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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 50A 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. FEATURES 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.
APPLICATIONS
* 5-pin SC70 package for the ultimate in space
saving
* Cellular and Cordless phones * Palmtop and laptop computers * PDA * Hand held instruments * Camera, Camcorder, Personal Stereo * PCMCIA cards * Portable and Battery-powered equipment
* 5-pin SOT23 industry standard pinout * Low 85mV dropout at 50mA load * 50A 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 +85C operating temperature range
PACKAGE FOOTPRINT Total Aea 2.1mm x 2mm =4.2mm2
TYPICAL APPLICATION CIRCUIT
Battery Supply
Output Voltage
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 -0.3V to 7.0V EN -0.3V to 10V VO -0.3V to 5.5V Package Power Dissipation (TA=25C) SC70 SOT23-5 300mW (Note 1) 450mW (Note 1) Output short circuit duration Continuous Power Dissipation Operating Temperature Range Storage Temperature Range Infinite Internally limited -40C to +85C -55C to +125C
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 VIN = VO + 0.5V, typical values at TA = 25 C V (Unless otherwise stated)
SYMBOL PARAMETER CONDITIONS
MIN V IN VO Input Voltage Output Voltage I O = 1mA ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 I O = 100mA V O + 0.5V < V IN < V IN max. ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 (note2) 2.450 2.548 2.744 2.940 3.234 3.920 2.5 2.6 2.8 3.0 3.3 4.0
LIMITS
TYP MAX 5.5 2.550 2.652 2.856 3.060 3.366 4.080
UNITS
V
V
2.425 2.522 2.744 2.910 3.201 3.880 -15
2.575 2.678 2.884 3.090 3.399 4.120
V
V O /T
Output Voltage Temperature Coefficient Output Current Over Current Limit Ground pin current ZXCL250 only ZXCL250 only No Load IO = 150mA, I O = 100mA, 150 100 160 105
ppm/C
I O(MAX) I OLIM IQ
mA 230 25 50 40 800 750 50 120 100 mA A A A
ISSUE 5 - NOVEMBER 2001 2
ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400
ELECTRICAL CHARACTERISTICS VIN = VO + 0.5V, typical values at TA=25C (Unless otherwise stated)
SYMBOL PARAMETER CONDITIONS
MIN V DO Dropout Voltage Note 3 ZXCL250 I O =10mA I O =50mA I O =100mA ZXCL260 I O =10mA I O =50mA I O =100mA ZXCL280 I O =10mA I O =50mA I O =100mA ZXCL300 I O =10mA I O =50mA I O =100mA ZXCL330 I O =10mA I O =50mA I O =100mA ZXCL400 I O =10mA I O =50mA I O =100mA VIN=(VO+0.5V) to 5.5V, IO=1mA IO=1mA to 100mA f=10Hz to 100kHz, C O =10F, T A = -40C 2 2.2 0 150 V EN =5.5V V EN =0V 125 100 1 165
LIMITS
TYP MAX
UNITS
15 85 163 15 85 155 15 85 140 15 85 140 15 85 140 15 85 140 0.02 0.01 50
mV 325
mV 310
mV 280
mV 280
mV 280
mV 280 0.1 0.04 %/V %/mA V rms 10 0.8 V V mV nA A C
V LNR V LDR EN V ENH V ENL V ENHS I EN I QSD T SD
Line Regulation Load Regulation Output Noise Voltage Enable pin voltage for normal operation Enable pin voltage for output shutdown Enable pin hysteresis Enable Pin input current Shutdown supply current Thermal Shutdown Temperature
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 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 0.25
Dropout Voltage (V)
5 6
0.20 0.15 0.10 0.05 0.00
Voltage (V)
4
VIN
3 2
IOUT = 100mA
1
IOUT = 1mA
0 0 1 2 3 4
0
25
50
75
100
125
150
175
Input Voltage (V)
Output Current (mA)
Input to Output Characteristics
2.81 25.0
Dropout Voltage v Output Current
Ground Current (A)
Output Voltage (V)
VIN = 3.3V No Load
24.8 24.6 24.4 24.2 24.0 23.8 23.6 23.4 23.2 23.0 -50
VIN = 3.3V No Load
2.80
2.79 -50
-25
0
25
50
75
100
-25
0
25
50
75
100
Temperature (C)
Temperature (C)
Output Voltage v Temperature
30 60
Ground Current v Temperature
Ground Current (A)
25 20 15 10 5 0 0 1 2 3 4 5
Ground Current (A)
No Load
55 50 45 40 35 30 25 20 0 25 50 75 100 125 150
VIN = 5V VIN = 3.3V
Input Voltage (V)
Load Current (mA)
Ground Current v Input Voltage
Ground Current v Load Current
ISSUE 5 - NOVEMBER 2001 4
ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400
TYPICAL CHARACTERISTICS (ZXCL280 shown)
6 5
Enable VIN = 5V IL = 1mA IL = 100mA VIN = 3.3V IL = 1mA IL = 100mA
100
IL(mA)
COUT = 1m F
50 0 100
VIN = 5V IL = 1mA to 50mA
Voltage (V)
4 3 2 1 0 0 10 20 30 40 50
DVOUT (mV)
50 0 -50 -100 0.0 0.1
COUT = 10m F COUT = 1m F
COUT = 1m F COUT = 10m F
60
70
80
90 100
0.2
0.3
0.4
0.5
Time (s)
Time (ms)
Start-Up Response
6 6
Load Response
VIN (V)
4 3
VIN (V)
5
COUT = 1m F Tr & Tf = 2.5m s
5 4 3
COUT = 1m F Tr & Tf = 2.5m s
DVOUT (mV)
20 10 0 -10 -20 0.0 0.1 0.2 0.3 0.4 0.5
DVOUT (mV)
20 10 0 -10 -20 0.0 0.1 0.2 0.3 0.4 0.5
Time (ms)
Time (ms)
Line Rejection IL = 1mA
Power Supply Rejection (dB)
80 70 60 50 40 30 20 10 0 10 100 1k
COUT = 10m F COUT = 2.2m F COUT = 1m F All Caps Ceramic Surface Mount IL = 50mA
Line Rejection IL = 100mA
10
IL = 100mA, COUT = 1m F
Noise V/ Hz
IL = 100mA, COUT = 10m F
1
0.1
No Load, COUT = 1m F No Load, COUT = 10m F
10k
100k
1M
0.01 10
100
1k
10k
100k
1M
Frequency (Hz)
Frequency (Hz)
Power Supply Rejection v Frequency
Output Noise v Frequency
ISSUE 5 - NOVEMBER 2001 5
ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400
PIN DESCRIPTION
Pin Name V IN G ND EN N/C VO Pin Function Supply Voltage Ground Active HIGH Enable input. TTL/CMOS logic compatible. Connect to V IN or logic high for normal operation No Connection Regulator Output
CONNECTION DIAGRAMS
SOT23-5 Package Suffix - E5 SC70 Package Suffix - H5
SC70 Package Suffix -H5
VIN GND EN
1 2 3
5
VO
N/C
4
VIN GND EN
1 2 3
5
VO
N/C
EN
N/C GND
1 2 3
5
VIN VO
4
4
Top View
ZXCLXXX ZXCLXXX
Top View
ZXCL1XXX
Top View
SCHEMATIC DIAGRAM
ISSUE 5 - NOVEMBER 2001 6
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 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.
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 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 VIN
FMMT717
VOUT U1
ZXCL SERIES VIN EN GND VO
R1
5.6R
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. 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
R
C
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.
Td
Figure 2 Start up delay (Td)
Thermal Overload
Thermal overload protection is included on chip. When the device junction temperature exceeds a minimum 125C 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.
Calculation of start up delay as above VIN Td(NOM) = RCIn VIN - 1.5
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) 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 (ja), maximum junction temperature (Tjmax), and ambient temperature (Tamb), according to the expression: Pmax = (Tjmax - Tamb) / ja The maximum output current (Imax) at a given value of Input voltage (VIN) and output voltage (VOUT) is then given by Imax = Pmax / (VIN - VOUT ) The value of ja 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 450C/W for a single sided board. It will range from 180C/W to 300C/W for the SOT23-5 package. To avoid entering the thermal shutdown state, Tjmax should be assumed to be 125C and Imax less than the over-current limit,(IOLIM). Power derating for the SC70 and SOT23-5 packages is shown in the following graph.
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 1F 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 ESR less than 0.5 are recommended for best results. An input capacitor of 1F (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 used to minimise the 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 current under all conditions including dropout, start-up and maximum load.
Max Power Dissipation (mW)
500 400
SOT23
300 200
SC70
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.
100 0 -40
-20
0
20
40
60
80
100
Temperature (C)
Derating Curve
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.
ISSUE 5 - NOVEMBER 2001 9
ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400
PACKAGE DIMENSIONS
SC70
DIM
SOT23-5
DIM
Millimetres
MIN MAX 1.00 0.10
Millimetres
MIN MAX 1.45 0.15 1.3 0.50 0.20
A A1 A2 b C D E E1 e e1 L a
A A1 A2 b C D E E1 e e1
0.90 0.00
0.70
0.15 0.08 2.00BSC 2.10BSC 1.25BSC 0.65BSC 1.30BSC 0.26 0 0.46 8
0.90
0.35 0.09 2.80 2.60 1.50 0.95 REF 1.90 REF 0.10 0
3.00
3.00 1.75
L a
0.60 10
ISSUE 5 - NOVEMBER 2001 10
ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400
ORDERING INFORMATION
DEVICE Output Package Voltage V
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 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5
Partmarking
ZXCL250H5 ZXCL260H5 ZXCL280H5 ZXCL300H5 ZXCL330H5 ZXCL400H5 ZXCL1250H5 ZXCL1260H5 ZXCL1280H5 ZXCL1300H5 ZXCL1330H5 ZXCL1400H5 ZXCL250E5 ZXCL260E5 ZXCL280E5 ZXCL300E5 ZXCL330E5 ZXCL400E5
L25A L26A L28A L30A L33A L40A L25C L26C L28C L30C L33C L40C L25B L26B L28B L30B L33B L40B
(c) Zetex plc 2001
Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 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
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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