ZHCSG55A November 2016 – February 2017 TPS54824
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Fixed Frequency PWM Control
- 7.3.2 Continuous Conduction Mode Operation (CCM)
- 7.3.3 VIN Pins and VIN UVLO
- 7.3.4 Voltage Reference and Adjusting the Output Voltage
- 7.3.5 Error Amplifier
- 7.3.6 Enable and Adjustable UVLO
- 7.3.7 Soft Start and Tracking
- 7.3.8 Safe Start-up into Pre-Biased Outputs
- 7.3.9 Power Good
- 7.3.10 Sequencing (SS/TRK)
- 7.3.11 Adjustable Switching Frequency (RT Mode)
- 7.3.12 Synchronization (CLK Mode)
- 7.3.13 Bootstrap Voltage and 100% Duty Cycle Operation (BOOT)
- 7.3.14 Output Overvoltage Protection (OVP)
- 7.3.15 Overcurrent Protection
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Switching Frequency
- 8.2.2.2 Output Inductor Selection
- 8.2.2.3 Output Capacitor
- 8.2.2.4 Input Capacitor
- 8.2.2.5 Output Voltage Resistors Selection
- 8.2.2.6 Soft-start Capacitor Selection
- 8.2.2.7 Undervoltage Lockout Set Point
- 8.2.2.8 Bootstrap Capacitor Selection
- 8.2.2.9 PGOOD Pull-up Resistor
- 8.2.2.10 Compensation
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Voltage | VIN | –0.3 | 19 | V |
| BOOT | –0.3 | 27 | ||
| BOOT (10 ns transient) | –0.3 | 30 | ||
| BOOT (vs SW) | –0.3 | 7 | ||
| SW | –1 | 20 | ||
| SW (10 ns transient) | –3 | 23 | ||
| EN, SS/TRK, PGOOD, RT/CLK, FB, COMP | –0.3 | 6.5 | ||
| Operating Junction Temperature Range, TJ | -40 | 150 | °C | |
| Storage Temperature Range, TSTG | -55 | 150 | °C | |
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
6.2 ESD Ratings
| VALUE | UNIT | |||
|---|---|---|---|---|
| V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) | ±2000 | V |
| Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) | ±500 | |||
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)| Parameter | MIN | NOM | MAX | UNIT | |
|---|---|---|---|---|---|
| VIN | Input voltage range | 4.5 | 17 | V | |
| VOUT | Output Voltage | 0.6 | 12 | V | |
| IOUT | Output current | 8 | A | ||
| TJ | Operating junction temperature | -40 | 150 | °C | |
| fSW | Switching Frequency (RT mode and PLL mode) | 200 | 1600 | kHz | |
6.4 Thermal Information
| THERMAL METRIC(1) | TPS54824 | UNIT | |
|---|---|---|---|
| RNV | |||
| 18 PINS | |||
| ThetaJA | Junction-to-ambient thermal resistance JEDEC | 57.1 | °C/W |
| ThetaJA | Junction-to-ambient thermal resistance EVM | 34 | °C/W |
| ThetaJCtop | Junction-to-case (top) thermal resistance | 26.3 | °C/W |
| ThetaJB | Junction-to-board thermal resistance | 18.8 | °C/W |
| PsiJT | Junction-to-top characterization parameter | 0.8 | °C/W |
| PsiJB | Junction-to-board characterization parameter | 18.8 | °C/W |
| ThetaJCbot | Junction-to-case (bottom) thermal resistance | 1.2 | °C/W |
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.
6.5 Electrical Characteristics
TJ = -40°C to 150°C, VIN = 4.5 V to 17 V (unless otherwise noted)| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| INPUT VOLTAGE | ||||||
| UVLO_rise | VIN under-voltage lockout | V(VIN) rising | 4.1 | 4.3 | V | |
| UVLO_fall | V(VIN) falling | 3.7 | 3.9 | V | ||
| UVLO_hys | Hysteresis VIN voltage | 0.2 | V | |||
| Ivin | Operating non-switching supply current | V(EN) = 5 V, V(FB) = 1.5 V | 580 | 800 | µA | |
| Ivin_sdn | Shutdown supply current | V(EN) = 0 V | 3 | 11 | µA | |
| ENABLE | ||||||
| Ven_rise | EN threshold | V(EN) rising | 1.20 | 1.26 | V | |
| Ven_fall | V(EN) falling | 1.1 | 1.15 | V | ||
| Ven_hys | EN pin threshold voltage hysteresis | 50 | mV | |||
| Ip | EN pin sourcing current | V(EN) = 1.1V | 1.2 | µA | ||
| Iph | EN pin sourcing current | V(EN) = 1.3V | 4.8 | µA | ||
| Ih | EN pin hysteresis current | 3.6 | µA | |||
| FB | ||||||
| VFB | Regulated FB voltage | TJ = 25°C | 596 | 600 | 604 | mV |
| 595 | 600 | 605 | mV | |||
| ERROR AMPLIFIER | ||||||
| gmea | Error Amplifier Transconductance (gm) | –2 µA < I(COMP) < 2 µA, V(COMP) = 1 V | 1100 | µA/V | ||
| Error Amplifier DC gain | 80 | dB | ||||
| Icomp_src | Error Amplifier source current | V(FB) = 0 V | 100 | µA | ||
| Icomp_snk | Error Amplifier sink current | V(FB) = 2 V | -100 | µA | ||
| gmps | Power Stage Transconductance | 16 | A/V | |||
| SOFT-START | ||||||
| Iss | Soft-start current | 5 | µA | |||
| V(SS/TRK) to V(FB) matching | V(SS/TRK) = 0.4 V | 25 | mV | |||
| MOSFET | ||||||
| Rds(on)_h | High-side switch resistance | TA = 25°C, V(VIN) = 12 V | 14.1 | mΩ | ||
| TA = 25°C, V(VIN) = 4.5 V, V(BOOT-SW) = 4.5 V | 15.9 | mΩ | ||||
| Rds(on)_l | Low-side switch resistance | TA = 25°C, V(VIN) = 12 V | 6.1 | mΩ | ||
| TA = 25°C, V(VIN) = 4.5 V | 6.9 | mΩ | ||||
| BOOT UVLO Falling | 2.2 | 2.6 | V | |||
| CURRENT LIMIT | ||||||
| Ioc_HS_pk | High-side peak current limit | 10.8 | 12.9 | 15 | A | |
| Ioc_LS_snk | Low-side sinking current limit | –3.4 | A | |||
| Ioc_LS_src | Low-side sourcing current limit | 9.3 | 11.4 | 13.6 | A | |
| RT/CLK | ||||||
| VIH | Logic high input voltage | 2 | V | |||
| VIL | Logic low input voltage | 0.8 | V | |||
| PGOOD | ||||||
| Power good threshold | V(FB) rising (fault) | 108% | ||||
| V(FB) falling (good) | 106% | |||||
| V(FB) rising (good) | 91% | |||||
| V(FB) falling (fault) | 89% | |||||
| Ipg_lkg | Leakage current when pulled high | V(PGOOD) = 5 V | 5 | nA | ||
| Vpg_low | PGOOD voltage when pulled low | I(PGOOD) = 2 mA | 0.3 | V | ||
| Minimum VIN for valid output | V(PGOOD) < 0.5 V, I(PGOOD) = 4 mA | 0.7 | 1 | V | ||
| Thermal protection | ||||||
| TTRIP | Thermal protection trip point | Temperature Rising | 170 | °C | ||
| THYST | Thermal protection hysteresis | 15 | °C | |||
6.6 Switching Characteristics
TJ = -40°C to 150°C, V(VIN) = 4.5 V to 17 V (unless otherwise noted)| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| EN | ||||||
| EN to start of switching | 135 | µs | ||||
| PGOOD | ||||||
| Deglitch time PGOOD going high | 272 | Cycles | ||||
| Deglitch time PGOOD going low | 16 | Cycles | ||||
| SW | ||||||
| ton_min | Minimum on time | Measured at 50% to 50% of VIN, L = 0.68 µH, IOUT = 0.1 A | 95 | ns | ||
| toff_min | Minimum off time (1) | V(BOOT-SW) ≥ 2.6 V | 0 | ns | ||
| RT/CLK | ||||||
| fsw_min | Minimum switching frequency (RT mode) | R(RT/CLK) = 250 kΩ | 200 | kHz | ||
| Switching frequency (RT mode) | R(RT/CLK) = 100 kΩ | 450 | 500 | 550 | kHz | |
| fsw_max | Maximum switching frequency (RT mode) | R(RT/CLK) = 30.1 kΩ | 1.6 | MHz | ||
| fsw_clk | Switching frequency synchronization range (PLL mode) | 200 | 1600 | kHz | ||
| RT/CLK falling edge to SW rising edge delay (PLL mode) | Measure at 500kHz with RT resistor in series with RT/CLK | 70 | ns | |||
| HICCUP | ||||||
| Wait time before hiccup | 512 | Cycles | ||||
| Hiccup time before restart | 16384 | Cycles | ||||
(1) Specified by design.
6.7 Timing Requirements
TJ = -40°C to 150°C, V(VIN) = 4.5 V to 17 V (unless otherwise noted)| MIN | NOM | MAX | UNIT | |||
|---|---|---|---|---|---|---|
| RT/CLK | ||||||
| Minimum synchronization signal pulse width (PLL mode) | 35 | ns | ||||
6.8 Typical Characteristics
| V(EN) = 0.4 V |
| V(SS/TRK) = 0.4 V |
| V(FB) = 0.6 V | V(PGOOD) = 5 V |
| R(RT/CLK) = 100 kΩ |
| V(EN) = 5 V | V(FB) = 0.8 V |
| VIN = 12 V | L = 0.68 µH |
| R(RT/CLK) = 30.1 kΩ |
