ML4851CS-3 MICRO-LINEAR [Micro Linear Corporation], ML4851CS-3 Datasheet
ML4851CS-3
Available stocks
Related parts for ML4851CS-3
ML4851CS-3 Summary of contents
Page 1
GENERAL DESCRIPTION The ML4851 is a low power boost regulator designed for conversion cell battery powered systems. The maximum switching frequency can exceed 100kHz, allowing the use of small, low cost inductors. The ...
Page 2
ML4851 PIN CONFIGURATION PIN DESCRIPTION PIN NAME FUNCTION 1 V Battery input voltage 200mV reference output REF 3 GND Analog signal ground 4 DETECT Pulling this pin below V RESET pin to go low 2 ML4851 8-Pin ...
Page 3
... RESET Output Low Voltage Note 1: Limits are guaranteed by 100% testing, sampling or correlation with worst case test conditions. OPERATING CONDITIONS Temperature Range ML4851CS-X .............................................. 0ºC to 70ºC ML4851ES-X ........................................... –20ºC to 70ºC V Operating Range IN ML4851CS-X ................................ 1. ML4851ES-X ................................ 1. 0.3V Thermal Resistance ( OUT 1A 250mA = Operating Temperature Range (Note 1) A ...
Page 4
ML4851 Figure 3. PFM Inductor Current Waveforms and Timing (Sumida CD75) IN 100 F ML4851 PWR GND IN RESET REF GND V L DETECT V OUT ...
Page 5
FUNCTIONAL DESCRIPTION The ML4851 combines Pulse Frequency Modulation (PFM) and synchronous rectification to create a boost converter that is both highly efficient and simple to use. A PFM regulator charges a single inductor for a fixed period of time and ...
Page 6
ML4851 250 ML4851-3 200 L = 10µH 150 100 50 0 1.0 1.5 2 (V) 95 ML4851 10µ 1.0 1 18µ 33µH ...
Page 7
DESIGN CONSIDERATIONS After the appropriate inductor value is chosen necessary to find the minimum inductor current rating required. Peak inductor current is determined from the following formula MAX ( ) IN MAX ( I L ...
Page 8
ML4851 DESIGN CONSIDERATIONS V IN MIN ( ) LAYOUT Good PC board layout practices will ensure the proper operation of the ML4851. Important layout considerations include: ...
Page 9
... PLACES) 0.055 - 0.061 (1.40 - 1.55) ORDERING INFORMATION PART NUMBER ML4851CS-3 ML4851CS-5 ML4851ES-3 ML4851ES-5 ML4851IS-3 (obsolete) ML4851IS-5 (obsolete) © Micro Linear 1997 registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners. Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; ...