ZXCL330E5 [ZETEX]
ULTRA SMALL MICROPOWER SC70 LOW DROPOUT REGULATORS; 超小型SC70微功耗低压差稳压器
| 型号： | ZXCL330E5 |
| 厂家： | 
ZETEX SEMICONDUCTORS |
| 描述： | ULTRA SMALL MICROPOWER SC70 LOW DROPOUT REGULATORS |
| 文件： | 总11页 (文件大小：376K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
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 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 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.
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.
APPLICATIONS
FEATURES
•
5-pin SC70 package for the ultimate in space
saving
•
•
•
•
•
•
•
Cellular and Cordless phones
Palmtop and laptop computers
PDA
•
•
•
•
5-pin SOT23 industry standard pinout
Low 85mV dropout at 50mA load
Hand held instruments
50µA ground pin current with full 150mA load
Camera, Camcorder, Personal Stereo
PCMCIA cards
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
Portable and Battery-powered equipment
•
•
Thermal overload and over-current protection
-40 to +85°C operating temperature range
TYPICAL APPLICATION CIRCUIT
PACKAGE FOOTPRINT
Total Aea
Output Voltage
Battery Supply
2.1mm x 2mm
=4.2mm2
ZXCL
Total Aea
2.8mm x 2.9mm
=8.12mm2
ISSUE 5 - NOVEMBER 2001
1
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage with respect to GND
VIN
EN
VO
-0.3V to 7.0V
-0.3V to 10V
-0.3V to 5.5V
Output short circuit duration
Continuous Power Dissipation
Operating Temperature Range
Storage Temperature Range
Infinite
Internally limited
-40°C to +85°C
-55°C to +125°C
Package Power Dissipation (TA=25°C)
SC70
SOT23-5
300mW (Note 1)
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
IN = VO + 0.5V, typical values at TA = 25 C V (Unless otherwise stated)
SYMBOL PARAMETER
CONDITIONS
LIMITS
TYP
UNITS
MIN
MAX
VIN
VO
Input Voltage
(note2)
5.5
V
IO = 1mA
ZXCL250
ZXCL260
ZXCL280
ZXCL300
ZXCL330
ZXCL400
Output Voltage
2.450
2.548
2.744
2.940
3.234
3.920
2.5
2.6
2.8
3.0
3.3
4.0
2.550
2.652
2.856
3.060
3.366
4.080
V
IO = 100mA
VO + 0.5V < VIN < VIN max.
ZXCL250
ZXCL260
ZXCL280
ZXCL300
ZXCL330
ZXCL400
2.425
2.522
2.744
2.910
3.201
3.880
2.575
2.678
2.884
3.090
3.399
4.120
V
Output Voltage
Temperature
Coefficient
-15
ppm/°C
∆VO/∆T
IO(MAX)
IOLIM
IQ
150
100
160
105
mA
mA
Output Current
ZXCL250 only
ZXCL250 only
No Load
IO = 150mA,
IO = 100mA,
800
750
230
Over Current Limit
Ground pin current
25
50
40
50
120
100
A
A
A
ISSUE 5 - NOVEMBER 2001
2
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
ELECTRICAL CHARACTERISTICS
V
IN = VO + 0.5V, typical values at TA=25°C (Unless otherwise stated)
SYMBOL PARAMETER
CONDITIONS
LIMITS
TYP
UNITS
MIN
MAX
ZXCL250
IO=10mA
IO=50mA
IO=100mA
ZXCL260
IO=10mA
IO=50mA
IO=100mA
ZXCL280
IO=10mA
IO=50mA
IO=100mA
ZXCL300
IO=10mA
IO=50mA
IO=100mA
ZXCL330
IO=10mA
IO=50mA
IO=100mA
ZXCL400
IO=10mA
IO=50mA
IO=100mA
VDO
Dropout Voltage
Note 3
15
85
163
mV
mV
mV
mV
mV
mV
325
310
280
280
280
15
85
155
15
85
140
15
85
140
15
85
140
15
85
140
280
0.1
⌬VLNR
⌬VLDR
EN
Line Regulation
VIN=(VO+0.5V) to 5.5V, IO=1mA
IO=1mA to 100mA
0.02
0.01
50
%/V
Load Regulation
Output Noise Voltage
0.04
%/mA
µV rms
V
f=10Hz to 100kHz, CO=10µF,
2
2.2
VENH
Enable pin voltage for
normal operation
10
TA = -40°C
VENL
Enable pin voltage for
output shutdown
0
0.8
V
VENHS
IEN
Enable pin hysteresis
150
mV
nA
Enable Pin input
current
VEN=5.5V
VEN=0V
100
1
IQSD
Shutdown supply
current
µA
TSD
Thermal Shutdown
Temperature
125
165
°C
Device testing is performed at TA=25ЊC. 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 VIN exceeds a value or approximately 1.3V. For normal
operation, VIN (min) > VOUT (nom) + 0.5V.
Note 3: Dropout voltage is defined as the difference between VIN and VO, when VO has dropped 100mV below
ISSUE 5 - NOVEMBER 2001
3
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
TYPICAL CHARACTERISTICS (ZXCL280 shown)
6
5
4
3
2
1
0
0.25
0.20
0.15
0.10
0.05
0.00
VIN
IOUT = 100mA
IOUT = 1mA
0
1
2
3
4
5
6
100
5
0
25
50
75
100
125
150
175
Output Current (mA)
Input Voltage (V)
Input to Output Characteristics
Dropout Voltage v Output Current
25.0
24.8
24.6
24.4
24.2
24.0
23.8
23.6
23.4
23.2
23.0
2.81
2.80
2.79
VIN = 3.3V
No Load
VIN = 3.3V
No Load
-50
-25
0
25
50
75
-50
-25
0
25
50
75
100
Temperature (°C)
Output Voltage v Temperature
Temperature (°C)
Ground Current v Temperature
30
25
20
15
10
5
60
No Load
55
50
45
40
35
30
25
20
VIN = 5V
VIN = 3.3V
0
0
1
2
3
4
0
25
50
75
100
125
150
Input Voltage (V)
Ground Current v Input Voltage
Load Current (mA)
Ground Current v Load Current
ISSUE 5 - NOVEMBER 2001
4
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
TYPICAL CHARACTERISTICS (ZXCL280 shown)
6
5
4
3
2
1
0
100
50
0
VIN = 5V
IL = 1mA to 50mA
COUT = 1mF
Enable
VIN = 5V
IL = 1mA
IL = 100mA
100
50
COUT = 1mF
COUT = 10mF
VIN = 3.3V
IL = 1mA
IL = 100mA
0
COUT = 10mF
COUT = 1mF
-50
-100
0
10 20 30 40 50 60 70 80 90 100
0.0
0.1
0.2
0.3
0.4
0.5
0.5
1M
Time (µs)
Time (ms)
Load Response
Start-Up Response
6
5
4
3
6
5
4
3
COUT = 1mF
Tr & Tf = 2.5ms
COUT = 1mF
Tr & Tf = 2.5ms
20
10
0
20
10
0
-10
-20
-10
-20
0.0
0.1
0.2
0.3
0.4
0.5
0.0
0.1
0.2
0.3
0.4
Time (ms)
Line Rejection IL = 1mA
Time (ms)
Line Rejection IL = 100mA
80
10
1
All Caps Ceramic
Surface Mount
IL = 50mA
IL = 100mA, COUT = 1mF
IL = 100mA, COUT = 10mF
70
60
50
40
30
20
10
0
COUT = 10mF
COUT = 2.2mF
0.1
0.01
No Load, COUT = 1mF
No Load, COUT = 10mF
COUT = 1mF
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
Frequency (Hz)
Power Supply Rejection v Frequency
Frequency (Hz)
Output Noise v Frequency
ISSUE 5 - NOVEMBER 2001
5
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
PIN DESCRIPTION
Pin Name
Pin Function
Supply Voltage
Ground
VIN
GND
EN
Active HIGH Enable input. TTL/CMOS logic compatible.
Connect to VIN or logic high for normal operation
N/C
VO
No Connection
Regulator Output
CONNECTION DIAGRAMS
SOT23-5
SC70
SC70
Package Suffix – E5
Package Suffix – H5
Package Suffix –H5
1
2
5
4
V
G
ND
E
N
V
O
1
2
5
4
V
G
ND
E
N
V
O
1
2
5
4
V
IN
E
IN
IN
N
/
NC
3
N/C
3
N/C
G
3
V
O
D
N
Top View
Top View
Top View
ZXCLXXX
ZXCLXXX
ZXCL1XXX
SCHEMATIC DIAGRAM
ISSUE 5 - NOVEMBER 2001
6
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
Input to Output Diode
Increased Output current
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 VBE (approximately
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.
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 SOT23 device 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.
Q1
FMMT717
VIN
VOUT
R1
5.6R
U1
ZXCL SERIES
VIN
EN
VO
C3
1uF
C2
1uF
C1
1uF
Scheme to boost output current to 2A
ISSUE 5 - NOVEMBER 2001
7
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
APPLICATIONS INFORMATION
Enable Control
A TTL compatible input is provided to allow the
regulator to be shut down. A low voltage 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 VIN or driven from
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 VIN, so the VIN pin may be
at any voltage within its operating range irrespective of
the voltage on the Enable pin.
Figure 1 Circuit Connection
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 to any voltage between ground and VOUT can be
tolerated for an indefinite period.
T
d
Figure 2 Start up delay (Td)
Thermal Overload
Thermal overload protection is included on chip. 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.
VIN
IN − 1.5
Td(NOM) = RCIn
V
Calculation of start up delay as above
Start up delay
A small amount of hysteresis is provided on the Enable
pin to ensure clean switching. This feature can be 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 enables calculation
of the delay period.
ISSUE 5 - NOVEMBER 2001
8
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
APPLICATIONS INFORMATION (Cont)
Capacitor Selection and Regulator Stability
The device is designed to operate with all types of
output capacitor, including tantalum and low ESR
ceramic. For stability over the full operating range 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 also reduce output noise. Capacitors with
ESRlessthan0.5Ω arerecommendedforbestresults.
Power Dissipation
The maximum allowable power dissipation of the
device for normal 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
max = (Tjmax – Tamb) / θja
An input capacitor of 1µF (ceramic or tantalum) is
recommended to filter supply noise at the device input
and will improve ripple rejection.
The maximum output current (Imax) at a given value of
Input voltage (VIN) and output voltage (VOUT) is then
given by
The input and output capacitors should be positioned
close to the device, and a ground plane board layout
should be used to minimise the effects of parasitic track
resistance.
Imax = Pmax / (VIN - VOUT
)
The value of θja is strongly dependent upon the type of
PC board used. Using the SC70 package it will range
from approximately 280 °C/W for a multi-layer board 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, Tjmax
should be assumed to be 125°C and Imax less than the
over-current limit,(IOLIM). Power derating for the SC70
and SOT23-5 packages is shown in the following
graph.
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 current under all conditions including dropout,
start-up and maximum load.
500
400
Power Supply Rejection and Load
Transient Response
SOT23
300
Line and Load transient response graphs are shown in
the typical characteristics.
200
SC70
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.
100
0
-40
-20
0
20
40
60
80
100
If improved transient response is required, then an
output capacitor with lower ESR value should be used.
Larger capacitors will reduce over/undershoot, but will
increase the settling time. Best results are obtained
using a ground plane layout to minimise board
parasitics.
Temperature (°C)
Derating Curve
ISSUE 5 - NOVEMBER 2001
9
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
PACKAGE DIMENSIONS
SOT23-5
SC70
DIM
Millimetres
DIM
Millimetres
MIN
0.90
0.00
0.90
MAX
MIN
MAX
A
1.45
0.15
1.3
A
1.00
0.10
A1
A2
A1
A2
0.70
b
C
D
0.35
0.09
2.80
0.50
0.20
3.00
b
0.15
C
0.08
D
E
2.00BSC
2.10BSC
1.25BSC
0.65BSC
1.30BSC
0.26
E
2.60
3.00
1.75
E1
e
E1
e
1.50
0.95 REF
1.90 REF
0.10
e1
L
e1
L
0.46
8
0.60
10
a°
0
a°
0
ISSUE 5 - NOVEMBER 2001
10
ZXCL250 ZXCL260 ZXCL280
ZXCL300 ZXCL330 ZXCL400
ORDERING INFORMATION
Output Package
Voltage
V
Partmarking
DEVICE
ZXCL250H5
ZXCL260H5
ZXCL280H5
ZXCL300H5
ZXCL330H5
ZXCL400H5
ZXCL1250H5
ZXCL1260H5
ZXCL1280H5
ZXCL1300H5
ZXCL1330H5
ZXCL1400H5
ZXCL250E5
ZXCL260E5
ZXCL280E5
ZXCL300E5
ZXCL330E5
ZXCL400E5
2.5
2.6
2.8
3.0
3.3
4.0
2.5
2.6
2.8
3.0
3.3
4.0
2.5
2.6
2.8
3.0
3.3
4.0
SC70
L25A
L26A
L28A
L30A
L33A
L40A
L25C
L26C
L28C
L30C
L33C
L40C
L25B
L26B
L28B
L30B
L33B
L40B
SC70
SC70
SC70
SC70
SC70
SC70
SC70
SC70
SC70
SC70
SC70
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
© Zetex plc 2001
Zetex plc
Fields New Road
Chadderton
Zetex GmbH
Zetex Inc
700 Veterans Memorial Hwy
Hauppauge, NY11788
Zetex (Asia) Ltd
3701-04 Metroplaza, Tower 1
Hing Fong Road
Streitfeldstraße 19
D-81673 München
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4422
Fax: (44) 161 622 4420
Kwai Fong, Hong Kong
China
Telephone: (852) 26100 611
Fax: (852) 24250 494
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
USA
Telephone: (631) 360 2222
Fax: (631) 360 8222
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 www.zetex.com
ISSUE 5 - NOVEMBER 2001
11
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