DATA SHEET BIPOLAR ANALOG INTEGRATED CIRCUIT µPC1945 ADJUSTABLE PRECISION SHUNT REGULATORS DESCRIPTION The µ 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)×1.5 mm(W)×1.1 mm(H) ORDERING INFORMATION Part Number µ PC1945TA Package 5-pin plastic mini-mold Marking K95 Form of Shipment – (SC-74A) µ PC1945TA-E1 5-pin plastic mini-mold K95 • Embossed taping • Pin 1 in wind-in direction (SC-74A) • 3000 units/reel µ 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 µ PC1945 PIN CONNECTION (Top View) 5-pin plastic mini-mold (SC-74A) µ PC1945TA Pin No VCC A 5 4 1 2 3 REF A K Pin Symbol Pin Name 1 REF Reference 2 A Anode 3 K Cathode 4 A Anode 5 VCC 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 µ PC1945 STANDARD CONNECTION R0 VIN VOUT R1 K VCC Note CKA VOUT REF R2 1 + R1 R2 × VREF A GND Note CKA = 100 pF minimum. Connect to prevent oscillation. Caution Supply K (Cathode) and VCC from the same power supply. Remark The µPC1945 is represented by the following symbol in this data sheet. VCC K REF A APPLICATION CIRCUIT EXAMPLE VO+ photocoupler Input to control IC VCC K REF CKA A VO− Data Sheet G14875EJ2V0DS 3 µ PC1945 ABSOLUTE MAXIMUM RATINGS (Unless otherwise specified, T A = 25°C) Parameter Symbol Ratings Unit Supply Voltage VCC 6 V Cathode Voltage VK VCC V Cathode Current IK 15 mA Cathode/Anode Reverse Current –IK –5 mA Reference Current IREF 50 µA Reference/Anode Reverse Current –IREF –5 mA Circuit Current ICC 2 mA Total Power Dissipation PT 90 mW Operating Ambient Temperature TA –20 to+85 °C Operating Junction Temperature TJ –20 to+125 °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 Symbol VCC MIN. TYP. MAX. Unit VREF 5 V 0.4 VCCNote V Cathode Voltage VK Cathode Current IK 12 mA Total Power Dissipation PT 20 mW Operating Ambient Temperature TA –20 +85 °C Operating Junction Temperature TJ –20 +100 °C 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 µ PC1945 ELECTRICAL SPECIFICATIONS (Unless otherwise specified, T A = 25°C, IK = 2 mA ( including ICC ), VREF = VCC = VK, CKA = 100 pF) Parameter Symbol Reference Voltage VREF Reference Voltage Deviation | ∆ VREF | Over Temperature Reference Voltage Deviation | ∆ VREF / ∆ VCC | Over Supply Voltage Reference Input Current IREF Reference Input Current | ∆ IREF | Deviation Over Temperature Conditions MIN. TYP. MAX. Unit 1.235 1.26 1.285 V 5 30 mV 1.5 mV/V 2 4 µA 0°C ≤ TA ≤ +70°C 0.3 1.2 µA 0°C ≤ TA ≤ +70°C VREF ≤ VK ≤ 5 V R1 = 10 kΩ, R2 = ∞ Minimum Circuit Current ICC MIN. ∆ VREF = –2% 110 400 µA Minimum Cathode Voltage VK MIN. IK : ICC = 10 : 1 60 400 mV Off-state Cathode Current IK OFF VCC = VK = 6 V, VREF = 0 V 0.01 1 µA Dynamic Impedance | ZKA | f = 1 kHz, 2 mA ≤ IK ≤ 12 mA 0.3 0.7 Ω Unity Gain Bandwidth funity R1 = R2 = 10 kΩ 500 Data Sheet G14875EJ2V0DS kHz 5 µ PC1945 TYPICAL CHRACTERISTICS (Unless otherwise specified, T A = 25°C Reference Values ) ∆ VREF vs TA PT vs TA ∆ VREF - Reference Voltage Deviation - mV PT - Total Power Dissipation - mW 100 80 695°C/W 60 40 20 0 25 50 75 100 125 30 IK = 2 mA VREF = VCC = VK CKA = 100 pF 20 10 0 −10 −20 −30 −25 0 25 75 100 125 TA - Operating Ambient Temperature - °C TA - Operating Ambient Temperature - °C IK vs VK ( I ) IK vs VK (II) 16 1.0 VREF = VCC = VK CKA = 100 pF 14 0.8 IK - Cathode Current - mA IK - Cathode Current - mA 50 0.6 0.4 0.2 VREF = VCC = VK CKA = 100 pF 12 10 8 6 4 2 0 0.2 0.4 0.6 0.8 1.0 1.2 0 1.4 0.2 VK - Cathode Voltage - V 0.4 1.0 1.2 1.4 IREF vs TA 4.0 IREF - Reference Input Current - µ A 0 IK - Cathode Current - mA 0.8 VK - Cathode Voltage - V IK vs VK (III) −1 −2 −3 −4 VREF = VCC = VK CKA = 100 pF −5 −0.8 −0.7 −0.6 −0.5 −0.4 −0.3 −0.2 −0.1 0 IK = 2 mA VREF = VCC = VK CKA = 100 pF R1 = 10 kΩ, R2 = ∞ 3.0 2.0 1.0 0 −25 VK - Cathode Voltage - V 6 0.6 Data Sheet G14875EJ2V0DS 0 25 50 75 100 125 TA - Operating Ambient Temperature - °C µ PC1945 Av, φ vs f | ZKA | vs f 0 | ZKA | - Dynamic Impedance - Ω Av 40 50 −50 φ −100 20 φ - Phase - ° Av - Voltage Gain - dB 60 2.2 kΩ IK υo 0 υin −150 10 kΩ 10 kΩ TA = 25 C VK = VCC = VREF IK = 2mA 10 1.0 100 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 a,b,c IK - Cathode Current - mA 1.6 1.4 Test Circuit a: a: VK = VCC = VREF b: VK = VCC = 3 V c: VK = VCC = 5 V 2.2 k Ω IK 1.2 CKA 1 Unstable 0.8 Stable a 0.6 Stable b, c: Unstable b 0.4 IK Unstable 0.2 2.2 k Ω R CKA 0 1 10 100 1000 10000 100000 CKA - Lode Capacitance - pF 10 kΩ 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 µ PC1945 PACKAGE DRAWING 5 PIN PLASTIC MINI MOLD (Unit: mm) detail of lead end F G R L E A H I B J S N C D M M K S ITEM A MILLIMETERS B 2.9±0.2 0.3 C 0.95 (T.P.) D 0.32 +0.05 −0.02 E 0.05±0.05 F 1.4 MAX. G 1.1+0.2 −0.1 H 2.8±0.2 I 1.5+0.2 −0.1 J 0.65 +0.1 −0.15 K 0.16 +0.1 −0.06 L 0.4±0.2 M N 0.19 0.1 R 5°±5° S5TA-95-15A 8 Data Sheet G14875EJ2V0DS µ PC1945 ★ ★ REFERENCE DOCUMENTS Usage of Three-Terminal-Regulators G12702E Review of Quality and Reliability Handbook C12769E Semiconductor Device Mounting Technology Manual C10535E 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). µPC1945TA: 5-pin plastic mini-mold (SC-74A) Process Infrared ray reflow Conditions Peak temperature: 235°C or below (Package surface temperature), Symbol IR35-00-3 Reflow time: 30 seconds or less (at 210°C or higher), Maximum number of reflow processes: 3 times. VPS Peak temperature: 215°C or below (Package surface temperature), VP15-00-3 Reflow time: 40 seconds or less (at 200°C or higher), Maximum number of reflow processes: 3 times. Wave soldering Solder temperature: 260°C or below, Flow time: 10 seconds or less, WS60-00-1 Maximum number of flow processes: 1 time, Pre-heating temperature:120°C or below (Package surface temperature). Caution Apply only one kind of soldering condition to a device, or the device will be damaged by heat stress. Data Sheet G14875EJ2V0DS 9 µ PC1945 [ MEMO ] 10 Data Sheet G14875EJ2V0DS µ PC1945 [ MEMO ] Data Sheet G14875EJ2V0DS 11 µ 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. 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