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Advanced Analog Technology, Inc.
AAT1110
Details are subject to change without notice
ONE-CHANNEL STEP-DOWN PWM CONTROLLER
Features
Under-Voltage Lockout (UVLO) Protection Totem Pole Output Output Short Circuit Protection Incorporates Soft-Start Function Wide Operating FrequencyG 10 kHz to 1MHz Shutdown Control Low Dissipation Current : Typical 1.6mA in Operation SOP-8 & TSSOP-8 Package Available
General Description
The AAT1110 is a one-channel step-down PWM controller incorporating a soft-start function and a short circuit protection (SCP) function. Each device consists of an on-chip voltage reference, error amplifier, pulse width modulation controller, under-voltage protection, soft-start, and short circuit protection circuits. Switching frequencies up to 1MHz are set by an external resistor and capacitor. Soft-start time can be implemented by the SCP capacitor. Additionally, a chip enabled feature is provided to power down and reduce the supply current to 10 A .
Pin Configuration
With an optimized number of external components, the AAT1110 offers a simple and cost effective solution.
VDD
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Advanced Analog Technology, Inc.
AAT1110
Pin Description
Pin No 1 2 3 4 5 6 7 8 Name CE SCP VDD OUT GND OSC OE IE I/O I O O O I Description Chip Enable Input Pin] Internal Pull "H"^ Soft-Start and SCP Capacitor Connection Pin Power Supply Totem-Type Output Pin Ground Capacitor and Resistor Connection Pin for Setting the Oscillation Frequency Error Amplifier Output Pin Error Amplifier Inverting Input Pin
Absolute Maximum Ratings
Characteristics
Supply Voltage Output Current Operating Free-Air Temperature Range Storage Temperature Range Power Dissipation
Symbol VDD
Value 7
- 120 /+120 - 20 to +85 - 45 to +125
Unit V
IO TC
Tstorage
mA
o o
C C
Pd
500
mW
Recommended Operating Conditions
Characteristics Supply Voltage, VDD Symbol VDD VI C OSC Min 2.6 0.5 Max 6.5 1.6 Unit V V
Error Amplifier Input Voltage OSC Capacitor OSC Resistor Oscillator Frequency Output Current Operating Free-Air Temperature
100 1.0 10 - 20
10,000 10.0 1,000 +30/ - 30 +85
pF
k
R OSC f OSC IO TC
kHz mA
o
C
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Advanced Analog Technology, Inc.
AAT1110
Electrical Characteristics, VDD = 3.3V (Unless Otherwise Specified) (See Note 1)
Oscillator Parameter Test Condition C OSC = 270pF, R OSC = 4.2 k Min Typ Max Unit
Oscillation Frequency Frequency Variation With Temperature Frequency Input Stability
Under-Voltage Protection Parameter
f OSC f T f V
400
500 5
600
kHz % %
VDD = 2.6V to 6.5V
1
Upper Threshold Voltage Lower Threshold Voltage Hysteresis ( VUPH - VUPL )
VUPH VUPL VHYS
Test Condition TC = 25 oC
Min
Typ
Max Unit
2.12 2.47 1.96 2.28 0.19
2.85 2.63
V V V
TC = 25 C TC = 25 C TC =25 oC
o
o
Note1: Typical values of all parameters are specified at
Short Circuit Protection Control Parameter
Test Condition
Min
Typ
Max Unit
Input Threshold Voltage Short-Circuit Detect Threshold Voltage Charging Current
Soft-Start Parameter
Vr1 Vtscd I SCP VSCP =0V
1.160 1.262 1.360 1.160 1.262 1.360
- 2.15
V V
- 1.50 - 1.00 A
Charging Current Voltage at Soft-Start Completion
Shutdown Control Parameter
I CS Vts
Test Condition VSCP =0V
Min
- 2.15
Typ
Max Unit
- 1.50 - 1.00 A
1.160 1.262 1.360
V
Test Condition
Min
Typ
Max Unit
Shutdown Enable Voltage Shutdown Release Voltage
VSE VSR 2.0
0.5
V V
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Advanced Analog Technology, Inc.
AAT1110
Electrical Characteristics, VDD = 3.3V (Unless Otherwise Specified) (See Note 1)
EA (Error Amplifier) Parameter
Input Threshold Voltage
VT
VTV VTT
Test Condition VOE = 0.7V
Min
Typ
Max Unit
1.249 1.262 1.275 1.4 2 1 0.1 1.7 0.05 20
- 75
V mV %
A
VT Input Stability VT Variation with
Temperature Input Bias Current Output Voltage Swing Output Sink Current Output Source Current Open-Loop Voltage Gain
Output Section Parameter
VDD = 2.6 to 6.5V TC = - 20 oC to 90 oC
8 1.0 0.20 -
IB
VOS+ VOS- I OS+ I OS- A VO VOE =0.7V VOE =0.7V
V mA
A
3
- 45
70
85
dB
High-Level Output Voltage Low-Level Output Voltage Rise Time Fall Time
Operating Current Parameter
VOH VOL t RISE t FALL
Test Condition IO= - 30 mA
Min
Typ
Max Unit
1.9 -
2.3 0.8 100 100
1.2 -
V V ns ns
IO=+30mA CL=1,000pF CL=1,000pF
Supply Current
I DD-OFF I DD-ON
Test Condition Output "OFF" State
Min
Typ
Max Unit
-
1.3 1.6
-
mA mA
RT =4.2 k
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Advanced Analog Technology, Inc.
AAT1110
How to Set the Time Constant for Soft-Start and Short Circuit Protection
1. Soft-Start At power on, the AAT1110 operates in soft-start mode. The capacitor C SCP connected to SCP pin starts charging at a constant current. In the soft-start mode, the voltage at SCP pin ( VSCP ) is input to the PWM comparator, so that the ON duty of the OUT pin is controlled by the VSCP . At completion of the soft-start operation, the voltage at the SCP pin stays low; the input from soft-start circuit to the PWM comparator stays high, and enters the short circuit protection waiting state. Soft-Start Time t s (sec) ~ 0.84 x C SCP (F) 2. Short Circuit Protection If the switching regulator output suddenly drops due to loading effect, the error amplifier output will be fixed at VOM + and capacitor C SCP will start charging. When the voltage at the SCP pin reaches approximately 1.26V, the output pin will set low and SCP pin will remain low. Once the protection circuit starts operating, the circuit can be recovered by setting the power supply. Short Circuit Detection Time
t scp (sec) ~ 0.84 x C SCP (F)
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Advanced Analog Technology, Inc.
AAT1110
Block Diagram
V DD
CE
C h ip E n a b le
IREF
GND
V REF 1 .2 6 V SCP C om p.
LA TCH
SCP
S o ft-S tart SCP
UVC UVC
CE OSC OSC
CE UVLO
V DD CE
V REF 1 .2 6 v
PW M Com p.
V REF CE
V DD
OE
V REF 1 .2 6 V E rr-A m p
OUT
UVC
IE CE
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Advanced Analog Technology, Inc.
AAT1110
Application Circuit Buck (Step-Down)
VDD
Cscp
VDD
VDD
VDD
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Advanced Analog Technology, Inc.
AAT1110
Buck (Step-Down) Timing Chart
OE Reference Input for Short Circuit ldle Period Setting Voltage Soft-Start Setting Voltage OSC
1.262V
Output
SCP Soft-Start
Output Short Circuit
Output Short Circuit
ts
2.47V Lockout Free
VDD
tscp
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Advanced Analog Technology, Inc.
AAT1110
Package Dimension
8-Pin SOP
SYMBOLS A A1 A2 b C D E E1 e L y
DIMENSIONS IN MILLIMETERS MIN 1.47 0.10 --0.33 0.19 4.80 5.80 3.80 --0.38 --0 TYP 1.60 --1.45 0.41 0.20 4.85 6.00 3.90 1.27 0.71 ----MAX 1.73 0.22 --0.51 0.25 4.95 6.20 4.00 --1.27 0.076 0
DEMINSIONS IN INCHES MIN 0.058 0.004 --0.013 0.0075 0.189 0.228 0.150 --0.015 --0 TYP 0.063 --0.057 0.016 0.008 0.191 0.236 0.154 0.050 0.028 ----MAX 0.068 0.008 --0.020 0.0098 0.195 0.244 0.157 --0.050 0 0
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Advanced Analog Technology, Inc.
AAT1110
Tape and Reel
8-PinSOP
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Advanced Analog Technology, Inc.
AAT1110
Tape and Reel
8-Pin SOP (Cont.)
NOTE: 1. 10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE 0.2 MILLIMETERS. 2. CAMBER NOT TO EXCEED 1 MILLIMETER IN 100 MILLIMETERS 3. MATERIAL: ANTI-STATIC BLACK ADVANTEK POLYSTYRENE. 4. A 0 AND B 0 ARE MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET. 5. 6.
K 0 IS MEASURED FROM A PLANE ON THE INSIDE BOTTOM OF THE POCKET TO THE TOP SURFACE OF
THE CARRIER. POCKET POSITION RELATIVE TO SPROCKET HOLE IS MEASURED AS TRUE POSITION OF POCKET, NOT POCKET HOLE.
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Advanced Analog Technology, Inc.
AAT1110
Package Dimension
TSSOP-8
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Advanced Analog Technology, Inc.
AAT1110
Package Dimension
TSSOP-8
SYMBOL
A A1 A2 b C D E E1 e L y
DIMENSION IN MILLIMETERS MIN TYP MAX 1.05 1.10 1.20 0.05 0.10 0.15 ----1.00 1.05 0.25 ----0.30 ----0.127 ----2.90 3.05 3.10 6.20 6.40 6.60 4.30 4.40 4.50 ----0.65 ----0.50 0.60 0.70 --------0.076 o o 0 8o 4
DIMENSION IN INCHES MIN TYP MAX 0.041 0.043 0.047 0.002 0.004 0.006 ----0.039 0.041 0.010 ----0.012 ----0.005 ----0.114 0.120 0.122 0.244 0.252 0.260 0.169 0.173 0.177 ----0.026 ----0.020 0.024 0.028 --------0.003 o o 0 8o 4
NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS. 2. LEAD FRAME MATERIAL: OLIN C7025/EFTEC 64T. 3. DIMENSION "D" DOES NOT INCLUDE MOLD FLASH, TIE BAR BURRS AND GATE BURRS. MOLD FLASH, TIE BAR BU 0.006" [0.15 MILLIMETERS] PER END. DIMENSION "E1" DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLA MILLIMETERS] PER SIDE. 4. DIMENSION "b" DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.00 "b" DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS O PROTRUSION AND AN ADJACENT LEAD TO BE 0.0028" [0.07 MILLIMETERS]. 5. TOLERANCE: 0.010" [0.25 MILLIMETERES] UNLESS OTHERWISE SPECIFIED. 6. OTHERWISE DIMENSION FOLLOW ACCEPTABLE SPEC. 7. REFERENCE DOCUMENT: JEDEC SPEC MO-153.
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Advanced Analog Technology, Inc.
AAT1110
Tape and Reel
TSSOP-8
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Advanced Analog Technology, Inc.
AAT1110
Tape and Reel
TSSOP-8 (Cont.)
X.XXX X 0.0025 0.006 X.XXX 0.025 X.XX 0.10 X.X 0.25 X UNIT: MILLIMETERS
NOTE: 1. 10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE 0.2 MILLIMETERS. 2. CHAMBER NOT TO EXCEED 1 MILLIMETER IN 100 MILLIMETERS. 3. MATERIAL: ANTI-STATIC BLACK ADVANTEK POLYSTYRENE. 4. A 0 AND B 0 ARE MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET. 5. K 0 IS MEASURED FROM A PLANE ON THE INSIDE BOTTOM OF THE POCKET TO THE TOP SURFACE OF THE CARRIER. 6. POCKET POSITION RELATIVE TO SPROCKET HOLE IS MEASURED AS TRUE POSITION OF POCKET, NOT POCKET HOLE.
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Advanced Analog Technology, Inc.
AAT1110
Part Marking
SOP8 Top Marking
AAT1110 XXXXXX
SOP8 Back Marking
YYWW
Part Marking
TSSOP8 Top Marking
AAT1110 XXXXXX
TSSOP8 Back Marking
YYWW
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Advanced Analog Technology, Inc.
AAT1110
Ordering Information
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