Page 1
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
ULTRA SMALL MICROPOWER SC70 LOW DROPOUT REGULATORS
DESCRIPTION
The ZXCL series are very small low dropout
regulators designed for use in low power and
severely space limited applications.
The devices operate with a low dropout voltage,
typically of only 85mV at 50mA load. Supply current
is minimised with a ground pin current of only 50µA
at full 150mA load. Logic control allows the devices
to be shut down, consuming typically less than 10nA.
These features make the device ideal for battery
powered applications where power economy is
critical.
The parts have been designed with space sensitive
systems in mind. They are available in the ultra small
SC70 package, which is half the size of other SOT23
based regulator devices.
For applications requiring improved performance
over alternative devices, the ZXCL is also offered in
the 5 pin SOT23 package with an industry standard
pinout.
The devices feature thermal overload and
over-current protection and are available with output
voltages of 2.5V, 2.6V, 2.8V, 3V, 3.3V and 4V. Other
voltage options between 1.5V and 4V can be
provided. Contact Zetex marketing for further
information.
The ZXCL series are manufactured using CMOS
processing, however advanced design techniques
mean that output noise is improved even when
compared to other bipolar devices.
FEATURES
5-pin SC70 package for the ultimate in space
•
saving
5-pin SOT23 industry standard pinout
•
•
Low 85mV dropout at 50mA load
•
50µA ground pin current with full 150mA load
•
Typically less than 10nA ground pin current on
shutdown
•
2.5, 2.6, 2.8, 3, 3.3 and 4 volts output
•
Very low noise, without bypass capacitor
•
Thermal overload and over-current protection
•
-40 to +85°C operating temperature range
PACKAGE FOOTPRINT
Total Aea
2.1mm x 2mm
=4.2mm
Total Aea
2.8mm x 2.9mm
=8.12mm
2
2
APPLICATIONS
Cellular and Cordless phones
•
Palmtop and laptop computers
•
• PDA
•
Hand held instruments
•
Camera, Camcorder, Personal Stereo
•
PCMCIA cards
•
Portable and Battery-powered equipment
TYPICAL APPLICATION CIRCUIT
Battery Supply
ZXCL
Output Voltage
ISSUE 5 - NOVEMBER 2001
1
Page 2
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage with respect to GND
V
IN
E
N
V
O
Package Power Dissipation (T
SC70 300mW (Note 1)
SOT23-5 450mW (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
V
= VO+ 0.5V, typical values at TA = 25 C V (Unless otherwise stated)
IN
SYMBOL PARAMETER CONDITIONS LIMITS UNITS
-0.3V to 7.0V
-0.3V to 10V
-0.3V to 5.5V
=25°C)
A
Output short circuit duration Infinite
Continuous Power Dissipation Internally limited
Operating Temperature Range -40°C to +85°C
Storage Temperature Range -55°C to +125°C
MIN TYP MAX
V
IN
V
O
∆V
O
I
O(MAX)
I
OLIM
I
Q
Input Voltage (note2) 5.5 V
I
Output Voltage
Output Voltage
/∆T
Temperature
Coefficient
Output Current
Over Current Limit
Ground pin current
=1mA
O
ZXCL250
ZXCL260
ZXCL280
ZXCL300
ZXCL330
ZXCL400
= 100mA
I
O
+0.5V<VIN<VINmax.
V
O
ZXCL250
ZXCL260
ZXCL280
ZXCL300
ZXCL330
ZXCL400
ZXCL250 only
ZXCL250 only
No Load
= 150mA,
I
O
= 100mA,
I
O
2.450
2.548
2.744
2.940
3.234
3.920
2.425
2.522
2.744
2.910
3.201
3.880
150
100
160
105
2.5
2.6
2.8
3.0
3.3
4.0
-15 ppm/°C
230
25
50
40
ISSUE 5 - NOVEMBER 2001
2.550
2.652
2.856
3.060
3.366
4.080
2.575
2.678
2.884
3.090
3.399
4.120
800
750
50
120
100
V
V
mA
mA
A
A
A
2
Page 3
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
ELECTRICAL CHARACTERISTICS
V
= VO+ 0.5V, typical values at TA=25°C (Unless otherwise stated)
IN
SYMBOL PARAMETER CONDITIONS LIMITS UNITS
MIN TYP MAX
V
⌬V
⌬V
E
V
V
V
I
I
T
DO
N
ENH
ENL
ENHS
EN
QSD
SD
LNR
LDR
Dropout Voltage
Note 3
Line Regulation VIN=(VO+0.5V) to 5.5V, IO=1mA 0.02 0.1 %/V
Load Regulation IO=1mA to 100mA 0.01 0.04 %/mA
Output Noise Voltage
Enable pin voltage for
normal operation
Enable pin voltage for
output shutdown
Enable pin hysteresis 150 mV
Enable Pin input
current
Shutdown supply
current
Thermal Shutdown
Temperature
ZXCL250
I
=10mA
O
I
=50mA
O
I
=100mA
O
ZXCL260
I
=10mA
O
I
=50mA
O
I
=100mA
O
ZXCL280
I
=10mA
O
I
=50mA
O
I
=100mA
O
ZXCL300
I
=10mA
O
I
=50mA
O
I
=100mA
O
ZXCL330
I
=10mA
O
I
=50mA
O
I
=100mA
O
ZXCL400
=10mA
I
O
I
=50mA
O
I
=100mA
O
f=10Hz to 100kHz, C
T
= -40°C
A
=10µF,
O
2
2.2
15
85
163
15
85
155
15
85
140
15
85
140
15
85
140
15
85
140
50
325
mV
mV
310
mV
280
mV
280
mV
280
mV
280
µV rms
10 V
00.8V
VEN=5.5V 100 nA
VEN=0V 1
µA
125 165 °C
Device testing is performed at TA=25⬚C. Device thermal performance is guaranteed by design.
Note1: Maximum power dissipation is calculated assuming the device is mounted on a PCB measuring 2
inches square
Note 2: Output Voltage will start to rise when V
operation, V
Note 3: Dropout voltage is defined as the difference between V
(min) > V
IN
(nom) + 0.5V.
OUT
exceeds a value or approximately 1.3V. For normal
IN
and VO, when VOhas dropped 100mV below
IN
ISSUE 5 - NOVEMBER 2001
3
Page 4
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
TYPICAL CHARACTERISTICS (ZXCL280 shown)
6
5
4
V
3
2
Voltage (V)
1
0
0123456
I
I
OUT
OUT
IN
=100mA
=1mA
Input Voltage (V)
Input to Output Characteristics
2.81
VIN=3.3V
No Load
2.80
Output Voltage (V)
2.79
-50 -25 0 25 50 75 100
Temperature (°C)
Output Voltage v Temperature
0.25
0.20
0.15
0.10
0.05
Dropout Voltage (V)
0.00
0 25 50 75 100 125 150 175
Output Current (mA)
Dropout Voltage v Output Current
25.0
VIN=3.3V
24.8
No Load
24.6
24.4
24.2
24.0
23.8
23.6
23.4
Ground Current (µA)
23.2
23.0
-50 -25 0 25 50 75 100
Temperature (°C)
Ground Current v Temperature
30
No Load
25
20
15
10
5
Ground Current (µA)
0
012345
Input Voltage (V)
Ground Current v Input Voltage
60
55
50
45
40
35
30
Ground Current (µA)
25
20
0 25 50 75 100 125 150
VIN=5V
VIN=3.3V
Load Current (mA)
Ground Current v Load Current
ISSUE 5 - NOVEMBER 2001
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Page 5
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
TYPICAL CHARACTERISTICS (ZXCL280 shown)
6
C
=1mF
OUT
5
4
3
2
Voltage (V)
1
0
0 102030405060708090100
Enable
VIN=5V
IL= 1mA
IL= 100mA
VIN= 3.3V
IL= 1mA
IL= 100mA
Time (µs)
Start-Up Response
6
5
(V)
4
IN
3
20
10
(mV) V
0
OUT
-10
V
D
-20
0.0 0.1 0.2 0.3 0.4 0.5
Time (ms)
C
=1mF
OUT
Tr&Tf= 2.5ms
Line Rejection IL=1mA
100
50
(mA)
0
L
100
50
(mV) I
0
OUT
-50
V
D
-100
0.0 0.1 0.2 0.3 0.4 0.5
C
=10mF
OUT
C
=1mF
OUT
VIN=5V
IL= 1mA to 50mA
C
=1mF
OUT
C
OUT
Time (ms)
Load Response
6
5
(V)
4
IN
3
20
10
(mV) V
0
OUT
-10
V
-20
D
0.0 0.1 0.2 0.3 0.4 0.5
Time (ms)
C
OUT
Tr&Tf= 2.5ms
Line Rejection IL= 100mA
=10mF
=1mF
80
70
60
50
40
C
=10mF
30
20
10
0
Power Supply Rejection (dB)
10 100 1k 10k 100k 1M
OUT
C
OUT
= 2.2mF
C
OUT
Frequency (Hz)
ISSUE 5 - NOVEMBER 2001
All Caps Ceramic
Surface Mount
IL= 50mA
=1mF
10
Hz
1
√
V/
µ
0.1
No Load, C
Noise
No Load, C
0.01
10 100 1k 10k 100k 1M
OUT
OUT
IL= 100mA, C
IL= 100mA, C
=1mF
=10mF
OUT
Frequency (Hz)
5
OUT
=10mF
=1mF
Page 6
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
PIN DESCRIPTION
Pin Name Pin Function
V
IN
G
ND
E
N
N/C No Connection
V
O
CONNECTION DIAGRAMS
Supply Voltage
Ground
Active HIGH Enable input. TTL/CMOS logic compatible.
Connect to V
Regulator Output
or logic high for normal operation
IN
SOT23-5
Package Suffix – E5
1
V
IN
2
G
ND
E
3
N
5
V
4
N/C
Top View
O
SCHEMATIC DIAGRAM
SC70
Package Suffix – H5
1
V
IN
2
G
ND
E
3
N
ZXCLXXX ZXCL1XXXZXCLXXX
5
V
4
N/C
Top View
SC70
Package Suffix –H5
1
N/C
G
E
N
2
3
D
N
O
V
5
4
V
Top View
IN
O
ISSUE 5 - NOVEMBER 2001
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Page 7
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
Input to Output Diode
In common with many other LDO regulators, the ZXCL
device has an inherent diode associated with the
output series pass transistor of each regulator. This
diode has its anode connected to the output and its
cathode to the input. The internal diode is normally
reverse biased, but will conduct if the output is forced
above the input by more than a V
0.6V). Current will then flow from Vout to Vin. For safe
operation, the maximum current in this diode should
be limited to 5mA continuous and 30mA peak. An
external schottky diode may be used to provide
protection when this condition cannot be satisfied.
(approximately
BE
Q1
FMMT717
R1
5.6R
Increased Output current
Any ZXCL series device may be used in conjunction
with an external PNP transistor to boost the output
current capability. In the application circuit shown
below, a FMMT717 device is employed as the external
pass element.This SOT23device can supply up to 2.5A
maximum current subject to the thermal dissipation
limits of the package (625mW). Alternative devices
may be used to supply higher levels of current. Note
that with this arrangement, the dropout voltage will be
increased by the VBE drop of the external device. Also,
care should be taken to protect the pass transistor in
the event of excessive output current.
VOUTVIN
U1
ZXCL SERIES
C3
1uF
Scheme to boost output current to 2A
ISSUE 5 - NOVEMBER 2001
C2
1uF
7
VIN
EN
VO
GND
C1
1uF
Page 8
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
APPLICATIONS INFORMATION
Enable Control
A TTL compatible input is provided to allow the
regulator tobe shut down. A lowvoltage on the Enable
pin puts the device into shutdown mode. In this mode
the regulator circuit is switched off and the quiescent
current reduces to virtually zero (typically less than
10nA). A high voltage on the Enable pin ensures
normal operation.
R
C
The Enable pin can be connected to V
an independent source of up to 10V maximum. (e.g.
CMOS logic) for normal operation. There is no clamp
diode from the Enable pin to V
at any voltage within itsoperating rangeirrespective of
the voltage on the Enable pin.
IN
or driven from
IN
, so the VINpin may be
Current Limit
The ZXCL devices include a current limit circuit which
restricts the maximum output current flow to typically
230mA. Practically the range of over-current should be
considered as minimum 160mA to maximum 800mA.
The device’s robust design means that an output short
circuit toany voltage betweenground and V
tolerated for an indefinite period.
OUT
can be
Thermal Overload
Thermal overload protection isincluded onchip. When
the device junction temperature exceeds a minimum
125°C the device will shut down. The sense circuit will
re-activate the output as the device cools. It will then
cycle until the overload is removed. The thermal
overload protection will be activated when high load
currents or high input to output voltage differentials
cause excess dissipation in the device.
Figure 1 Circuit Connection
T
d
Figure 2 Start up delay (T
T = RCIn
d(NOM)
Calculation of start up delay as above
d
V
IN
−
V1.5
IN
)
Start up delay
A smallamount ofhysteresis is provided on the Enable
pin to ensure clean switching.This feature canbe used
to introduce a start up delay if required. Addition of a
simple RC network on the Enable pin provides this
function. The following diagram illustrates this circuit
connection. The equation provided enablescalculation
of the delay period.
ISSUE 5 - NOVEMBER 2001
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ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
APPLICATIONS INFORMATION (Cont)
Power Dissipation
The maximum allowable power dissipation of the
device fornormal operation(Pmax), is a function of the
package junction to ambient thermal resistance (θja),
maximum junction temperature (Tjmax), and ambient
temperature (Tamb), according to the expression:
P
= (Tj
max
The maximum output current (I
Input voltage (V
max
– T
) / θ
amb
ja
) and output voltage (V
IN
) at a given value of
max
OUT
) is then
given by
= P
I
max
max
/ (VIN- V
OUT
)
The valueof θja is strongly dependent upon the typeof
PC board used. Using the SC70 package it will range
from approximately 280°C/W fora multi-layerboard to
around 450°C/W for a single sided board. It will range
from 180°C/W to 300°C/W for the SOT23-5 package. To
avoid entering the thermal shutdown state, Tj
should be assumed to be 125°C and I
over-current limit,(I
). Power derating for the SC70
OLIM
less than the
max
max
and SOT23-5 packages is shown in the following
graph.
500
400
300
200
100
0
Max Power Dissipation (mW)
-40-200 20406080100
SOT23
SC70
Temperature (°C)
Derating Curve
Capacitor Selection and RegulatorStability
The device is designed to operate with all types of
output capacitor, including tantalum and low ESR
ceramic. For stability over the full operatingrange from
no load to maximum load, an output capacitor with a
minimum value of 1µF is recommended, although this
can be increased without limit to improve load
transient performance. Higher values of output
capacitor will alsoreduce outputnoise. Capacitorswith
ESR less than0.5Ω are recommended for best results.
An input capacitor of 1µF (ceramic or tantalum) is
recommended to filter supply noise at the device input
and will improve ripple rejection.
The input and output capacitors should be positioned
close to the device, and a ground plane board layout
should be usedto minimisethe effects of parasitic track
resistance.
Dropout Voltage
The output pass transistor is a large PMOS device,
which acts like a resistor when the regulator enters the
dropout region. The dropout voltage is therefore
proportional to output current as shown in the typical
characteristics.
Ground Current
The use of a PMOS device ensures a low value of
ground currentunder all conditionsincluding dropout,
start-up and maximum load.
Power Supply Rejection and Load
Transient Response
Line and Load transient response graphs are shown in
the typical characteristics.
These show both the DC and dynamic shift in the
output voltage with step changes of input voltage and
load current, and how this is affected by the output
capacitor.
If improved transient response is required, then an
output capacitor with lower ESR value should be used.
Larger capacitorswill reduce over/undershoot,but will
increase the settling time. Best results are obtained
using a ground plane layout to minimise board
parasitics.
ISSUE 5 - NOVEMBER 2001
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Page 10
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
PACKAGE DIMENSIONS
SC70
DIM
A 1.00
A1 0.10
A2
b 0.15
C 0.08
D 2.00BSC
E 2.10BSC
E1 1.25BSC
e 0.65BSC
e1 1.30BSC
L 0.26 0.46
a° 08
Millimetres
MIN MAX
0.70
SOT23-5
DIM
A 0.90 1.45
A1 0.00 0.15
A2
b 0.35 0.50
C 0.09 0.20
D 2.80
E 2.60 3.00
E1 1.50 1.75
e 0.95 REF
e1 1.90 REF
L 0.10 0.60
a° 010
Millimetres
MIN MAX
0.90
1.3
3.00
ISSUE 5 - NOVEMBER 2001
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ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
ORDERING INFORMATION
DEVICE
Output
Voltage
Package Partmarking
V
ZXCL250H5 2.5 SC70 L25A
ZXCL260H5 2.6 SC70 L26A
ZXCL280H5 2.8 SC70 L28A
ZXCL300H5 3.0 SC70 L30A
ZXCL330H5 3.3 SC70 L33A
ZXCL400H5 4.0 SC70 L40A
ZXCL1250H5 2.5 SC70 L25C
ZXCL1260H5 2.6 SC70 L26C
ZXCL1280H5 2.8 SC70 L28C
ZXCL1300H5 3.0 SC70 L30C
ZXCL1330H5 3.3 SC70 L33C
ZXCL1400H5 4.0 SC70 L40C
ZXCL250E5 2.5 SOT23-5 L25B
ZXCL260E5 2.6 SOT23-5 L26B
ZXCL280E5 2.8 SOT23-5 L28B
ZXCL300E5 3.0 SOT23-5 L30B
ZXCL330E5 3.3 SOT23-5 L33B
ZXCL400E5 4.0 SOT23-5 L40B
© Zetex plc 2001
Zetex plc
Fields New Road
Chadderton
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4422
Fax: (44) 161 622 4420
These offices are supported by agents and distributors in major countries world-wide.
This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or
reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services
concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or
service.
For the latest product information, log on to
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
www.zetex.com
Zetex Inc
700 Veterans Memorial Hwy
Hauppauge, NY11788
USA
Telephone: (631) 360 2222
Fax: (631) 360 8222
Zetex (Asia) Ltd
3701-04 Metroplaza, Tower 1
Hing Fong Road
Kwai Fong, Hong Kong
China
Telephone: (852) 26100 611
Fax: (852) 24250 494
ISSUE 5 - NOVEMBER 2001
11
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