LT1307B Datasheet

• Uses Small Ceramic Capacitors
• 1mA Quiescent Current (LT1307B)
• Operates with V_IN as Low as 1V
• 600kHz Fixed Frequency Operation
• Starts into Full Load
• Low Shutdown Current: 3µA
• Low-Battery Detector
• 3.3V at 75mA from a Single Cell
• Continuous Switching at Light Load (LT1307B)
• Low V_CESAT Switch: 295mV at 500mA

• Pagers
• Cordless Telephones
• GPS Receivers
• Battery Backup
• Portable Electronic Equipment
• Glucose Meters
• Diagnostic Medical Instrumentation

The LT1307B are micropower, fixed frequency DC/DC converters that operate from an input voltage as low as 1V. First in the industry to achieve true current mode PWM performance from a single cell supply. The LT1307B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency. The devices contain a low-battery detector with a 200mV reference and shut down to less than 5µA.

Unlike competitive devices, large electrolytic capacitors are not required with the LT1307B in single cell applications. The high frequency (600kHz) switching allows the use of tiny surface mount multilayer ceramic (MLC) capacitors along with small surface mount inductors. The devices work with just 10µF of output capacitance and require only 1µF of input bypassing.

The LT1307B are available in 8-lead MSOP, PDIP and SO packages.