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ZXCL200
ULTRA SMALL MICROPOWER SC70 2V 100mA REGULATOR
DESCRIPTION
The ZXCL200 is a very small 2 volt regulator designed for use in low power and severely space limited applications. Supply current is minimised with a ground pin current of only 40A at full 100mA load. Logic control allows the device to be shut down, consuming typically less than 10nA. These features make it ideal for battery powered applications where power economy is critical. The part has been designed with space sensitive systems in mind. It is 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 ZXCL200 is also offered in the 5 pin SOT23 package with an industry standard pinout. The device features thermal overload and over-current protection. T h e Z X C L 2 0 0 i s m a n u f a ct u r e d u si n g C M O S processing, however advanced design techniques mean that output noise is improved even when compared to other bipolar devices.
FEATURES
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 equipmenth
* 5-pin SOT23 industry standard pinout * 40A ground pin current with full 100mA load * Typically less than 10nA ground pin current on
shutdown
* 2 volt output * Very low noise, without bypass capacitor * Thermal overload and over-current protection * -40 to +85C operating temperature range
PACKAGE FOOTPRINT
TYPICAL APPLICATION CIRCUIT
Total Aea 2.1mm x 2mm =4.2mm2
Battery Supply
Output Voltage
ZXCL
Total Aea 2.8mm x 2.9mm =8.12mm2
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ZXCL200
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=25C) 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 VIN = VO + 0.5V, typical values at TA=25C (Unless otherwise stated)
SYMBOL PARAMETER CONDITIONS
MIN V IN VO Input Voltage Output Voltage (Note 3) V O /T Output Voltage Temperature Coefficient Output Current Over Current Limit Ground pin current Line Regulation Load Regulation Output Noise Voltage Enable pin voltage for normal operation Enable pin voltage for output shutdown No Load IO = 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 0 100 105 25 40 0.02 0.01 50 10 0.8 750 50 100 0.1 0.04 T A =-40 C I O = 1mA I O = 100mA V O +0.5V < V IN < V IN max -15 ppm/C (note2) 1.96 1.94 2
LIMITS
TYP MAX 5.5 2.04 2.06
UNITS
V V V
I O(MAX) I OLIM IQ V LNR V LDR EN V ENH V ENL
mA mA A A %/V %/mA V rms V V
Device testing is performed at T A =25 C. Device thermal performance is guaranteed by design. Note 1: 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 IN exceeds a value or approximately 1.3V. For normal operation, V IN (min) > V OUT (nom) + 0.5V. Note 3: Nominal value of V O is defined at V IN =V O +0.5V.
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ZXCL200
TYPICAL CHARACTERISTICS
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ZXCL200
TYPICAL CHARACTERISTICS
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ZXCL200
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 GND N/C
1 2 3
5
VIN VO
4
4
Top View ZXCLXXX ZXCLXXX
Top View ZXCL1XXX
Top View
SCHEMATIC DIAGRAM
ISSUE 1 - SEPTEMBER 2001 5
ZXCL200
Input to Output Diode
In common with many other regulators, the ZXCL200 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.
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 1 - SEPTEMBER 2001 6
ZXCL200
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.
R
C
Figure 1 Circuit Connection
Current Limit
The ZXCL200 device includes a current limit circuit which restricts the maximum output current flow to typically 200mA. Practically the range of over-current should be considered as minimum 105mA to maximum 750mA. 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.
VIN Td(NOM) = RCIn V - 1.5 IN
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.
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ZXCL200
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.
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.
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 capacitors will reduce over/undershoot, but will increase the settling time. Best results are obtained using a ground plane layout to minimise board parasitics.
Max Power Dissipation (mW)
500 400
SOT23
300 200
SC70
100 0 -40
-20
0
20
40
60
80
100
Temperature (C)
Derating Curve
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ZXCL200
PACKAGE DIMENSIONS
DIM
SOT23-5
Millimetres
MIN A A1 A2 b C D E E1 e e1 L a 0.90 0.00 MAX 1.45 0.15 1.3 0.50 0.20
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
0.60 10
SC70
DIM
Millimetres
MIN MAX 1.00 0.10
ORDERING INFORMATION
A
DEVICE
Output Package Voltage V
2.0 2.0 2.0 SC70 SC70 SOT23-5
Partmarking
A1 A2
0.70
0.15 0.08 2.00BSC 2.10BSC 1.25BSC 0.65BSC 1.30BSC 0.26 0 0.46 8
ZXCL200H5 ZXCL1200H5 ZXCL200E5
L20A L20C L20B
b C D E E1 e e1 L a
(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 Suite 315 700 Veterans Memorial Highway 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 1 - SEPTEMBER 2001 9

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