General Description
The MIC23150 is a 2A 4MHz switching regulator featuring
HyperLight Load™ mode. The MIC23150 is highly efficient
throughout the entire output current range, drawing just
23µA of quiescent current in operation. The tiny 2mm x
2mm MLF
switching frequency, enables a compact sub-1mm height
solution with only three external components. The
MIC23150 provides accurate output voltage regulation
under the most demanding conditions and responds
extremely quickly to a load transient with exceptionally
small output voltage ripple.
Factoring in the output current, the internal circuitry of the
MIC23150 automatically selects between two modes of
operation for optimum efficiency. Under light load
conditions, the MIC23150 goes into HyperLight Load™
mode. HyperLight Load™ uses a Pulse-Frequency
Modulation (PFM) control scheme that controls the off time
at light load. This proprietary architecture reduces the
amount of switching needed at light load, thereby
increasing operating efficiency. The MIC23150 attains up
to 87% efficiency at 1mA output load. As the load current
increases beyond approximately 100mA, the device
operates using the Pulse-Width Modulation (PWM) method
for up to 93% efficiency at higher load. The two modes of
operation ensure the highest efficiency across the entire
load range.
The MIC23150 operates from an input voltage range of
2.7V to 5.5V and features internal power MOSFETs that
deliver up to 2A of output current. This step-down regulator
provides an output voltage accuracy of +/-2.5% across the
junction temperature range of -40ºC to +125ºC. The
MIC23150 is available in fixed output versions supporting
an output voltage as low as 1.0V.
Requirements
The MIC23150 evaluation board requires an input power
source that is able to deliver greater than 2A at 2.7V to the
MIC23150. The output load can either be an active
(electronic) or passive (resistive) load.
HyperLight Load is a trademark of Micrel, Inc. MLF is a registered trademark of Amkor Technology.
August 2009
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
®
package, in combination with the 4MHz
Getting Started
Output Voltage
The MIC23150 evaluation board is available with the
following output voltage options listed below:
Ordering Information
Note:
1. Contact Micrel Marketing
2. Other voltage options available on request. Contact Micrel.
408
MIC23150-CYMT EV
MIC23150-4YMT EV
MIC23150-GYMT EV
MIC23150-SYMT EV
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
1. Connect an external supply to the V
2. Connect a load to the V
3. Enable the MIC23150. The MIC23150 evaluation
MIC23150 Evaluation Board
Part Number
terminal. Apply the desired input voltage to V
(J1) and ground (J2) terminals of the evaluation
board, paying careful attention to polarity and
supply voltage (2.7V ≤ V
may be placed between the input supply and the
V
voltage at the V
and/or power lead resistance can reduce the
voltage supplied to the device.
terminal (J4). The load can be either passive
(resistive) or active (electronic load). An ammeter
may be placed between the load and the output
terminal. Ensure the output voltage is monitored at
the V
board has a pull-up resistor to V
device, apply a voltage below 0.5V to the EN (J5)
terminal. In the absence of the pull-up resistor, the
device is enabled by applying a voltage greater
than 1.2V to the EN (J5) terminal. The enable pin
must be either pulled high or low for proper
operation. Removing the pull-up resistor and
leaving the pin floating will cause the regulator to
operate in an unknown state.
4MHz 2A Buck Regulator with
IN
(J1) terminal. Be sure to monitor the supply
OUT
HyperLight Load™
(J3) terminal.
(1)
(1)
IN
1.0V Fixed Output Evaluation Board
1.2V Fixed Output Evaluation Board
1.8V Fixed Output Evaluation Board
3.3V Fixed Output Evaluation Board
(J1) terminal, since the ammeter
IN
Description
OUT
≤ 5.5V). An ammeter
(J3) and ground
IN
M9999-081709-A
. To disable the
(2)
IN
(J1)
IN