Micrel MIC23030 Manual

8mhz pwm 400ma buck regulator with hyperlight load

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General Description

The MIC23030 is a 400mA 8MHz switching regulator
featuring HyperLight Load™ mode. The MIC23030 is
highly efficient throughout the entire output current range,
drawing just 21µA of quiescent current in operation. The
®
tiny 1.6 x 1.6mm MLF
8MHz switching frequency, enables a compact sub-1mm
height solution with only three external components. The
MIC23030 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
MIC23030 automatically selects between two modes of
operation for optimum efficiency. Under light load
conditions, the MIC23030 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 loads, thereby
increasing operating efficiency. The MIC23030 attains up
to 83% 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 91% efficiency at higher loads. The two modes of
operation ensure the highest efficiency across the entire
load range.
The MIC23030 operates from an input voltage range of
2.7V to 5.5V and features internal power MOSFETs that
deliver up to 400mA 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 MIC23030 is available in fixed or adjustable versions
supporting an output voltage as low as 0.7V.

Requirements

The MIC23030 evaluation board requires an input power
source that is able to deliver greater than 500mA at 2.7V
to the MIC23030. 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.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
August 2008
package, in combination with the
MIC23030 Evaluation Board
8MHz PWM 400mA Buck Regulator
with HyperLight Load™

Getting Started

1. Connect an external supply to the V
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
(J1) terminal. Be sure to monitor the supply
IN
voltage at the V
and/or power lead resistance can reduce the
voltage supplied to the device.
2. Connect a load to the V
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
(J3) terminal.
OUT
3. Enable the MIC23030. The MIC23030 evaluation
board has a pull-up resistor to V
device, apply a voltage below 0.5V to the EN (J5)
terminal or place a jumper on JP1 to ground the
enable. 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 indeterminable state.
Output Voltage
The MIC23030 evaluation board is available with the
following output voltage options listed below:

Ordering Information

Part Number
MIC23030-AYMT EV
Adjustable Output Evaluation Board
MIC23030-CYMT EV
1.0V Fixed Output Evaluation Board
MIC23030-4YMT EV
1.2V Fixed Output Evaluation Board
MIC23030-FYMT EV
1.5V Fixed Output Evaluation Board
MIC23030-GYMT EV
1.8V Fixed Output Evaluation Board
Note: Other voltage options available on request
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
≤ 5.5V). An ammeter
IN
(J1) terminal, since the ammeter
IN
(J3) and ground
OUT
. To disable the
IN
Description
M9999-072208-A
(J1)
IN
IN

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Summary of Contents for Micrel MIC23030

  • Page 1: General Description

    HyperLight Load is a trademark of Micrel, Inc. MLF is a registered trademark of Amkor Technology. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( ) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com...
  • Page 2 1.8V application, the For optimum transient response performance, R2 should MIC23030 will transition into PWM mode at a load of be in the range of 180k Ω to 220k Ω . approximately 30mA. If under the same condition a 0.47µH inductor is chosen, the MIC23030 will transition into PWM mode at approximately 120mA.
  • Page 3: Bill Of Materials

    Micrel, Inc. MIC23030 Evaluation Board MIC23030 Typical Application Circuit (Fixed) Bill of Materials Item Part Number Manufacturer Description Qty. C1, C2 C1608X5R0J475K 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 CRCW06031003FT1 Vishay 100kΩ, 1%, Size 0603 LQM21PNR47M00 Murata 0.47µH, 0.9A, 90mΩ, L2mm x W1.25mm x H0.5mm...
  • Page 4 Micrel, Inc. MIC23030 Evaluation Board MIC23030 Typical Application Circuit (Adjustable 1.8V) Bill of Materials Item Part Number Manufacturer Description Qty. C1, C2 C1608X5R0J475K 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 OPEN CRCW06033833FT1 Vishay 383kΩ, 1%, Size 0603 CRCW06032003FT1 Vishay 200kΩ, 1%, Size 0603...
  • Page 5 Micrel, Inc. MIC23030 Evaluation Board PCB Layout Recommendations Fixed Top Layer Fixed Bottom Layer Adjustable Top Layer Adjustable Bottom Layer August 2008 M9999-072208-A...
  • Page 6 (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support aplpiances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.

This manual is also suitable for:

Mic23030-aymt evMic23030-cymt evMic23030-4ymt evMic23030-fymt evMic23030-gymt ev

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