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| DATA SHEET BIPOLAR ANALOG INTEGRATED CIRCUIT PC1945 ADJUSTABLE PRECISION SHUNT REGULATORS DESCRIPTION The PC1945 is an adjustable-shunt regulator featuring a high-precision internal reference voltage. The separate power supply pin (VCC pin) allows the cathode voltage to be dropped to as low as 0.4V, making this product ideal for error amplifiers that use a low voltage (minimum 1.8 V) output switching regulator. Support for high-density mounting is also provided through the use of a 5-pin plastic mini-mold package. FEATURES * Separate cathode and power supply pins * Suitable for low voltage (minimum 1.8 V) output switching regulator Cathode voltage range: 0.4 V to 5 V Power supply voltage range: VREF to 5 V Reference voltage: 1.26 V * 5-pin plastic mini-mold package Mold dimensions: 2.9 mm(L)x1.5 mm(W)x1.1 mm(H) ORDERING INFORMATION Part Number Package 5-pin plastic mini-mold (SC-74A) Marking K95 Form of Shipment - PC1945TA PC1945TA-E1 5-pin plastic mini-mold (SC-74A) K95 * Embossed taping * Pin 1 in wind-in direction * 3000 units/reel PC1945TA-E2 5-pin plastic mini-mold (SC-74A) K95 * Embossed taping * Pin 1 in pull-out direction * 3000 units/reel The information in this document is subject to change without notice. Before using this document, please confirm that this is the latest version. Not all devices/types available in every country. Please check with local NEC representative for availability and additional information. Document No. G14875EJ2V0DS00 (2nd edition) Date Published September 2001 NS CP (K) Printed in Japan 2001 PC1945 PIN CONNECTION (Top View) 5-pin plastic mini-mold (SC-74A) PC1945TA VCC 5 A 4 1 REF 2 A 3 K Pin No 1 2 3 4 5 Pin Symbol REF A K A VCC Reference Anode Cathode Anode Pin Name Supply Voltage Caution It is recommended to connect pins 2 and 4 externally. If this is not possible, leave pin 2 open. BLOCK DIAGRAM VCC K REF A 2 Data Sheet G14875EJ2V0DS PC1945 STANDARD CONNECTION R0 VIN R1 VCC REF R2 GND A K CKA Note VOUT VOUT 1 + R1 R2 x VREF Note CKA = 100 pF minimum. Connect to prevent oscillation. Caution Supply K (Cathode) and VCC from the same power supply. Remark The PC1945 is represented by the following symbol in this data sheet. VCC REF K A APPLICATION CIRCUIT EXAMPLE VO+ photocoupler Input to control IC VCC REF A VO- K CKA Data Sheet G14875EJ2V0DS 3 PC1945 ABSOLUTE MAXIMUM RATINGS (Unless otherwise specified, TA = 25C) Parameter Supply Voltage Cathode Voltage Cathode Current Cathode/Anode Reverse Current Reference Current Reference/Anode Reverse Current Circuit Current Total Power Dissipation Operating Ambient Temperature Operating Junction Temperature Symbol VCC VK IK -IK IREF -IREF ICC PT TA TJ Ratings 6 VCC 15 -5 50 -5 2 90 -20 to+85 -20 to+125 Unit V V mA mA A mA mA mW C C Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any parameter. That is, the absolute maximum ratings are rated values at which the product is on the verge of suffering physical damage, and therefore the product must be used under conditions that ensure that the absolute maximum ratings are not exceeded. RECOMMENDED OPERATING CONDITIONS Parameter Supply Voltage Cathode Voltage Cathode Current Total Power Dissipation Operating Ambient Temperature Operating Junction Temperature VCC VK IK PT TA TJ -20 -20 Symbol MIN. VREF 0.4 TYP. MAX. 5 VCC Note Unit V V mA mW C C 12 20 +85 +100 Note VK VCC Caution The recommended operating range may be exceeded without causing any problems provided that the absolute maximum ratings are not exceeded. However, if the device is operated in a way that exceeds the recommended operating conditions, the margin between the actual conditions of use and the absolute maximum ratings is small, and therefore thorough evaluation is necessary. The recommended operating conditions do not imply that the device can be used with all values at their maximum values. 4 Data Sheet G14875EJ2V0DS PC1945 ELECTRICAL SPECIFICATIONS (Unless otherwise specified, TA = 25C, IK = 2 mA ( including ICC ), VREF = VCC = VK, CKA = 100 pF) Parameter Reference Voltage Reference Voltage Deviation Over Temperature Reference Voltage Deviation Over Supply Voltage Reference Input Current Reference Input Current Deviation Over Temperature Minimum Circuit Current Minimum Cathode Voltage Off-state Cathode Current Dynamic Impedance Unity Gain Bandwidth ICC MIN. VK MIN. IK OFF | ZKA | funity IREF | IREF | | VREF / VCC | VREF | VREF | 0C TA +70C VREF VK 5 V R1 = 10 k, R2 = 0C TA +70C 2 0.3 110 60 0.01 0.3 500 Symbol Conditions MIN. 1.235 TYP. 1.26 5 MAX. 1.285 30 Unit V mV 1.5 4 1.2 400 400 1 0.7 mV/V A A A mV VREF = -2% IK : ICC = 10 : 1 VCC = VK = 6 V, VREF = 0 V f = 1 kHz, 2 mA IK 12 mA R1 = R2 = 10 k A kHz Data Sheet G14875EJ2V0DS 5 PC1945 TYPICAL CHRACTERISTICS (Unless otherwise specified, TA = 25C Reference Values ) PT vs TA VREF - Reference Voltage Deviation - mV 100 30 IK = 2 mA VREF = VCC = VK CKA = 100 pF VREF vs TA PT - Total Power Dissipation - mW 80 695C/W 60 20 10 0 -10 -20 -30 -25 40 20 0 25 50 75 100 125 0 25 50 75 100 125 TA - Operating Ambient Temperature - C TA - Operating Ambient Temperature - C IK vs VK ( I ) 1.0 VREF = VCC = VK CKA = 100 pF 16 14 VREF = VCC = VK CKA = 100 pF IK vs VK (II) IK - Cathode Current - mA IK - Cathode Current - mA 0.8 12 10 8 6 4 2 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 VK - Cathode Voltage - V VK - Cathode Voltage - V IK vs VK (III) 0 4.0 IREF vs TA IREF - Reference Input Current - A IK = 2 mA VREF = VCC = VK CKA = 100 pF R1 = 10 k, R2 = IK - Cathode Current - mA -1 3.0 -2 2.0 -3 -4 VREF = VCC = VK CKA = 100 pF 0 1.0 -5 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 -25 VK - Cathode Voltage - V TA - Operating Ambient Temperature - C 0 25 50 75 100 125 6 Data Sheet G14875EJ2V0DS PC1945 Av, vs f 60 0 | ZKA | vs f 50 TA = 25 C VK = VCC = VREF IK = 2mA Av - Voltage Gain - dB 40 Av -50 | ZKA | - Dynamic Impedance - 10 20 -100 - Phase - 1.0 2.2 k 0 IK o in 10 k 10 k -150 100 pF (IK = 2 mA) -20 1 10 100 1000 f - Frequency - kHz -200 10000 0.1 0.1 1 10 100 f - Frequency - kHz 1000 Stability Area 1.6 IK - Cathode Current - mA a,b,c a: VK = VCC = VREF b: VK = VCC = 3 V c: VK = VCC = 5 V Test Circuit a: 1.4 1.2 1 2.2 k IK CKA Unstable 0.8 0.6 0.4 0.2 0 1 10 Stable a Unstable b Unstable Stable b, c: 2.2 k IK R CKA 10 k 100 1000 10000 100000 CKA - Lode Capacitance - pF CKA: Monolithic Ceramic Capacitor Caution of Stability Area When using plural different types of capacitors, each capacitor is needed to be stable independently. Data Sheet G14875EJ2V0DS 7 PC1945 PACKAGE DRAWING 5 PIN PLASTIC MINI MOLD (Unit: mm) detail of lead end F G R E A H B I J L S C D M M N K S ITEM A B C D E F G H I J K L M N R MILLIMETERS 2.90.2 0.3 0.95 (T.P.) 0.32 +0.05 -0.02 0.050.05 1.4 MAX. 1.1+0.2 -0.1 2.80.2 1.5+0.2 -0.1 0.65 +0.1 -0.15 0.16 +0.1 -0.06 0.40.2 0.19 0.1 55 S5TA-95-15A 8 Data Sheet G14875EJ2V0DS PC1945 5 REFERENCE DOCUMENTS Usage of Three-Terminal-Regulators Review of Quality and Reliability Handbook Semiconductor Device Mounting Technology Manual G12702E C12769E C10535E 5 RECOMMENDED SOLDERING CONDITIONS When soldering this product, it is highly recommended to observe the conditions as shown below. If other soldering processes are used, or if the soldering is performed under different conditions, please make sure to consult with our sales offices. For more details, refer to our document "SEMICONDUCTOR DEVICE MOUNTING TECHNOLOGY MANUAL" (C10535E). PC1945TA: 5-pin plastic mini-mold (SC-74A) Process Infrared ray reflow Conditions Peak temperature: 235C or below (Package surface temperature), Reflow time: 30 seconds or less (at 210C or higher), Maximum number of reflow processes: 3 times. VPS Peak temperature: 215C or below (Package surface temperature), Reflow time: 40 seconds or less (at 200C or higher), Maximum number of reflow processes: 3 times. VP15-00-3 Symbol IR35-00-3 Wave soldering Solder temperature: 260C or below, Flow time: 10 seconds or less, Maximum number of flow processes: 1 time, Pre-heating temperature:120C or below (Package surface temperature). WS60-00-1 Caution Apply only one kind of soldering condition to a device, or the device will be damaged by heat stress. Data Sheet G14875EJ2V0DS 9 PC1945 [ MEMO ] 10 Data Sheet G14875EJ2V0DS PC1945 [ MEMO ] Data Sheet G14875EJ2V0DS 11 PC1945 * The information in this document is current as of September, 2001. The information is subject to change without notice. For actual design-in, refer to the latest publications of NEC's data sheets or data books, etc., for the most up-to-date specifications of NEC semiconductor products. Not all products and/or types are available in every country. Please check with an NEC sales representative for availability and additional information. * No part of this document may be copied or reproduced in any form or by any means without prior written consent of NEC. NEC assumes no responsibility for any errors that may appear in this document. * NEC does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from the use of NEC semiconductor products listed in this document or any other liability arising from the use of such products. No license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC or others. * Descriptions of circuits, software and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. The incorporation of these circuits, software and information in the design of customer's equipment shall be done under the full responsibility of customer. NEC assumes no responsibility for any losses incurred by customers or third parties arising from the use of these circuits, software and information. * While NEC endeavours to enhance the quality, reliability and safety of NEC semiconductor products, customers agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. To minimize risks of damage to property or injury (including death) to persons arising from defects in NEC semiconductor products, customers must incorporate sufficient safety measures in their design, such as redundancy, fire-containment, and anti-failure features. * NEC semiconductor products are classified into the following three quality grades: "Standard", "Special" and "Specific". The "Specific" quality grade applies only to semiconductor products developed based on a customer-designated "quality assurance program" for a specific application. The recommended applications of a semiconductor product depend on its quality grade, as indicated below. Customers must check the quality grade of each semiconductor product before using it in a particular application. "Standard": Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots "Special": Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support) "Specific": Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems and medical equipment for life support, etc. The quality grade of NEC semiconductor products is "Standard" unless otherwise expressly specified in NEC's data sheets or data books, etc. If customers wish to use NEC semiconductor products in applications not intended by NEC, they must contact an NEC sales representative in advance to determine NEC's willingness to support a given application. (Note) (1) "NEC" as used in this statement means NEC Corporation and also includes its majority-owned subsidiaries. (2) "NEC semiconductor products" means any semiconductor product developed or manufactured by or for NEC (as defined above). M8E 00. 4 |
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