MIC68220YML Micrel Semiconductor, MIC68220YML Datasheet

MIC68220YML

Manufacturer Part Number

MIC68220YML

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC68220YML.pdf (18 pages)

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General Description

The MIC68220 is a dual high peak current LDO regulator

designed specifically for powering applications such as

FPGA core voltages that require high start up current with

lower nominal operating current. Capable of sourcing 2A of

current per channel for start-up, the MIC68220 provides

high power from a small MLF™ leadless package. The

MIC68220 can also implement a variety of power-up and

power-down protocols such as sequencing, tracking, and

ratiometric tracking.

The MIC68220 operates from a wide input range of 1.65V

to 5.5V, which includes all of the main supply voltages

commonly available today. It is designed to drive digital

circuits requiring low voltage at high currents (i.e. PLDs,

DSP, microcontroller, etc.). The MIC68220 incorporates a

delay pin (Delay) for control of power on reset output

(POR) at turn-on and power-down delay at turn-off. In

addition there is a ramp control pin (RC) for either tracking

applications or output voltage slew rate adjustment at turn-

on. This is important in applications where the load is

highly capacitive and in-rush currents can cause supply

voltages to fail and microprocessors or other complex logic

chips to hang up.

The MIC68220’s can be configured in two modes.

tracking mode, the output voltage of Vout1 drives the RC2

pin so that the Vout2 tracks Vout1 during turn-on and turn-

off. In sequencing mode, POR1 of Vout1 drives the enable

pin (EN2) of Vout2 so that it turns on after the Vout1 and

turns off before (or after) Vout1. This behavior is critical

for power-up and power-down control in multi-output

power supplies. The MIC68220 is fully protected offering

both thermal and current limit protection, and reverse

current protection.

The MIC68220 has a junction temperature range of

-40°C to +125°C and is available in an adjustable Vout1 &

Vout2 version. The MIC68220 is offered in a low profile

4mm x 5mm 20ld MLF

___________________________________________________________________________________________________________

MLF and MicroLead Frame is a registered trademark of Amkor Technologies

December 2006

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

package.

Features

•

Applications

•

408

) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Stable with 4.7uF ceramic output capacitor

Input voltage range: 1.65V to 5.5V

0.5V reference

+1.0% initial output tolerance

2A maximum output current – peak start up

1A Continuous Operating Current

Tracking on turn-on and turn-off with pin strapping

Timing Controlled Sequencing On/Off

Programmable Ramp Control™ for in-rush current

limiting and slew rate control of the output voltage on

Turn-On

Power-on Reset (POR) supervisor with programmable

delay time

Single Master can control multiple Slave regulators

with tracking output voltages

Tiny 4mm x 5mm MLF

Maximum dropout (V

temperature at 1A output current

Adjustable Output Voltages

Excellent line and load regulation specifications

Logic controlled shutdown

Thermal shutdown and current limit protection

FPGA/PLD Power Supply

Networking/Telecom Equipment

Microprocessor Core Voltage

High Efficiency Linear Post Regulator

Sequenced or Tracked Power Supply

Dual 2A LDO Regulator

MIC68220

– V

package

OUT

) of 400mV over

(408) 944-0800

M9999-121406

Related parts for MIC68220YML

MIC68220YML Summary of contents

Page 1

General Description The MIC68220 is a dual high peak current LDO regulator designed specifically for powering applications such as FPGA core voltages that require high start up current with lower nominal operating current. Capable of sourcing 2A of current per ...

Page 2

Micrel Typical Application Sequenced Dual Power Supply for I/O and Core Voltage of µProcessor December 2006 2 MIC68220 M9999-121406 (408) 955-1690 ...

Page 3

Micrel Tracking Dual Power Supply for I/O and Core Voltage of µProcessor December 2006 3 MIC68220 M9999-121406 (408) 955-1690 ...

Page 4

Micrel Block Diagram December 2006 4 MIC68220 M9999-121406 (408) 955-1690 ...

Page 5

... Micrel Ordering Information Part Number Current MIC68220YML NOTE: For additional voltage options, contact Micrel Marketing. Pin Configuration December 2006 Output Voltage Temperature Range 2.0A ADJ –40°C to +125°C 5 Junction Package PB-Free 20-Pin 4x5 MLF® MIC68220 M9999-121406 (408) 955-1690 ...

Page 6

Micrel Pin Description (Pin Numbering may change depending on layout considerations) 1,2 VIN1 3 Delay1 4 RC1 5 EN1 6,7 VIN2 8 Delay2 9 RC2 10 EN2 11 GND 12 POR2 13 ADJ2 13 SNS2 14,15 VOUT2 16 GND 17 ...

Page 7

Micrel Absolute Maximum Ratings Supply Voltage (V ) .........................................................6V IN Enable Input Voltage (V )............................. POR (V )........................................................... V POR RC ....................................................................... V Power Dissipation .................................. Internally Limited Junction Temperature .........................–40°C ≤ T Storage Temperature (T ...

Page 8

Micrel Parameter Conditions Ramp Control I Ramp Control Current (Note 7) V DISCHARGE(OUTPUT) Tracking Accuracy: Fixed 200mV < V (Note 8) Tracking Accuracy: Adjustable Measure (VOUT - V (Note 8) Notes: 1. Exceeding the absolute maximum rating ...

Page 9

Micrel Typical Characteristics December 2006 9 MIC68220 M9999-121406 (408) 955-1690 ...

Page 10

Micrel Typical Characteristics December 2006 10 MIC68220 M9999-121406 (408) 955-1690 ...

Page 11

Micrel Functional Characteristics Enable Turn-On Time (10µs/div) December 2006 OUT + 1V V OUT = 1.8V C OUT = 4.7µF I OUT = 10mA C = 4.7µF LOAD Load Transient OUT + ...

Page 12

Micrel Applications Information Enable Input The MIC68220 features a TTL/CMOS compatible positive logic enable input for on/off control of the device. High (>1V) enables the regulator while low (<.2V) disables the regulator. In shutdown the regulator consumes very little current ...

Page 13

Micrel Adjustable Regulator Design Adjustable Regulator with Resistors The adjustable MIC68220 output voltage can be programmed from 0.5V to 5.5V using a resistor divider from output to the SNS pin. Resistors can be quite large 1MΩ because of ...

Page 14

Micrel Ramp Up: Cap Controlled Slew Rate If a capacitor is connected to RC, the bidirectional current source will charge the cap during startup and discharge the cap during shutdown. The size of the capacitor and the RC current (1µA ...

Page 15

Micrel Tracking Configurations Normal Tracking In normal tracking the Slave RC pin is driven from the Master output. Internal control buffering assures that the output of the Slave is always slightly above the Master to guarantee that the Slave properly ...

Page 16

Micrel Ratiometric Tracking Ratiometric tracking allows independent ramping speeds for both regulators so that the regulation voltage is reached at the same time. This is accomplished by adding a resistor divider between the Master output pin and the Slave RC ...

Page 17

Micrel Package Information 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, ...

Page 18

Micrel Revision History Date Revision 1.0 6/15/06 1.1 9/21/06 December 2006 Edits by: Description of Change Initial Spec M. Mclean Coversion of drawings Micrel Format M. Galinski Edits 18 MIC68220 M9999-121406 (408) 955-1690 ...

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