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MAX17245ETESA+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX17245ETESA+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 17 page Detailed Description The MAX17245 is a 3.5A current-mode, step-down con- verter with integrated high-side and low-side MOSFETs designed to operate with an external Schottky diode for better efficiency. The low-side MOSFET enables fixed- frequency forced-PWM (FPWM) operation under light- load applications. The device operates with input voltages from 3.5V to 36V, while using only 28µA quiescent current at no load. The switching frequency is resistor programmable from 220kHz to 2.2MHz and can be synchronized to an external clock. The output voltage is available as 3.3V/5V fixed or adjustable from 1V to 10V. The wide input voltage range, along with its ability to operate at 98% duty cycle during undervoltage transients, make this device ideal for many applications. Under light-load applications, the FSYNC logic input allows the device to either operate in PFM mode for reduced current consumption or fixed-frequency PWM mode to eliminate frequency variation to minimize EMI. Fixed-frequency PWM mode is extremely useful for power supplies designed for RF transceivers where tight emission control is necessary. Protection features include cycle-by- cycle current limit, overvoltage protection, and thermal shutdown with automatic recovery. Additional features include a power-good monitor to ease power-supply sequencing and a 180° out-of-phase clock output relative to the internal oscillator at SYNCOUT to create cascaded power supplies with multiple devices. Wide Input Voltage Range The device includes two separate supply inputs (SUP and SUPSW) specified for a wide 3.5V to 36V input voltage range. VSUP provides power to the device and VSUPSW provides power to the internal switch. When the device is operating with a 3.5V input supply, conditions such as cold crank can cause the voltage at SUP and SUPSW to drop below the programmed output voltage. Under such conditions, the device operate in a high duty-cycle mode to facilitate minimum dropout from input to output. In applications where the input voltage exceeds 25V, output is ≤ 5V, operating frequency is ≥ 1.8MHz and the IC is selected to be in PWM mode by either forcing the FSYNC pin high, or using an external clock, pulse skipping is observed on the LX pin. This happens due to insufficient minimum on time. Add optional RSNUB = 1Ω and CSNUB = 220pF to reduce ringing on the LX pin (see the Typical Application Circuit). Linear Regulator Output (BIAS) The MAX17245 includes a 5V linear regulator (BIAS) that provides power to the internal circuit blocks. Connect a 1µF ceramic capacitor from BIAS to AGND. PIN NAME FUNCTION TQFN TSSOP 9 10 EN SUP Voltage Compatible Enable Input. Drive EN low to PGND to disable the device. Drive EN high to enable the device. 10 11 SUP Voltage Supply Input. SUP powers up the internal linear regulator. Bypass SUP to PGND with a 4.7µF ceramic capacitor. It is recommended to add a placeholder for an RC filter to reduce noise on the internal logic supply (see the Typical Application Circuit). 11 12 SUPSW Internal High-Side Switch Supply Input. SUPSW provides power to the internal switch. Bypass SUPSW to PGND with 0.1µF and 4.7µF ceramic capacitors. 12, 13 13, 14 LX Inductor Switching Node. Connect a Schottky diode between LX and PGND. 14 15 PGND Power Ground 15 16 PGOOD Open-Drain, Active-Low Power-Good Output. PGOOD asserts when VOUT is above 95% regulation point. PGOOD goes low when VOUT is below 92% regulation point. — — EP Exposed Pad. Connect EP to a large-area contiguous copper ground plane for effective power dissipation. Do not use as the only IC ground connection. EP must be connected to PGND. Pin Descriptions (continued) www.maximintegrated.com Maxim Integrated │ 9 MAX17245 3.5V–36V, 3.5A, Synchronous Buck Converter With 28μA Quiescent Current and Reduced EMI |
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