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ZXCL Series
MICROPOWER SC70-5 & SOT23-5 LOW DROPOUT REGULATORS
ZXCL5213V25, ZXCL5213V26, ZXCL5213V28, ZXCL5213V30, ZXCL5213V33, ZXCL5213V40 ZXCL250, ZXCL260, ZXCL280, ZXCL300, ZXCL330, ZXCL400 DESCRIPTION
The ZXCL series have been designed with space sensitive systems in mind. They are available in the ultra small SC70-5 package, which is half the size of other SOT23 based regulators. The devices can be used with all types of output capacitors including low ESR ceramics and typical dropout voltage, is only 85mV at 50mA load. Supply current is minimised with a ground pin current of only 50 A 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. 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
APPLICATIONS
* Cellular and Cordless phones * Palmtop and laptop computers * PDA * Hand held instruments * Camera, Camcorder, Personal Stereo * PCMCIA cards * Portable and Battery-powered equipment
No-Load Stability, the ZXCL device will maintain regulation and is stable with no external load. e.g. CMOS RAM applacations.
* 5-pin SOT23 industry standard pinout * Can be used with all types of output capacitor * Low 85mV dropout at 50mA load * 50 A 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 * No-load stable
TYPICAL APPLICATION CIRCUIT
PACKAGE FOOTPRINT
ISSUE 7 - AUGUST 2002 1
ZXCL Series
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 -40C to +85C -55C to +125C
Package Power Dissipation (TA=25C) SC70-5 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 VIN = VO + 0.5V, all values at TA = 25 C (Unless otherwise stated)
SYMBOL
V IN VO
PARAMETER
Input Voltage Output Voltage
CONDITIONS
MIN (note2) I O = 1mA ZXCL250 / 5213V25 ZXCL260 / 5213V26 ZXCL280 / 5213V28 ZXCL300 / 5213V30 ZXCL330 / 5213V33 ZXCL400 / 5213V40 I O = 100mA V O + 0.5V < V IN < V IN max. ZXCL250 / 5213V25 ZXCL260 / 5213V26 ZXCL280 / 5213V28 ZXCL300 / 5213V30 ZXCL330 / 5213V33 ZXCL400 / 5213V40 2.450 2.548 2.744 2.940 3.234 3.920 2.425 2.522 2.744 2.910 3.201 3.880
LIMITS TYP MAX 5.5 2.5 2.6 2.8 3.0 3.3 4.0 2.550 2.652 2.856 3.060 3.366 4.080 2.575 2.678 2.884 3.090 3.399 4.120 -15
UNITS
V
V
V ppm/C
V O /T
Output Voltage Temperature Coefficient Output Current Over Current Limit Ground pin current ZXCL250 / 5213V25 only ZXCL250 / 5213V25 only No Load IO = 150mA, IO = 100mA, 150 100 160 105
I O(MAX) I OLIM IQ
mA 230 25 50 40 800 750 50 120 100 mA A A A
ISSUE 7 - AUGUST 2002 2
ZXCL Series
ELECTRICAL CHARACTERISTICS VIN = VO + 0.5V, all values at TA = 25 C (Unless otherwise stated)
SYMBOL V DO PARAMETER Dropout Voltage Note 3 CONDITIONS MIN ZXCL250 / 5213v25 I O =10mA I O =50mA I O =100mA ZXCL260 / 5213v26 I O =10mA I O =50mA I O =100mA ZXCL280 / 5213v28 I O =10mA I O =50mA I O =100mA ZXCL300 / 5213v30 I O =10mA I O =50mA I O =100mA ZXCL330 / 5213v33 I O =10mA I O =50mA I O =100mA ZXCL400 / 5213v40 I O =10mA I O =50mA I O =100mA 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 V EN =5.5V V EN =0V 125 VIN=(VO+0.5V) to 5.5V, IO=1mA IO=1mA to 100mA f=10Hz to 100kHz, C O =10F, 2 T A = -40C 2.2 0 150 100 1 165 15 85 163 15 85 155 15 85 140 15 85 140 15 85 140 15 85 140 0.02 0.01 50 10 0.8 mV 325 mV 310 LIMITS TYP MAX UNITS
mV 280
mV 280
mV 280
mV 280 0.1 0.04 %/V %/mA V rms V V mV nA A 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 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 its nominal value. Nominal value of VO is defined at VIN=VO+0.5V.
ISSUE 7 - AUGUST 2002 3
ZXCL Series
TYPICAL CHARACTERISTICS (ZXCL280 / 5213 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 7 - AUGUST 2002 4
ZXCL Series
TYPICAL CHARACTERISTICS
6 5
400 100
IL(mA)
COUT = 1F
Enable VIN = 5V IL = 1mA IL = 100mA VIN = 3.3V IL = 1mA IL = 100mA
350 50 300 0 100
VIN = 5V IL = 1mA to 50mA
Voltage (V)
4 3 2 1 0 0
VOUT (mV)
50 0 -50 -100 0.0 0.1
COUT = 10F COUT = 1F
COUT = 1F COUT = 10F
10 20 30 40 50 60 70 80 90 100
0.2
0.3
0.4
0.5
Time (s)
Time (ms)
Start-Up Response
6
COUT = 1F Tr & Tf = 2.5s
Load Response
6
COUT = 1F Tr & Tf = 2.5s
4 3
VIN (V) VOUT (mV)
0.5
VIN(V)
5
5 4 3 1 20 0 10 -1 0 -2 -10 -3 -20 -4 0.0
VOUT (mV)
1 20 0 10 -1 0 -2 -10 -3 -20 -4 0.0
0.1
0.2
0.3
0.4
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 = 10F COUT = 2.2F COUT = 1F All Caps Ceramic Surface Mount IL = 50mA
Line Rejection IL = 100mA
10
IL = 100mA, COUT = 1F IL = 100mA, COUT = 10F
Noise V/Hz
1
0.1
No Load, COUT = 1F No Load, COUT = 10F
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 7 - AUGUST 2002 5
ZXCL Series
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 SC70-5 Package Suffix - H5 SC70-5 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
1 2 3
5
V IN
4
GND
4
VO
Top View ZXCLxxx ZXCLxxx
Top View ZXCL5213Vxx
Top View
SCHEMATIC DIAGRAM
ISSUE 7 - AUGUST 2002 6
ZXCL Series
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. 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.
Scheme to boost output current to 2A
ISSUE 7 - AUGUST 2002 7
ZXCL Series
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) for input voltages above the minimum operating threshold of the device. 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. However input voltage rise time should be kept below 5ms to ensure consistent start-up response. 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. 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. 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.
R
C
Figure 1 Circuit Connection
Td
Figure 2 Start up delay (Td)
VIN Td(NOM) = RCIn VIN - 1.5 Calculation of start up delay as above
ISSUE 7 - AUGUST 2002 8
ZXCL Series
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. The dielectric of the ceramic capacitance is an important consideration for the ZXCL Series operation over temperature. Zetex recommends minimum dielectric specification of X7R for the input and output capacitors. For example a ceramic capacitor with X7R dielectric will lose 20% of its capacitance over a -40 C to 85 C temperature range, whereas a capacitor with a Y5V dielectric loses 80% of its capacitance at -40 C and 75% at 85 C. An input capacitor of 1 F (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
Max Power Dissipation (mW)
500 400
SOT23
The use of a PMOS device ensures a low value of ground current under all conditions including 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.
-20 0 20 40 60 80 100
300 200
SC70
100 0 -40
Temperature (C)
Derating Curve
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 1 F 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.
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 7 - AUGUST 2002 9
ZXCL Series
S70-5 PACKAGE OUTLINE SC70-5 PACKAGE DIMENSIONS
DIM A A1 A2 b C D E E1 e e1 L a MILLIMETRES MIN MAX 1.00 0.10 0.70 0.90 0.15 0.30 0.08 0.25 2.0 BSC 2.10 BSC 1.25 BSC 0.65 BSC 1.30 BSC 0.26 0.46 0 8 INCHES MIN MAX 0.0393 0.0039 0.0275 0.0354 0.006 0.0118 0.0031 0.0098 0.0787 BSC 0.0826 BSC 0.0492 BSC 0.0255 BSC 0.0511 BSC 0.0102 0.0181 0 8
CONTROLLING DIMENSIONS IN MILLIMETRES APPROX CONVERTED DIMENSIONS IN INCHES
SOT23-5 PACKAGE DIMENSIONS
MILLIMETRES DIM INCHES MIN 0.0354 0.00 0.0354 0.0078 0.0035 0.1062 0.0866 0.0511 MAX 0.0570 0.0059 0.0511 0.0196 0.0102 0.1220 0.1181 0.0708
SOT23-5 PACKAGE INFORMATION
A A1 A2 b C D E E1 e e1 L a
MIN 0.90 0.00 0.90 0.20 0.09 2.70 2.20 1.30
MAX 1.45 0.15 1.3 0.50 0.26 3.10 3.20 1.80
0.95 REF 1.90 REF 0.10 0 0.60 30
0.0374 REF 0.0748 REF 0.0039 0 0.0236 30
CONTROLLING DIMENSIONS IN MILLIMETRES APPROX CONVERTED DIMENSIONS IN INCHES
ISSUE 7 - AUGUST 2002 10
ZXCL Series
ORDERING INFORMATION
Device
ZXCL250H5 ZXCL260H5 ZXCL280H5 ZXCL300H5 ZXCL330H5 ZXCL400H5 ZXCL5213V25H5 ZXCL5213V26H5 ZXCL5213V28H5 ZXCL5213V30H5 ZXCL5213V33H5 ZXCL5213V40H5 ZXCL250E5 ZXCL260E5 ZXCL280E5 ZXCL300E5 ZXCL330E5 ZXCL400E5 Output 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 Package Partmarking
SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SC70 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5
L25A L26A L28A L30A L33A L40A L25C L26C L28C L30C L33C L40C L25B L26B L28B L30B L33B L40B
(c) Zetex plc 2002
Europe Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 uk.sales@zetex.com Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY11788 USA Telephone: (631) 360 2222 Fax: (631) 360 8222 usa.sales@zetex.com Asia Pacific Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com
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 7 - AUGUST 2002 11

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