MIC24051 _ BDTIC a Leading Distributor in China

MIC24051

The Micrel MIC24051 is a constant-frequency, synchronous buck regulator featuring a unique adaptive on-time control architecture. The MIC24051 operates over an input supply range of 4.5V to 19V and provides a regulated output of up to 6A 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.

Micrelâ€™s 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 MIC24051 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, 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.

Also see the 6A HyperLight Load^® part, MIC24052.

Features

Hyper Speed Control™ architecture enables
High delta V operation (VIN = 19V and VOUT = 0.8V)
Small output capacitance
4.5V to 19V input voltage
Adjustable output from 0.8V to 5.5V (±1% accuracy)
Any Capacitor™ stable &em; Zero-to-high ESR
6A output current capability, up to 95% efficiency
600kHz switching frequency
No external compensation
Power Good (PG) output
Foldback current limit and "hiccup" mode short-circuit protection
Supports safe start-up into a pre-biased load
-40°C to +125°C junction temperature range
Available in 28-pin 5mm X 6mm QFN 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) 19	19
Output Voltage Range Min (V) 0.8	0.8
Output Voltage Range Max (V) 5.5	5.5
Output Current (A) max 6	6
Quiescent Current (mA) typ 0.73	0.73
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

MIC24051 - 12V, 6A High-Efficiency Buck Regulator	Data Sheets	11/09/2015	1283KB
Micrel AN 105 - Troubleshooting Switching Power Supplies	AppNote	10/02/2015	177KB
Micrel AN 39 - How to Power GSM/GPRS/EDGE/3G/HSPA M2M Modems	AppNote	10/01/2015	1403KB
Micrel AN 87 - Putting Adaptive Constant-ON-Time Buck ICs and Modules to Work in Inverting Buck-Boost Converters	AppNote	10/02/2015	509KB
Micrel ANLPS207 - Putting Adaptive Constant-On-Time Buck ICs and Modules to Work in Inverting Buck-Boost Converters	AppNote	11/16/2015	509KB
Micrel ANLPS300 - How to Power GSM/GPRS/EDGE/3G/HSPA M2M Modems	AppNote	11/16/2015	1403KB