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Document overview
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Technical content
Features
Input voltage: 2.5V ~5.5V High efficiency (95%) No Schottky Diode Required 1A Output Current at 5V Input 3.3V Output 1.5MHz Switching Frequency Built-in ON/OFF Function Low Dropout Operation: 100% Duty Cycle Thermal Protection Tiny 6-Lead TDFN2X2 Package RoHS Compliant
Applications
Mobile Phones Wireless and DSL modems Power Supply for Portable Devices General Description The AT1691 provides complete control for a DC/DC converter optimized for high-performance microproc- essor applications. It is operated on current mode ar- chitecture for excellent line and load transient re- sponse. 1.5MHz operation frequency is allowing the use of small surface mount inductor and capacitor. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The AT1691 is a family of low-noise synchronous step-down DC/DC converters that is ideally suited for systems powered from a 1-cell Li-ion battery or from a 3-cell to 4-cell NiCd, NiMH, or alkaline battery. It can also be used to USB-Based power system.
Ordering Information
VOLTAGE (V) TEMP. RANGE PACKAGE (Green) AT1691RB1U A161 Adjustable -40 °C~ +85°C TDFN2X2-6 Note: RB: TDFN2X2-6 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit TDFN2X2-6 AT1691 EN NC GND FB VIN LX FB GND AT1691CIN 4.7µF VIN 2.2µH COUT 10µF VOUT 3.3V/1A VOUT = 0.6V × (1+ )R1 Thermal Pad VIN LX EN (optional) CFB R2* *R2= 150K for stability consideration. Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TDFN2X2-6 AT1691 EN NC GND FB VIN LX FB GND AT1691CIN 4.7µF VIN 2.2µH COUT 10µF VOUT 3.3V/1A VOUT = 0.6V × (1+ )R1 Thermal Pad VIN LX EN (optional) CFB R2* *R2= 150K for stability consideration. Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.