LM2599シリーズのレギュレータは、降圧型(バック)スイッチング・レギュレータのすべてのアクティブ機能を内蔵したモノリシックICで、優れたラインおよび負荷レギュレーションで 3Aの負荷を駆動できます。これらのデバイスは、3.3V、5V、12Vの固定出力電圧と、可変出力バージョンで利用可能です。
LM2598はLM259xファミリのメンバーで、監視およびパフォーマンスの機能が追加されています。
必要な外付け部品が少なくてすみ、使い方が簡単で、内部周波数補償、ラインおよび負荷の仕様の強化、固定周波数のオシレータ、シャットダウン/ソフトスタート、エラー・フラグ遅延、およびエラー・フラグ出力の機能を備えています。
型番 | パッケージ | 本体サイズ(公称) |
---|---|---|
LM2599 | TO-220 (7) | 14.986mm×10.16mm |
TO-263 (7) | 10.10mm×8.89mm |
Changes from C Revision (April 2013) to D Revision
Changes from B Revision (April 2013) to C Revision
LM2599シリーズは150kHzのスイッチング周波数で動作するため、低周波数で動作するスイッチング・レギュレータに比べて、サイズの小さなフィルタ部品を使用できます。標準的な7ピンのTO-220パッケージで、いくつかの異なるリードフォーミング品で供給されるほか、7ピンのTO-263表面実装パッケージでも供給されます。
LM2599シリーズでの使用に最適な標準インダクタ(スルーホールと表面実装タイプのいずれも)をいくつかのメーカーから入手できます。このため、スイッチング電源の設計が大幅に簡素化されます。
また、入力電圧と出力負荷のあらゆる条件において、出力電圧について±4%、オシレータ周波数について±15%の許容誤差が保証されています。外部シャットダウンが搭載されており、スタンバイ電流は標準値で80μAです。自己保護機能として、出力スイッチのための2段階電流制限回路と、異常時でも完全に保護動作が保証される過熱シャットダウン機能を備えています。
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | +VIN | I | This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. |
2 | Output | O | Internal switch. The voltage at this pin switches between approximately (+VIN − VSAT) and approximately −0.5 V, with a duty cycle of VOUT/VIN. To minimize coupling to sensitive circuitry, the PCB copper area connected to this pin must be kept to a minimum. |
3 | Error Flag | O | Open-collector output that provides a low signal (flag transistor ON) when the regulated output voltage drops more than 5% from the nominal output voltage. On start up, Error Flag is low until VOUT reaches 95% of the nominal output voltage and a delay time determined by the Delay pin capacitor. This signal can be used as a reset to a microprocessor on power-up. |
4 | Ground | — | Circuit ground. |
5 | Delay | O | At power-up, this pin can be used to provide a time delay between the time the regulated output voltage reaches 95% of the nominal output voltage, and the time the error flag output goes high. |
6 | Feedback | I | Senses the regulated output voltage to complete the feedback loop. |
7 | Shutdown/Soft-start | I | This dual function pin provides the following features: (a) Allows the switching regulator circuit to be shut down using logic level signals thus dropping the total input supply current to approximately 80 μA. (b) Adding a capacitor to this pin provides a soft-start feature which minimizes start-up current and provides a controlled ramp up of the output voltage. |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
Maximum supply voltage, VIN | 45 | V | |||
SD/SS pin input voltage(3) | 6 | V | |||
Delay pin voltage(3) | 1.5 | V | |||
Flag pin voltage | –0.3 | 45 | V | ||
Feedback pin voltage | –0.3 | 25 | V | ||
Output voltage to ground (steady-state) | –1 | V | |||
Power dissipation | Internally limited | ||||
Lead temperature | KTW package | Vapor phase (60 s) | 215 | °C | |
Infrared (10 s) | 245 | ||||
NDZ package (soldering, 10 s) | 260 | ||||
Maximum junction temperature | 150 | °C | |||
Storage temperature, Tstg | −65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
MIN | MAX | UNIT | |
---|---|---|---|
Supply voltage | 4.5 | 40 | V |
Temperature | –40 | 125 | °C |
THERMAL METRIC(1) | LM2599 | UNIT | |||
---|---|---|---|---|---|
KTW (TO-263) | NDZ (TO-220) | ||||
7 PINS | 7 PINS | ||||
RθJA | Junction-to-ambient thermal resistance(2)(3) | See(4) | — | 50 | °C/W |
See(5) | 50 | — | |||
See(6) | 30 | — | |||
See(7) | 20 | — | |||
RθJC(top) | Junction-to-case (top) thermal resistance | 2 | 2 | °C/W |
PARAMETER | TEST CONDITIONS | MIN(1) | TYP(2) | MAX (1) | UNIT | ||
---|---|---|---|---|---|---|---|
SYSTEM PARAMETERS(3) (see Figure 43 for test circuit) | |||||||
VOUT | Output voltage | 4.75 V ≤ VIN ≤ 40 V, 0.2 A ≤ ILOAD ≤ 3 A |
TJ = 25°C | 3.168 | 3.3 | 3.432 | V |
–40°C ≤ TJ ≤ 125°C | 3.135 | 3.465 | |||||
η | Efficiency | VIN = 12 V, ILOAD = 3 A | 73% |
PARAMETER | TEST CONDITIONS | MIN(1) | TYP(2) | MAX(1) | UNIT | ||
---|---|---|---|---|---|---|---|
SYSTEM PARAMETERS(3) (see Figure 43 for test circuit) | |||||||
VOUT | Output voltage | 7 V ≤ VIN ≤ 40 V, 0.2 A ≤ ILOAD ≤ 3 A |
TJ = 25°C | 4.8 | 5 | 5.2 | V |
–40°C ≤ TJ ≤ 125°C | 4.75 | 5.25 | |||||
η | Efficiency | VIN = 12 V, ILOAD = 3 A | 80% |
PARAMETER | TEST CONDITIONS | MIN(1) | TYP(2) | MAX(1) | UNIT | ||
---|---|---|---|---|---|---|---|
SYSTEM PARAMETERS(3) (see Figure 43 for test circuit) | |||||||
VOUT | Output voltage | 15 V ≤ VIN ≤ 40 V, 0.2 A ≤ ILOAD ≤ 3 A |
TJ = 25°C | 11.52 | 12 | 12.48 | V |
–40°C ≤ TJ ≤ 125°C | 11.4 | 12.6 | |||||
η | Efficiency | VIN = 25 V, ILOAD = 3 A | 90% |
PARAMETER | TEST CONDITIONS | MIN(1) | TYP(2) | MAX(1) | UNIT | ||
---|---|---|---|---|---|---|---|
SYSTEM PARAMETERS(3) (see Figure 43 for test circuit) | |||||||
VFB | Feedback voltage | 4.5 V ≤ VIN ≤ 40 V, 0.2 A ≤ ILOAD ≤ 3 A | 1.23 | V | |||
VOUT programmed for 3 V, circuit of Figure 43 |
TJ = 25°C | 1.193 | 1.267 | ||||
–40°C ≤ TJ ≤ 125°C | 1.18 | 1.28 | |||||
η | Efficiency | VIN = 12 V, VOUT = 3 V, ILOAD = 3 A | 73% |
PARAMETER | TEST CONDITIONS | MIN(1) | TYP(2) | MAX(1) | UNIT | ||
---|---|---|---|---|---|---|---|
DEVICE PARAMETERS | |||||||
Ib | Feedback bias current | Adjustable voltage version only, VFB = 1.3 V | TJ = 25°C | 10 | 50 | nA | |
–40°C ≤ TJ ≤ 125°C | 100 | ||||||
fO | Oscillator frequency(3) | TJ = 25°C | 127 | 150 | 173 | kHz | |
–40°C ≤ TJ ≤ 125°C | 110 | 173 | |||||
VSAT | Saturation voltage | IOUT = 3 A(4)(5) | TJ = 25°C | 1.16 | 1.4 | V | |
–40°C ≤ TJ ≤ 125°C | 1.5 | ||||||
DC | Max duty cycle (ON)(5) | 100% | |||||
Min duty cycle (OFF)(6) | 0% | ||||||
ICL | Current limit | Peak current(4) (5) | TJ = 25°C | 3.6 | 4.5 | 6.9 | A |
–40°C ≤ TJ ≤ 125°C | |||||||
3.4 | 7.5 | ||||||
IL | Output leakage current | Output = 0 V, VIN = 40 V(4) (6) | 50 | μA | |||
Output = −1 V | 2 | 30 | mA | ||||
IQ | Operating quiescent current | SD/SS pin open(6) | 5 | 10 | mA | ||
ISTBY | Current standby quiescent | SD/SS pin = 0 V, VIN = 40 V | TJ = 25°C | 80 | 200 | μA | |
–40°C ≤ TJ ≤ 125°C | 250 | μA | |||||
SHUTDOWN/SOFT-START CONTROL – See Figure 43 | |||||||
VSD | Shutdown threshold voltage | 1.3 | V | ||||
Low (Shutdown mode), –40°C ≤ TJ ≤ 125°C | 0.6 | ||||||
High (Soft-start mode), –40°C ≤ TJ ≤ 125°C | 2 | ||||||
VSS | Soft-start voltage | VOUT = 20% of nominal output voltage | 2 | V | |||
VOUT = 100% of nominal output voltage | 3 | ||||||
ISD | Shutdown current | VSHUTDOWN = 0.5 V | 5 | 10 | μA | ||
ISS | Soft-start current | VSoft-start = 2.5 V | 1.6 | 5 | μA | ||
FLAG/DELAY CONTROL – See Figure 43 | |||||||
Regulator dropout detector threshold voltage | Low (flag ON) | 92% | 96% | 98% | |||
VFSAT | Voltage flag output saturation | ISINK = 3 mA | 0.3 | V | |||
VDELAY = 0.5 V | TJ = 25°C | 0.7 | V | ||||
–40°C ≤ TJ ≤ 125°C | 1 | ||||||
IFL | Flag output leakage current | VFLAG = 40 V | 0.3 | μA | |||
Voltage delay pin threshold | 1.25 | V | |||||
Low (flag ON) | 1.21 | V | |||||
High (flag OFF) and VOUT regulated | 1.29 | ||||||
Delay pin source current | VDELAY = 0.5 V | 3 | 6 | μA | |||
Delay pin saturation | Low (flag ON) | TJ = 25°C | 55 | 350 | mV | ||
–40°C ≤ TJ ≤ 125°C | 400 |