DATA SHEET
TPS6116xA White LED Driver with PWM Brightness Control in 2-mm x 2-mm WSON Package
1 Features
- Input Voltage Range: 2.7 V to 18 V
- 26-V Open LED Protection for TPS61160A
38-V Open LED Protection for TPS61161A - 200mV Reference Voltage With ±2% Accuracy
- PWM Interface for Brightness Control
- Built-in Soft Start
- Up to 90% Efficiency
- 2-mm × 2-mm × 0.8-mm 6-Pin WSON Package With Thermal Pad
2 Applications
- Cellular Phones
- Portable Media Players
- Ultra Mobile Devices
- GPS Receivers
- White LED Backlighting for Media Form Factor Display
3 Description
With a 40-V rated integrated switch FET, the TPS61160A/61A is a boost converter that drives LEDs in series. The boost converter runs at 600-kHz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use of small external components.
The default white LED current is set with the external sensor resistor Rset, and the feedback voltage is regulated to 200 mV, as shown in the typical application. During the operation, the LED current can be controlled by a pulse width modulation (PWM) signal applied to the CTRL pin through which the duty cycle determines the feedback reference voltage. In PWM dimming mode, the TPS61160A/61A does not burst the LED current; therefore, it does not generate audible noises on the output capacitor. For maximum protection, the device features integrated open LED protection that disables the TPS61160A/61A to prevent the output from exceeding the absolute maximum ratings during open LED conditions.
The TPS61160A/61A is available in a space-saving, 2-mm × 2-mm WSON package with thermal pad.
Device Information(1)
| PART NUMBER | PACKAGE | OPEN LED PROTECTION |
|---|---|---|
| TPS61160A | WSON (6) | TPS61160A use 26 V (typical) |
| TPS61161A | TPS61161A use 38 V (typical) |
- For all available packages, see the orderable addendum at the end of the data sheet.
Typical Application of TPS61161A
4 Revision History
Changes from B Revision (October 2014) to C Revision
- Changed Handling Ratings to ESD Ratings; moved storage temperature to Abs Max tableGo
- Deleted the "Duty" rows the Recommended Operating Conditions; added "tPWM_MIN" rowGo
- Added Receiving Notification of Documentation Updates and Community ResourcesGo
Changes from A Revision (July 2011) to B Revision
- Added Device Information and Handling Rating tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section; change "QFN" to "SON"Go
- Changed (reversed) the Vi=5V and Vi=3.6V characteristic labels in Figure 3Go
Changes from * Revision (March 2009) to A Revision
- Deleted "6 LEDs" and "10 LEDs" from the second feature bullet for TPS61160A and TPS61161A Open-LED Protection, respectively.Go
- Deleted "for up to 10 LEDs in Series" from titleGo
- Added "38V Max" to Typical Application of TPS61161A, top of LED string.Go
- Changed from "...for driving up to 10 white LED" to "...for driving white LED" in first sentence of OPERATION section.Go
- Changed text of last sentence in "OPEN LED PROTECTION" section to clarify circuit description.Go
- Changed Figure 11 to show separate terminals for COMP and FBGo
- Changed Li-Ion Driver for 6 White LEDs With External PWM Dimming Network to clarify schematicGo
5 Pin Configuration and Functions
DRV Package
6-Pin WSON With Thermal Pad
Top View
Pin Functions
| PIN | I/O | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| COMP | 2 | O | Output of the transconductance error amplifier. Connect an external capacitor to this pin to compensate the regulator. |
| CTRL | 5 | I | Control pin of the boost regulator. Enable and disable device. PWM signal can be applied to the pin for LED brightness dimming as well. |
| FB | 1 | I | Feedback pin for current. Connect the sense resistor from FB to GND. |
| GND | 3 | O | Ground |
| SW | 4 | I | This is the switching node of the IC. Connect the inductor between the VIN and SW pin. This pin is also used to sense the output voltage for open LED protection |
| VIN | 6 | I | The input supply pin for the IC. Connect VIN to a supply voltage between 2.7 V and 18 V. |
| Thermal Pad | The thermal pad should be soldered to the analog ground plane. If possible, use thermal via to connect to ground plane for ideal power dissipation. | ||
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| VI | Supply voltages on VIN(2) | –0.3 | 20 | V |
| Voltages on CTRL(2) | –0.3 | 20 | V | |
| Voltage on FB and COMP(2) | –0.3 | 3 | V | |
| Voltage on SW(2) | –0.3 | 40 | V | |
| PD | Continuous power dissipation | See Dissipation Ratings | ||
| TJ | Operating junction temperature | –40 | 150 | °C |
| Tstg | Storage temperature | –65 | 150 | °C |
(1) 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.
6.2 ESD Ratings
| MIN | MAX | UNIT | |||
|---|---|---|---|---|---|
| V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) | 4000 | V | |
| Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) | 1000 | ||||
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| VI | Input voltage, VIN | 2.7 | 18 | V | |
| VO | Output voltage | VIN | 38 | V | |
| L | Inductor(1) | 10 | 22 | μH | |
| fdim | PWM dimming frequency(2) | 5 | 100 | kHz | |
| tPWM_MIN | Minimum pulse width at PWM input | 50 | ns | ||
| CIN | Input capacitor | 1 | μF | ||
| CO | Output capacitor(1) | 0.47 | 10 | μF | |
| TA | Operating ambient temperature | –40 | 85 | °C | |
| TJ | Operating junction temperature | –40 | 125 | °C |
(1) These values are recommended values that have been successfully tested in several applications. Other values may be acceptable in other applications but should be fully tested by the user.
(2) The device can support the frequency range from 1 kHz to 5 kHz, based on the specification, toff . The output ripple needs to be considered in the range of 1 kHz to 5 kHz.
6.4 Thermal Information
| THERMAL METRIC(1) | TPS61160A, TPS61161A | UNIT | |
|---|---|---|---|
| DRV (WSON) | |||
| 6 PINS | |||
| RθJA | Junction-to-ambient thermal resistance | 140 | °C/W |
| RθJC(top) | Junction-to-case (top) thermal resistance | 20 | |
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
6.5 Dissipation Ratings
| BOARD PACKAGE | RθJC | RθJA | DERATING FACTOR ABOVE TA = 25°C | TA < 25°C | TA = 70°C | TA = 85°C |
|---|---|---|---|---|---|---|
| Low-K(1)DRV | 20°C/W | 140°C/W | 7.1 mW/°C | 715 mW | 395 mW | 285 mW |
| High-K (2)DRV | 20°C/W | 65°C/W | 15.4 mW/°C | 1540 mW | 845 mW | 615 mW |
(1) The JEDEC low-K (1s) board used to derive this data was a 3 in × 3 in, two-layer board with 2-ounce copper traces on top of the board.
(2) The JEDEC high-K (2s2p) board used to derive this data was a 3 in × 3 in, multilayer board with 1-ounce internal power and ground planes and 2-ounce copper traces on top and bottom of the board.
6.6 Electrical Characteristics
VIN = 3.6 V, CTRL = VIN; for Min/Max values TA = –40°C to 85°C, typical values are at TA = 25°C (unless otherwise noted)| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| SUPPLY CURRENT | ||||||
| VI | Input voltage range, VIN | 2.7 | 18 | V | ||
| IQ | Operating quiescent current into VIN | Device PWM switching no load | 1.8 | mA | ||
| ISD | Shutdown current | CRTL = GND, VIN = 4.2 V | 1 | μA | ||
| UVLO | Undervoltage lockout threshold | VIN falling | 2.2 | 2.5 | V | |
| Vhys | Undervoltage lockout hysteresis | 70 | mV | |||
| ENABLE AND REFERENCE CONTROL | ||||||
| V(CTRLh) | CTRL logic high voltage | VIN = 2.7 V to 18 V | 1.2 | V | ||
| V(CTRLl) | CTRL logic low voltage | VIN = 2.7 V to 18 V | 0.4 | V | ||
| R(CTRL) | CTRL pull down resistor | 400 | 800 | 1600 | kΩ | |
| toff | CTRL pulse width to shutdown | CTRL high to low | 2.5 | ms | ||
| VOLTAGE AND CURRENT CONTROL | ||||||
| VREF | Voltage feedback regulation voltage | 196 | 200 | 204 | mV | |
| V(REF_PWM) | Voltage feedback regulation voltage under brightness control | VFB = 50 mV | 47 | 50 | 53 | mV |
| VFB = 20 mV | 17 | 20 | 23 | |||
| IFB | Voltage feedback input bias current | VFB = 200 mV | 2 | μA | ||
| fS | Oscillator frequency | 500 | 600 | 700 | kHz | |
| Dmax | Maximum duty cycle | VFB = 100 mV | 90% | 93% | ||
| tmin_on | Minimum on pulse width | 40 | ns | |||
| Isink | Comp pin sink current | 100 | μA | |||
| Isource | Comp pin source current | 100 | μA | |||
| Gea | Error amplifier transconductance | 240 | 320 | 400 | μmho | |
| Rea | Error amplifier output resistance | 6 | MΩ | |||
| fea | Error amplifier crossover frequency | 5 pF connected to COMP | 500 | kHz | ||
| POWER SWITCH | ||||||
| RDS(on) | N-channel MOSFET on-resistance | VIN = 3.6 V | 0.3 | 0.6 | Ω | |
| VIN = 3 V | 0.7 | |||||
| ILN_NFET | N-channel leakage current | VSW = 35 V, TA = 25°C | 1 | μA | ||
| OC and OLP | ||||||
| ILIM | N-Channel MOSFET current limit | D = Dmax | 0.56 | 0.7 | 0.84 | A |
| ILIM_Start | Start up current limit | D = Dmax | 0.4 | A | ||
| tHalf_LIM | Time step for half current limit | 5 | ms | |||
| Vovp | Open LED protection threshold | Measured on the SW pin, TPS61160A TPS61161A |
25 37 |
26 38 |
27 39 |
V |
| V(FB_OVP) | Open LED protection threshold on FB | Measured on the FB pin, percentage of Vref, Vref = 200 mV and 20 mV |
50% | |||
| tREF | VREF filter time constant | 180 | μs | |||
| tstep | VREF ramp up time | 213 | μs | |||
| THERMAL SHUTDOWN | ||||||
| Tshutdown | Thermal shutdown threshold | 160 | °C | |||
| Thysteresis | Thermal shutdown threshold hysteresis | 15 | °C | |||
6.7 Typical Characteristics
Table 1. Table of Graphs
| FIGURE | ||
|---|---|---|
| Efficiency TPS61160A/61A | VIN = 3.6 V; 4, 6, 8, 10 LEDs; L = 22 μH | Figure 1 |
| Efficiency TPS61160A | Figure 2 | |
| Efficiency TPS61161A | Figure 3 | |
| Current limit | TA = 25°C | Figure 4 |
| Current limit | Figure 5 | |
| PWM dimming linearity | VIN = 3.6 V; PWM Freq = 10 kHz and 40 kHz | Figure 6 |
| Output ripple at PWM dimming | 8 LEDs; VIN = 3.6 V; ILOAD = 20 mA; PWM Freq = 10 kHz | Figure 7 |
| Switching waveform | 8 LEDs; VIN = 3.6 V; ILOAD = 20 mA; L = 22 μH | Figure 8 |
| Start-up | 8 LEDs; VIN = 3.6 V; ILOAD = 20 mA; L =22 μH | Figure 9 |
| Open LED protection | 8 LEDs; VIN = 3.6 V; ILOAD = 20 mA; L = 22 μH | Figure 10 |
Figure 1. Efficiency vs Output Current
Figure 2. Efficiency vs Output Current
Figure 4. Switch Current Limit vs Duty Cycle
