AAT1104 AAT | Alldatasheet
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Technical content
Features
z Complete PWM Power Control Circuitry z Precision Reference：2.505V±1% (25 oC) z Under-voltage Lockout Protection z Open Drain Output z Output Short Circuit Protection z Low Dissipation Current：1.6mA z Dead Time Control：0 to 100% z Wide Operating Frequency： 10kHz to 800kHz z VDD range：4.0V to 6.5V Pin Configuration CT RT INV1 FB1 DTC1 GND OUT1 Vref NON2 SCP INV2 FB2 DTC2 OUT2 TOP VIEW (TSSOP-16 PACKAGE) NON1 VDD General Description The AAT1104/AAT1104A provides an integrated two-channel pulse-width-modulation (PWM) solution for the power supply of DC-DC system, this device offers the systems engineer the flexibility to tailor the power supply circuitry to a specific application. Each channel contains its own error amplifier, PWM comparator, dead–time control and output driver. The under-voltage protection, oscillator, shor t circuit protection and voltage reference circuit are common for the two channels. Both channel of AAT1104/AAT1104A can be used for DC/DC converter operations including step-up, step-down, and inverting. Dead-time control (DTC) can be set to provide 0% to 100% dead time by resistive divider network. Soft start can be implemented by paralleling the DTC resistor with a capacitor. Two dead time control inputs are assigned for Ch-1 and Ch-2 individually, and dead time control inputs can be used to control on / off operation. With a minimum number of external components, the AAT1104/AAT1104A offers a simple and cost effective solution. *Spec is subject to change without notice in this document.
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Pin Description Pin # Name I/O Description
1 CT I External timing capacitance
2 RT I External timing resistance
3 NON1 I Positive input for error amplifier 1
4 INV1 I Negative input for error amplifier 1
5 FB1 I Output for error amplifier 1
6 DTC1 I Output 1 dead time / soft start setting
7 OUT1 O Output 1
8 GND Ground
9 V DD I Power supply
10 OUT2 O Output 2
11 DTC2 I Output 2 dead time / soft start setting
12 FB2 I Output for error amplifier 2
13 INV2 I Negative input for error amplifier 2
14 NON2 I Positive input for error amplifier 2
15 SCP I Timer latch setting
16 V ref O Reference voltage (2.505V) output
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Absolute Maximum Ratings CHARACTERISTICS SYMBOL VALUE UNIT Supply voltage DDV 7 V Input voltage (IN-, DTC) IV DDV V Output voltage OV DDV +0.3 V Output current OI 120 mA Operating free-air temperature range opeT -20 to 85 oC Storage temperature range stgT -65 to 150 oC Power dissipation Pd 500 mW Recommended Operating Conditions Symbol Min Max Unit Supply voltage, DDV DDV 4.0 6.5 V Input voltage, IN1, IN2 V cm 0.5 1.6 V Output voltage OV 0 DDV V OSC capacitor TC 100 15000 pF OSC resistor (Note 1) TR 5.1 50 kΩ Oscillator frequency OSCf 10 800 kHz Output current, Iout1, Iout2 OI 100 mA Operating free-air temperature opeT -20 85 oC
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Electrical Characteristics, DDV = 5.0V (Unless Otherwise Specified) (See Note 1) Oscillator Parameter Test Condition Min Typ Max Unit Frequency OSCf TC = 220pF, TR = 10k Ω 320 400 480 KHz Frequency change with DDV dVf DDV = 4.0V to 6.0V, AT= 2 5 oC TC = 220pF, TR = 10k Ω 1 % Under-voltage Protection Parameter Test Condition Min Typ Max Unit Upper threshold voltage UPHV AT= 2 5 oC 2.6 2.9 3.2 V Lower threshold voltage UPLV AT= 2 5 oC 2.23 2.53 2.83 V Hysteresis ( UPHV – UPLV) HYSV AT= 2 5 oC 0.37 V Short Circuit Protection Control Parameter Test Condition Min Typ Max Unit Ch-1, 2 0.95 1.05 1.15 Input threshold voltage 1rV AAT1104A only 1.02 1.18 1.34 V 1.48 1.64 1.8 Short-circuit detect threshold voltage 2rV AAT1104A only 0.6 0.7 0.8 V -1.5 -2.5 -3.5 SCP terminal source current SCPI AAT1104A only -10 -15 -20 µA Standy Voltage V STB 50 100 mV Latch Voltage V LT 30 100 mV Note1: Typical values of all parameters are specified at AT =25 oC.
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Electrical Characteristics, DDV = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Reference Voltage Parameter Test Conditions Min Typ Max Unit Reference voltage REFV m A 1IREF −= , AT= 2 5 oC 2.48 2.505 2.53 V Input voltage regulation RIV m A 1IREF −= , VDD = 4.0V to 6.0V 1 5 mV Output regulation ROV m A 1.0IREF −= to -3mA 1 10 mV EA (Error Amplifier) Parameter Test Condition Min Typ Max Unit Input offset voltage IOV Ch-1,2, AV=1 6 mV Input bias current IBI Ch-1,2 ±15 ±100 nA Input voltage range IRV Ch-1,2 0.5 1.6 V Open-loop voltage amplification VDA 70 85 dB +OMV 2.3 2.5 Output voltage swing −OMV 0.7 0.9 V Output sink current +OMI FB=1.25V 3 20 mA Output source current −OMI FB=1.25V -45 -75 µA Common-mode rejection ratio CMRR 60 80 dB
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Electrical Characteristics, DDV = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Dead Time Control & PWM Parameter Test Condition Min Typ Max Unit Input bias current BDTI DTCV = 2V 0.1 1 µA Duty = 0%, OSCf = 10kHz 1.87 1.97 2.07 0dV AAT1104A only 1.85 2.05 2.25 Duty = 100%, OSCf = 10kHz 1.38 1.48 1.58 Input threshold voltage (DTC) 100dV AAT1104A only 1.2 1.45 1.7 V Latch input voltage V DT I DT = 40µA 2.28 2.48 V Latch mode source current I DT DTC1,2=0V -200 -560 µA Output Stage Parameter Test Condition Min Typ Max Unit Saturation voltage V SAT IO = 75mA（CH-1,2） 0.8 1.2 V Leakage current I peak V o =6.0V 5 µA Operating Current Parameter Test Condition Min Typ Max Unit OFFDDI − Output ”OFF “state 1.3 mASupply current ONDDI − RRT =10kΩ 1.6 mA
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Function Block Diagram SCP VREF UVLO FB1 NON1 INV1 NON2 INV2 FB2 DTC1 DTC2 SCP UVC LATCH UVC UVC Vref Vref Vref V DD RT GND CT LATCH PWM PWM UVC Err-Amp Err-Amp UVC OSC Vref V DD Scpcomp OUT1 OUT2
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Application Circuit AAT1104 AAT1104A OUT1 OUT2 VDD VDD Q1 VN1 C9L1 R11 R17 R18 VDD NON1 FB1 INV1 NON2 FB2 INV2 CT RT GND SCP DTC2 DTC1 VREF VREF R12 R13 VN1 VREF R3 VP2 VREF R14 R15 CT RT R8 R10 C5R9R7C4 C8 D3 VP3 VP2 C10 option circuit: charge pum p circuit R16 Step_up output Inverting output VDD VDD
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Timing Chart AAT1104 1.64V 2.53V Lockout free 1.97V 1.48V tDT 1.05V FB CT DTC PWMOUTPUT OUTPUT SCP SCPCOMP VDD
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Timing Chart AAT1104A 0.7V 2.53V Lockout free 2.05V 1.45V tDT 1.18V FB CT DTC PWMOUTPUT OUTPUT SCP SCPCOMP VDD
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 1 . 0 AAT1104/AAT1104A Package Dimension (Unit: Mil) A 2 1.00 1.05 0.039 0.041 C 0.127 0.005 e 0.65 0.026 y 0.076 0.003 D E A A1 12°b y e