The EUP7965 is designed for portable and wireless
applications with demanding performance and space
requirements.
The EUP7965 is stable with a small 1µF ±30% ceramic
output capacitor. The EUP7965’s performance is
optimized for battery powered systems to deliver low
noise, low dropout voltage, low quiescent current and
excellent line and load transient response.
An optional external bypass capacitor reduces the
output noise further without slowing down the load
transient response. Power supply rejection is better
than 65dB at low frequencies. High power supply
rejection is maintained down to low input voltage
levels common to battery operated circuits. Other
features include a logic-controlled shutdown mode,
short-circuit and thermal-shutdown protection. The
EUP7965 is available in a SOT23-5,SOT23-6 package.
FEATURES
z 2.5 to 5.5V Input Range
z 150mA Guaranteed Output
z 70dB PSRR at 1kHz @ V
IN=VOUT
z50µVrms Output Noise (typ) over 10Hz to
100kHz
z 100mV Maximum Dropout with 150mA Load
z Low 85µA No-load Supply Current
z
1.5µA Shutdown Current
z Fast Start-up time.
z Stable with 1µF Ceramic Capacitors
z Thermal Shutdown and Short-circuit Protection
z Preset Output Voltage 1.5V, 1.8V, 2.5V, 2.8V,
2.85V, 3.0V ,3.3V, 4.8V ,5.0V and adjustable
z SOT23-5,SOT23-6 package
z RoHS Compliant and 100% Lead (Pb)-Free
+1V
APPLICATIONS
Block Diagram
z Cellular and Cordless Handsets
z Bluetooth, Wireless LAN
z PDAs and Palmtop Computers
z Portable Information Appliances
Figure 1.
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EUP7965
T ypical Application Circuit
Figure 2.
Figure 3.
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EUP7965
Pin Configurations
Part Number Pin Configurations
EUP7965
SOT23-5
EUP7965
SOT23-6
Pin Description
PIN SOT23-5 SOT23-6 DESCRIPTION
VIN 1 1 Input voltage of the LDO
GND 2 2 Common ground
VEN 3 3 Enable input logic, enable high
BYPASS 4 4 Optional bypass capacitor for noise reduction
SET 5
V
5 6 Output voltage of the LDO
OUT
Output voltage set. Not externally connected for the fixed versions.
Connect to resistor-divider for adjustable output voltage.
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EUP7965
Ordering Information
Order Number Package Type Marking Operating Temperatur e range
V
V
Junction Temperature ------------------------------------------------------------------- 150°C
Storage Temperature ------------------------------------------------------ -65°C to +150°C
Lead Temp ------------------------------------------------------------------------------ 235°C
Pad Temp ------------------------------------------------------------------------------- 235°C
Maximum Power Dissipation SOT23-5 --------------------------------------------- 364mW
Thermal Resistance θ
ESD Rating
------------------------------------------------------------------------------- -0.3 to 6V
IN,VEN
----------------------------------------------------------------- -0.3 to (V
Human Body Model -------------------------------------------------------------------
Operating Ratings
V
V
Junction Temperature ------------------------------------------------------ -40°C to +125°C
-------------------------------------------------------------------------------------- 2.5 to 5.5V
IN
------------------------------------------------------------------------- 0 to (VIN+0.3)
EN
Electrical Characteristics
Unless otherwise specified, all limits guaranteed for VIN= V
C
=0.01µF. Typical values and limits appearing in standard typeface are for TJ= 25°C.
BYPASS
OUT(nom)
+0.5V, CIN=1µF, I
Symbol Parameter Conditions
ΔV
Output Voltage Tolerance I
Line Regulation Error
OUT
= 1mA -2 2
OUT
V
IN
= (V
OUT(nom)
+0.5V) to 5.5V,
For 4.8 to 5.0 options
For all other options
+0.3)≤ 6V
IN
2kV
5.5V
≤
=1mA, C
OUT
OUT
=1µF,
EUP7965
Min Typ Max.
V
-0.19
-0.1
0.19
0.1
Unit
% of
OUT(nom)
%/V
Load Regulation Error I
PSRR
Power Supply Rejection
Ratio
IQ Quiescent Current
Dropout Voltage
= 1mA to 150mA 0.0025 0.005 %mA
OUT
V
IN=VOUT(nom)
=50mA*6
I
OUT
VEN=1.4V, I
For 4.8 to 5.0 options
For all other options
VEN = 1.4V, I
For 4.8 to 5.0 options
For all other options
V
= 0.4V 0.06 1.5
EN
I
= 1mA 0.5 2
OUT
I
= 50mA 25 35
OUT
I
= 100mA 50 70
OUT
= 150mA 75 100
I
OUT
+1V, f = 1kHz,
= 0mA
OUT
= 0 to 150mA
OUT
70 dB
100
85
155
140
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165
150
250
200
µA
mV
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EUP7965
Electrical Characteristics
Unless otherwise specified, all limits guaranteed for VIN= V
C
=0.01µF. Typical values and limits appearing in standard typeface are for TJ= 25°C.
BYPASS
OUT(nom)
+0.5V, CIN=1µF, I
=1mA, C
OUT
OUT
=1µF,
Symbol Parameter Conditions
Min Typ Max.
EUP7965
ISC Short Circuit Current Limit Output Grounded (Steady State) 600 mA
T
Turn-On TimeC
ON
e
IEN
VIL
VIH
Output Noise Voltage
n
Maximum Input Current at
EN
Maximum Low Level Input
Voltage at EN
Minimum High Level Input
Voltage at EN
Thermal Shutdown
Temperature
TSD
Thermal Shutdown
Hysteresis
BW = 10Hz to 100kHz,
C
VEN = 0.4 and VIN = 5.5 ±1 nA
VIN = 2.5 to 5.5V 0.4 V
VIN = 2.5 to 5.5V 1.4 V
160 °C
BYPASS
= 1µF
OUT
= 0.01µF
150
50 µVrms
20 °C
Unit
µs
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EUP7965
Typical Operating Characteristics
Unless otherwise specified, CIN=C
tied toV
IN.
=1µF Ceramic, C
COUT
=10nF, VIN=V
BYPASS
+0.2V, TA=25°C, Enable pin is
OUT
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EUP7965
Application Note
External Capacitors
Like any low-dropout regulator, the EUP7965 requires
external capacitors for
regulator stability. The EUP7965
is specifically designed for portable applications
requiring minimum board space and smallest components.
These capacitors must be correctly selected for good
performance.
Input Capacitor
An input capacitance of
1µF is required between the
≈
EUP7965 input pin and ground (the amount of the
capacitance may be increased without limit).
This capacitor must be located a distance of not more
than 1cm from the input pin and returned to a clean
analog ground. Any good quality ceramic, tantalum, or
film capacitor may be used at the input.
If a tantalum capacitor is used at the input, it must be
guaranteed by the manufacturer to have a
surge current
rating sufficient for the application.
There are no requirements for the ESR on the input
capacitor, but tolerance and temperature coefficient must
be considered when selecting the capacitor to
capacitance will be
1µF over the entire operating
≈
ensure the
temperature range.
Output Capacitor
The EUP7965 is designed specifically to work with very
small ceramic output capacitors. A ceramic capacitor
(temperature characteristics X7R, X5R, Z5U, or Y5V) in
1 to 22µF range with 5mΩ to
500mΩ ESR range is
suitable in the EUP7965 application circuit.
The output capacitor must meet the requirement for
minimum amount of capacitance and also have an ESR
(Equivalent Series Resistance) value which is within a
stable range (5mΩ to 500mΩ)
No-Load Stability
The EUP7965 will remain stable and in regulation with
no external load. This is specially important in CMOS
RAM keep-alive applications.
Capacitor Characteristics
The EUP7965 is designed to work with ceramic
capacitors on the output to take advantage of the benefits
they offer: for capacitance values in the range of 1µF to
4.7µF range, ceramic capacitors are the smallest, least
expensive and have the lowest ESR values (which makes
them best for eliminating high frequency noise). The
ESR of a typical 1µF ceramic capacitor is in the range of
20mΩ to 40mΩ, which easily meets the ESR requirement
for stability by the EUP7965.
The ceramic capacitor’s capacitance can vary with
temperature. The capacitor type X7R, which operates
over a temperature range of -55°C to +125°C, will only
vary the capacitance to within ±15%. Most large value
ceramic capacitors (
2.2µF) are manufactured with Z5U
≈
or Y5V temperature characteristics. Their capacitance
can drop by more than 50% as the temperature goes from
25°C to 85°C. Therefore,
X7R is recommended over Z5U
and Y5V in applications where the ambient temperature
will change significantly above or below 25°C.
Noise Bypass Capacitor
Connecting a 0.01µF capacitor between the
C
BYPASS
and ground significantly reduces noise on the regulator
output. This cap is connected directly to a high
impedance node in the bandgap reference circuit. Any
significant loading on this node will cause a change on
the regulated output voltage.
For this reason, DC leakage
current through this pin must be kept as low as possible
for best output voltage
accuracy. The types of capacitors
best suited for the noise bypass capacitor are ceramic and
film.
Unlike many other LDO’s , addition of a noise reduction
capacitor does not effect the
load transient response of
the device.
On/Off Input Operation
V
The EUP7965 is turned off by pulling the
pin low,
EN
and turned on by pulling it high. If this feature is not used,
the V
output on at all time.
signal source used to drive the V
pin should be tied toVIN to keep the regulator
EN
To assure proper operation, the
input must be able
EN
to swing above and below the specified turn-on/off
voltage thresholds listed in the Electrical Characteristics
section under V
and VIH.
IL
Fast Start up
The EUP7965 output starts up after Vref voltage reaches
its final value (1.23V nomial). The start-up time is
determined by the time constant of the bypass capacitor.
The smaller the capacitor value., the shorter the start-up
time, but less noise gets reduced. As a result, start-up
time and noise reduction need to be taken into design
consideration when choosing the value of the bypass
capacitor.
pin
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EUP7965
Adjustable Operation
The adjustable version of the EUP7965 has an output
voltage range of 1.25V to 5V. The output voltage of the
EUP7965 adjustable regulator is programmed using an
external resistor divider as shown in Figure3. The output
voltage is calculated using:
R
1
(1VV
refO
Where:
Vref=1.23V typ. (the internal reference voltage)
Utilize the following equation for adjusting the output to
a particular voltage:
V
RP
I
2
1.23V
Choose R
rejection, noise and power consumption.
In order to improve the stability of the adjustable version,
it is suggested that a small compensation capacitor C
placed between V
=100k to optimize accuracy, power supply
2
)
+×=
R
2
O
−=1
and SET .
OUT
be
1
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EUP7965
Packaging Information
SOT23-5
Note:
1. Package body sizes exclude mold flash protrusions or gate burrs.