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Advanced Analog Technology, Inc.
AAT1351
Details are subject to change without notice
2-CHANNEL SWITCHING REGULATOR
FEATURES
Complete PWM Power Control Circuitry Under-Voltage Lockout (UVLO) Protection Open Drain Output Output Short Circuit Protection Low Dissipation CurrentG 1.6mA Dead-Time ControlG 0% to 100% Wide Operating FrequencyG 10 kHz to 800 kHz
GENERAL DESCRIPTION
The AAT1351 provides an integrated two-channel pulse-width-modulation (PWM) solution for the power supply of DC-DC system; this device offers the systems engineer 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 and voltage reference circuit are the common features for the two channels. Both channels of AAT1351 can be used for DC-DC converter operations including step-up, step-down, and inverting. 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 channel 1 (CH1) and channel 2 (CH2) individually, and deadtime control inputs can be used to control on / off operation. With a minimum number of external components, the AAT1351 offers a simple and cost effective solution.
VDD RangeG 4.0V to 14.0V
PIN CONFIGURATION
TOP VIEW
Ct Rt NE1 IE1 OE1 DTC1 OUT1 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VREF SCP NE2 IE2 OE2 DTC2 OUT2 VDD
SOP-16 PACKAGE
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AAT1351
PIN DESCRIPTION
PIN NO NAME 1 Ct I/O DESCRIPTION I External Timing Capacitance I External Timing Resistance
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Rt NE1 IE1 OE1 DTC1 OUT1 GND VDD OUT2 DTC2 OE2 IE2 NE2 SCP VREF
Noninverting Input of Error Amplifier 1 Inverting Input of Error Amplifier 1 Output of Error Amplifier 1 Output 1 Dead-Time / Soft-Start Setting Output 1 Ground I Power Supply O Output 2 I Output 2 Dead-Time / Soft-Start Setting I Output of Error Amplifier 2 I Inverting Input of Error Amplifier 2 I Noninverting Input of Error Amplifier 2 I Timer Latch Setting O Reference Voltage (2.5V) Output
I I I I O
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AAT1351
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTICS SYMBOL VDD VI VO VALUE 14.0 VDD UNIT V V
Supply Voltage Input Voltage ( IE - , DTC) Output Voltage Output Current Operating Free-Air Temperature Range Storage Temperature Range Power Dissipation
VDD +0.3 120
- 20 to +85 - 45 to +125
V mA
o o
IO TC
Tstorage
C C
Pd
500
mW
RECOMMENDED OPERATING CONDITIONS
Supply Voltage, VDD Input Voltage, IE1, IE2 Output Voltage Oscillator (OSC) Capacitance Oscillator (OSC) Resistance Oscillator (OSC) Frequency Output Current, I OUT1 , I OUT 2 Operating Free-Air Temperature
SYMBOL VDD Vcm MIN 4.0 MAX 14.0 UNIT V
0.5 0 100 5.1 10 - 20
1.6 VDD 15,000 50.0 800 100 85
V V pF
k
VO C OSC R OSC f OSC IO TC
kHz mA
o
C
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AAT1351
ELECTRICAL CHARACTERISTICS, VDD = 6.0V (UNLESS OTHERWISE SPECIFIED) (SEE NOTE 1)
OSCILLATOR PARAMETER
TEST CONDITION
MIN
TYP MAX UNIT
Frequency
f OSC
C OSC = 330pF, R OSC = 10 k VDD = 4.0V to 14.0V, TC = 25 oC C OSC = 330pF, R OSC = 10 k
160
200
240
kHz
Frequency Changes with VDD
f V
-
1
-
%
UNDER VOLTAGE PROTECTION PARAMETER Upper Threshold Voltage VUPH
TEST CONDITION TC = 25 oC
Lower Threshold Voltage Hysteresis ( VUPH - VUPL )
VUPL VHYS
TC = 25 oC TC = 25 oC
MIN TYP MAX UNIT 2.9 V 2.53 V 0.37 V
SHORT CIRCUIT PROTECTION CONTROL PARAMETER TEST CONDITION
MIN
TYP MAX UNIT
Input Threshold Voltage Short Circuit Detect Threshold Voltage SCP Terminal Source Current Stand-by Voltage Latch Voltage
Vr1 Vr 2 I SCP VSTB VLT
CH1, CH2
0.65
- 20
1.18 0.70
- 15
0.75
- 10
V V
A
TC =25 oC.
50 30
100 100
mV mV
Note 1: Typical values of all parameters are specified at
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AAT1351
ELECTRICAL CHARACTERISTICS, VDD = 6.0V (UNLESS OTHERWISE SPECIFIED) (SEE NOTE 1) (CONT.)
REFERENCE VOLTAGE PARAMETER
Reference Voltage Input Voltage Regulation Output Regulation
EA (ERROR AMPLIFIER) PARAMETER
VREF VRI VRO
TEST CONDITION I REF = -1mA , TC = 25 oC
MIN
TYP MAX UNIT
2.4 -
2.5 1 1
2.6 5 10
V mV mV
I REF = -1mA , VDD = 4.0V to 14.0V I REF = -0.1mA to - 3.0 mA
Input Offset Voltage Input Bias Current Input Voltage Range Open-Loop Voltage Gain Output Voltage Swing Output Sink Current Output Source Current Common-Mode Rejection Ratio
VIO I IB VIR A VO VOS+ VOS- I OS+ I OS- CMRR
TEST CONDITION CH1, CH2, Unity Gain
MIN
TYP MAX UNIT
0.5 70 2.3 -
15 85 2.5 0.7 20
- 45
6 100 1.6 0.9 -
mV nA V dB V mA
A
CH1, CH2 CH1, CH2
OE=1.25V OE=1.25V
3
- 75
60
80
dB
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AAT1351
ELETRICAL CHARACTERISTICS, VDD = 6.0V (UNLESS OTHERWISE SPECIFIED) (SEE NOTE 1) (CONT.)
DEAD-TIME CONTROL & PWM PARAMETER I IB Input Bias Current TEST CONDITION VDTC = 2V MIN TYP MAX UNIT
1.79 1.32 2.28
0.1 1.97 1.48 2.48
1.0 2.15
A
Vd 0 Input Threshold Voltage (DTC)
Duty = 0%, f OSC = 10kHz
V Vd100 Duty = 100%, f OSC = 10kHz 1.64 V
A
Latch Input Voltage Latch Mode Source Current
OUTPUT STAGE PARAMETER
VDTC IDT = 40A I DTC DTC1, DTC2=0V
- 560 - 200
Saturation Voltage Leakage Current
OPERATING CURRENT PARAMETER
VSAT I LEAK
TEST CONDITION IO = 75mA] CH1, CH2^
MIN
TYP MAX UNIT
-
0.8 -
1.2 5
VO =14.0V
V A
TEST CONDITION
MIN
TYP MAX UNIT
I DD-OFF Supply Current I DD-ON
Output "OFF" State R OSC = 10k
-
1.3 1.6
1.8 2.4
mA mA
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AAT1351
BLOCK DIAGRAM
OE1 NE1 IE1
Err-Amp SCP Comp PWM
OUT1
GND
UVC
NE2 IE2 OE2
Err-Amp PWM VREF UVC
OUT2
Ct
DTC1 OSC
VREF UVC
Rt
DTC2
UVC LATCH
UVLO
VDD
VDD
LATCH
SCP SCP
UVC
VREF
VREF
VREF
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AAT1351
APPLICATION CIRCUIT
VREF
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AAT1351
TIMGING CHART
2.05V
OE DTC
1.18V
1.45V
PWM OUTPUT OUTPUT
0.7V
SCP
tSCP
SCP COMP
2.53V
VDD
LOCKOUT FREE
Note: t SCP
C SCP Vr 2 I SCP
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AAT1351
PACKAGE DIMENSION
16-PIN SOP
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AAT1351
PACKAGE DIMENSION (CONT.)
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AAT1351
PACKAGE DIMENSION (CONT.)
SYMBOLS A A1 A2 b C D E E1 e L y
NOTE: 1. 2. 3.
DIMENSIONS IN MILLIMETERS MIN TYP MAX 1.47 1.60 1.73 0.10 -----0.25 -----1.45 -----0.33 0.41 0.51 0.19 0.20 0.25 9.80 9.91 10.01 5.79 5.99 6.20 3.81 3.91 3.99 -----1.27 -----0.38 0.71 1.27 ----------0.076 o -----0 8o
DEMINSIONS IN INCHES MIN TYP MAX 0.058 0.063 0.068 0.004 -----0.010 -----0.057 -----0.013 0.016 0.020 0.0075 0.0080 0.0098 0.386 0.390 0.394 0.228 0.236 0.244 0.150 0.154 0.157 -----0.050 -----0.015 0.028 0.050 ---------0.003 o -----0 8o
4.
5. 6. 7.
CONTROLLING DIMENSION: INCH LEAD FRAME MATERIAL: COPPER 194 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 SAHLL NOT EXCEED 0.010" [0.25 MILLIMETERS] PER SIDE. 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]. TOLERANCE: 0.010" [0.25 MILLIMETERS] UNLESS OTHERWISE SPECIFIED. OTHERWISE DIMENSION FOLLOW ACCEPTABLE SPEC. REFERENCE DOCUMENT: JEDEC SPEC MS-012
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AAT1351
TAPE AND REEL
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AAT1351
TAPE AND REEL (CONT.)
X.XXX X X.XXX X.XX X.X X
0.0025 0.006
0.025 0.10 0.25
UNIT: MILLIMETERS
NOTE: 1. 2. 3. 4.
10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE 0.2. CHAMBER NOT TO EXCEED 1 MILLIMETER IN 100 MILLIMETERS. MATERIAL: BLACK ADVANTEK POLYSTYRENE. A 0 AND B 0 MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET.
5. 6.
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.
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AAT1351
PART MARKING
SOP16 TOP MARKING
AAT1351 BXXXXX.X YYWW TAIWAN
LOT NO. DATE CODE
(0416 = 16th week of Year 2004)
NOTE: SOP16 HAS NO BACK MARKING.
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AAT1351
ORDERING INFORMATION
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