(AAT3192 / AAT3193) 2-/3-Channel Charge-Pump LED Drivers

AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers General Description The AAT3192 and AAT3193 are charge-pump based, current-sink white LED drivers capable of driving one to three LEDs up to 30mA, each. They automatically switch between 1x mode and 2x mode to maintain the highest efficiency and optimal LED current accuracy and matching. The AAT3192/93 charge pump’s 1x mode (bypass mode) has very low resistance allowing LED current regulation to be maintained with input supply voltage approaching the LED forward voltage. The AAT3192 and the AAT3193 are available in a 2x2mm 10-lead SC70JW-10 packages. Features • • • • ChargePump™ • • • • • • Drives up to 3 LEDs at up to 30mA, each Automatic Switching Between 1x and 2x Modes 0.9MHz Switching Frequency Linear LED Output Current Control — Single-wire, S2Cwire Interface • AAT3192/93-1: 16-step • AAT3192/93-2: 8-step • AAT3192/93-3: 4-step — ON/OFF or PWM Interface • AAT3192/93-4 ±10% LED Output Current Accuracy ±3% LED Output Current Matching Low-current Shutdown Mode Built-in Thermal Protection Automatic Soft-start Available in 2x2mm SC70JW-10 Package Applications www.DataSheet4U.com • • • • Low-cost Low-cost Low-cost Low-cost Cordless Phone Handsets Digital Cameras Mobile Phone Handsets MP3 and PMP Players Typical Application Input Voltage 2.7V to 5.5V C IN 1μF IN C+ OUT Input Voltage 2.7V to 5.5V C IN 1μF IN C+ OUT CP 1μF AAT3192-1 CEN/SET RSET GND D1 D2 C OUT 1μF CP 1μF AAT3193-1 C- COUT 1μF WLEDs OSRAM LW M 678 or equivalent EN/SET S 2Cwire Interface R SET 14.3kΩ WLEDs OSRAM LW M 678 or equivalent EN/SET S 2Cwire Interface EN/SET D1 D2 RSET GND D3 RSET 14.3kΩ 3193.2007.05.1.0 1 AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers Pin Descriptions Symbol Pin 1 AAT3192 AAT3193 Description AAT3192: No connection. AAT3193: LED1 current sink input. D1 is the input of LED1 current sink. Connect LED1’s anode to OUT and its cathode to D1. Charge pump output. OUT is the output of the charge pump. Bypass OUT to GND with a 1μF or larger ceramic capacitor. Charge pump capacitor negative node. Charge pump capacitor positive node. Connect a 1μF ceramic capacitor between C+ and C-. Power source input. Connect IN to the power source, typically the battery. Bypass IN to GND with a 1μF or larger ceramic capacitor. LED enable and serial control input. EN/SET is the ON/OFF control for the LED and the S2Cwire digital input for the AAT3192/93-1/-2/-3 to control serially the LED brightness according to the maximum current set by RSET. LED ON/OFF and PWM control input. This logic input controls the LED outputs for the AAT3192/93-4. Alternatively, a PWM signal from a GPIO or an equivalent signal from a separate controller can be used to control LED output current linearly. A PWM signal, ranging from 10% to 100% duty cycle, controls the LED current linearly between ZS and FS. A 1% tolerance resistor from this pin to GND sets the maximum LED current level. For optimal LED output current accuracy and matching in the AAT3192/93-1/-2/-4, a 14.3kΩ resistor sets each full-scale output current to 20mA, maximum. For the AAT3192/93-3, a 10.7kΩ resistor is recommended. Ground. Connect this pin to the system’s ground plane. AAT3192: LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect LED2’s anode to OUT and its cathode to D2. AAT3193: LED3 Current Sink Input. D3 is the input of LED3 current sink. Connect LED3’s anode to OUT and its cathode to D3. AAT3192: LED1 Current Sink Input. D1 is the input of LED1 current sink. Connect LED1’s anode to OUT and its cathode to D1. AAT3193: LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect LED2’s anode to OUT and its cathode to D2. N/C D1 2 3 4 5 OUT CC+ IN EN/SET (AAT3192/93-1/ -2/-3) 6 EN/PWM (AAT3192/93-4) 7 RSET 8 GND 9 D2 D3 10 D1 D2 Pin Configuration AAT3192 SC70JW-10 (Top View) N/C OUT CC+ IN 1 2 3 4 5 10 9 8 7 6 AAT3193 SC70JW-10 (Top View) D1 D2 GND RSET EN/SET D1 OUT CC+ IN 1 2 3 4 5 10 9 8 7 6 D2 D3 GND RSET EN/SET 2 3193.2007.05.1.0 AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers Part Number Descriptions Part Number AAT3192IJQ-1 AAT3192IJQ-2 AAT3192IJQ-3 AAT3192IJQ-4 AAT3193IJQ-1 AAT3193IJQ-2 AAT3193IJQ-3 AAT3193IJQ-4 Interface S2Cwire S2Cwire S2Cwire PWM S2Cwire S2Cwire S2Cwire PWM Current Control, Inverting 16-step 8-step 4-step Linear 16-step 8-step 4-step Linear Absolute Maximum Ratings1 Symbol Description IN, C+, C-, OUT, D1, D2, D3, and RSET Pin Voltages to GND EN/SET or EN/PWM Pin Voltage to GND Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec) Value -0.3 to 6.0 -0.3 to VIN + 0.3 -40 to 150 300 Units V V °C °C Thermal Information Symbol PD θJA Description Maximum Power Dissipation Maximum Thermal Resistance2 2, 3 Value 625 160 Units mW °C/W 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 circuit board. 3. Derate 6.25mW/°C above 40°C ambient temperature. 3193.2007.05.1.0 3 AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers Electrical Characteristics1 IN = EN = 3.6V; CIN = 1µF; COUT = 1µF; CCP = 1µF; RSET = 14.3kΩ; TA =-40°C to 85°C unless otherwise noted. Typical values are at TA = 25°C. Symbol Description Conditions Min 2.7 EN = IN, ID1 = ID2 = ID3 = OFF (WLED Test Mode) EN = IN, ID1 = ID2 = ID3 = FS Operating, ID1 = ID2 = ID3= OPEN; IN = 5V EN/SET or EN/PWM = GND 100 0.9 115 150 19.6 ±3 1.3 1.3 2.5 150 Typ Max 5.5 5 1.5 4.5 1 Units V mA mA mA μA mA MHz mV μs mA % mA mA mA mV Input Power Supply IN Input Voltage Range IIN Input Operating Current IIN(SHDN) Input Shutdown Current Charge Pump Section IOUT OUT Maximum Output Current fOSC Charge Pump Oscillator Frequency VIN_(TH) Charge Pump Mode Hysteresis tOUT Output Start-Up Time AAT3192/93-1/-2/-4: LED Current Sink Outputs ID_(MAX) D1 - D3 Current Accuracy ΔID_(MAX) D1 - D3 Current Matching D1 - D3 Current Accuracy ID_(DATA15) (AAT3192/93-1 only) D1 - D3 Current Accuracy ID_(DATA8) (AAT3192/93-2 only) D1 - D3 Current Accuracy ID_(10%) (AAT3192/93-4 only) D1- D3 Charge Pump Mode VD_(TH) Transition Threshold 0.65 ID1 = ID2 = ID3= 20mA EN/SET or EN/PWM = IN DATA = 1; VIN - VF = 1.5V DATA = 1; VIN - VF = 1.5V DATA = 15; VIN - VF = 1.5V DATA = 8; VIN - VF = 1.5V DC = 10%; VIN - VF = 1.5V ID1 = ID2 = ID3 = 20mA 17.6 1.15 250 21.6 1.0 1.0 1.56 1.56 1. The AAT3192/93 are guaranteed to meet performance specification over the -40°C to 85°C operating temperature range and are assured by design, characterization and correlation with statistical process controls. 4 3193.2007.05.1.0 AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers Electrical Characteristics1 IN = EN = 3.6V; CIN = 1µF; COUT = 1µF; CCP = 1µF; RSET = 14.3kΩ; TA =-40°C to 85°C unless otherwise noted. Typical values are at TA = 25°C. Symbol Description Conditions RSET = 10.7kΩ; DATA = 1; VIN - VF = 1.5V RSET = 10.7 kΩ; DATA = 1; VIN - VF = 1.5V RSET = 10.7kΩ; DATA = 4; VIN - VF = 1.5V RSET = 10.7kΩ; ID1 = ID2 = ID3 = 20mA Min Typ Max Units AAT3192/93-3: LED Current Sink Outputs ID_(MAX) ΔID_(MAX) ID_(DATA4) VD_(TH) D1 - D3 Current Accuracy D1 - D3 Current Matching D1 - D3 Current Accuracy 17.6 19.6 ±3 0.72 0.9 150 1.1 21.6 mA % mA mV D1- D3 Charge Pump Mode Transition Threshold AAT3192/93-1/-2/-3: EN/SET and S2Cwire Control VENH EN Input High Threshold Voltage VENL EN Input Low Threshold Voltage IEN(LKG) EN Input Leakage Current tEN/SET(OFF) EN/SET Input OFF Timeout tEN/SET(LAT) EN/SET Input Latch Timeout tEN/SET(LOW) EN/SET Input LOW Time tENSET(H-MIN) EN/SET Minimum High Time tENSET(H-MAX) EN/SET Maximum High Time AAT3192/93-4: EN/PWM Current Control VENH EN/PWM Input High Threshold Voltage VENL EN/PWM Input Low Threshold Voltage IEN(LKG) EN/PWM Input Leakage Current tPWM(ON) PWM Control Turn-on Delay tEN/PWM EN/PWM Input OFF Timeout fPWM PWM Control Frequency 1.4 EN/SET = IN = 5V -1 0.4 1 500 500 75 50 75 1.4 EN/PWM = IN = 5V -1 2 0.15 Duty Cycle = 80% 1 50 0.4 1 0.3 V V μA µs µs µs ns µs V V μA µs ms kHz 1. The AAT3192/93 are guaranteed to meet performance specification over the -40°C to 85°C operating temperature range and are assured by design, characterization and correlation with statistical process controls. 3193.2007.05.1.0 5 AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers Typical Characteristics Operating Current (No Load) vs. Input Voltage 3.60 3.50 3.40 0.010 0.008 Shutdown Current vs. Temperature IQ (mA) 85°C 25°C IIN(SHDN) (µA) 0.006 0.004 0.002 0.000 -40 3.30 3.20 3.10 3.00 -45°C 2.7 3.1 3.5 3.9 4.3 0°C 4.7 5.1 5.5 -15 10 35 60 85 VIN (V) Temperature (°C) ° Efficiency vs. Input Voltage 100% 90% 80% 21.0 20.5 Current Matching vs. Temperature D2 Efficiency (%) 70% 60% 50% 40% 30% 20% 10% 0% 2.7 3.1 Current (mA) 20.0 19.5 19.0 18.5 18.0 -40 30mA VF = 3.8V 10mA VF = 3.2V 3.5 3.9 20mA VF = 3.5V 4.3 4.7 5.1 5.5 D3 D1 -15 10 35 60 85 Input Voltage (V) Temperature (°C) Turn On to 2X Mode (20mA/ch) Turn Off from 2X Mode (20mA/ch) EN/SET (2V/div) VOUT (2V/div) VSINK (2V/div) IIN (200mA/div) EN/SET (2V/div) VOUT (1V/div) IIN (200mA/div) Time (200µs/div) Time (200µs/div) 6 3193.2007.05.1.0 AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers Typical Characteristics Turn On to 1X Mode (VIN = 4.2V; 20mA/ch) 32 Maximum LED Current vs RSET EN/SET (2V/div) ILED (mA) 28 24 20 16 12 8 4 0 8 13 18 23 28 33 VF (2V/div) VSINK (2V/div) IIN (200mA/div) Time (200µs/div) RSET (kΩ) Ω EN Input High Threshold Voltage vs. Input Voltage 1.2 1.0 1.2 1.0 EN Input Low Threshold Voltage vs. Input Voltage VENH (V) 0.8 0.6 0.4 0.2 2.7 25°C 85°