AAT2801 AAT, AAT2801 Datasheet
AAT2801
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AAT2801 Summary of contents
Page 1
... General Description The AAT2801 is a member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family. It has a dual charge pump architecture designed to support both the white LED backlight and flash appli- cations for systems operating with Lithium-Ion bat- teries. The backlight charge pump provides power required to drive up to four LEDs ...
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Pin Descriptions Pin # Symbol Function 1 C3- Flying capacitor 3 negative terminal. Connect a 1µF capacitor between C3- and C3+. 2 C3+ Flying capacitor 3 positive terminal. 3 OUT_FLASH Flash output voltage. Requires 1µF capacitor connected between this pin ...
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Absolute Maximum Ratings Symbol Description V Input Voltage IN V EN/SET to GND Voltage EN/SET I Maximum DC Output Current 2 OUT T Operating Junction Temperature Range J Thermal Information Symbol Description P Maximum Power Dissipation D θ Thermal Resistance ...
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... LAT I Input Leakage EN/SET/EN_FLSH 1. The AAT2801 is guaranteed to meet performance specifications over the -40°C to 85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. Codes 2 through 7 are guaranteed to be within ±15% of stated current level. 3. Current matching is defined as I ...
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Typical Characteristics–White LED Backlight Driver Section V = 3.5V 2.2µ 1.0µ Efficiency vs. V (Code 26) 100 90 3. 2.9 3.0 ...
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Typical Characteristics–White LED Backlight Driver Section V = 3.5V 2.2µ 1.0µ Turn- Mode (4x19mA Load) EN/SET (2V/div (4V/div) V DIODE (2V/div (100mA/div) ...
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Typical Characteristics–White LED Backlight Driver Section V = 3.5V 2.2µ 1.0µ Charge Pump to Load Switch (1.5X Mode; 4x19mA Load (500mV/div (1V/div) V DIODE ...
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Typical Characteristics–White LED Backlight Driver Section V = 3.5V 2.2µ 1.0µ Line Response (1X Mode; 4x19mA Load (0.5V/div) V LED (20mV/div (0.5V/div ...
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Typical Characteristics–White LED Backlight Driver Section V = 3.5V 2.2µ 1.0µ Operating Characteristics (I_D = 4x15mA; 1.5X Mode (20mV/div (10mA/div (20mV/div) ...
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Typical Characteristics–White LED Backlight Driver Section V = 3.5V 2.2µ 1.0µ Diode Current vs. Input Voltage (30mA; 15mA settings 3.4V DIODE ...
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Typical Characteristics–Flash Driver Charge Pump Section V = 3.5V 2.2µ Output Voltage vs. Output Current 5.0 4.8 4.6 4.4 4.2 4.0 3 2.7 IN 3.6 3.4 3.2 3.0 0 ...
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Typical Characteristics–Flash Driver Charge Pump Section V = 3.5V 2.2µ Startup ENABLE (1V/div 150mA @ V LOAD I = 100mA @ V = 3.0V LOAD LOAD ...
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... Functional Block Diagram EN_FLSH IN EN/SET Functional Description The AAT2801 is a dual charge pump for white LED and flash applications. The charge pump for white LED application is a tri-mode load switch (1X) and high efficiency (1.5X or 2X) charge pump device intended for white LED backlight applications ...
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... This feature greatly reduces the burden on a microcontroller or system IC to manage LED or display brightness, allowing the user to "set it and forget it." With its high-speed serial interface (1MHz data rate), the output current of the AAT2801 can be ), one 1µF changed successively to brighten or dim LEDs and smooth transitions (e ...
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... LED Selection The AAT2801 is specifically intended for driving white LEDs. However, the device design will allow the AAT2801 to drive most types of LEDs with for- ward voltage specifications ranging from 2.0V to 4.3V. Since the output current sources are matched with negligible voltage dependence, ...
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... Multi-Mode Charge Pump for White LED Backlight and Flash Applications Load Switch Mode Efficiency The AAT2801 load switch mode is operational at all times and functions alone to enhance device power conversion efficiency when the condition exists where V is greater than voltage across the load IN connected to the constant current source outputs ...
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... LED driver applications in portable products. 4.5V flash output (OUT_FLSH) version of the AAT2801 should be selected for photo flash LED applications can maintain better voltage regu- lation at higher pulsed load current levels (refer to Figure 1). The limitation of this option is that the ...
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... V = Flash LED forward voltage at the F desired forward current I = Desired flash LED forward current F The flash LED function can be controlled by the AAT2801 flash enable (EN_FLSH) pin in most 18 Multi-Mode Charge Pump for White LED Backlight and Flash Applications C 3 1μF C3+ C3- 4.5V OUT_FLSH ...
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... Regulated charge pump output voltage OUT (typically 4.5V Flash LED forward voltage at the F desired forward current I = Desired flash LED forward current F 2801.2006.04.1.3 Multi-Mode Charge Pump for White LED Backlight and Flash Applications C 3 1μF C3+ C3- 4.5V IN OUT_FLSH C OUT 1μF AAT2801 EN_FLSH DS Flash LED ...
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... Option A: Option B: C0.30 (4x) max R0.30 (4x) max Chamfered corner Round corner Detail "A" Multi-Mode Charge Pump for Part Number (Tape and Reel) 2 AAT2801IXN-4.5-T1 AAT2801IXN-5.0-T1 Detail "B" 0.3 ± 0.10 0.375 ± 0.125 0.16 Pin 1 Indicator (optional) Detail "B" 2801.2006.04.1.3 0.075 ± 0.075 0.1 REF ...