Microchip MIC5374/84 Handleiding

Microchip Niet gecategoriseerd MIC5374/84

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Pagina 1/6
MIC5374/84 Evaluation Board
Triple 200mA µCap LDO and 1mA
RTC LDO in 2.5mm x 2.5mm Thin MLF®
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
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 V BIAS 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.
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).
• 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 100K pull up Ω
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 V BIAS. The
RTC (LDO4) is always enabled when both V BIAS 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 V OUT
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 V OUT
(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.
Micrel, Inc. MIC5374/84 Evaluation Board
September 2010 2 M9999-092410-A
Application Information 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:
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.
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
=−6
DLY
DELAY 1.25x10
C1.25V x
(s)t
The delay time (tDELAY) is in seconds, the delay voltage is
1.25V internally, and the external delay capacitance (C DLY)
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.
Micrel, Inc. MIC5374/84 Evaluation Board
September 2010 3 M9999-092410-A
MIC5374 Evaluation Board Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1 − C4 C1608X5R0J106K TDK(1) 10μF, Ceramic, 6.3V, X5R, Size 0603 Capacitor 4
GRM155R1A1055KE19D Murata(2) 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
0402ZD105KAT2A AVX(3) 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
C5 − C8
LMK105BJ105KV-F Taiyo Yuden(4) 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor
4
R1 − 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
R7 CRCW040280K6FKEA Vishay(5) 80.6KΩ, 1%, 1/16W, Size 0402 Resistor 1
R8, R9 CRCW040220K0FKEA Vishay(5) 20KΩ, 1%, 1/16W, Size 0402 Resistor 2
U1 MIC5374-SJG1YMT Micrel, Inc.(6) High-Performance, Triple-Output, 200mA LDO with
RTC 1mA LDO, Active High Enable 1
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.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC5374/84

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