AAT AAT1105A-T1 Buck boost and boost pwm controller Datasheet

Advanced Analog Technology, Inc.
AAT1105A
Details are subject to change without notice.
BUCK_BOOST & BOOST PWM CONTROLLER
Features
General Description
z
The AAT1105A provides an integrated two-channel
pulse-width-modulation (PWM) solution for the
power supply of DC-DC system. This device
offers system engineers the flexibility to tailor-make
the power supply circuitry for specific applications.
Each channel contains its own error amplifier,
PWM comparator, dead–time control (DTC), and
output driver. The under-voltage protection,
oscillator, short circuit protection (SCP) and voltage
reference circuit are the common features for the
two channels.
The AAT1105A contains one step-up (boost) circuit
at channel two (CH2) and one inverting
(buck_boost) circuit at channel one (CH1).
Dead-time control can be set to provide 0% to
100% dead-time through a resistive divider network.
Soft-start can be implemented by paralleling the
DTC resistor with a capacitor. Two dead-time
control inputs are assigned for CH1 and CH2
individually, and dead-time control inputs can be
used to control on / off operation.
The compact design and optimized external parts of
AAT1105A offers a simple and effective solution.
Complete PWM Power Control Circuitry
CH1: Buck_Boost, CH2: Boost
z
Under-Voltage Lockout (UVLO) Protection
z
Totem Pole Output
z
Output Short Circuit Protection
z
Dead-Time Control:0% to 100%
z
Wide Operating Frequency:
10kHz to 800kHz
z
Shutdown Control
z
Power Good Protection
z
VDD Range: 2.6V~6.5V
Pin Configuration
TOP VIEW
Ct
1
16
VREF
Rt
2
15
SCP
SHDN
3
14
PGO
IE1
4
13
IE2
OE1
5
12
OE2
DTC1
6
11
DTC2
OUT1
7
10
OUT2
GND
8
9
VDD
(TSSOP-16 PACKAGE)
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AAT1105A
Pin Description
Pin No
Name
Ct
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Rt
SHDN
IE1
OE1
DTC1
OUT1
GND
VDD
OUT2
DTC2
OE2
IE2
PGO
SCP
VREF
I/O
Description
- External Timing Capacitance
- External Timing Resistance
I
I
O
I
O
O
I
O
I
O
O
Shutdown Input Pin(Internal Pull "H")
Inverting Input of Error Amplifier 1
Output for Error Amplifier 1
Output 1 Dead-Time / Soft-Start Setting
Output 1
Ground
Power Supply
Output 2
Output 2 Dead-Time / Soft-Start Setting
Output of Error Amplifier 2
Inverting Input of Error Amplifier 2
Power Good Output Pin
Timer Latch Setting
Reference Voltage (1.293V) Output
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AAT1105A
Absolute Maximum Ratings
CHARACTERISTICS
Supply Voltage
Input Voltage ( IE − , DTC, SHDN)
VALUE
7
VDD
Output Voltage
SYMBOL
VDD
VI
VO
VDD +0.3
UNIT
V
V
V
Output Current
IO
− 120 /+120
mA
Operating Free-Air Temperature Range
TC
− 20 to +85
o
Tstorage
− 45 to +125
o
Pd
500
Storage Temperature Range
Power Dissipation
C
C
mW
Recommended Operating Conditions
Symbol
VDD
Vcm
Min
2.6
0.3
Unit
V
V
0
Max
6.5
1.5
VDD
VO
Oscillator (OSC) Capacitance
C OSC
100
15,000
pF
Oscillator (OSC) Resistance
R OSC
3
50
kΩ
Oscillator (OSC) Frequency
Output Current, I out1 , I out 2
f OSC
10
800
kHz
+50/ − 50
mA
Operating Free-Air Temperature
TC
Supply Voltage, VDD
Input Voltage, IE1, IE2
Output Voltage
IO
− 20
85
V
o
C
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AAT1105A
Electrical Characteristics, VDD = 3.3V (Unless Otherwise Specified) (See Note 1)
Oscillator
Parameter
Test Condition
Min Typ
C OSC = 220pF, R OSC =
f OSC
320
400
Frequency
5.6kΩ
VDD = 2.6V to 6.0V,
TC = 25 oC
Frequency Changes with
f ∆V
1
VDD
C OSC = 220pF,
R OSC = 5.6kΩ
Max Unit
480
kHz
-
%
Under-Voltage Protection
Parameter
Test Condition
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis ( VUPH – VUPL )
VUPH
VUPL
VHYS
Min
Typ
Max
Unit
o
1.81
2.03
2.25
V
o
1.57
1.79
2.01
V
o
-
0.24
-
V
TC = 25 C
TC = 25 C
TC = 25 C
Short Circuit Protection Control
Parameter
Test Condition
Min
Typ
Max
Unit
Input Threshold Voltage
Vr 2
CH2
1.81
1.29
1.40
V
Input Threshold Voltage
Short-Circuit Detect
Threshold Voltage
SCP Terminal Source
Current
Stand-by Voltage
Latch Voltage
Vr1
CH1
0.30
0.37
0.44
V
Vtscd
0.76
0.85
0.94
V
I SCP
− 3 .8
− 2 .6
− 1 .4
µA
50
30
100
100
mV
mV
Min
Typ
Max
Unit
-
-
0.5
V
2.0
-
-
V
VSTB
VLT
Shutdown Control
Parameter
Test Condition
Shutdown Enable Voltage
Shutdown Release Voltage
VSE
VSR
o
TC = 25 C
o
TC = 25 C
Note 1: Typical values of all parameters are specified at TC =25 oC.
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AAT1105A
Electrical Characteristics, VDD = 3.3V (Unless Otherwise Specified) (See Note 1) (Cont.)
Reference Voltage
Parameter
Test Conditions
Min
Typ
Max
Internal Reference Voltage
VREFi
I REF = −1mA , TC = 25 C
0.622 0.641 0.660
Reference Voltage
VREF
I REF = −1mA , TC = 25 oC
1.280 1.293 1.306
Input Voltage Regulation
VRI
Output Regulation
VRO
o
I REF = −1mA ,
VDD = 2.6V to 6.0V
I REF = −0.1mA to − 1 mA
Unit
V
-
1
10
mV
-
1
6
mV
Min
Typ
-
-
6
mV
0.5
±15
-
±100
1.5
nA
V
A VO
70
85
-
dB
VOS+
1.7
2.0
-
VOS−
-
0.2
0.4
EA (Error Amplifier)
Parameter
Test Condition
Input Offset Voltage
VIO
CH1,CH2, Unity Gain
Input Bias Current
Input Voltage Range
Open-Loop Voltage
Amplification
I IB
VIR
CH1, CH2
CH1, CH2
Output Voltage Swing
Max Unit
V
Output Sink Current
I OS+
OE=0.65V
3
10
-
mA
Output Source Current
I OS−
OE=0.65V
-
− 65
− 45
µA
60
80
-
dB
Min
Typ
-
0.2
Common-Mode Rejection
Ratio
CMRR
PRDB (Power Good Protection)
Parameter
Test Condition
Low Level Output Voltage
Vdbl
Pull-High
R 20 = 100kΩ
Max Unit
0.4
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Advanced Analog Technology, Inc.
AAT1105A
Electrical Characteristics, VDD = 3.3V (Unless Otherwise Specified) (See Note 1) (Cont.)
Dead Time Control & PWM
Parameter
Test Condition
Min Typ Max Unit
I IB
VDTC = 1.0V
Input Bias Current
0.1
1.0
µA
V1d 0
Duty = 0%, f OSC = 10kHz
0.92
1.00
1.08
V1d100
Duty = 100%,
f OSC = 10kHz
0.48
0.56
0.64
V2d 0
Duty = 0%, f OSC = 10kHz
0.48
0.56
0.64
V2d100
Duty = 100%,
f OSC = 10kHz
0.92
1.00
1.08
Latch Input Voltage (DTC1)
V1DTC
I DTC = 20µA
1.15
1.20
-
V
Latch Input Voltage (DTC2)
Latch Mode Source Current
(DTC1)
Latch Mode Source Current
(DTC2)
V2 DTC
I DTC = 50µA
-
0.2
0.4
V
I1DTC
DTC1=1.08V
-
− 45
− 30
µA
I 2 DTC
DTC2=0.48V
150
200
-
µA
Input Threshold
(DTC1)
Voltage
Input Threshold
(DTC2)
Voltage
V
V
Output Stage
Parameter
Test Condition
High-Level Output Voltage
VOH
I O = − 50 mA
Min
1.8
Low-Level Output Voltage
VOL
I O =+50mA
-
0.8
1.2
V
Rise Time
t RISE
C L =1,000pF
-
100
-
ns
Fail Time
Leakage Current
Capacitance at the Output
Pin
t FALL
I LEAK
C L =1,000pF
-
100
-
ns
VO =6.0V
-
-
5
µA
Min
Typ
-
1.8
-
2.0
CL
Typ
2.2
Max Unit
V
Operating Current
Parameter
Supply Current
Test Condition
I DD−OFF
I DD−ON
Output “OFF” State
R OSC = 10kΩ
Max Unit
mA
-
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AAT1105A
Block Diagram
OE1
IE1
VDD
Vr1
VREFi
1.233V
Err-Amp
SCP
Comp
OUT1
PWM
GND
Vr2
UVC
VREFi
1.233V
VDD
OUT2
IE2
OE2
Err-Amp
PWM
VREF
Ct
UVC
DTC1
OSC
Rt
DTC2
UVC
UVC
LATCH
VDD
LATCH
UVLO
SCP
VDD
PGO
SCP
UVC
SHDN
SHUTDOWN
CONTROL
VREF
VREF
VREF
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AAT1105A
Application Circuit 1
VDD
C11
U1
VDD
PGO
Q1
OUT1
VN1
VN1
R5
D1
OE1
L1
C1
R1
C9
IE1
R2
AAT1105A
VREF
VP2
L2
R6
OE2
VP2
C2
R3
D2
Q2
IE2
OUT2
R4
C10
SHDN
SHDN
VREF
R7
Ct
R9
C5
C20
DTC1
Rt
DTC2
C4
GND
Ct
R8
R10
SCP
Rt
CSCP
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AAT1105A
Application Circuit 2
Optional Circuit 3:
for power good protection
VDD
Optional Circuit:
Positive charge pump circuit
Q3
R20
C11
VP3
PGO
U1
VDD
PGO
D4
OUT1
VN1
Q1
R5
D1
OE1
R1
L1
C1
VN1
C7
D3
C8
PGO
C9
R12
IE1
R2
R11
Q4
AAT1105
VREF
L2
VP2
R6
OE2
R3
C2
IE2
Optional Circuit 2:
for Vp3 discharge
VP2
D2
Q2
OUT2
R4
C10
SHDN
SHDN
C13
VN2
VREF
R7
Ct
R9
C5
D6
DTC1
Rt
C14
DTC2
C4
GND
Ct
D5
C20
R8
Optional Circuit :
Negative charge pump circuit
R10
SCP
Rt
CSCP
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AAT1105A
Buck-Boost(Inverting) Timing Chart (CH1)
1.0V
OE
DTC
0.37V
0.56V
PWM OUTPUT
OUTPUT
0.85V
SCP
tSCP
SCP COMP
2.03V
VDD
LOCKOUT FREE
PGO
Note:
t SCP ≅
C SCP Vr 2
I SCP
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AAT1105A
Boost (Step-up)Timing Chart (CH-2)
1.29V
1.0V
DTC
OE
0.56V
PWM
OUTPUT
OUTPUT
0.85
V
SCP
tSCP
SCP COMP
2.03V
VDD
LOCKOUT
FREE
PGO
Note:
t SCP ≅
C SCP Vr 2
I SCP
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AAT1105A
Package Dimension
16-Pin TSSOP
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AAT1105A
Package Dimension (Cont.)
SYMBOLS
DIMENSIONS IN MILLIMETERS
DEMINSIONS IN INCHES
MIN
TYP
MAX
MIN
TYP
MAX
A
1.05
1.10
1.20
0.041
0.043
0.047
A1
0.05
0.10
0.15
0.002
0.004
0.006
A2
------
1.00
1.05
------
0.039
0.041
b
0.20
0.25
0.28
0.008
0.010
0.011
C
------
0.127
------
------
0.005
------
D
4.900
5.075
5.100
0.1930
0.1998
0.2000
E
6.20
6.40
6.60
0.244
0.252
0.260
E1
4.30
4.40
4.50
0.170
0.173
0.177
e
------
0.65
------
------
0.026
------
L
0.50
0.60
0.70
0.020
0.024
0.028
y
------
------
0.076
------
------
0.003
θ
0
o
4
o
8
o
0
o
4
o
8o
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 MILLIMETERS] UNLESS OTHERWISE SPECIFIED.
6. OTHERWISE DIMENSION FOLLOW ACCEPTABLE SPEC.
7. REFERENCE DOCUMENT: JEDEC SPEC MO-153.
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AAT1105A
Tape and Reel
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AAT1105A
Tape and Reel (Cont.)
NOTE:
1.
2.
3.
4.
5.
6.
10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE ± 0.2 MILLIMETERS.
CAMBER NOT TO EXCEED 1 MILLIMETER IN 100 MILLIMETERS.
MATERIAL: ANTI-STATIC BLACK ADVANTEK POLYSTYRENE.
A 0 AND B 0 MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET.
K 0 MEASURED FROM A PLANE ON THE INSIDE BOTTOM OF THE POCKET TO THE TOP SURFACE OF
THE CARRIER.
POCKET POSITION RELATIVE TO SPROCKET HOLE MEASURED AS TRUE POSITION OF POCKET, NOT
POCKET HOLE.
Part Marking
TSSOP16 Top Marking
AAT1105A
XXXXXX
TSSOP16 Back Marking
YYWW
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AAT1105A
Ordering Information
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