Surface-Mount Photo-IC for Ambient Light Sensor : TPS859
The TPS859 is an ultra-compact surface-mount photo-IC for illuminance sensors that incorporates a photodiode and current amplifier in a single chip. The TPS859 features a higher sensitivity and a reduced sensitivity variation compared to phototransistors.
Since the TPS859 has spectral sensitivity close to that of human eyes, it provides an excellent linearity output proportional to the ambient brightness. With its ultra-compact surface-mount package, the TPS859 can be used not only for large applications such as flat panel displays (backlight control) and various home appliances (power-saving control), but also for small applications such as cell phones and digital cameras (backlight control for displays). The TPS859 contributes to power saving in various applications and also improves visibility of LED displays.
Features
- Ultra-compact and light surface-mount package: 1.6 × 1.6 × 0.55 mm
- Excellent output linearity of illuminance
- High sensitivity and little fluctuation in light current:
- IL = 230 μA (typ.) @EV = 100 lx using fluorescent light
- Light current variation width: × 1.67 (when light current is specified.)
- Little temperature fluctuation
- Reduced luminous sensitivity variation across various light sources with a new filter technology:
- IL (@incandescent light) / IL (@fluorescent light) = 1.0 (typ.)
- Low supply voltage, allowing the TPS859 to be used for batter-powered equipment:
- Operating voltage = 1.8 V to 5.5 V
- RoHS-compatible
Applications
- Flat panel displays
- Cell phones
- Notebook PCs, PDAs
- Camcorders, digital cameras
- Other equipment requiring luminosity adjustment
Package Details
Main Specification
| Min | Typ. | Max | |
|---|---|---|---|
| Supply voltage(VCC) | 1.8 V | - | 5.5 V |
| Operating voltage(Topr) | -30 °C | - | 85 °C |
| Supply voltage (VCC) | -0.5 V to 6 V |
|---|---|
| Output voltage (VOUT) | ≤ VCC V |
| Light current (IL) | 4 mA |
| Power dissipation (P) | 30 mW |
| Power dissipation derating (Ta > 25°C) (ΔP /°C) |
-0.4 mW /°C |
| Operating temperature (Topr) | -30 °C to 85 °C |
| Storage temperature (Tstg) | -40 °C to 100 °C |
| Soldering temperature (Tsol) | 260 °C |
- ※ Ta = 25°C
| Characteristics | Symbol | Test Condition | Min | Typ. | Max | |
|---|---|---|---|---|---|---|
| Supply voltage | VCC | - | 1.8 V | - | 5.5 V | |
| Supply current | ICC(1) | VCC = 3 V, EV = 1000 lx RL = 1 kΩ (Note1) |
- | 2300 μA | - | |
| Light current 1 | IL(1) | VCC = 3 V, EV = 100 lx (Note1) |
- | 230 μA | - | |
| Light current 2 | IL(2) | VCC = 3V, EV = 10 lx (Note2) |
16 μA | 23 μA | 32 μA | |
| Light current 3 | IL(3) | - | VCC = 3 V, EV = 100 lx (Note2) |
160 μA | 230 μA | 320 μA |
| Rank A | 180 μA | 230 μA | 300 μA | |||
| Light current ratio | IL(1) / L(3) | - | - | 1.0 | - | |
| Dark current | ILEAK | VCC = 3 V, EV = 0 |
- | - | 0.2 μA | |
| Saturation output voltage | VO | VCC= 3 V, RL = 75 kΩ, EV = 100 lx (Note2) |
2.2 V | 2.35 V | 2.6 V | |
| Switching time | Rise time | tr | VCC = 3 V, RL = 5 kΩ |
- | 150 μs | - |
| Fall time | tf | - | 300 μs | - | ||
| Delay time | td | - | 180 μs | - | ||
| Storage time | ts | - | 8 μs | - | ||
- Note1: A CIE standard A light source is used (color temperature = 2856 K, approximated incandescent light).
- Note2: A fluorescent light (F10, color temperature = 5000 K) is used as a light source. However, a white LED is substituted in a mass-production process.
- ※ Ta = 25°C
- ※Please refer to the latest datasheet for more details. →datasheet of TPS859