Datasheet

ManualsBrandsMicrochip ManualsIntegrated Circuits (ICs)LDO Voltage Regulator, ... 3.3VDC, SOT-23-5

MIC5235

Ultra-Low Quiescent Current, 150mA

µCap LDO Regulator

General Description

The MIC5235 is a 150mA highly accurate, low dropout

regulator with high input voltage and ultra-low ground

current. This combination of high voltage and low ground

current makes the MIC5235 ideal for USB and portable

electronics applications, using 1-cell, 2-cell or 3-cell Li-Ion

battery inputs.

A µCap LDO design, the MIC5235 is stable with either

ceramic or tantalum output capacitor. It only requires a

2.2µF capacitor for stability.

Features of the MIC5235 includes enable input, thermal

shutdown, current limit, reverse battery protection, and

reverse leakage protection.

Available in fixed and adjustable output voltage versions,

the MIC5235 is offered in the IttyBitty

SOT-23-5 package

with a junction temperature range of –40°C to +125°C.

Features

• Wide input voltage range: 2.3V to 24V

• Ultra low ground current: 18µA

• Low dropout voltage: 310mV at 150mA

• High output accuracy: ±2.0% over temperature

• µCap: stable with ceramic or tantalum capacitors

• Excellent line and load regulation specifications

• Zero shutdown current

• Reverse battery protection

• Reverse leakage protection

• Thermal shutdown and current limit protection

• IttyBitty

SOT-23-5 package

• Adjustable output from 1.24V-20V

Applications

• USB power supply

• Cellular phones

• Keep-alive supply in notebook and portable computers

• Logic supply for high-voltage batteries

• Automotive electronics

• Battery powered systems

Typical Application

OUT

=2.2µF

ceramic

GND

=18µA

=1.0µF

MIC5235BM5

OUT

=1.8V

49 14 19 24

GROUND CURRENT (µA)

INPUT VOLTAGE (V)

OUT

=10µA

OUT

= 1mA

OUT

= 100µA

Ultra-Low Current Adjustable Regulator Application

Ground Current vs. Input Voltage

IttyBitty is a registered trademark of Micrel, 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

May 2008

M9999-051508

Summary of content (9 pages)

PAGE 1
MIC5235 Ultra-Low Quiescent Current, 150mA µCap LDO Regulator General Description Features The MIC5235 is a 150mA highly accurate, low dropout regulator with high input voltage and ultra-low ground current. This combination of high voltage and low ground current makes the MIC5235 ideal for USB and portable electronics applications, using 1-cell, 2-cell or 3-cell Li-Ion battery inputs. A µCap LDO design, the MIC5235 is stable with either ceramic or tantalum output capacitor. It only requires a 2.
PAGE 2
Micrel, Inc. MIC5235 Ordering Information Part Number Marking Codes Junction Temp. Range Package Standard Pb-Free Standard Pb-Free* Voltage** MIC5235-1.5BM5 MIC5235-1.5YM5 L215 L215 1.5V –40° to +125°C 5-Pin SOT-23 MIC5235-1.8BM5 MIC5235-1.8YM5 L218 L218 1.8V –40° to +125°C 5-Pin SOT-23 MIC5235-2.5BM5 MIC5235-2.5YM5 L225 L225 2.5V –40° to +125°C 5-Pin SOT-23 MIC5235-2.7BM5 MIC5235-2.7YM5 L227 L227 2.7V –40° to +125°C 5-Pin SOT-23 MIC5235-3.0BM5 MIC5235-3.
PAGE 3
Micrel, Inc. MIC5235 Absolute Maximum Ratings(1) Operating Ratings(2) Input Supply Voltage ........................................ –20V to 38V Enable Input Voltage....................................... –0.3V to 38V Power Dissipation .....................................Internally Limited Junction Temperature ...............................–40°C to +125°C Storage Temperature ................................–65°C to +150°C ESD Rating(3) Input Supply Voltage ......................................... 2.
PAGE 4
Micrel, Inc. MIC5235 Typical Characteristics 70 350 60 DROPOUT VOLTAGE (mV) ILOAD = 150mA 40 30 20 10 100 50 ILOAD = 150mA 1 0.5 2000 1500 1000 500 0 02 GROUND CURRENT (µA) ILOAD = 10mA 70 65 60 55 50 45 -40 -20 02 04 06 08 0 100 120 700 680 580 560 540 520 500 -40 -20 02 GROUND CURRENT (µA) GROUND CURRENT (µA) 80 70 60 IOUT = 100µA 30 May 2008 04 06 08 0 100 120 TEMPERATURE (°C) IOUT = 10mA IOUT = 10µA 2 2.5 3 3.5 INPUT VOLTAGE (V) ILOAD = 75mA 4 2.4 2.2 2 1.
PAGE 5
Micrel, Inc. MIC5235 Typical Characteristics (continued) 100 80 60 40 20 0 -20 VEN = 5V RLOAD = 30 -10 0 SUPPLY VOLTAGE (V) 10 3.04 3.03 Output Voltage vs. Temperature SHORT CIRCUIT CURRENT (mA) 3.05 OUTPUT VOLTAGE (V) INPUT CURRENT (mA) 120 Input Current vs. Supply Voltage ILOAD = 100 µA 3.02 3.01 3 2.99 2.98 2.97 2.96 2.95 -40 -20 02 04 06 08 0 100 120 TEMPERATURE (°C) 400 Short Circuit Current vs.
PAGE 6
Micrel, Inc. MIC5235 Functional Diagram OUT IN EN ENABLE 1.24V VREF GND Block Diagram – Fixed Output Voltage OUT IN EN ENABLE R1 1.
PAGE 7
Micrel, Inc. MIC5235 Application Information ⎛ TJ(MAX) − TA PD(MAX) = ⎜⎜ θ JA ⎝ Enable/Shutdown The MIC5235 comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a “zero” off-mode-current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage.
PAGE 8
Micrel, Inc. MIC5235 Where VREF = 1.24V. Feedback resistor R2 should be no larger than 300kΩ. 319mW = (VIN – 3V)20mA + VIN x 0.2mA 379mW = VIN x 20.2mA VIN = 18.8V Maximum input voltage for a 20mA load current at 50°C ambient temperature is 18.8V, utilizing virtually the entire operating voltage range of the device. VIN VOUT May 2008 IN OUT EN ADJ. VOUT R1 1.0µF Adjustable Regulator Application The MIC5235BM5 can be adjusted from 1.24V to 20V by using two external resistors (Figure 1).
PAGE 9
Micrel, Inc. MIC5235 Package Information SOT-23-5 (M5) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.