Preliminary Provisional ONE-CHANNEL BOOST SWITCHING REGULATOR

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Preliminary Provisional ONE-CHANNEL BOOST SWITCHING REGULATOR

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AAT1109
Preliminary Provisional
ONE-CHANNEL BOOST SWITCHING REGULATOR
Features
Under-voltage lockout protection Totem pole output Output short circuit protection Incorporates soft start function Wide operating frequency 10kHz 1MHz Shut down control dissipation current Typical 1.6mA operation Sop-8 Tssop-8 package available
General Description
AAT1109 one-channel switching regulator control incorporating soft start function short circuit protection function. Each device consists on-chip voltage reference, error amplifier, pulse width modulation controller, under-voltage protection, soft start short circuit protection circuits. Switching frequencies 1MHz external resistor capacitor. Soft-start time implemented capacitor. Additionally, chip enable feature provided power down reducing supply current 10uA. With minimum number external components, AAT1109 offers simple cost effective solution.
Configuration
VIEW
(SOP-8 PACKAGE) (TSSOP-8 PACKAGE)
Advanced Analog Technology, Inc.
January 2004
AAT1109
Description
Name Description Chip enable input pininternal pull Soft start capacitor connection Power supply Totem-type output Ground Capacitor resistor connection setting oscillation frequency Error amplifier output Error amplifier inverting input
Absolute Maximum Ratings
CHARACTERISTICS Supply voltage SYMBOL VALUE UNIT
Output current Operating free-air temperature range Storage temperature range Power dissipation
Tope Tstg
-120/+120
Recommended Operating Conditions
Supply voltage, Error amplifier input voltage capacitor resistor Oscillator frequency Output current Operating free-air temperature
Symbol 10000 1000 Unit
Tope
+30/-30
Advanced Analog Technology, Inc.
January 2004
AAT1109
Electrical Characteristics, 3.3V (Unless Otherwise Specified) (See Note Oscillator
Parameter Test Condition
Oscillation frequency Frequency variation with temperature Frequency input stability
270pF, 4.2k
Unit
2.6V 6.5V
Under-voltage Protection
Parameter Test Condition Unit
Upper threshold voltage Lower threshold voltage Hysteresis VUPH VUPL
VUPH VUPL VHYS
2.12 2.47 1.96 2.28
2.85 2.63
Note1 Typical values parameters specified
Short Circuit Protection Control
Parameter Test Condition Unit
Input threshold voltage Short-circuit detect threshold voltage Charging current
1.16 1.262 1.16 1.262 Vscp=0v -1.0 -1.5
1.36 1.36 -2.15
Soft start
Parameter Test Condition Unit
Charging current Voltage soft start completion
Vscp=0v
-1.0 -1.5 -2.15 1.16 1.262 1.36
Shun Down Control
Parameter Test Condition Unit
Shut down enable voltage Shut down release voltage
Vsdl Vsdh
Advanced Analog Technology, Inc.
January 2004
AAT1109
Electrical Characteristics, 3.3V (Unless Otherwise Specified) (See Note Idle period adjustment section
Parameter Test Conditions Unit
Maximum duty cycle
tDUTY
270pF, 4.2k 1.12v
(Error Amplifier)
Parameter Test Condition
Input threshold voltage input stability variation with temperature Input bias current Output voltage swing Output sink current Output source current Open-loop voltage amplification
VTdV VTdT
0.7v 6.5v
Unit 1.249 1.262 1.275
FB=0.7V FB=0.7V
0.05
Output section
Parameter Test Condition
Unit
High-level output voltage Low-level output voltage Rise time Fall time
Trise Tfall
IO=-30mA IO=+30mA CL=1000pF CL=1000pF
Operating Current
Parameter Test Condition
Supply current
DD-OFF DD-ON
Output "OFF"state =4.2k
Unit
Advanced Analog Technology, Inc.
January 2004
AAT1109
time constant soft start short circuit protection 1.Soft start
power AAT1109 operates soft start mode. capacitor Cscp connected starts charging constant current. soft start mode, voltage (VSCP) input comparator, that duty controlled VSCP. completion soft start operation, voltage stays low, input from soft start circuit comparator stay high, enter short circuit protection waiting state. Soft start time Ts(sec) 0.84 CSCP (uF) 2.Short circuit protection switching regulator output suddenly drops loading effect error amplifier output fixed VOM+ capacitor CSCP starts charging. When voltage reaches approximately 1.26V ,the output stays low. Once protection circuit operates, circuit recovered setting power supply. Short circuit detection time Tscp(sec) 0.84 CSCP (uF)
Advanced Analog Technology, Inc.
January 2004
AAT1109
Function Block Diagram
LATCH
UVLO
VREF
rr-A
Advanced Analog Technology, Inc.
January 2004
AAT1109
Application Circuit BOOST(step-up)
VOUT
AAT1109
Application Circuit (with charge pump)
VOUT
3*Vout
-Vout
AAT1109
Advanced Analog Technology, Inc.
January 2004
AAT1109
Boost Step-upTiming Chart
Reference input short circuit ldle period setting voltage Soft start setting voltage
1.262V
OUTPU
soft start
output short circuit
output short circuit
2.47V Lockout free
Tscp
Advanced Analog Technology, Inc.
January 2004
AAT1109
Package Dimension (Unit: Mil)
8-pin
DIMENSIONS MILLIMETERS SYMBOLS 1.47 0.10 -0.33 0.19 4.80 5.80 3.80 -0.38 NOM. 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
DEMINSIONS INCHES 0.058 0.004 -0.013 0.0075 0.189 0.228 0.150 -0.015 NOM. 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 0.00.
Advanced Analog Technology, Inc.
January 2004
AAT1109
Package Dimension (Unit: Mil)
8-pin TSSOP
Dimension
Millimeters
1.10 0.10 0.22 0.127 3.00 6.40 4.40 0.65 0.60
Inches
1.20 0.175 -3.10 6.60 4.50 -0.75
0.039 0.002 -0.114 0.244 0.169 -0.020
0.043 0.004 0.008 0.005 0.118 0.252 0.173 0.026 0.024
0.047 0.006 -0.122 0.260 0.177 -0.028
1.00 0.025 -2.90 6.20 4.30 -0.45
Advanced Analog Technology, Inc.
January 2004

Preliminary Provisional ONE-CHANNEL BOOST SWITCHING REGULATOR

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