AAT1232 Advanced Analog Technology, Inc., AAT1232 Datasheet
AAT1232
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AAT1232 Summary of contents
Page 1
... The fully integrated control IC simplifies the design while reducing the total PCB footprint. The AAT1232 offers a true load dis- connect feature which isolates the load from the power source when EN/SET is pulled low. This eliminates leakage current and maintains zero volt- age at the output while disabled ...
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... Exposed paddle (bottom). Internally connected to SW. May be exter- nally connected to SW pins or left floating. Do not connect to GND or PGND. LIN FB1 FB2 GND PGND PGND PGND SW PGND AAT1232 Cwire control uti- 2 Cwire control. See Tables 1 and 2. 2 Cwire 2 TDFN34-16 (Top View) VP LIN 1 ...
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... Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi- tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 1232.2006.12.1.3 24V 100mA Step-Up Converter 1 TDFN34-16 TSOPJW-12 TDFN34-16 = 25ºC) A TSOPJW-12 AAT1232 Value Units -0 -40 to 150 ° ...
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... I EN/SET Input Leakage EN/SET 1. The AAT1232 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. Switching input current will vary with R1, R2, R3 resistor values. 3. Some improvement in line and load regulation is possible with smaller resistor values. ...
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... V = 3.6V 0.5 IN 0.0 -0.5 -1.0 -1.5 0.1 10 100 1.5 1 3.6V IN 0.5 0.0 -0.5 -1.0 -1.5 0.1 10 100 1.5 1.0 0 3.6V IN 0.0 -0.5 -1.0 -1.5 0.1 10 100 AAT1232 Output Error vs. Output Current = 18V 20kΩ Ω OUT Output Current (mA) Output Error vs. Output Current = 20V 20kΩ Ω OUT Output Current (mA) Output Error vs. Output Current = 24V ...
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... Output Voltage Error vs. Temperature 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 - Load Input Current vs. Temperature 1.2 1.1 0.9 0.8 0.6 0.5 0.3 0.2 0.0 -40 4.5 5 5.5 = 100mA) 18.2 5.0 4.0 18.0 3.0 17.8 2.0 17.6 1.0 17.4 0.0 17.2 -1.0 17.0 AAT1232 ( 18V 100mA) IN OUT OUT - Temperature (° ° 3.6V 18V) IN OUT - Temperature (° ° C) Output Ripple (V = 4.2V 18V; No Load) IN OUT 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 Time (100µs/div) 1232.2006.12.1 ...
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... Step-Up Converter = 18V) (V OUT IN 12.10 1.5 1.2 12.05 0.9 12.00 11.95 0.6 11.90 0.3 0.0 11.85 11.80 -0.3 N-Channel R 160 140 120 100 5.5 6 2.5 = 12V) OUT 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0.0 -0.4 AAT1232 Load Transient Response = 3.6V 20mA–60mA 12V) OUT OUT 1.50 1.20 0.90 0.60 0.30 0.00 -0.30 Time (200µs/div) vs. Input Voltage DS(ON) 120°C 100°C 25°C 85°C 3 3.5 4 4.5 5 Input Voltage (V) 5 ...
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... V REF FB2 SEL Functional Description The AAT1232 consists of a DC/DC boost controller, an integrated slew rate controlled input disconnect MOSFET switch, and a MOSFET power switch. A high voltage rectifier, power inductor, output capac- itor, and resistor divider network are required to implement a DC/DC boost converter. Control Loop The AAT1232 provides the benefits of current mode control with a simple hysteretic feedback loop ...
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... Switching resumes when the current decays below the current limit. Thermal protection disables the AAT1232 when internal dissipation becomes excessive. Thermal protection disables both MOSFETs. The junction over-temperature threshold is 140°C with 15°C of temperature hysteresis ...
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... To ensure minimum forward voltage drop and no recovery, high voltage Schottky diodes are consid- ered the best choice for the AAT1232 boost convert- er. The AAT1232 output diode is sized to maintain Output ripple acceptable efficiency and reasonable operating junction temperature under full load operating condi- tions. Forward voltage (V resistance (θ ...
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... The recti- fier reverse current increases dramatically at high temperatures. Selecting the Boost Inductor The AAT1232 controller utilizes hysteretic control and the switching frequency varies with output load and input voltage. The value of the inductor deter- mines the maximum switching frequency of the AAT1232 boost converter ...
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... SEL logic pin high activates V pulling the SEL logic pin low activates V The minimum output voltage must be greater than the specified maximum input voltage plus margin to maintain proper operation of the AAT1232 boost converter. In addition, the ratio of output voltages always less than 2.0, correspon- ...
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... T . The output is sub- LAT sequently changed to the predetermined voltage. When EN/SET is set low for a time greater than T , the AAT1232 is disabled. When disabled, the OFF 1232.2006.12.1.3 24V 100mA Step-Up Converter R3 = 4.99kΩ Ω R1 (kΩ Ω (kΩ Ω ...
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... PCB effects (stray resistance, capacitance, inductance) and EMI cou- pling from the high frequency SW node. A suggested PCB layout for the AAT1232 boost converter is shown in Figures 4 and 5. The follow- ing PCB layout guidelines should be considered: Figure 4: AAT1232 Evaluation Board Top Side ...
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... I < PEAK SAT Value Type (µF) Ceramic 2.2 Ceramic 2.2 Ceramic 2.2 Ceramic 2.2 Ceramic 1.0 AAT1232 Thermal Resistance (θ θ , °C/ 625 SOD-323 30 625 SOD-323 20 426 SOD-323 30 325 SOD-123 30 206 SOD-123 40 330 SOD-523 30 330 SOT-23 DCR Size (mm) (Ω Ω ) LxWxH Type 35 5.0x5.0x2.4 ...
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... XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 16 24V 100mA Step-Up Converter Marking 1 SXXYY SXXYY TSOPJW-12 + 0.10 0.20 - 0.05 7° NOM 4° ± 4° 0.055 ± 0.045 0.010 AAT1232 Part Number (Tape and Reel) 2 AAT1232ITP-T1 AAT1232IRN-T1 0.04 REF 0.45 ± 0.15 2.75 ± 0.25 1232.2006.12.1.3 ...
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... Phone (408) 737-4600 Fax (408) 737-4611 1232.2006.12.1.3 24V 100mA Step-Up Converter TDFN34-16 Detail "B" Bottom View Pin 1 Indicator (optional) Option A: Option B: C0.30 (4x) max R0.30 (4x) max Chamfered corner Round corner Detail "A" AAT1232 0.35 ± 0.10 0.20 MIN 0.075 ± 0.075 Detail "B" 17 ...