Preliminary Provisional 2-CHANNEL STEP-UP CONTROLLERS WITH ADJUST
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AAT1108
Preliminary Provisional
2-CHANNEL STEP-UP CONTROLLERS WITH ADJUSTABLE
Features Complete Power Control Circuitry Adjustable Regulator Under-voltage Lockout Protection Totem pole Output Output Short Circuit Protection Dead Time Control0 100% Wide Operating Frequency 10kHz 800kHz General Description AAT1108 series provides integrated two-channel pulse-width-modulation (PWM) solution power supply DC-DC system, this device offers systems engineer flexibility tailor power supply circuitry specific application. Each channel contains error amplifier, comparator, dead-time control output driver. under-voltage protection, oscillator, short circuit protection voltage reference circuit common channels. AAT1108 contains boost (step-up) exclusive circuits. Dead-time control (DTC) provide 100% dead time resistive divider network. Soft start implemented paralleling resistor with capacitor. dead time control inputs assigned Ch-1 Ch-2 individually, dead time control inputs used control operation. maximum output currents regulator enlarged connect N_MOS bipolar) source follow stage out3 pin.
*Spec subject change without notice this document.
Configuration
VIEW
INV3 INV1 DTC1 OUT1 Vref OUT3 INV2 DTC2 OUT2
(TSSOP-16 PACKAGE)
Advanced Analog Technology, Inc.
January 2004
AAT1108
Description Name INV3 INV1 DTC1 OUT1 OUT2 DTC2 INV2 OUT3 Vref External timing capacitance External timing resistance Negative input amplifier Negative input error amplifier Output error amplifier Output dead time soft start setting Output Ground Power supply Output Output dead time soft start setting Output error amplifier Negative input error amplifier output Timer latch setting Reference voltage (2.505V) output Description
Advanced Analog Technology, Inc.
January 2004
AAT1108
Absolute Maximum Ratings CHARACTERISTICS Supply voltage Input voltage (IN-, DTC) Output voltage SYMBOL VALUE UNIT
+0.3 -120/+120
Output current Operating free-air temperature range Storage temperature range Power dissipation
Recommended Operating Conditions
Tope Tstg
Supply voltage, Input voltage, INV1, INV2, INV3 Output voltage capacitor resistor (Note Oscillator frequency Output current, Iout1, Iout2 current, Iout3 (Vout3 3.3v) Operating free-air temperature
Symbol
15000
Unit
Tope
+50/-50
Advanced Analog Technology, Inc.
January 2004
AAT1108
Electrical Characteristics, 5.0V (Unless Otherwise Specified) (See Note Oscillator
Parameter Test Condition
Frequency Frequency change with
220pF, 4.0V 6.0V, 220pF,
Unit
Under-voltage Protection
Parameter Test Condition Unit
Upper threshold voltage Lower threshold voltage Hysteresis VUPH VUPL
Short Circuit Protection Control
Parameter
VUPH VUPL VHYS
2.23
2.53 0.37
2.83
Test Condition
Unit
Input threshold voltage Short-circuit detect threshold voltage terminal source current Standy Voltage Latch Voltage
Ch-1,
1.48 -1.5
1.64 -2.5
2.65 -3.5
VSTB
Note1: Typical values parameters specified
Advanced Analog Technology, Inc.
January 2004
AAT1108
Electrical Characteristics, 5.0V (Unless Otherwise Specified) (See Note (continued) Reference Voltage
Parameter Test Conditions
Unit
Internal reference Voltage Reference voltage Input voltage regulation Output regulation
Vrefi
-1mA 1.220 -1mA -1mA 4.0V 6.0V -0.1mA -1mA
1.233 1.246
VREF
2.430 2.505 2.580
(Error Amplifier)
Parameter Test Condition
Input offset voltage Input bias current Input voltage range Open-loop voltage amplification Output voltage swing Output sink current Output source current
Ch-1,2, AV=1 Ch-1,2 Ch-1,2 FB=1.25V FB=1.25V
Unit
±100
Common-mode rejection ratio CMRR
Advanced Analog Technology, Inc.
January 2004
AAT1108
Electrical Characteristics, 5.0V (Unless Otherwise Specified) (See Note (continued) Dead Time Control Parameter Test Condition Unit Input bias current VDTC
Input threshold voltage (DTC) Latch input voltage Latch mode source current
Output Stage
Parameter
Duty 10kHz Vd100 Duty 100%,
10kHz 100µA
1.38 1.87
1.48 1.97
1.58 2.07
DTC1,2=2.0V
Test Condition
High-level output voltage Low-level output voltage Rise time Fail time Leakage current
Operating Current
Parameter
Trise Tfail Ipeak
IO=-50mA IO=+50mA CL=1000pF CL=1000pF =6.0V
Unit
Test Condition
Supply current
DD-OFF DD-ON
Output "OFF" state
Unit
(Vout3 3.3V)
Parameter Test Condition
Output voltage Line Regulation Load Regulation
VDD=5V,Vout3=3.3V VDD=4V~6.5V, Iout3=10mA Iout3=1mA~30mA
3.17
0.08
Unit 3.43
Advanced Analog Technology, Inc.
January 2004
AAT1108
Function Block Diagram
INV1
Err-Amp 1.233V Vrefi
Scpcomp
OUT1
Vrefi 1.233V
INV2 DTC1
Err-Amp
OUT2
DTC2
LATCH LATCH
UVLO
INV3
Vrefi 1.253V Vref
OUT3
VREF
Vref
Advanced Analog Technology, Inc.
January 2004
AAT1108
Application Circuit
OUT1
INV1
AAT1108
OUT2
INV2
OUT3
INV3
VREF
DTC1 DTC2
Advanced Analog Technology, Inc.
January 2004
AAT1108
Application Circuit
option circuit charge pump circuit
OUT1
INV1
OUT2
INV2 OUT3
AAT1108
INV3 VREF
DTC1 DTC2
option circuit: enlarge output current
Advanced Analog Technology, Inc.
January 2004
AAT1108
Boost Step-upTiming Chart
2.4V 1.97V
1.48V
PWMOUTPUT
OUTPUT
1.64V
SCPCOMP
2.53V
Lockout free
Advanced Analog Technology, Inc.
January 2004
AAT1108
Package Dimension (Unit: Mil)
Advanced Analog Technology, Inc.
January 2004
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