AAT3183IJS-1.5-T1 Advanced Analog Technology, Inc., AAT3183IJS-1.5-T1 Datasheet

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AAT3183IJS-1.5-T1

Manufacturer Part Number
AAT3183IJS-1.5-T1
Description
300mA Inductorless Step-Down Converter
Manufacturer
Advanced Analog Technology, Inc.
Datasheet
General Description
The AAT3183 is a high efficiency step-down charge pump
converter providing up to 300mA of output current. The
1/2x (gain) charge pump converter topology provides
enhanced efficiency over conventional LDO regulators
and requires only three low cost ceramic capacitors. No
inductor is required; saving space and cost when com-
pared to inductive switching regulators.
The AAT3183 typically consumes 35µA of no load (zero
output current) quiescent current, making it ideal for
portable battery powered systems. Shutdown current is
less than 1µA.
The AAT3183 soft-start prevents excessive inrush cur-
rent while providing monotonic turn-on characteristics.
The device includes integrated short-circuit and over-
temperature (thermal) protection to safeguard system
components.
The AAT3183 is available in a Pb-free 2.0x2.1mm
SC70JW-8 package. Operating temperature range is
-40°C to +85°C.
Typical Application
3183.2008.02.1.3
ChargePump
TM
V
ENABLE
V
IN
C
1µF
w w w . a n a l o g i c t e c h . c o m
IN
IN
EN
C1-
AAT3183
C
1µF
FLY
C1+
GND
OUT
300mA Inductorless Step-Down Converter
Features
• V
• V
• 300mA Maximum Output Current
• Ultra-Small Solution for Portable Applications
• High Efficiency over the Output Current Range
• Excellent Transient Performance
• 35µA Typical Quiescent Current
• <1.0µA Shutdown Current
• Up to 2MHz Switching Frequency
• Integrated Soft-Start
• Short-Circuit and Thermal Protection
• 2.0x2.1mm SC70JW-8 Package
• -40°C to 85°C Temperature Range
Applications
• Camcorders
• Digital Still Cameras
• DSP Core Supplies
• PDAs, Handheld Devices, Notebook PCs
• Smart Phones
IN
OUT
Small Footprint
Only Three External Ceramic Capacitors Required
No Inductor
Range: 2.7V to 5.5V
: 1.5V and 1.34V
C
4.7µF
OUT
V
PRODUCT DATASHEET
OUT
AAT3183
1

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AAT3183IJS-1.5-T1 Summary of contents

Page 1

ChargePump TM General Description The AAT3183 is a high efficiency step-down charge pump converter providing up to 300mA of output current. The 1/2x (gain) charge pump converter topology provides enhanced efficiency over conventional LDO regulators and requires only three low ...

Page 2

ChargePump ChargePump TM TM Pin Descriptions Pin # Symbol Function 1 OUT Charge pump converter output. Requires a ceramic capacitor to ground. 2 C1+ Flying capacitor positive terminal. Connect fl ying capacitor between C1+ and C1-. 3 C1- Flying capacitor ...

Page 3

ChargePump ChargePump TM TM Absolute Maximum Ratings Symbol Description V Input Voltage to Ground IN V Enable Voltage to Ground EN T Operating Junction Temperature Range J T Storage Temperature Range S T Maximum Soldering Temperature (at leads, 10 sec) ...

Page 4

ChargePump ChargePump TM TM Electrical Characteristics V = 3.6V 1.0µ FLY OUT 25°C. Symbol Description V Input Voltage IN V Output Voltage Accuracy OUT V Under-Voltage Lockout (UVLO) UVLO I Output Current OUT ...

Page 5

ChargePump ChargePump TM TM Typical Characteristics Efficiency vs. Output Current (V = 1.5V) OUT ...

Page 6

ChargePump ChargePump TM TM Typical Characteristics Output Voltage Error vs. Temperature (V = 3.6V 1.5V 150mA) IN OUT OUT 8.0 6.0 4.0 2.0 0.0 -2.0 -4.0 -6.0 -8.0 -40 -25 - Temperature ...

Page 7

ChargePump ChargePump TM TM Typical Characteristics Line Transient (V = 3.6V to 4.2V) IN 1.51 1.505 1.5 1.495 1.49 1.485 1.48 1.475 1.47 Time (500µs/div) Output Ripple (V = 3.6V 1.5V 150mA) IN OUT OUT 1.54 ...

Page 8

ChargePump ChargePump TM TM Functional Block Diagram EN Functional Description The AAT3183 is a 1/2x (gain) charge pump converter providing an output voltage which is less than the input voltage. The step-down (buck) charge pump converter provides a regulated output ...

Page 9

ChargePump TM Integrated soft-start limits inrush current, maintains monotonic turn-on characteristics and eliminates output voltage overshoot. The device includes short-circuit pro- tection and a self-recovering over-temperature (thermal) protection. Charge Pump Operation The AAT3183 step-down charge pump is implemented using a ...

Page 10

ChargePump TM Therefore, the AAT3183 provides a 100% efficiency improvement over conventional LDO regulators, as illus- trated in Figure AAT3183 LDO 100 150 Output Current (mA) Figure 2: ...

Page 11

ChargePump TM Applications Information Input Voltage Headroom The input voltage headroom is the required minimum input voltage in excess of 2x the output voltage. The following equation can be used to calculate the required input voltage headroom: (I · R ...

Page 12

ChargePump TM Input Output Capacitor C Capacitor IN Size (µF/V) Size 0402 2.2/6.3 0603 0603 4.7/6.3 0603 Table 1: AAT3183 Capacitor Size Selection Chart (see Table 2 for corresponding manufacturer part numbers). Input and Output Capacitors C /C Voltage IN ...

Page 13

ChargePump TM L TRACE V IN Figure 3: AC Parasitic Components of an AAT3183 Typical Application Circuit. Thermal Performance Power de-rating of the AAT3183 is not necessary in most cases due to the low thermal resistance of the SC70JW-8 package, ...

Page 14

ChargePump ChargePump TM TM Figure 4: AAT3183 Evaluation Board Top Layer Figure 6: AAT3183 Evaluation Board Schematic 300mA Inductorless Step-Down Converter 300mA Inductorless Step-Down Converter Figure 5: AAT3183 Evaluation Board FLY 3 ...

Page 15

... PRODUCT DATASHEET PRODUCT DATASHEET AAT3183 AAT3183 Part Number (Tape and Reel) AAT3183IJS-1.5-T1 AAT3183IJS-1.34-T1 0.048REF 4° ± 4° 2.10 ± 0. ...

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