MIC68400YML Evaluation Board User Guide

MIC68400 Evaluation Board
4A Sequencing LDO with Tracking
and Ramp Control™
General Description
Features
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 from start-up, the MIC68400
provides high power from a small MLF leadless
package. The MIC68400 can 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. 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. On board jumpers
allow selection of on board delay caps, tracking, or
sequencing mode.
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Stable with 10uF ceramic capacitor
Input voltage range: 1.65V to 5.5V
Adjustable output voltage down to 0.5V
4A maximum output current – peak start up
3A Continuous Operating Current
Tracking on turn-on and turn-off
Timing Controlled Sequencing
Programmable Ramp Control™
Power-on Reset (POR) supervisor with
programmable delay time
Tiny 4mm x 4mm MLFTM package
Terminal Description
PCB
Connections
Terminal
Name
J1
VIN
Input
J2
GND
Ground
J3
VOUT
Output
J4
GND
Ground
J5
POR
Power On Reset (Power Good Flag)
J6
EN
Terminal Function
Enable
MLF and MicroLeadFrame are trademarks of 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
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MIC68400
Schematic
Programming Jumpers
Jumper Number
Jumper Name
Jumper Function
JP1
POR1 Source
[1:2] – Use VIN1;
JP2
Delay1 Source
[1:2] – Use C3 (on board delay);
[2:3] – NC (min delay)
[2:3] – NC (min ramp slope)
[2:3] – Use VO1 (min Q Current)
JP3
RC1 Source
[1:2] – Use C4 (on board ramp slope);
JP4
ADJ Voltage
Select
[1:2] – 1.5V
[3:4] – 1.8V
[5:6] – 2.5V
No Jumper – 0.5V
[7:8] – 3.3V
Ordering Information
Part Number
Description
MIC68400YML EV
Evaluation board with MIC68400YML adjustable device.
NOTE: For additional voltage options, contact Micrel Marketing.
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MIC68400
Applications Information
Typical Jumper Connections (Using two MIC68400YML EV boards)
Enable
Input
VIN1 & VIN2
J1
JP1
JP2
JP3
JP4
JP5
JP6
JP7
JP8
J6
J6
Description
POR
1
DLY
1
RC
1
VO
1
POR
2
DLY
2
RC
2
VO
2
EN
1
EN
2
Delayed Sequencing:
U2 Master w/ VOUT = 2.5V
U1 Slave w/ VOUT = 1.8V
U2
J6
3.3V
1:2
1:2
2nF
2:3
3:4
1:2
1:2
2:3
5:6
U2
POR
EXT
Windowed Sequencing:
U1 Master w/ VOUT = 2.5V
U2 Slave w/ VOUT = 1.8V
U1
J6
3.3V
1:2
1:2
2nF
2:3
5:6
1:2
1:2
2:3
3:4
EXT
U1
POR
Normal Tracking:
U1 Master w/ VOUT = 2.5 V
U2 Slave w/ VOUT = 1.8V
U1, U2
J6
3.3V
1:2
1:2
1:2
5:6
1:2
2:3
U1
VO
(1)
3:4
EXT
EXT
Ratiometric Tracking:
U1 Master w/ VOUT = 2.5 V
U2 Slave w/ VOUT = 1.8V
U1, U2
J6
3.3V
1:2
1:2
1:2
3nF
5:6
1:2
2:3
U1
RC
3:4
EXT
EXT
Note:
1. Requires external resistor divider connected to output pin of unit 1.
December 2005
Delayed Sequencing
Windowed Sequencing
Normal Tracking
Ratiometric Tracking
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MIC68400
GND. The formula for output voltage given resistance
R from device adjust pin to GND is:
Enable Input
The enable input is programmed via J6.
The
MIC68400 may be enabled 3 ways:
1) From VIN (short EN and VIN jumpers),
2) From POR of adjacent device (Connect
EN to POR output of adjacent device)
3) From External source (drive the EN
jumper)
Voltage Adjustment
VOUT = 0.5 x ( 1 + ( 10.0K / R ) )
NOTE: If the MIC68400 adjustable device is replaced
by a fixed device, R1 should be shorted or replaced
with a low value resistor (1 Ohm).
Power on Reset (POR)
POR may be observed via J5. Jumper JP1 allows the
POR pullup resistor to be supplied from either VIN
(Pins 1&2 shorted) or VOUT (Pins 2&3 shorted).
Target voltage for the MIC68400 is controlled via JP4.
Jumper settings are:
1)
Pins 1&2 – 1.5V
2)
Pins 3&4 – 1.8V
3)
Pins 5&6 – 2.5V
4)
Pins 7&8 – 3.3V
Delay Programming
The Delay is programmed via JP2. For delay can be
either minimum (Open, or Pins 2&3 shorted) or
approximately 1mSec (Pins 1&2 shorted).
Ramp Control
Ramp Control and Tracking is programmed via JP3.
Shorting Pins 1&2 sets the output turn-on slew time
(time from turn on to full output) to approximately
0.5mSec for U1.
Other voltages are possible by changing resistor
values or adding a resistance from the adjust pin to
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MIC68400
Bill of Materials
Item
Part Number
Manufacturer
Description
C1, C2
GRM188R60J106ME47D
muRata
10µF/6.3V X5R
C1608X5R0J106K
TDK
JMK107 BJ106MA
TAIO YUDEN
Qty.
2
08056D106KAT
AVX
10uF/10V X5R
C3
VJ0603A102KXQPW1BC
Vitramon
1nF/10V
C4
VJ0603Y222KXXCW1BC
Vitramon
2.2nF/25V
1
R1, R6
CRCW06031002FKEYE3
Vishay Dale
10K , 0603, 1/16W, 1%
2
R1
CRCW06030000FKEYE3
Vishay Dale
Fixed Voltage: 0 Ohm , 0603, 1/16W, 1%, R2-R5 open
1
R2
CRCW06034991FKEYE3
Vishay Dale
4.99K , 0603, 1/16W, 1%
1
R3
CRCW06033831FKEYE3
Vishay Dale
3.83K , 0603, 1/16W, 1%
1
R4
CRCW06032491FKEYE3
Vishay Dale
2.49K , 0603, 1/16W, 1%
1
R5
CRCW06031781FKEYE3
Vishay Dale
1.78K , 0603, 1/16W, 1%
1
U1
MIC68400YML
Micrel, Inc.
4A FPGA LDO Regulator
1
1
Notes:
1. AVX:
www.avx.com
2. Murata:
www.murata.com
3. TDK:
www.tdk.com
4. Vishay:
www.vishay.com
5. Taiyo Yuden:
www.t-yuden.com
6. Vitramon: www.vitramon.com
7. Micrel Semiconductor:
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MIC68400
PCB Layout Artwork
TOP
BOTTOM
TOP SILKSCREEN
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MIC68400
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.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a
product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for
surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant
injury to the user. A 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 indemnify Micrel for any damages resulting from such use or sale.
© 2006 Micrel, Incorporated.
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