LTC3419IDD#PBF

LTC3419IDD#PBF is a dual, 2.25MHz, constant-frequency, synchronous step-down DC/DC converter. Its 100% duty cycle provides low dropout operation, extending battery life in portable systems. Low output voltages are supported with the 0.6V feedback reference voltage. Each regulator can supply 600mA output current. It supplies an input voltage range of 2.5V to 5.5V, making it ideal for Li-Ion and USB-powered applications. Supply current during operation is only 35μA and drops to <1μA in shutdown. A user-selectable mode input allows the user to trade off between high-efficiency Burst Mode operation and pulse-skipping mode. An internally set 2.25MHz switching frequency allows the use of tiny surface-mount inductors and capacitors. Internal soft-start reduces inrush current during start-up. Applications include cellular telephones, digital still cameras, wireless and DSL modems, portable media players, and PDAs/palmtop PCs.

• High efficiency dual step-down outputs up to 96%, short-circuit protected
• User-Selectable Burst Mode® operation, 2.5V to 5.5V input voltage range
• Current mode operation for excellent line and load transient response
• Independent internal soft-start for each channel, no Schottky diodes required
• Internally compensated for all ceramic capacitors, 600mA current per channel at VIN = 3V
• Low dropout operation: 100% duty cycle. 2.25MHz typ oscillator frequency at (VFB = VFBREG)
• Switch leakage current is 1μA maximum at (VIN = 5V, VRUN = 0V, TA = 25°C)
• Output ripple in burst mode operation is 20mVP-P typical at (VOUT = 1.5V, COUT = 10μF)
• Operating junction temperature range from -40°C to 125°C
• 8-lead plastic DFN package

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party