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SM8150A Arkusz danych(PDF) 1 Page - Nippon Precision Circuits Inc |
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SM8150A Arkusz danych(HTML) 1 Page - Nippon Precision Circuits Inc |
1 / 22 page SM8150A SEIKO NPC CORPORATION —1 PMIC with White LED Driver 1. OVERVIEW The SM8150A is a charge pump type white LED driver, with 2-system programmable LDOs (Low Dropout Regulator), and step-down DC/DC converter power management IC. The white LED driver provides constant- current drive for 1 to 6 backlight white LED connected in parallel and 1 torch/strobe white LED. The charge pump automatically selects between ×1 mode, ×1.5 boost mode, and ×2 boost mode in response to battery volt- age, LED drive current, and VFLED (LED forward bias voltage drop) conditions in order to extend battery drive life. The SM8150A operating mode settings are accessed using an I2C*1 interface, allowing LED drive current, LDO voltage, output ON/OFF, and other settings to be controlled from a microcontroller. *1. I2C-BUS is a registered trademark of NXP B. V. 2. FEATURES I Optimum specifications for clamshell cellular phone with camera • LCD backlight: Main-4ch/Sub-2ch (max 25mA/ch) • Camera flash: 1ch (max 300mA) I Power saving design by automatic mode selection of charge pump • Power at ×1.5 mode is reduced by 25% from×2 mode • Power at ×1 mode is reduced by 50% from ×2 mode, 33% from ×1.5 mode I I2C interface best match for cellular phone chipset I Selecting current value (torch/strobe) of flash LED by SBN pin I Shutdown synchronized to microcontroller supply by VEN pin I 1 system of step-down DC/DC converter built-in • Output: 1.2 to 3.0V@ max 500mA I 2 systems of programmable LDO built-in • Output: 1.5/1.8/2.5/2.6/2.8/3.0/3.1/3.3V@ max 300mA I Various protection circuits built-in • Startup soft start circuit built-in • Overtemperature thermal shutdown (TSD) cir- cuit built-in • Supply undervoltage lockout (UVLO) circuit built-in I Supply voltage range (VIN1 to VIN3) : 2.7 to 4.6V Logic operating voltage range (VEN) : 1.8 to 4.6V I White LED Driver • Charge-pump frequency: 1.0MHz (typ) • Charge-pump maximum output current: 450mA • Backlight LED current: 25 ± 1.5mA/ch (max) • Backlight LED relative accuracy: ± 3% • Flash LED current: 300 ± 20mA (max) I DC/DC converter • DC/DC converter output voltage: 1.2 to 3.0V (typ) • DC/DC converter output current: 500mA (max) • DC/DC converter operating frequency: 2.0MHz (typ) • DC/DC converter voltage accuracy: ± 2% I LDO • LDO output voltage: 1.5 to 3.3V (VIN = 3.6V) • LDO output current: 300mA (max) • LDO dropout voltage: 0.1V (typ) • LDO voltage accuracy: ± 2% I Package: 28-pin QFN 3. TYPICAL APPLICATION CIRCUIT 4. APPLICATIONS I Cellular phone I Mobile equipment 5. ORDERING INFORMATION Device Package SM8150AB 28-pin QFN 4.7 µF SDA SCL VOUT DIN1 DIN2 DIN3 DIN4 DIN5 DIN6 LDOUT1 DIN7 VEN LX FB LDOUT2 DCOUT (1.8V) VIN1 LDO1 output LDO2 output 2.2 µF 2.2 µF 2.2 µH 2.2 µF 8pF 200k Ω 100k Ω PGND1 2.2 µF VIN2 PGND2 2.2 µF VIN3 3.6V 2.2 µF 0.1 µF Logic supply VREF SBN Strobe ON/OFF SM8150A 0.1 µF I C 2 C1P C1M C2P C2M 1 µF1µF GND1 GND2 |
Podobny numer części - SM8150A |
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Podobny opis - SM8150A |
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