AAT1123IJS-1.2-T1 Advanced Analog Technology, Inc., AAT1123IJS-1.2-T1 Datasheet

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AAT1123IJS-1.2-T1

Manufacturer Part Number
AAT1123IJS-1.2-T1
Description
1MHz Step-Down Converter
Manufacturer
Advanced Analog Technology, Inc.
Datasheet
General Description
The AAT1123 SwitchReg™ is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. It is a 1MHz step-down
converter with an input voltage range of 2.7V to
5.5V and output as low as 0.6V. Its low supply cur-
rent, small size, and high switching frequency
make the AAT1123 the ideal choice for portable
applications.
The AAT1123 is available in either a fixed version
with internal feedback or a programmable version
with external feedback resistors. It can deliver up
to 600mA of load current while maintaining a low
25µA no load quiescent current. The 1MHz switch-
ing frequency minimizes the size of external com-
ponents while keeping switching losses low. The
AAT1123 feedback and control delivers excellent
load regulation and transient response with a small
output inductor and capacitor.
The AAT1123 is designed to maintain high efficien-
cy throughout the operating range and provides
fast turn-on time.
The AAT1123 is available in a space-saving
2.0x2.1mm SC70JW-8 package and is rated over
the -40°C to +85°C temperature range.
Typical Application (Fixed Output Voltage)
1123.2007.02.1.6
4.7μF
C2
V
IN
3
1
5
8
VIN
EN
AGND
PGND
U1
AAT1123
PGND
PGND
OUT
LX
4
2
7
6
4.7μH
L1
V
O
C1
22μF
Features
Applications
100
90
80
70
60
0.1
V
V
— Fixed or Adjustable Version
Fast Turn-On Time (100µs Typical)
25µA No Load Quiescent Current
Up to 97% Efficiency
Output Current Up to 600mA
1MHz Switching Frequency
Soft Start
Over-Temperature Protection
Current Limit Protection
100% Duty Cycle Low-Dropout Operation
0.1µA Shutdown Current
SC70JW-8 Package
Temperature Range: -40°C to +85°C
Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor / DSP Core / IO Power
PDAs and Handheld Computers
USB Devices
IN
OUT
Range: 2.7V to 5.5V
1MHz Step-Down Converter
Adjustable Down to 0.6V
V
IN
1
AAT1123 Efficiency
(V
= 3.3V
OUT
Output Current (mA)
= 2.5V; L = 10μ μ H)
10
SwitchReg
AAT1123
100
1000
1

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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 ...

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