Preliminary Provisional BUCK_BOOST BOOST CONTROLLER Features
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AAT1105A
Preliminary Provisional
BUCK_BOOST BOOST CONTROLLER
Features Complete Power Control Circuitry CH-1: buck_boost, CH-2: boost Under-voltage Lockout Protection Totem pole Output Output Short Circuit Protection Dead Time Control0 100% Wide Operating Frequency 10kHz 800kHz Shut Down Control Power Good Protection Range: 2.6V~ 6.5V
General Description
AAT1105A 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. AAT1105A contains step-up (boost) circuit (CH-2) inverting (buck_boost) circuit (CH-1). 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. With minimum number external components, AAT1105A series offers simple cost effective solution.
*Spec subject change without notice this document.
Configuration
VIEW
SHDN INV1 DTC1 OUT1 Vref PRDB INV2 DTC2 OUT2
(TSSOP-16 PACKAGE)
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Description
Name
SHDN INV1 DTC1 OUT1 OUT2 DTC2 INV2 PRDB Vref
External timing capacitance External timing resistance
Description
Shut down input pininternal pull 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 Power good output Timer latch setting Reference voltage (1.293V) output
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Absolute Maximum Ratings CHARACTERISTICS Supply voltage Input voltage (IN-, DTC, SHDN)
Output voltage Output current Operating free-air temperature range Storage temperature range Power dissipation
SYMBOL
Tope Tstg
VALUE
+0.3 -120/+120
UNIT
Recommended Operating Conditions
Supply voltage, Input voltage, INV1, INV2 Output voltage capacitor resistor (Note Oscillator frequency Output current, Iout1, Iout2 Operating free-air temperature
Symbol
15000 +50/-50
Unit
Tope
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Electrical Characteristics, VDD= 3.3V (Unless Otherwise Specified) (See Note Oscillator Parameter Test Condition Frequency 220pF, 5.6k
Frequency change with 2.6V 6.0V, 220pF, 5.6k
Unit
Under-voltage Protection
Parameter Test Condition Unit
Upper threshold voltage Lower threshold voltage Hysteresis VUPH VUPL
VUPH VUPL VHYS
1.81 1.57
2.03 1.79 0.24
2.25 2.01
Short Circuit Protection Control
Parameter Test Condition Unit
Input threshold voltage Input threshold voltage Short-circuit detect threshold voltage terminal source current Standy Voltage Latch Voltage
Ch-2 Ch-1
1.18 0.30 0.76 -1.4
1.29 0.37 0.85 -2.6
1.40 0.44 0.94 -3.8
VSTB
Shun Down Control
Parameter Test Condition Unit
Shut down enable voltage Shut down release voltage
Vsdl Vsdh
Note1: Typical values parameters specified
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Electrical Characteristics, 3.3V (Unless Otherwise Specified) (See Note (continued) Reference Voltage
Parameter Test Conditions
Unit
Internal reference Voltage Reference voltage Input voltage regulation Output regulation
Vrefi VREF
-1mA -1mA -1mA 2.6V 6.0V -0.1mA -1mA
0.622 0.641
0.66
1.280 1.293 1.306
(Error Amplifier)
Parameter Test Condition
Unit
±100
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=0.65V FB=0.65V
Common-mode rejection ratio CMRR
PRDB (Power Good Protection)
Parameter Test Conditions Unit
Level Output Voltage
Vdbl
Pull-High R20=100
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Electrical Characteristics, 3.3V (Unless Otherwise Specified) (See Note (continued) Dead Time Control Parameter Test Condition Unit Input bias current VDTC 1.0V
Input threshold voltage (DTC1) Input threshold voltage (DTC2) Latch input voltage (DTC1) Latch input voltage (DTC2) Latch mode source current (DTC1) Latch mode source current (DTC2)
V1d100
V2d0 V2d100 V1DT V2DT I1DT I2DT
Duty 10kHz Duty 100%, 10kHz Duty 10kHz Duty 100%, 10kHz 20µA 50µA DTC1=1.08V DTC2=0.48V
0.92 0.48 0.48 0.92 1.15
0.56 0.56
1.08 0.64 0.64 1.08
Output Stage
Parameter Test Condition
High-level output voltage Low-level output voltage Rise time Fail time Leakage current
Trise Tfail Ipeak
IO=-50mA IO=+50mA CL=1000pF CL=1000pF =6.0V
Unit
Operating Current
Parameter Test Condition
Unit
Supply current
DD-OFF DD-ON
Output "OFF "state
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Function Block Diagram
INV1
Vrefi 0.641V
Err-Amp
Scpcomp
OUT1
Vref 1.293V
INV2
Err-Amp Vref
OUT2
DTC1 DTC2
LATCH LATCH
UVLO
PRDB
Vref
SHDN SHUT_DOWN CONTROL
VREF
Vref
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Application Circuit
PRDB OUT1
INV1
VREF
AAT1105A
INV2
OUT2 SHDN SHDN VREF DTC1 DTC2
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Application Circuit
option circuit power good protection
PRDB
option circuit: Positive charge pump circuit
PRDB OUT1
PRDB
INV1
VREF
AAT1105A
INV2
option circuit discharge
OUT2 SHDN SHDN
VREF DTC1
DTC2
option circuit Negative charge pump circuit
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Buck_BoostInverting Timing Chart
1.0V
0.37V
0.56V
PWMOUTPUT OUTPUT
0.85V
SCPCOMP
2.03V
Lockout free
PRDB
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Boost Step-upTiming Chart CH-2
1.29V 1.0V
0.56V
PWMOUTPUT
OUTPUT
0.85V
SCPCOMP
2.03V
Lockout free
PRDB
Advanced Analog Technology, Inc.
January 2004
AAT1105A
Package Dimension (Unit: Mil)
Advanced Analog Technology, Inc.
January 2004
AAT1105A
******************** NOTE: Controlling dimension Dimension does include mold flash, burrs gate burrs. Mold flush, burrs gate burrs shall exceed 0.006"[0.15mm] end. Dimension "E1" does include interlead flash. interlead flash shall exceed 0.010"[0.25mm] side. Dimension does include dambar protrusion. Allowable dambar protrusion shall 0.003"[0.08mm] total excess dimension maximum material condition. dambar cannot located lower radius foot. Minimum space between protrusion adjacent lead 0.0028"[0.07mm] Tolerance: 0.010"[0.25mm] unless otherwise specified. Otherwise dimension follow acceptable spec. ********************
Advanced Analog Technology, Inc.
January 2004
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