Advanced Analog Technology, Inc. AAT1108 Preliminary and Provisional 2-CHANNEL STEP-UP PWM CONTROLLERS WITH ADJUSTABLE LDO Features General Description z Complete PWM Power Control Circuitry z Adjustable LDO Regulator z Under-voltage Lockout Protection z Totem pole Output z Output Short Circuit Protection z Dead Time Control：0 to 100% z Wide Operating Frequency： The AAT1108 series 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, short circuit protection and voltage reference circuit are common for the two channels. The AAT1108 contains two boost (step-up) exclusive circuits. 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. The maximum output currents of LDO regulator can be enlarged by connect a N_MOS FET (or NPN bipolar) as a source follow stage at out3 pin. 10kHz to 800kHz Pin Configuration TOP VIEW CT 1 16 Vref RT 2 15 SCP INV3 3 14 OUT3 INV1 4 13 INV2 FB1 5 12 FB2 DTC1 6 11 DTC2 OUT1 7 10 OUT2 GND 8 9 VDD (TSSOP-16 PACKAGE) *Spec is subject to change without notice in this document. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1108 Pin Description Pin # Name I/O Description 1 CT I External timing capacitance 2 RT I External timing resistance 3 INV3 I Negative input for LDO amplifier 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 9 VDD 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 OUT3 I LDO output 15 SCP I Timer latch setting 16 Vref O Reference voltage (2.505V) output Ground I Power supply – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1108 Absolute Maximum Ratings CHARACTERISTICS Supply voltage Input voltage (IN-, DTC) Output voltage SYMBOL VDD VI VO VALUE 7 VDD VDD +0.3 UNIT V V V Output current IO -120/+120 mA Operating free-air temperature range Tope -20 to 85 o o Storage temperature range Tstg -65 to 150 Power dissipation Pd 500 C C mW Recommended Operating Conditions Symbol VDD Vcm VO Min 4.0 0.5 0 OSC capacitor OSC resistor (Note 1) Oscillator frequency CT RT f OSC 100 5.1 10 Output current, Iout1, Iout2 Out put current, Iout3 (Vout3 = 3.3v) IO2 IO3 Operating free-air temperature Tope Supply voltage, VDD Input voltage, INV1, INV2, INV3 Output voltage -20 Max 6.5 1.6 VDD 15000 50 800 Unit V V V +50/-50 mA +30 mA 85 – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. pF kΩ kHz o C V 0.1 Advanced Analog Technology, Inc. AAT1108 Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) Oscillator Parameter Test Condition Frequency f OSC C T = 220pF, R T = 10kΩ Frequency change with VDD f dV VDD = 4.0V to 6.0V, TA = 25 oC C T = 220pF, R T = 10kΩ Min 320 Typ 400 Max Unit 480 KHz 1 % Under-voltage Protection Parameter Test Condition o Min Typ Max Unit Upper threshold voltage VUPH TA = 25 C 2.6 2.9 3.2 V Lower threshold voltage VUPL TA = 25 oC 2.23 2.53 2.83 V Hysteresis ( VUPH – VUPL ) VHYS TA = 25 oC 0.37 V Short Circuit Protection Control Parameter Test Condition Ch-1, 2 Min Typ Max 2.1 2.4 2.65 Unit Input threshold voltage Vr1 Short-circuit detect threshold voltage SCP terminal source current Vr 2 1.48 1.64 1.8 V V I SCP VSTB VLT -1.5 -2.5 -3.5 µA 50 30 100 100 mV mV Standy Voltage Latch Voltage Note1: Typical values of all parameters are specified at TA =25 oC. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1108 Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Reference Voltage Parameter Test Conditions Min Internal reference Voltage Vrefi I REF = −1mA , TA = 25 C 1.220 Reference voltage VREF I REF = −1mA , TA = 25 oC Input voltage regulation VRI Output regulation VRO I REF = −1mA , VDD = 4.0V to 6.0V I REF = −0.1mA to -1mA o Typ Max Unit 1.233 1.246 2.430 2.505 2.580 1 5 1 V mV mV EA (Error Amplifier) Parameter Test Condition Input offset voltage VIO Ch-1,2, AV=1 Input bias current Input voltage range Open-loop voltage amplification Output voltage swing I IB VIR A VD Ch-1,2 Ch-1,2 VOM + Min Typ Max Unit 6 mV ±15 ±100 1.6 0.5 70 85 nA V dB 2.3 2.5 V 0.7 VOM − 0.9 Output sink current I OM + FB=1.25V 3 20 mA Output source current I OM − FB=1.25V -45 -75 µA 60 80 dB Common-mode rejection ratio CMRR – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1108 Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Dead Time Control & PWM Parameter Test Condition Min Typ Max Unit 0.1 1 µA Input bias current I BDT VDTC = 2V Input threshold voltage (DTC) Vd 0 Duty = 0%, f OSC = 10kHz Vd100 Duty = 100%, Latch input voltage VDT f OSC = 10kHz IDT = 100µA Latch mode source current IDT DTC1,2=2.0V 1.38 1.48 1.58 1.87 1.97 2.07 0.1 0.3 200 500 V V µA Output Stage Parameter Test Condition High-level output voltage Low-level output voltage Rise time Fail time Leakage current VOH VOL Trise Tfail Ipeak IO=-50mA IO=+50mA CL=1000pF CL=1000pF Vo =6.0V Min 3.6 Typ 4.0 0.8 100 100 Max Unit V 1.2 V nS nS 5 µA Min Max Unit mA Operating Current Parameter Supply current Test Condition I DD−OFF Output ”OFF” state Typ 1.8 I DD−ON PRT =10 k 2.0 mA Typ 3.3 0.08 Max Unit 3.43 V 0.3 % LDO (Vout3 = 3.3V) Parameter Test Condition Output voltage Line Regulation Vrd LRI Load Regulation LRO VDD=5V,Vout3=3.3V VDD=4V~6.5V, Iout3=10mA Iout3=1mA~30mA Min 3.17 – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. 0.1 % V 0.1 Advanced Analog Technology, Inc. AAT1108 Function Block Diagram FB1 VDD INV1 Scpcomp Err-Amp 1.233V Vrefi OUT1 PWM GND Vr1 VDD UVC Vrefi 1.233V OUT2 INV2 FB2 Err-Amp PWM DTC1 CT UVC DTC2 OSC RT UVC UVC LATCH VDD SCP INV3 OUT3 LATCH UVLO Vref VREF VDD SCP UVC Vrefi 1.253V – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. Vref V 0.1 Advanced Analog Technology, Inc. AAT1108 Application Circuit 1 VDD C11 L1 VP1 U1 VDD D1 OUT1 VP1 C1 Q1 C9 R5 VDD FB1 R1 INV1 L2 R2 D2 AAT1108 VP2 R6 C2 VP2 Q2 OUT2 FB2 C10 R3 VP3 OUT3 INV2 R11 R4 INV3 C12 R12 VREF C20 R9 R7 CT DTC1 RT DTC2 GND C5 R10 R8 SCP C4 RT CT C3 – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1108 Application Circuit 2 option circuit 1: charge pump circuit VDD VN3 C8 D4 C11 D3 L1 VDD D1 OUT1 VP1 C1 C7 VP1 U1 C9 Q1 R5 VDD FB1 R1 INV1 L2 R2 D2 VP2 Q2 VP2 R6 C2 OUT2 FB2 C10 R3 VDD INV2 OUT3 Q3 VP3 R4 AAT1108 R11 C12 INV3 R12 VREF C20 R9 R7 CT option circuit: enlarge output current DTC1 RT DTC2 GND C5 R10 R8 SCP C4 RT CT C3 – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1108 Boost （Step-up）Timing Chart 2.4V 1.97V DTC CT FB 1.48V PWMOUTPUT OUTPUT 1.64V SCP tDT SCPCOMP 2.53V VDD Lockout free – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1108 Package Dimension (Unit: Mil) D E 1 E A 2 A 1 A 12° e b y D IM E N S IO N S A A1 A2 b C D E E1 e L y Θ M IN 1 .0 5 0 .0 5 IN M IL L IM E T E R S 0 .5 NOM 1 .1 0 0 .1 0 1 .0 0 0 .2 5 0 .1 2 7 5 .0 7 5 6 .4 0 4 .4 0 0 .6 5 0 .6 0 0° 4° 0 .2 0 4 .9 0 6 .2 0 4 .3 0 D IM E N S IO N S IN M AX 1 .2 0 0 .1 5 1 .0 5 0 .2 8 M IN 0 .0 4 1 0 .0 0 2 5 .1 0 6 .6 0 4 .5 0 0 .1 9 3 0 .2 4 4 0 .1 7 0 0 .7 0 0 .0 7 6 8° 0 .0 2 NOM 0 .0 4 3 0 .0 0 4 0 .0 3 9 0 .0 1 0 0 .0 0 5 0 .1 9 9 8 0 .2 5 2 0 .1 7 3 0 .0 2 6 0 .0 2 4 0° 4° 0 .0 0 8 – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. IN C H E S M AX 0 .0 4 7 0 .0 0 6 0 .0 4 1 0 .0 1 1 0 .2 0 0 0 .2 6 0 0 .1 7 7 0 .0 2 8 0 .0 0 3 8° V 0.1