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LD1985-25-AF5-R Datasheet(PDF) 7 Page - Unisonic Technologies

No. de pieza LD1985-25-AF5-R
Descripción Electrónicos  VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION
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Fabricante Electrónico  UTC [Unisonic Technologies]
Página de inicio  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

LD1985-25-AF5-R Datasheet(HTML) 7 Page - Unisonic Technologies

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LD1985
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
7 of 10
www.unisonic.com.tw
QW-R102-021,C
APPLICATION INFORMATION
EXTERNAL CAPACITORS
An external capacitor for regulator stability is required. This capacitor must be selected to meet the requirements
of minimum capacitance and equivalent series resistance. It is recommended to solder input and output capacitors
as close as possible to the relative pins.
INPUT CAPACITOR
A 1µF input capacitor (ceramic, tantalum or film capacitors can be used) is required with the UTC LD1985 (amount
of capacitance can be increased without limit). This capacitor must be located a distance less than 0.5" from the
input pin of the device and returned to a clean analog ground.
OUTPUT CAPACITOR
The output capacitor must meet both the requirement for minimum amount of capacitance and E.S.R. (equivalent
series resistance) value. The output capacitor must maintain its ESR in the stable region over the full operating
temperature to assure stability. Also, capacitor tolerance and variation with temperature must be considered to
assure the minimum amount of capacitance is provided over time. Due to the different loop gain and the stability
improves for higher output versions, if low E.S.R. ceramic type is used, the recommended minimum output capacitor
value are is 1µF for output voltages equal or major than 3.8V, 2.2µF for VOUT going from 1.8~3.3V, and 3.3µF for the
other versions. However, if an output capacitor lower than the suggestion, it's possible to make stable the regulator
adding a resistor in series to the capacitor. This capacitor should be located not more than 0.5" from the output pin of
the device and returned to a clean analog ground.
INHIBIT INPUT OPERATION
The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current
consumption down to less than 1µA. When the inhibit feature is not used, this pin must be tied to VIN to keep the
regulator output ON over time. To assure proper operation, the signal source used to drive the inhibit pin must be
able to swing above and below the specified thresholds listed in the electrical characteristics section under VIH, VIL.
Any slew rate can be used to drive the inhibit.
REVERSE CURRENT
The power transistor used in the UTC LD1985 has not an inherent diode connected between the regulator input
and output. If the output is forced above the input, no current will flow from the output to the input across the series
pass transistor. When a VREV voltage is applied on the output, the reverse current measured flows to the GND
across the two feedback resistors. This current typical value is 160µA. R1 and R2 resistors are implanted type; and
typical values are respectively 42.6 KΩ and 51.15 KΩ.
2
VREV
Bypass
IN
1μF
+
VIN
INH
VINH
1
GND
R2
R1
OUT
4.7μF
+
A
VIN
Fig 1. REVERSE CURRENT TEST CIRCUIT


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