MIC68400-1.8YML MICREL [Micrel Semiconductor], MIC68400-1.8YML Datasheet

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MIC68400-1.8YML

Manufacturer Part Number
MIC68400-1.8YML
Description
4A Sequencing LDO with Tracking and Ramp Control
Manufacturer
MICREL [Micrel Semiconductor]
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MIC68400-1.8YML-TR
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
General Description
The MIC68400 is a 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 4A of
current for start-up, the MIC68400 provides high power
from a small MLF
also implement a variety of power-up and power-down
protocols such as sequencing, tracking, and ratiometric
tracking.
The MIC68400 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 MIC68400 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 and turn-off. 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.
Multiple MIC68400s can be daisy chained in two modes.
In tracking mode the output voltage of the Master drives
the RC pin of a Slave so that the Slave tracks the main
regulator during turn-on and turn-off. In sequencing mode
the POR of the Master drives the enable (EN) of the Slave
so that it turns on after the Master and turns off before (or
after) the Master. This behavior is critical for power-up and
power-down control in multi-output power supplies. The
MIC68400 is fully protected offering both thermal, current
limit protection, and reverse current protection.
The MIC68400 has a junction temperature range of
–40°C to +125°C and is available in fixed as well as an
adjustable option. The MIC68400 is offered in the tiny
16-pin 4mm x 4mm MLF
Ramp Control is a trademark of Micrel, Inc.
MLF and MicroLeadFrame is a registered trademark of Amkor Technology, Inc.
August 2009
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
®
leadless package. The MIC68400 can
®
package.
Features
Applications
408
4A Sequencing LDO with Tracking and
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Stable with 10µF ceramic capacitor
Input voltage range: 1.65V to 5.5V
0.5V reference
±2.0% output tolerance over temperature
4A maximum output current – peak start up
3A 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
during turn-on and turn-off
Power-on reset (POR) supervisor with programmable
delay time
Single master can control multiple slave regulators
with tracking output voltages
Tiny 4mm x 4mm MLF
Maximum dropout (V
temperature at 3A output current
Fixed and 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
Ramp Control™
MIC68400
IN
®
– V
package
OUT
) of 500mV over
M9999-081809-C

Related parts for MIC68400-1.8YML

MIC68400-1.8YML Summary of contents

Page 1

... The MIC68400 operates from a wide input range of 1.65V to 5.5V, which includes all of the main supply voltages commonly available today designed to drive digital circuits requiring low voltage at high currents (i.e. PLDs, DSP, microcontroller, etc ...

Page 2

... Micrel, Inc. Typical Application Sequenced Dual Power Supply for I/O and Core Voltage of µProcessor August 2009 2 MIC68400 M9999-081809-C ...

Page 3

... Micrel, Inc. Tracking Dual Power Supply for I/O and Core Voltage of µProcessor August 2009 3 MIC68400 M9999-081809-C ...

Page 4

... Output Error Low Voltage EN Sequencing Timer/Controller DLY Ordering Information Part Number Current MIC68400-1.8YML MIC68400YML NOTE: For additional voltage options, contact Micrel Marketing. ® MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. August 2009 Ramp External on ...

Page 5

... Output Voltage Sense Pin: Connect directly to output pin. Adjustable regulators: Feedback input. Connect to resistor voltage divider. Output Voltage: Output of voltage regulator. Place capacitor to ground to bypass the output voltage. Minimum load current is 100µA. Nominal bypass capacitor is 10µF. 5 ® 16-Pin 4mm × 4mm MLF (ML) Adjustable Voltages M9999-081809-C MIC68400 ...

Page 6

... V ≥ 1V (Regulator enable 5.5V; POR = High POR Output Logic-Low Voltage (undervoltage condition 1mA POR Threshold below nominal OUT Hysteresis V = 0.75V DELAY V = High POR 6 MIC68400 (2) ) ....................................... 1.65V to 5.5V IN )..................................... )............................................. ..............................................30°C/W JA ≤ +125°C, unless noted. J Min Typ Max -2 +2 0.50 0.49 0.51 20 ...

Page 7

... Measure (VOUT – TARGET ; 500mV)) RC TARGET (ambient temperature Min Typ Max 1 0.7 1 -50 25 100 RC - – θ . Exceeding the maximum D(max) J(max and Adj/Sns pin, or the rated output OUT M9999-081809-C MIC68400 Units µ ...

Page 8

... Micrel, Inc. Typical Characteristics August 2009 8 MIC68400 M9999-081809-C ...

Page 9

... Micrel, Inc. Functional Characteristics August 2009 9 MIC68400 M9999-081809-C ...

Page 10

... For simple applications the enable (EN) can be connected to V MIC68400 only requires a few µA’s of enable current to turn on, actual enable pin current will depend on the overdrive (enable voltage exceeding 1V) in each particular application. ...

Page 11

... Fixed Parts driven from another (Master) regulator the two outputs will track each other until the Master exceeds the target voltage of the Slave regulator. Typically the output of the MIC68400 will track above the RC input by 30mV to 70mV. This offset is designed to allow Master/Slave tracking of same-voltage regulators ...

Page 12

... RC pin for low values of output capacitor the maximum discharge current available at the output for large values of output capacitor. Turn off slew rate is not a specified characteristic of the MIC68400. Sequencing Configurations Sequencing refers to timing based Master/Slave control between regulators. It allows a Master device to control the start and stop timing of a single or multiple Slave devices ...

Page 13

... POR delay during turn-on. Fixed Voltage Devices August 2009 Fixed voltage versions of MIC68400 have two internal voltage dividers: one for setting the output voltage and the other for driving the tracking circuitry. Adjustable parts have up to two external dividers: one from ...

Page 14

... Also, when RC is driven in tracking mode, pulling EN low will not cause the output to drop. Maintaining low EN in tracking mode simply means that the MIC68400 will shutdown when the tracking voltage gets near zero case can the MIC68400 enter the tracking mode unless EN is pulled high. August 2009 ...

Page 15

... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully August 2009 16-Pin 4mm x 4mm MLF (ML) indemnify Micrel for any damages resulting from such use or sale. © 2007 Micrel, Incorporated. 15 MIC68400 for surgical implant M9999-081809-C ...

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