MIC26901 _ BDTIC a Leading Distributor in China

MIC26901

The Micrel MIC26901 is a constant-frequency, synchronous buck regulator featuring a unique adaptive on-time control architecture. The MIC26901 operates over an input supply range of 4.5V to 28V and provides a regulated output of up to 9A of output current. The output voltage is adjustable down to 0.8V with a guaranteed accuracy of ±1%, and the device operates at a switching frequency of 600kHz. Hyper Speed Control™ architecture allows for ultra-fast transient response while reducing the output capacitance and also makes (High V_IN)/(Low V_OUT) operation possible. This adaptive t_ON ripple control architecture combines the advantages of fixed-frequency operation and fast transient response in a single device. The MIC26901 offers a full suite of protection features to ensure protection of the IC during fault conditions. These include under voltage lockout to ensure proper operation under power-sag conditions, internal soft-start to reduce inrush current, foldback current limit, "hiccup mode" short-circuit protection and thermal shutdown. An open-drain Power Good (PG) pin is provided.

Features

Hyper Speed Control™ architecture enables
High delta V operation (VIN = 28V and VOUT = 0.8V)
Small output capacitance
4.5V to 28V voltage input
9A output current capability, up to 95% efficiency
Adjustable output from 0.8V to 5.5V
±1% feedback accuracy
Any Capacitor™ stable -zero-to-high ESR
600kHz switching frequency
No external compensation
Power Good (PG) output
Foldback current-limit and "hiccup mode" short-circuit protection
Supports safe startup into a pre-biased load
-40°C to +125°C junction temperature range
28-pin 5mm x 6mm MLF® package

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

Documents

MIC26901 - 28V, 9A Hyper Speed Control? Synchronous DC/DC Buck Regulator	Data Sheets	11/05/2015	1042KB
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