AAT1150IKS-1.5-T1 ANALOGICTECH [Advanced Analogic Technologies], AAT1150IKS-1.5-T1 Datasheet

Page 1

General Description The AAT1150 SwitchReg™ member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family. The step-down switch- ing converter is ideal for applications where high efficiency, small size, and low ripple are critical. Able to deliver 1A ...

Page 2

Pin Descriptions Pin # Symbol Function 1 FB Feedback input pin. This pin must be connected to the converter’s output used to set the output of the converter to regulate to the desired value. 2 SGND Signal ground. ...

Page 3

Absolute Maximum Ratings T = 25°C, unless otherwise noted. A Symbol Description GND GND GND GND EN T ...

Page 4

Electrical Characteristics 5V -40°C to +85°C, unless otherwise noted. Typical values are Symbol Description V Input Voltage Range IN V Output Voltage Tolerance OUT ∆V (V ...

Page 5

Typical Characteristics High Side R vs. Temperature DS(ON) 170 3.6V 150 2.7V 130 110 5. Temperature (°C) R vs. Input Voltage DS(ON) 130 120 High Side 110 100 Low Side 90 80 ...

Page 6

Typical Characteristics Output Voltage vs. Temperature (I = 900mA 1.5V) OUT OUT 1.0 0.6 0.2 -0 3.6V IN -0.6 -1.0 - Temperature (°C) Load Regulation (V = 1.5V 3.6V) OUT IN ...

Page 7

Typical Characteristics No Load Input Current vs. Temperature ( Temperature (°C) ...

Page 8

Typical Characteristics Output Ripple (V = 5.0V OUT V OUT 5mV/div BW = 20MHz LX 2V/div 500nsec/div Inrush Limit (V = 3.6V OUT Enable 2V/div V OUT 1V/div I L 0.5A/div 200µsec/div 8 1MHz 1A Step-Down ...

Page 9

Functional Block Diagram 1.0V REF FB Applications Information Control Loop The AAT1150 is a peak current mode buck con- verter. The inner wide bandwidth loop controls the peak current of the output inductor. The output inductor current is sensed through ...

Page 10

Power and Signal Source Separate small signal ground and power supply pins isolate the internal control circuitry from the noise associated with the output MOSFET switch- ing. The low pass filter R1 and C3 in schematic Figures 1 and 2 ...

Page 11

Inductor The output inductor is selected to limit the ripple current to some predetermined value, typically 20% to 40% of the full load current at the maximum input voltage. Manufacturer's specifications list both the inductor DC current rating, which is ...

Page 12

The equation for the RMS current in the input capacitor is: ⎛ V ⋅ ⋅ ⎝ RMS The input capacitor RMS ...

Page 13

Figure 4: AAT1150 Layout Top Layer 3. 10µF Figure 6: 3.3V to 1.25V Converter (Adjustable Output). 1150.2005.03.1.2 1MHz 1A Step-Down DC/DC Converter Figure 5: AAT1150 Layout Bottom Layer. R3 AAT1150-1.0 2.55k 100 ...

Page 14

Design Example Specifications I = 1.0A OUT I = 30% of Full Load at Max V RIPPLE V = 1.5V OUT V = 2.7V to 4.2V (3.6V nominal 830kHz s Maximum Input Capacitor Ripple ⎛ ⎞ V ...

Page 15

AAT1150 Dissipation ⋅ ⋅ ⋅ DSON(H) O DSON( ⋅ ⋅ (0.14Ω 1.5V + 0.145Ω (3.6V - 1.5V)) = 3.6V + Θ ⋅ 85°C ...

Page 16

... MSOP-8 HYXYY MSOP-8 KAXYY MSOP-8 KCXYY MSOP-8 HZXYY MSOP-8 1.95 BSC PIN 1 3.00 ± 0.10 10° ± 5° 0.075 ± 0.075 0.30 ± 0.08 0.65 BSC AAT1150 Part Number (Tape and Reel) AAT1150IKS-1.0-T1 AAT1150IKS-1.5-T1 AAT1150IKS-1.8-T1 AAT1150IKS-2.5-T1 AAT1150IKS-3.3-T1 4° ± 4° 0.60 ± 0.20 0.254 BSC 0.155 ± 0.075 1150.2005.03.1.2 ...