Microchip MIC5374/84 Manual

Microchip niet gecategoriseerd MIC5374/84

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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.

Produkt Specifikationer

Mærke: Microchip
Kategori: niet gecategoriseerd
Model: MIC5374/84

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