MIC26903 _ BDTIC a Leading Distributor in China

MIC26903

The Micrel MIC26903 is a constant-frequency, synchronous DC/DC buck regulator featuring adaptive on-time control architecture. The MIC26903 operates over a supply range of 4.5V to 28V. It has an internal linear regulator which provides a regulated 5V to power the internal control circuitry. MIC26903 operates at a constant 600kHz switching frequency in continuous conduction mode and can be used to provide up to 9A of output current. The output voltage is adjustable down to 0.8V. HyperLight Load^® architecture provides the same high-efficiency and ultra-fast transient response as the Hyper Speed Control™ architecture under medium to heavy loads, but also maintains high efficiency under light load conditions by transitioning to variable frequency, discontinuous mode operation. The MIC26903 offers a full suite of protection features to ensure protection of the IC during fault conditions. These include undervoltage lockout to ensure proper operation under power-sag conditions, thermal shutdown, internal soft-start to reduce the inrush current, foldback current limit and "hiccup" mode short-circuit protection. The MIC26903 includes a Power Good (PG) output to allow simple sequencing.

Features

HyperLight Load® efficiency - up to 80% at 10mA
Hyper Speed Control™ architecture enables
High delta V operation (VIN = 28V and VOUT = 0.8V)
Small output capacitance
Input voltage range: 4.5V to 28V
Output current up to 9A
Up to 95% efficiency
Adjustable output voltage from 0.8V to 5.5V
±1% FB accuracy
Any Capacitor™ stable - zero-to-high ESR
600kHz switching frequency
Power Good (PG) output
Foldback current-limit and "hiccup" mode short-circuit protection
Safe start-up into pre-biased loads
5mm x 6mm MLF® package
-40°C to +125°C junction temperature range

Parameter

Parameter Name Value	Value
Regulator Type Step Down (Buck)	Step Down (Buck)
# of Outputs 1	1
Input Voltage Range Min (V) 4.5	4.5
Input Voltage Range Max (V) 28	28
Output Voltage Range Min (V) 0.8	0.8
Output Voltage Range Max (V) 5.5	5.5
Output Current (A) max 9	9
Quiescent Current (mA) typ 0.45	0.45
Switching Frequency (kHz) 600	600
Synchronous Rectifier Yes	Yes
Operating Temp Range -40 to 125	-40 to 125
Vfb (V) 0.8	0.8
Duty Cycle Max (%) 0.82	0.82
SHUTDOWN Current (µA) (Typ) 5	5
Light Load Efficiency Mode Yes	Yes

Documents

MIC26903 - 28V, 9A Hyper Light Load? Synchronous DC/DC Buck Regulator	Data Sheets	11/05/2015	848KB
Micrel AN 39 - How to Power GSM/GPRS/EDGE/3G/HSPA M2M Modems	AppNote	10/01/2015	1403KB
Micrel ANLPS300 - How to Power GSM/GPRS/EDGE/3G/HSPA M2M Modems	AppNote	11/16/2015	1403KB