AAT1123IJS-1.2-T1 Advanced Analog Technology, Inc., AAT1123IJS-1.2-T1 Datasheet
AAT1123IJS-1.2-T1
Related parts for AAT1123IJS-1.2-T1
AAT1123IJS-1.2-T1 Summary of contents
Page 1
General Description The AAT1123 SwitchReg™ member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family 1MHz step-down converter with an input voltage range of 2.7V to 5.5V and output as low as 0.6V. Its low ...
Page 2
Pin Descriptions Pin # Symbol Function 1 EN Enable pin. 2 OUT Feedback input pin. This pin is connected either directly to the converter output external resistive divider for an adjustable output. 3 VIN Input supply voltage ...
Page 3
Absolute Maximum Ratings Symbol Description V Input Voltage GND GND OUT to GND OUT GND EN T Operating Junction Temperature Range J T Maximum Soldering Temperature (at leads, 10 sec) ...
Page 4
Electrical Characteristics T = -40°C to +85°C, unless otherwise noted. Typical values are T A Symbol Description Step-Down Converter V Input Voltage IN V UVLO Threshold UVLO V Output Voltage Tolerance OUT V Output Voltage Range OUT I Quiescent Current ...
Page 5
Typical Characteristics Efficiency vs. Load = 3.3V 10μ μ OUT 100 4. 0 Output Current (mA) Efficiency vs. Load = 2.5V 10μ μ ...
Page 6
Typical Characteristics Frequency vs. Input Voltage (V = 1.8V) OUT 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 2.7 3.1 3.5 3.9 4.3 Input Voltage (V) Switching Frequency vs. Temperature (V = 3.6V 1.5V 0.20 0.10 0.00 ...
Page 7
Typical Characteristics Load Transient Response = 1.5V 22μ μ F) (30mA - 300mA 3.6V OUT 1.65 1.60 1.55 1.50 1.45 300mA 1.40 30mA 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 Time (25μs/div) Line ...
Page 8
Functional Block Diagram Voltage Reference INPUT EN Note: For adjustable version, the internal feedback divider is omitted and the FB pin is tied directly to the internal error amplifier. Functional Description The AAT1123 is a high performance 600mA 1MHz monolithic ...
Page 9
V OUT 22μF GND GND2 Figure 1: Enhanced Transient Response Schematic. Control Loop The AAT1123 is a peak current mode step-down converter. The current through the P-channel MOSFET (high side) is sensed for current loop control, as well as short ...
Page 10
Applications Information Inductor Selection The step-down converter uses peak current mode control with slope compensation to maintain stability for duty cycles greater than 50%. The output induc- tor value must be selected so the inductor current down slope meets the ...
Page 11
The maximum input capacitor RMS current is: ⎛ · O · ⎝ RMS The input capacitor RMS ripple current varies with the input and output voltage and ...
Page 12
A laboratory test set-up typically consists of two long wires running from the bench power supply to the evaluation board input voltage pins. The induc- tance of these wires, along with the low-ESR ceramic input capacitor, can create a high ...
Page 13
R2 = 59kΩ Ω R1 (kΩ Ω (V) OUT 0.8 19.6 0.9 29.4 1.0 39.2 1.1 49.9 1.2 59.0 1.3 68.1 1.4 78.7 1.5 88.7 1.8 118 1.85 124 2.0 137 2.5 187 3.3 267 Table 2: Adjustable ...
Page 14
Since R , quiescent current, and switching DS(ON) losses all vary with input voltage, the total losses should be investigated over the complete input voltage range. Given the total losses, the maximum junction tem- perature can be derived from the ...
Page 15
Step-Down Converter Design Example Specifications V = 1.8V @ 400mA (adjustable using 0.6V version), Pulsed Load Δ 2.7V to 4.2V (3.6V nominal 1.0MHz 85°C AMB 1.8V Output Inductor μsec μsec ⋅ ...
Page 16
Input Capacitor Input Ripple V = 25mV ⎛ ⎞ ⎛ V 25mV PP - ESR · 4 · F ⎝ ⎠ ⎝ 0. 0.2Arms RMS 2 ...
Page 17
V (V) OUT Adjustable Version (0.6V device) 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.8 1.85 2.0 2.5 3.3 V (V) OUT Fixed Version 0.6-3.3V Table 3: Evaluation Board Component Values. Manufacturer Part Number Sumida CDRH3D16-4R7 Sumida CDRH3D16/HP-100 MuRata ...
Page 18
Manufacturer Part Number MuRata GRM21BR60J226ME39 TDK C2012X5R0J226K Taiyo-Yuden JMK212BJ226KL 18 1MHz Step-Down Converter Value 22µF 22µF 22µF Table 5: Surface Mount Capacitors. AAT1123 Voltage Temp. Co. Case 6.3V X5R 0805 6.3V X5R 0805 6.3V X5R 0805 1123.2007.02.1.6 ...
Page 19
... Contact Sales for other voltage options. 2. XYY = assembly and date code. 3. Sample stock is generally held on part numbers listed in BOLD. 1123.2007.02.1.6 1MHz Step-Down Converter Marking 2 PMXYY VTXYY SC70JW-8 0.225 ± 0.075 0.100 0.45 ± 0.10 2.10 ± 0.30 AAT1123 Part Number (Tape and Reel) 3 AAT1123IJS-0.6-T1 AAT1123IJS-1.2-T1 0.048REF 4° ± 4° 19 ...
Page 20
Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves ...