MIC2145BMM Datasheet MIC2145YMM-TR, MIC2145YMM, MIC2145YML-TR | P1-P3

April 2005 1 M9999-042205

MIC2145 Micrel, Inc.

MIC2145

High Efficiency 2.5W Boost Converter

General Description

The MIC2145 is a small size boost switching regulator that

can provide over 2.5W of output power. The input voltage

range is between 2.4V to 16V, making the device suitable for

one-cell Li-Ion and 3- to 4-cell alkaline/NiCad/NiMH applica-

tions. The output voltage of the MIC2145 can be adjusted up

to 16V.

The MIC2145 is well suited for portable, space-sensitive

applications. Its typical 450kHz operation allows small sur-

face mount external components to be used. The MIC2145

has a low quiescent current of 200µA, and a typical shutdown

current of 0.5µA. The MIC2145 is capable of high efficiencies

in a small board area.

The MIC2145 features a low-on resistance internal switch

that allows it to provide over 2.5W of output power. The peak

switch current can be programmed through an external

resistor. This allows the user to set the peak switch current at

the level where maximum efficiency occurs. It also allows the

user to further optimize for efficiency and inductor size by

setting the peak current below the level of inductor saturation.

The MIC2145 is available in an MSOP-8 and 3mm×3mm

MLF™-10L package with an ambient operating temperature

range from –40°C to +85°C.

Typical Application

10µH

MIC2145BMM

RSET

PGND

EN SW

OUT

10V/150mA

VDD

SGND

I Limit

3.0V to 5.0V

10µF/6.3V

OUT

10µF/16V

10 100 1000

EFFICIENCY (%)

OUTPUT CURRENT (mA)

10V Output

Efficienc

= 3.0V

Adjustable Output Boost Converter with Programmable Peak Switch Current

Features

•2.4V to 16V input voltage

• Output adjustable to 16V

•Programmable peak current limit

• Soft start

• Up to 450kHz switching frequency

•0.5µA shutdown current

• 200µA quiescent current

• Capable of 5V/ 500mA output with 3.3V input

• Achieves over 85% efficiency

•Implements low power BOOST, SEPIC, and FLYBACK

topologies

• MSOP-8 and 3mm×3mm MLF™-10L

Applications

•Flash LED driver

• LCD bias supply

• White LED driver

• DSL bias supply

• Local 3V to 5V conversion

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

Ordering Information

Part Number Voltage Ambient

Standard Pb-Free Temp. Range Package

MIC2145BMM MIC2145YMM Adj –40°C to +85°C 8-lead MSOP

MIC2145BML MIC2145YML Adj –40°C to +85°C 10-lead MLF™

MLF and MicroLeadFrame are trademarks of Amkor Technologies, Inc.

MIC2145 Micrel, Inc.

M9999-042205 2 April 2005

Pin Description

Pin Number Pin Number Pin Name Pin Function

MSOP MLF

11 EN Enable (Input): Logic high (≥1.5V) enables regulator. Logic low (≤0.7V)

shuts down regulator. Do not float.

22 SS Soft Start Capacitor (External Component): Connect external capacitor to

ground to control the rise time of the output voltage.

33 RSET Current Limit (External Component): Sets peak current limit of the internal

power MOSFET using an external resistor.

4 4, 5 PGND Power Ground (Return): Internal power MOSFET source.

5 6, 7 SW Switch Node (Input): Internal power MOSFET drain.

68 VDD Supply (Input): +2.4V to +16V for internal circuitry.

79 FB Feedback (Input): Output voltage sense node.

810SGND Small Signal Ground (Return): Ground

Pin Configuration

1EN

RSET

PGND

8 SGND

VDD

8-Lead MSOP (MM)

RSET

PGND

SGND

VDD

PGND SW

3mm

××

×3mm MLF-10L (ML)

April 2005 3 M9999-042205

MIC2145 Micrel, Inc.

Electrical Characteristics (Note 6)

= 10V, V

OUT

= 10V, I

OUT

= 100mA; T

=25°C, unless otherwise noted, bold values indicate –40°C ≤ T

≤ 125°C.

Parameter Condition Min Typ Max Units

Supply Voltage 2.4 16 V

Shutdown Current EN = 0.3V, V

= 10V, V

=1.35V 0.5 5 µA

Quiescent Current EN = V

, V

= 10V, V

= 1.35V 200 300 µA

Feedback Voltage Reference (±2%) 1.058 1.08 1.102 V

(±3%) 1.048 1.112 V

Comparator Hysteresis 18 mV

Feedback Input Current V

=1.35V 40 nA

Peak Current Limit R

SET

=200Ω, V

= 3.6V, Note 4 0.8 A

SET

=1kΩ, V

= 10V, Note 4 0.9 A

Current Limit Comparator 500 ns

Propagation Delay

Switch On-Resistance I

= 150mA, V

= 3.0V 500 750 mΩ

= 1.2A, V

= 10V 250 400 mΩ

Maximum Off Time 1000 ns

Enable Input Voltage Logic Low (turn-off) 1.1 0.7 V

Logic High (turn-on) 1.5 1.1 V

Enable Input Current V

= 0V –1 0.01 1 µA

= 2V –1 0.01 1 µA

Soft Start Current V

= 2V, V

=3.0V –8 –12 –16 µA

Note 1. Exceeding the absolute maximum rating may damage the device.

Note 2. The device is not guaranteed to function outside its operating rating.

Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5KΩ in series with 100pF.

Note 4. The current is measured in a DC mode. Actual peak switching current will be higher due to internal propagation delay of the circuit.

Note 5. V

≤ V

Note 6. Specification for packaged product only.

Absolute Maximum Ratings (Note 1)

Supply Voltage (V

) .................................................... 18V

Switch Voltage (V

) .................................................... 18V

Feedback Voltage (V

) ................................................ 18V

Switch Current (I

) ........................................................ 2A

Enable Voltage(V

), Note 5 ........................................ 18V

RSET Voltage (V

RSET

) .................................................... 6V

ESD Rating, Note 3 ...................................................... 2kV

Ambient Storage Temperature(T

) .......... –65°C to +150°C

Operating Ratings (Note 2)

Supply Voltage (V

) ....................................... 2.4V to 16V

Switch Voltage (V

) .................................................... 16V

Ambient Temperature (T

) ......................... –40°C to +85°C

Junction Temperature (T

) ....................... –40°C to +125°C

Package Thermal Resistance MSOP

(MSOP-8) .................................................... 206°C/W

(3mm×3mm MLF-10) .................................... 60°C/W

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15

MIC2145BMM

Mfr. #:

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MIC2145BMM

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