Microchip MIC23153-GYMT Manual

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Side 1/6

MIC23153 Evaluation Board

4MHz PWM 2A Buck Regulator with

HyperLight Load™ and Power Good

HyperLight Load is a trademark of Micrel, Inc.

MLF and MicroLeadFrame are registered trademark Amkor Technology Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

February 2010 M9999-020510-A

General Description

This board enables the evaluation of the MIC23153, a

fully integrated 2A, 4MHz switching regulator featuring

HyperLight Load™ mode, Power Good output indicator,

and programmable soft-start. The MIC23153 is highly

efficient throughout the entire output current range,

drawing just 23µA of quiescent current in operation. The

tiny 2.5mm x 2.5mm Thin MLF® package, in combination

with the 4MHz switching frequency, enables a compact

sub-1mm height solution with only four external

components. The MIC23153 provides accurate output

voltage regulation under the most demanding conditions

and responds extremely quickly to a load transient with

exceptionally small output voltage ripple.

Requirements

This board needs a single 10W bench power source

adjustable from 2.7V to 5.5V. The loads can either be

active (electronic load) or passive (resistor) with the

capability to dissipate 7W. It is ideal to have an

oscilloscope available to view the circuit waveforms, but

not essential. For the simplest tests, two Voltage meters

are required to measure input and output voltage. For

efficiency measurements, two Voltage meters and two

Ammeters are required to prevent errors due to

measurement inaccuracies.

Precautions

There is no reverse input protection on this board. Be

cautious when connecting the input source to ensure

correct polarity is observed.

Getting Started

1. Connect an external supply to the VIN (J4)

terminal and GND (J3). With the output of the

power supply disabled, set its voltage to the

desired input test voltage (2.7V ≤ VIN ≤ 5.5V). An

ammeter may be placed between the input

supply and the VIN (J4) terminal. Be sure to

monitor the supply voltage at the VIN (J4)

terminal, as the ammeter and/or power lead

resistance can reduce the voltage supplied to

the device.

2. Connect a load to the VOUT (J1) and ground

(J2) terminals. The load can be either active

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 VOUT (J1) terminal.

3. Enable the MIC23153. The MIC23153

evaluation board has a pull-up resistor to V IN

. By

default, the output voltage will be enabled when

the input supply of >2.7V is applied. To disable

the device, apply a voltage below 0.5V to the EN

(J6) terminal.

4. Power Good. A Power good test point (J5) is

provided to monitor the Power Good function.

The Power Good output will go high (Vout)

approximately 70µs after the output voltage

reaches 92% of its nominal voltage.

Ordering Information

Part Number Description

MIC23153-GYMT 1.8V Fixed Output Evaluation Board

MIC23153YMT Adjustable Output Evaluation Board

Micrel, Inc. MIC23153 Evaluation Board

February 2010 2 M9999-020510-A

Evaluation Board

Other Features

Soft-Start Capacitor (C3)

The MIC23153 has a nominal 270kOhm resistor

charging the capacitor on the SS pin. This enables the

output to follow a controlled soft start characteristic.

Setting C3 to 100pF sets the startup time to the

minimum. The start-up time can be determined by:

TSS = 270 x 103 x ln(10) x CSS

The action of the soft-start capacitor is to control the rise

time of the internal reference voltage between 0% and

100% of its nominal steady state value.

Feedback Resistors (R1, R2) for Adjustable Output

The output voltage is set nominally to 1.8V. This output

can be changed by adjusting the upper resistor, R1, in

the feedback potential divider. Therefore:

R1 = R2 x VREF/(VO-VREF)

Where VREF = 0.62V

Some example values are:

VOUT R1 R2

1.2V 274k 294k

1.5V 316k 221k

1.8V 301k 158k

2.5V 324k 107k

3.3V 309k 71.5k

The Feed-forward capacitor, C4, is typically not fitted

since transient load regulation is already very good,

however, it can be improved slightly by fitting a capacitor

at C4 to inject fast output voltage deviations directly into

the feedback comparator. This improved load regulation

is at the expense of slightly increasing the amount of

noise on the output at higher loads. Values between

100pF and 1nF are recommended to prevent instability.

Power Good (PG)

The evaluation board has a test point provided to the

right of EN for testing PG. This is an open drain

connection with an on board pull-up resistor of 10k to the

output voltage. This is asserted high approximately 70μs

after the output voltage passes 92% of the nominal set

voltage.

HyperLight Load™ Mode

MIC23153 uses a minimum on and off time proprietary

control loop (patented by Micrel). When the output

voltage falls below the regulation threshold, the error

comparator begins a switching cycle that turns the

PMOS on and keeps it on for the duration of the

minimum-on-time. This increases the output voltage. If

the output voltage is over the regulation threshold, then

the error comparator turns the PMOS off for a minimum-

off-time until the output drops below the threshold. The

NMOS acts as an ideal rectifier that conducts when the

PMOS is off. Using a NMOS switch instead of a diode

allows for lower voltage drop across the switching device

when it is on. The asynchronous switching combination

between the PMOS and the NMOS allows the control

loop to work in discontinuous mode for light load

operations. In discontinuous mode, the MIC23153 works

in pulse frequency modulation (PFM) to regulate the

output. As the output current increases, the off-time

decreases, thus provides more energy to the output.

This switching scheme improves the efficiency of

MIC23153 during light load currents by only switching

when it is needed. As the load current increases, the

MIC23153 goes into continuous conduction mode (CCM)

and switches at a frequency centered at 4MHz. The

equation to calculate the load when the MIC23153 goes

into continuous conduction mode may be approximated

by the following formula:

⎟

⎠

⎞

⎜

⎝

⎛

×−

>f2L

D)V(V

IOUTIN

LOAD

As shown in the previous equation, the load at which

MIC23153 transitions from HyperLight Load™ mode to

PWM mode is a function of the input voltage (VIN), output

voltage (VOUT), duty cycle (D), inductance (L) and

frequency (f). As shown in the Switching Frequency vs

Load graph, as the Output Current increases, the

switching frequency also increases until the MIC23153

goes from HyperLight Load™ mode to PWM mode at

approximately 120mA. The MIC23153 will switch at a

relatively constant frequency around 4MHz once the

output current is over 120mA.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC23153-GYMT

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