PDF AAT1108 Data sheet ( Hoja de datos )

Número de pieza	AAT1108
Descripción	2-CHANNEL STEP-UP PWM CONTROLLERS
Fabricantes	Advanced Analog Technology
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No Preview Available ! Advanced Analog Technology, Inc. Preliminary and Provisional AAT1108 2-CHANNEL STEP-UP PWM CONTROLLERS WITH ADJUSTABLE LDO www.DataShFeeeat4tUu.croems 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 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) General Description 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. *Spec is subject to change without notice in this document. –– Advanced Analog Technology, Inc. V 0.1 1 page Advanced Analog Technology, Inc. AAT1108 Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Reference Voltage Parameter Internal reference Voltage Reference voltage Test Conditions Min Typ Max Unit Vrefi IREF = −1mA , TA = 25 oC 1.220 1.233 1.246 VREF IREF = −1mA , TA = 25 oC 2.430 2.505 2.580 V www.DataSheet4U.com Input voltage regulation Output regulation VRI IREF = −1mA , VDD = 4.0V to 6.0V VRO IREF = −0.1mA to -1mA 1 5 mV 1 mV EA (Error Amplifier) Parameter Input offset voltage Input bias current Input voltage range Open-loop voltage amplification Output voltage swing VIO I IB VIR A VD VOM+ Output sink current Output source current VOM− I OM + I OM − Common-mode rejection ratio CMRR Test Condition Ch-1,2, AV=1 Ch-1,2 Ch-1,2 FB=1.25V FB=1.25V Min Typ Max Unit 6 mV ±15 ±100 nA 0.5 1.6 V 70 85 dB 2.3 2.5 V 0.7 0.9 3 20 mA -45 -75 µA 60 80 dB –– Advanced Analog Technology, Inc. V 0.1 5 Page Advanced Analog Technology, Inc. Package Dimension (Unit: Mil) AAT1108 www.DataSheet4U.com D IM E N S IO N S IN M IL L IM E T E R S M IN NOM M AX A A1 A2 b C D E E1 e L y 0° 4° 8° D IM E N S IO N S IN IN C H E S M IN NOM M AX 0° 4° 8° –– Advanced Analog Technology, Inc. V 0.1 11 Page

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