Eutech EUP7987-18VIR0 300ma low-noise ultra low-dropout cmos regulator Datasheet

EUP7987
300mA Low-Noise Ultra Low-Dropout
CMOS Regulator
DESCRIPTION
FEATURE
z
The EUP7987 low-noise, low-dropout, linear
regulator operates from a 2.5V to 5.5V input and is
guaranteed to deliver 300mA.
z
z
z
z
z
z
z
z
z
z
The EUP7987 is stable with small 2.2µF ceramic
capacitor. Its performance suits battery powered
applications because of its shutdown mode (60 nA
typ), low quiescent current (110µA typ), and LDO
voltage (140mV typ). The low dropout voltage
allows for more utilization of a battery’s available
energy by operating closer to its end-of-life voltage.
The EUP7987 is available in 1.8V, 2.5v, 2.8V, 3V,
3.3V, and adjustable versions.
300mA Guaranteed Output Current (500mA for
Pulsed Loads)
60dB PSRR at 1kHz
50µ VRMS Output Voltage Noise
140mV Dropout at 300mA Load
Low 110µA No-Load Supply Current
≤ 1µA Shutdown Current
Fast Start-up Time
Stable With 2.2µF Ceramic Output Capacitors
Thermal Shutdown and Short-Circuit Protection
SOT23-5 and SOT23-6 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z
z
z
z
Wireless Handsets
DSP Core Power
Battery Powered Electronics
Portable Information Appliances
Block Diagram
Figure1.
DS7987 Ver 1.5 May .2005
1
EUP7987
Typical Application Circuit
Figure2. Fixed-Voltage LDO Regulator
Figure3 Adjustable LDO Regulator Programming
DS7987 Ver 1.5 May .2005
2
EUP7987
Pin Configurations
Part
Number
Pin
Configurations
EUP7987
SOT23-5
The set pin is internally
disconnected for the fixed
versions
EUP7987
SOT23-6
Pin Description
PIN
SOT23-5
SOT23-6
VIN
1
1
Input voltage of the LDO
GND
2
2
Common Ground
SHDN
3
3
SHDN places the entire device in shutdown mode when held low.
BP
4
4
Compensation capacitor for noise reduction
Output voltage set. Not externally connected for the fixed versions.
Connect to resistor-divider for adjustable output voltage.
SET
VOUT
5
5
DS7987 Ver 1.5 May .2005
6
DESCRIPTION
Output voltage of the LDO
3
EUP7987
Ordering Information
Order Number
EUP7987-18VIR1
EUP7987-18VIR0
EUP7987-25VIR1
EUP7987-25VIR0
EUP7987-28VIR1
EUP7987-28VIR0
EUP7987-30VIR1
EUP7987-30VIR0
EUP7987-33VIR1
EUP7987-33VIR0
EUP7987VIR1
EUP7987VIR0
Package Type
Marking
Operating Temperature range
SOT23-5
J1 □ □
-40°C to 85°C
SOT23-5
J2 □ □
-40°C to 85°C
SOT23-5
J6 □ □
-40°C to 85°C
SOT23-5
J5 □ □
-40°C to 85°C
SOT23-5
J3 □ □
-40°C to 85°C
SOT23-6
JA □ □
-40°C to 85°C
EUP7987 □ □ □ □ □ □
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
C: Commercial
Package Type
V: SOT23
Output Voltage
18: 1.8V
25: 2.5V
28: 2.8V
30: 3.0V
33: 3.3V
Blank: Adjustable
DS7987 Ver 1.5 May .2005
4
EUP7987
Absolute Maximum Ratings
„
VIN, VOUT, V SHDN , VSET , VCC,
„
Storage Temperature Range ------------------------------------------------------------- -65°C to 160°C
Junction Temperature (TJ) -----------------------------------------------------------------------150°C
Lead Temperature (10 sec.) ------------------------------------------------------------------------260°C
„
„
----------------------------------------------------------- -0.3V to 6V
Electrical Characteristics
Unless otherwise specified, all limits guaranteed for VIN= VO +0.5V, VSHDN=VIN, CIN=COUT=2.2µF, CCC=22nF,
TJ =25°C. (Boldface limits apply for the operating temperature extremes: -40°C and 85°C)
Symbol
Parameter
VIN
Input Voltage
∆ VO
Output Voltage Tolerance
VO
Output Adjust Range
IO
Maximum Output Current
ILIMIT
IQ
∆ VO
Supply Current
Dropout Voltage
Line Regulation
Load Regulation
en
100µA ≤ IOUT ≤ 300mA
VIN=VO+0.5V,
SET= OUT for the Adjust Versions
Adjust Version Only
Continuous
10ms pulse
EUP7987
Min
Typ
Max.
Output Voltage Noise
Unit
V
2.5
-2
5.5
+2
-3
+3
1.25
300
5.5
V
mA
mA
mA
200
µA
1
µA
200
mV
0.1
%/V
500
600
110
240
0.06
Output Current Limit
Shutdown Supply Current
VDO
Conditions
IOUT=0mA
IOUT=300mA
VO =0V, SHDN =GND
IOUT =1mA
% of
VOUT(NOM)
0.4
IOUT =200mA
90
IOUT =300mA
IOUT = 1mA, (VO +0.5V) ≤ VI
≤ 5.5V
100µA ≤ IOUT ≤ 300mA
IOUT =10mA, 10Hz ≤ f
≤ 100kHz
VIH,(VO+0.5V) ≤ VI ≤ 5.5V
140
-0.1
0.05
0.002
%/mA
50
µVRMS
1.6
V
VSHDN
SHDN Input Threshold
ISHDN
ISET
SHDN Input Bias Current
SHDN =GND or IN
0.1
100
nA
SET Input Leakage
SET = 1.3V, Adjust Version Only
0.1
2.5
nA
TSD
TON
PSRR
VIL,(VO+0.5V) ≤ VI ≤ 5.5V
0.4
Thermal Shutdown Temperature
160
Thermal Shutdown Hysteresis
20
Start-Up Time
Power Supply Rejection Ratio
DS7987 Ver 1.5 May .2005
COUT =10µF, VO at 90% of Final
Value
VIN=VOUT+0.5V, f=1kHZ
5
°C
80
µs
60
dB
EUP7987
Typical Operating Characteristics
Unless otherwise specified, VIN = VO + 0.5V, CIN=COUT = 2.2 µF, CCC= 22 nF, TJ= 25°C, VSHDN=VIN
Dropout Voltage vs. Load Current
Output Voltage Change vs Temperature
160
0.2
140
Dropout Voltage(mV)
Vout Change (%)
0.0
-0.2
-0.4
-0.6
120
100
Tj= -40
Tj=25
Tj=85
80
60
40
20
0
14
0
12
0
10
0
50
20
0
-2
0
-5
5
-4
0
-0.8
0
T emperature
50
300
150
250
Supply Current (uA)
Supply Current(uA)
150
200
Load Current(mA)
250
300
Supply Current vs Load Current
Supply Current vs. Input Voltage(SOT25)
175
125
100
TA= 25
TA= 85
Tj=-40
75
50
200
Tj=25
Tj=85
TJ=-40
150
100
50
25
0
0
2.6
3
3.4 3.8 4.2
4.6
5
5.4
0
5.8
Input Voltage(V)
Input Voltage vs Output Voltage(SOT25)
2.55
2.5
Vo(V)
100
2.45
2.4
2.35
2.3
3
3.5
4
4.5
5
5.5
6
Vin(V)
DS7987 Ver 1.5 May .2005
6
50
100
150
200
Load Current(mA)
250
300
EUP7987
Output Noise (10kHz to 100kHz)
Shutdown Response
DS7987 Ver 1.5 May .2005
7
EUP7987
Application Information
Noise Bypass Capacitor
An external 10nF bypass capacitor at BP pin conjunction
with an internal resistor creates lowpass filter. Increasing
the capacitance will decrease the output noise. 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. However, it does affect start-up time. The
smaller the capacitance value, the quicker the start-up
time.
External Capacitors
Like any low-dropout regulator, the EUP7987 requires
external capacitors for regulator stability. The EUP7987
is specifically designed for portable applications
requiring minimum board space and smallest components.
These capacitors must be correctly selected for good
performance.
Input Capacitor
A minimum input capacitance of 1µF is required between
the EUP7987 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.
Power Dissipation and Junction Temperature
Specified regulator operation is assured to a junction
temperature of 125°C; the maximum junction
temperature should be restricted to 125°C under normal
operating conditions. This restriction limits the power
dissipation the regulator can handle in any given
application. To ensure the junction temperature is within
acceptable limits, calculate the maximum allowable
dissipation, PD(max), and the actual dissipation, PD, which
must be less than or equal to PD(max)
The maximum-power-dissipation limit is determined
using the following equation:
No-Load Stability
The EUP7987 will remain stable and in regulation with
no external load. This is specially important in CMOS
RAM keep-alive applications.
Output Capacitance
The EUP7987 is specifically designed to employ ceramic
output capacitors as low as 2.2µF. Ceramic capacitors
below 10µF offer significant cost and space savings,
along with high frequency noise filtering. Higher values
and other types and of capacitor may be used, but their
equivalent series resistance (ESR) should be maintained
below 0.5Ω. Ceramic capacitor of the value required by
the EUP7987 are available in the following dielectric
types: Z5U, Y5V, X5R, and X7R. The Z5U and Y5V
types exhibit a 50% or more drop in capacitance value as
their temperature increase from 25°C, an important
consideration. The X5R generally maintain their
capacitance value within ± 20%. The X7R type are
desirable for their tighter tolerance of 10% over
temperature.
P
D(max)
T max − T
A
= J
R
θJA
Where:
TJMAX is the maximum allowable junction temperature.
RθJA is the thermal resistance junction-to-ambient for the
package
TA is the ambient temperature.
The regulator dissipation is calculated using:
PD=(VI-VO) × IO
Power dissipation resulting from quiescent current is
negligible. Excessive power dissipation triggers the
thermal protection circuit.
DS7987 Ver 1.5 May .2005
8
EUP7987
Adjustable Operation
Shutdown
The adjustable version of the EUP7987 has an output
voltage range of 1.25V to 6V. The output voltage of the
EUP7987 adjustable regulator is programmed using an
external resistor divider as shown in Figure3. The output
voltage is calculated using:
R
V = V × (1 + 1 )
O
ref
R
The EUP7987 goes into sleep mode when the SHDN
pin is in a logic low condition. During this condition, the
pass transistor, error amplifier, and bandgap are turned
off, reducing the supply current to 60nA typical. The
SHDN pin may be directly tied to VIN to keep the part
on.
2
Fast Start-up
Where:
Vref=1.23V typ. (the internal reference voltage)
The EUP7987 provides fast start-up time for better
system efficiency. The start-up speed is maintained when
using the optional noise bypass capacitor.
Utilize the following equation for adjusting the output to
a particular voltage:
 V

PI = R 2  O − 1
1.23V 
Choose R2=100k to optimize accuracy, power supply
rejection, noise and power consumption.
In order to improve the stability of the adjustable version,
it is suggested that a small compensation capacitor C1 be
placed between VOUT and SET
DS7987 Ver 1.5 May .2005
9
EUP7987
Packaging Information
SOT23-5
Note:
1. Package body sizes exclude mold flash protrusions or gate burrs.
2. Tolerance ± 0.1000mm (4 mil) unless otherwise specified.
3. Coplanarity: 0.1000mm
4. Dimension L is measured in gage plane.
Symbols
A
A1
A2
b
C
D
E
e
H
L
θ1
DS7987 Ver 1.5 May .2005
Min.
1.00
0.00
0.70
0.35
0.12
2.70
1.50
----2.6
0.37
14
Dimension in Millimeters
Nom
1.10
----0.80
0.40
0.15
2.90
1.60
1.90(Typ.)
2.8
----5
10
Max.
1.30
0.10
0.90
0.50
0.20
3.10
1.70
----3.00
----9
EUP7987
SOT23-6
SYMBOLS
A
A1
A2
b
C
D
E
E1
e
E1
L
L1
L2
R
R1
θ
θ1
DS7987 Ver 1.5 May .2005
DIMENSIONS IN MILLIMETERS
MIN.
NOM.
--------------------0.90
1.15
0.30
-----0.08
-----2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.30
0.45
0.60 REF
0.25 BSC
0.10
-----0.10
-----0°
4°
5°
10°
11
MAX.
1.45
0.15
1.30
0.50
0.22
0.60
-----0.25
8°
15°
Similar pages