MIC5374/84 Evaluation Board

MIC5374/84 Evaluation Board
Triple 200mA µCap LDO and 1mA
RTC LDO in 2.5mm x 2.5mm Thin MLF®
General Description
The MIC5374/84 is an advanced, general purpose, four
output device with three 200mA LDOs and a Real Time
Clock (RTC) 1mA LDO, which is ideal for application
processor support in mobile platforms. The MIC5374
provides independent control active high enables for each
of the LDO outputs with the 1mA RTC LDO always
enabled. The MIC5384 provides active low enables.
The MIC5374/84 incorporates a Power-On-Reset (POR)
supervisor with adjustable delay time set by an external
capacitor, and an independent input pin to monitor any
voltage level. Once high, the POR output can be asserted
low again by enabling the Manual Reset (MR) pin. When
the MR pin is restored low the POR output will re-time the
delay set by the external delay capacitor.
An input capacitor is required when the power supply is
more than four inches from the device. The evaluation
board includes an input capacitor of 10µF to compensate
for long inductive test leads.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Requirements
The MIC5374/84 evaluation board requires two power
supplies. The first supply must be able to provide a
minimum of 800mA with a voltage range of 1.7V to 5.5V to
the INLDO pins. The second supply for VBIAS must be able
to supply 10mA with a voltage range of 2.5V to 5.5V. For
input voltages of 2.5V or greater a single supply can be
used for both the INLDO and VBIAS. The output load can be
either active or passive.
Precautions
The MIC5374/84 evaluation board does not have reverse
polarity protection. Applying a negative voltage to the
INLDO or VBIAS terminals may damage the device.
• Connect an External Supply to INLDO. Apply the
desired input voltage to the INLDO (J4 for LDO1 and
LDO2, J5 for LDO3, and J3 for LDO4) and ground (J2,
J6, J11, and J13) terminals of the evaluation board,
paying careful attention to polarity and supply voltage
(1.7V ≤ INLDO ≤ 5.5V). An ammeter can be placed
between the input supply and the INLDO terminal of the
evaluation board. Ensure that the supply voltage is
monitored at the INLDO terminals. The ammeter and/or
power lead resistance can reduce the voltage supplied
to the input.
• Enable/Disable the MIC5374/84. The MIC5374
evaluation board is supplied with 100KΩ pull up
resistors (R1, R2, R3) on the EN1, EN2, and EN3 pins
for default on state. While the MIC5384 has pull down
resistors (R1b, R2b, R3b) for default on state. To
disable the MIC5373 jumper the enable terminal (J15 for
LDO1, J16 for LDO2, and J17 for LDO3) to GND. To
disable the MIC5383 jumper the enable terminal (J15 for
LDO1, J16 for LDO2, and J17 for LDO3) to VBIAS. The
RTC (LDO4) is always enabled when both VBIAS and
INLDO4 are provided. The enable pins must be either
pulled high or low. Leaving enable pins floating will
cause the regulator to operate in an indeterminate state.
• Connect the Load. Connect the loads to the VOUT
terminals (J7 for LDO1, J8 for LDO2 and J9 for LDO3)
and ground terminals (J2, J6, J11, or J13). The loads
can be either passive (resistor) or active (electronic
load). Be sure to monitor the output voltage at the VOUT
(J7, J8 and J9) terminals.
Ordering Information
Part Number
Description
MIC5374-SJG1YMT EV
Triple Output LDO with RTC
Evaluation Board. VOUT1 = 3.3V,
VOUT2 = 2.5V, VOUT3 = 1.8V, VOUT4
= 1.0V. Active High Enables.
MIC5384-MG44YMT EV
Triple Output LDO with RTC
Evaluation Board. VOUT1 = 2.8V,
VOUT2 = 1.8V, VOUT3 = 1.2V, VOUT4
= 1.2V. Active Low Enables.
Getting Started
• Connect an External Supply to VBIAS. Apply the
desired input voltage to the VBIAS (J1) and ground (J2)
terminal of the evaluation board, paying careful attention
to polarity and supply voltage (2.5V ≤ VBIAS ≤ 5.5V).
MLF and MicroLeadFrame are registered 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
September 2010
M9999-092410-A
Micrel, Inc.
Application Information
Power-On-Reset (POR)
The Power-On-Reset (POR) pin is an open drain output. A
100kΩ pull up resistor to VBIAS is provided. POR is
asserted high when the voltage at DLY reaches 1.25V. A
delay can be added by placing a capacitor from the DLY
pin to ground.
Power-On-Reset Input (POR_IN)
The Power-On-Reset Input (POR_IN) pin compares any
voltage to an internal 0.9V reference. This function can be
used to monitor any of the LDO outputs or any external
voltage rail. When the monitored voltage is greater than
0.9V, the POR_IN flag will internally trigger a 1.25µA
source current to charge the external capacitor at the DLY
pin. A resistor divider network (R5 – R8) is provided to
divide down the monitored voltage to be compared with
the 0.9V at the POR_IN. The monitored voltage can be
selected by changing the jumpers (TP2 for VOUT3, TP3 for
VOUT2, and TP4 for VOUT1). The resistor divider network can
be changed to set the trigger point to any voltage level. A
small decoupling capacitor (C9) of 10nF is recommended
between POR_IN and ground to reject high frequency
noise that might interfere with the POR circuit. Do not
leave the POR_IN pin floating if the POR output is being
monitored. A floating POR_IN pin will cause an
indeterminate state on the POR pin.
September 2010
MIC5374/84 Evaluation Board
Delay (DLY)
The Delay (DLY) pin is used to set the POR delay time.
Adding a capacitor to this pin (C10) adjusts the delay of
the POR signal. When the POR_IN flag is triggered, a
constant 1.25µA current begins to charge the external
capacitor tied to the DLY pin. When the capacitor reaches
1.25V the POR will be pulled high by the external pull up
resistor. The equation to calculate the charge time is
shown:
⎛ 1.25V x C DLY
t DELAY (s) = ⎜⎜
⎝ 1.25x10 −6
⎞
⎟⎟
⎠
The delay time (tDELAY) is in seconds, the delay voltage is
1.25V internally, and the external delay capacitance (CDLY)
is in microfarads. For a 1µF delay capacitor, the delay time
will be 1 second. A capacitor at the DLY pin is
recommended when the POR function is used in order to
prevent unexpected triggering of the POR signal in noisy
systems.
Manual Reset (MR)
The Manual Reset (MR) pin resets the output of POR and
DLY generator regardless if the monitored voltage is in
regulation or not. Applying a voltage greater than 1.2V on
the MR pin will cause the POR voltage to be pulled low.
When a voltage below 0.2V is applied to the MR pin, the
internal 1.25µA will begin to charge the DLY pin until it
reaches 1.25V. When the DLY pin reaches 1.25V, the
POR voltage will be pulled high by the pull up external
resistor again. Do not leave the MR pin floating. A 100kΩ
pull-down resistor (R4) is provided on the evaluation board
to ensure that the manual reset is disabled.
2
M9999-092410-A
Micrel, Inc.
MIC5374/84 Evaluation Board
MIC5374 Evaluation Board Schematic
Bill of Materials
Item
C1 − C4
Part Number
C1608X5R0J106K
GRM155R1A1055KE19D
C5 − C8
0402ZD105KAT2A
LMK105BJ105KV-F
R1 − R5, R10
CRCW0402100KFKEA
Manufacturer
TDK
(1)
Qty.
10μF, Ceramic, 6.3V, X5R, Size 0603 Capacitor
(2)
Murata
4
1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
AVX(3)
Taiyo Yuden
Description
4
1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
(4)
1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
(5)
100KΩ, 1%, 1/16W, Size 0402 Resistor
6
(5)
Vishay
R6
CRCW0402180KFKEA
Vishay
180KΩ, 1%, 1/16W, Size 0402 Resistor
1
R7
CRCW040280K6FKEA
Vishay(5)
80.6KΩ, 1%, 1/16W, Size 0402 Resistor
1
R8, R9
CRCW040220K0FKEA
(5)
20KΩ, 1%, 1/16W, Size 0402 Resistor
2
U1
MIC5374-SJG1YMT
High-Performance, Triple-Output, 200mA LDO with
RTC 1mA LDO, Active High Enable
1
Vishay
Micrel, Inc.(6)
Notes:
1.
TDK: www.tdk.com.
2.
Murata: www.murata.com.
3.
AVX: www.avx.com.
4.
Taiyo Yuden: www.t-Yuden.com.
5.
Vishay: www.vishay.com.
6.
Micrel, Inc.: www.micrel.com.
September 2010
3
M9999-092410-A
Micrel, Inc.
MIC5374/84 Evaluation Board
MIC5384 Evaluation Board Schematic
Bill of Materials
Item
C1 − C4
Part Number
C1608X5R0J106K
GRM155R1A1055KE19D
C5 − C8
0402ZD105KAT2A
LMK105BJ105KV-F
Manufacturer
TDK
(1)
Description
Qty.
10μF, Ceramic, 6.3V, X5R, Size 0603 Capacitor
(2)
Murata
1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
AVX(3)
1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
Taiyo Yuden
(4)
4
4
1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
R1b, R2b, R3b,
R4, R5, R10
CRCW0402100KFKEA
Vishay
(5)
100KΩ, 1%, 1/16W, Size 0402 Resistor
6
R6
CRCW0402180KFKEA
Vishay(5)
180KΩ, 1%, 1/16W, Size 0402 Resistor
1
CRCW040280K6FKEA
(5)
80.6KΩ, 1%, 1/16W, Size 0402 Resistor
1
20KΩ, 1%, 1/16W, Size 0402 Resistor
2
High-Performance, Triple-Output, 200mA LDO with
RTC 1mA LDO, Active Low Enable
1
R7
R8, R9
U1
CRCW040220K0FKEA
MIC5384-MG44YMT
Vishay
(5)
Vishay
Micrel, Inc.
(6)
Notes:
1.
TDK: www.tdk.com.
2.
Murata: www.murata.com.
3.
AVX: www.avx.com.
4.
Taiyo Yuden: www.t-Yuden.com.
5.
Vishay: www.vishay.com.
6.
Micrel, Inc.: www.micrel.com.
September 2010
4
M9999-092410-A
Micrel, Inc.
MIC5374/84 Evaluation Board
PCB Layout Recommendations
Top Layer
Bottom Layer
September 2010
5
M9999-092410-A
Micrel, Inc.
MIC5374/84 Evaluation Board
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
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right
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.
© 2010 Micrel, Incorporated.
September 2010
6
M9999-092410-A