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Advanced Analog Technology, Inc.
AAT1109
Details are subject to change without notice.
ONE-CHANNEL STEP-UP PWM CONTROLLER
FEATURES
Under-Voltage Lockout (UVLO) Protection Totem Pole Output Output Short Circuit Protection 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 AAT1109 is a one-channel step-up PWM controller incorporating a soft-start and a short circuit protection (SCP) function. This device consists of an on-chip voltage reference, error amplifier, pulse width modulation controller, under-voltage lockout protection, soft-start, and short circuit protection circuits. Switching frequency up to 1MHz is set by an external resistor and capacitor. Soft-start time can be implemented by the SCP capacitor. Additionally, a chip-enable feature is also provided to power down and reduce the current supply to 10A . With the minimal external components, the AAT1109 offers a simple and economical solution.
PIN CONFIGURATION
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AAT1109
PIN DESCRIPTION
PIN NO. 1 2 3 4 5 6 7 8 NAME I/O DESCRIPTION CE I Chip Enable Input Pin] Internal Pull "H"^ SCP I Soft-Start and SCP Capacitor Connection Pin VDD - Power Supply OUT O Totem Pole Type Output Pin GND - Ground OSC O Capacitor and Resistor Connection Pin for Setting the Oscillation Frequency OE O Output Pin of Error Amplifier I Inverting Input Pin of Error Amplifier IE
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
mA
o o
IO
TC
Tstorage
C
Pd
500
C mW
RECOMMENDED OPERATING CONDITIONS
Supply Voltage Error Amplifier Input Voltage Oscillator (OSC) Capacitance Oscillator (OSC) Resistance Oscillator (OSC) Frequency Output Current Operating Free-Air Temperature
SYMBOL VDD VI C OSC MIN 2.6 0.5 MAX 6.5 1.6 UNIT V V pF
k
100 1.0 10
- 20
10,000 10.0 1,000
+ 30 / - 30 + 85
R OSC f OSC IO TC
kHz
mA
o
C
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AAT1109
ELECTRICAL CHARACTERISTICS, VDD = 3.3V (UNLESS OTHERWISE SPECIFIED) (SEE NOTE 1) OSCILLATOR
PARAMETER SYMBOL
Oscillation Frequency Frequency Variation with Temperature Frequency Input Stability
f OSC f T f V
TEST CONDITION C OSC =270pF R OSC = 4.2k
MIN TYP MAX UNIT
400
500 5 1
600
kHz
% %
TC = -20 o C to
+ 85 C VDD = 2.6V to 6.5V
o
UNDER-VOLTAGE PROTECTION
PARAMETER TEST CONDITION
Upper Threshold Voltage Lower Threshold Voltage Hysteresis (VUPH - VUPL )
VUPH VUPL VHYS
TC = 25 C TC = 25o C TC = 25o C = 25o C .
o
MIN TYP MAX UNIT V 2.12 2.47 2.85
1.96 2.28 0.19
2.63
V V
Note 1: Typical values of all parameters are specified at TC
SHORT CIRCUIT PROTECTION CONTROL
PARAMETER TEST CONDITION MIN TYP MAX UNIT
Input Threshold Voltage Short-Circuit Detection Threshold Voltage Charging Current
Vr1 Vr 2 I SCP VSCP = 0V
1.160 1.262 1.360 1.160 1.262 1.360
- 2.15 - 1.50 - 1.00
V V
A
SOFT-START
PARAMETER
Charging Current Voltage at Soft-Start Completion
I CS Vts
TEST CONDITION VSCP = 0V
MIN TYP MAX UNIT
- 2.15 - 1.50 - 1.00 A
1.160 1.262 1.360
V
SHUTDOWN CONTROL
PARAMETER TEST CONDITION MIN TYP MAX UNIT
Shutdown Enable Voltage Shutdown Release Voltage
VSE VSR 2.0
0.5
V V
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AAT1109
ELECTRICAL CHARACTERISTICS, VDD = 3.3V (UNLESS OTHERWISE SPECIFIED (SEE NOTE 1) IDLE PERIOD ADJUSTMENT SECTION
PARAMETER
Maximum Duty Cycle
t Duty
TEST CONTION MIN TYP MAX UNIT , C OSC = 270pF 75 85 93 % R OSC = 4.2k , VOE = 1.12V
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 2
1 0.1 1.4 1.7 0.05 0.20 20
- 75
V
mV
VT Input Stability VT Variation with
Temperature Input Bias Current
Output Voltage Swing Output Sink Current Output Source Current Open-Loop Voltage Gain
VDD = 2.6 to 6.5V
TC = -20 o C to + 85o C
8
% 1.0
A
IB VOS+
VOS- I OS+ I OS- A VO VOE = 0.7V VOE = 0.7V
V
mA A
3
- 45
70
85
dB
OUTPUT SECTION
PARAMETER TEST CONDITION TYP MAX UNIT
High-Level Output Voltage Low-Level Output Voltage Rise Time Fall Time
VOH VOL t RISE
I o = -30mA I o = +30mA C L = 1,000pF
1.9
2.3 0.8 100 1.2
V V
ns ns
t FALL
C L = 1,000pF
100
OPERATING CURRENT
PARAMETER TEST CONDITION MIN TYP MAX UNIT
Supply Current
I DD-OFF I DD-ON
Output "OFF" State R OSC = 4.2k
1.3 1.6
mA mA
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AAT1109
HOW TO SET THE TIME CONSTANT FOR SOFT-START AND SHORT CIRCUIT PROTECTION
1. Soft-Start AAT1109 operates in soft-start mode. The PWM comparator monitors the voltage at soft-start setting
and SCP pin, which varies proportionally to each other. This proportion relation controls the ON duty of the OUT pin and activates the soft-start operation. 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 determined by the VSCP . When the soft-started mode is completed, its setting voltage remains high and the circuit enters the output short circuit protection wait state while VSCP remains low. Soft-Start Time t s (sec ) ~ 0.84 x CSCP (F)
2. Short Circuit Protection In response to a sudden drop of the switching regulator output, the device locks the error amplifier, OE pin, at VOS+ , and starts feeding currents into the capacitor at SCP pin to achieve in a voltage value of
approximately 0.84V at this pin. This chain reaction protects the circuit by keeping the SCP pin and output pin low. Users could reverse this process by restarting the device. Short Circuit Detection Time t SCP (sec ) ~ 0.84 x CSCP (F )
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AAT1109
BLOCK DIAGRAM
V DD
CE
C h ip E n a b le
IREF
GND
VREF 1 .2 6 V
LA TCH SCP C om p.
SCP
S o ft-S ta rt SCP
UVC UVC
CE OSC OSC
CE UVLO
VREF V DD CE
V REF
1 .2 6 V
PW M Com p.
OE
CE
V DD DTC 0 .7 6 5 V E rr-A m p
V REF 1 .2 6 V
OUT
UVC
IE CE
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AAT1109
APPLICATION CIRCUIT 1 BOOST (STEP-UP)
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AAT1109
APPLICATION CIRCUIT 2 (WITH CHARGE PUMP)
V OUT
VP 3 * Vout
V N - V out
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AAT1109
BOOST ] STEP-UP^ TIMING CHART
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AAT1109
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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AAT1109
TAPE AND REEL
8-PIN SOP
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AAT1109
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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AAT1109
PACKAGE DIMENSION
TSSOP-8
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AAT1109
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 BURRS AND GATE BURRS SHALL NOT EXCEED 0.006" [0.15 MILLIMETERS] PER END. DIMENSION "E1" DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" [0.25 MILLIMETERS] PER SIDE. 4. DIMENSION "b" DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.003" [0.08 MILLIMETERS] TOTAL IN EXCESS OF THE "b" DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS OR THE FOOT. MINIMUM SPACE BETWEEN 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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AAT1109
TAPE AND REEL
TSSOP-8
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AAT1109
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. 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. 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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AAT1109
PART MARKING
SOP8 TOP MARKING
AAT1109 XXXXXX
SOP8 BACK MARKING
YYWW
PART MARKING
TSSOP8 TOP MARKING
AAT1109 XXXXXX
TSSOP8 BACK MARKING
YYWW
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AAT1109
ORDERING INFORMATION
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