Datasheet AS1310 Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter 1 General Description 2 Key Features Input voltage range: 0.7V to 3.6V The AS1310 is an ultra low IQ hysteretic step-up DC-DC converter optimized for light loads (60mA), where it achieves efficiencies of up Fixed output voltage range: 1.8V to 3.3V to 92%. Output current: 60mA VIN=0.9V, VOUT=1.8V AS1310 operates from a 0.7V to 3.6V supply and supports output Quiescent current: 1A (typ.) voltages between 1.8V and 3.3V. Besides the available AS1310 standard variants any variant with output voltages in 50mV steps are Shutdown current: < 100nA available. See Ordering Information on page 18 for more information. Up to 92% efficiency If the input voltage exceeds the output voltage the device is in a Output disconnect in shutdown feed-through mode and the input is directly connected to the output voltage. Feedthrough mode when VIN > VOUT In light load operation, the device enters a sleep mode when most of Adjustable low battery detection the internal operating blocks are turned off in order to save power. No external diode or transistor required This mode is active approximately 50s after a current pulse provided that the output is in regulation. Over temperature protection In order to save power the AS1310 features a shutdown mode, TDFN (2x2) 8-pin package where it draws less than 100nA. During shutdown mode the battery is disconnected from the output. 3 Applications The AS1310 also offers adjustable low battery detection. If the battery voltage decreases below the threshold defined by two The AS1310 is an ideal solution for single and dual cell powered external resistors on pin LBI, the LBO output is pulled to logic low. devices as blood glucose meters, remote controls, hearing aids, wireless mouse or any light-load application. The AS1310 is available in a TDFN (2x2) 8-pin package. Figure 1. AS1310 Typical Application Diagram L1 6.8H 3 LX VIN 0.7V to 3.6V Low Battery Detect 8 6 VIN LBO R3 C1 R1 22F 4 VOUT 1 1.8V to 3.3V AS1310 LBI VOUT C2 R2 22F 5 On 7 Off REF EN CREF 100nF GND 2 www.austriamicrosystems.com/DC-DC Step-Up/AS1310 Revision 1.7 1 - 19AS1310 Datasheet - Pin Assignments 4 Pin Assignments Figure 2. Pin Assignments (Top View) LBI 1 8 VIN GND 2 7 EN AS1310 3 6 LX LBO 4 5 VOUT Exposed pad REF 4.1 Pin Descriptions Table 1. Pin Descriptions Pin Number Pin Name Description Low Battery Comparator Input. 0.6V Threshold. May not be left floating. If connected to GND, LBO is 1LBI working as Power Output OK. Ground 2GND External Inductor Connector. 3LX Output Voltage. Decouple VOUT with a ceramic capacitor as close as possible to VOUT and GND. 4VOUT Reference Pin. Connect a 100nF ceramic capacitor to this pin. 5REF Low Battery Comparator Output. Open-drain output. 6LBO Enable Pin. Logic controlled shutdown input. 7EN 1 = Normal operation 0 = Shutdown shutdown current <100nA. Battery Voltage Input. Decouple VIN with a 22F ceramic capacitor as close as possible to VIN and 8VIN GND. Exposed Pad. This pad is not connected internally. Can be left floating or connect to GND to achieve an 9NC optimal thermal performance. www.austriamicrosystems.com/DC-DC Step-Up/AS1310 Revision 1.7 2 - 19