIN ≤ 6 V | TJ = –40°C to 85°C | 1.208 | 1.233 | 1.258 | V |
TJ = –40°C to 125°C | 1.2 | 1.233 | 1.27 | ||||
Line regulation (1) | 1.8 V ≤ VIN ≤ 6 V; VOUT = 18 V; Iload = 10 mA; CFF = not connected |
0.05 | %/V | ||||
Load regulation(1) | VIN = 2.4 V; VOUT = 18 V; 0 mA ≤ IOUT ≤ 30 mA | 0.15 | %/mA |
FIGURE | |||
---|---|---|---|
η | Efficiency | vs Load current | Figure 1, Figure 2, Figure 3 |
vs Input voltage | Figure 4 | ||
IQ | Quiescent current | vs Input voltage and temperature | Figure 5 |
VFB | Feedback voltage | vs Temperature | Figure 6 |
ISW | Switch current limit | vs Temperature | Figure 7 |
ICL | Switch current limit | vs Supply voltage, TPS61041-Q1 | Figure 8 |
vs Supply voltage, TPS61040-Q1 | Figure 9 | ||
RDS(on) | RDS(on) | vs Temperature | Figure 10 |
vs Supply voltage | Figure 11 | ||
Line transient response | Figure 13 | ||
Load transient response | Figure 14 | ||
Start-up behavior | Figure 15 |
The TPS6104x-Q1 is a high-frequency boost converter dedicated for small-to-medium LCD bias supply and white-LED backlight supplies. The device is ideal for generating output voltages up to 28 V from a dual-cell NiMH/NiCd or a single-cell device Li-Ion battery.
The internal switch turns on until the inductor current reaches the typical DC current limit (ILIM) of 400 mA (TPS61040-Q1) or 250 mA (TPS61041-Q1). Due to the internal propagation delay of typical 100 ns, the actual current exceeds the DC-current limit threshold by a small amount. The typical peak current limit can be calculated:
where
The higher the input voltage and the lower the inductor value, the greater the peak.
By selecting the TPS6104x-Q1, it is possible to tailor the design to the specific application current limit requirements. A lower current limit supports applications requiring lower output power and allows the use of an inductor with a lower current rating and a smaller form factor. A lower current limit usually has a lower output-voltage ripple as well.
All inductive step-up converters exhibit high inrush current during start-up if no special precaution is made. This can cause voltage drops at the input rail during start-up and may result in an unwanted or early system shutdown.
The TPS6104x-Q1 limits this inrush current by increasing the current limit in two steps starting from for 256 cycles to
for the next 256 cycles, and then full current limit (see Figure 15).
Pulling the enable (EN) to ground shuts down the device reducing the shutdown current to 1 µA (typical). Because there is a conductive path from the input to the output through the inductor and Schottky diode, the output voltage is equal to the input voltage during shutdown. The enable pin must be terminated and must not be left floating. Using a small external transistor disconnects the input from the output during shutdown as shown in Figure 17.
An undervoltage lockout prevents misoperation of the device at input voltages below typical 1.5 V. When the input voltage is below the undervoltage threshold the main switch is turned off.
An internal thermal shutdown is implemented and turns off the internal MOSFETs when the typical junction temperature of 168°C is exceeded. The thermal shutdown has a hysteresis of typically 25°C. This data is based on statistical means and is not tested during the regular mass production of the IC.
The TPS6104x-Q1 operates with an input voltage range of 1.8 V to 6 V and can generate output voltages up to 28 V. The device operates in a pulse frequency modulation (PFM) scheme with constant peak current control. This control scheme maintains high efficiency over the entire load current range, and with a switching frequency up to 1 MHz, the device enables the use of very small external components.
The converter monitors the output voltage, and as soon as the feedback voltage falls below the reference voltage of typically 1.233 V, the internal switch turns on and the current ramps up. The switch turns off as soon as the inductor current reaches the internally set peak current of typically 400 mA (TPS61040-Q1) or 250 mA (TPS61041-Q1). See Peak Current Control for more information. The second criteria that turns off the switch is the maximum ON-time of 6 µs (typical). This is just to limit the maximum ON-time of the converter to cover for extreme conditions. As the switch is turned off, the external Schottky diode is forward biased delivering the current to the output. The switch remains off for a minimum of 400 ns (typical), or until the feedback voltage drops below the reference voltage again. Using this PFM peak-current control scheme, the converter operates in discontinuous conduction mode (DCM) where the switching frequency depends on the output current, which results in high efficiency over the entire load current range. This regulation scheme is inherently stable, allowing a wider selection range for the inductor and output capacitor.