LM5008ASD/NOPB
Synchronous Buck Switching RegulatorThe LM5008ASD/NOPB is a synchronous buck switching regulator from Texas Instruments. View the full LM5008ASD/NOPB datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Synchronous Buck Switching Regulator
Overview
Part: LM5008A — Texas Instruments
Type: Synchronous Buck Switching Regulator
Description: 6–95 V input, 350 mA constant on-time DC/DC buck switching regulator with an integrated 100-V N-channel buck switch.
Operating Conditions:
- Supply voltage: 6–95 V
- Operating junction temperature: -40 to 125 °C
Absolute Maximum Ratings:
- Max supply voltage (VIN to GND): 100 V
- Max junction temperature: 150 °C
Key Specs:
- Output current: 350 mA
- VCC regulator output: 6.6 V (min) to 7.4 V (max) at TJ = 25°C, VIN = 48 V
- Current limit threshold: 0.41 A (min) to 0.61 A (max) at TJ = -40°C to 125°C
- Buck switch RDS(on): 1.25 Ω (typ) at TJ = 25°C, ITEST = 200 mA
- FB reference threshold: 2.5 V (typ) at TJ = 25°C
- Thermal shutdown temperature: 165 °C (typ)
- VIN operating current: 110 μA (typ) at FB = 3 V, VIN = 48 V, TJ = 25°C
Features:
- Integrated 100-V N-Channel Buck Switch
- Internal Start-Up Regulator
- No Loop Compensation Required
- Ultra-Fast Transient Response
- On-Time Varies Inversely With Input Voltage
- Adjustable Output Voltage From 2.5 V
- Intelligent Current Limit
- Thermal Shutdown
Applications:
- Non-Isolated Telecommunication Buck Regulators
- Secondary High-Voltage Post Regulators
- 48-V Automotive Systems
Package:
- VSSOP (8) - 3.00 mm × 3.00 mm
- WSON (8) - 4.00 mm × 4.00 mm
Features
- 1 · Operating Input Voltage Range: 6 V to 95 V
- Integrated 100-V N-Channel Buck Switch
- Internal Start-Up Regulator
- No Loop Compensation Required
- Ultra-Fast Transient Response
- On-Time Varies Inversely With Input Voltage
- Operating Frequency Remains Constant With Varying Line Voltage and Load Current
- Adjustable Output Voltage From 2.5 V
- Highly Efficient Operation
- Precision Internal Reference
- Low Bias Current
- Intelligent Current Limit
- Thermal Shutdown
- 8-Pin VSSOP and 8-Pin WSON Packages
- Create a Custom Design Using the LM5008A With the WEBENCH ® Power Designer
Applications
- Non-Isolated Telecommunication Buck Regulators
- Secondary High-Voltage Post Regulators
- 48-V Automotive Systems
Pin Configuration
Pin Functions
Pin Functions
| PIN | PIN | TYPE | DESCRIPTION |
|---|---|---|---|
| NO. | NAME | TYPE | DESCRIPTION |
| 1 | SW | P | Switching node: power switching node. Connect to the output inductor, re-circulating diode, and bootstrap capacitor. |
| 2 | BST | I | Boost pin (bootstrap capacitor input): an external capacitor is required between the BST and the SW pins. A 0.01-μF ceramic capacitor is recommended. An internal diode charges the capacitor from V CC during each off-time. |
| 3 | RCL | I | Current limit off-time set pin: a resistor between this pin and RTN sets the off-time when current limit is detected. The off-time is preset to 35 μs if FB = 0 V. |
| 4 | RTN | G | Ground pin: ground for the entire circuit. |
| 5 | FB | I | Feedback input from regulated output: this pin is connected to the inverting input of the internal regulation comparator. The regulation threshold is 2.5 V. |
| 6 | RT/SD | I | On-time set pin: a resistor between this pin and VIN sets the switch on time as a function of V IN . The minimum recommended on time is 400 ns at the maximum input voltage. This pin can be used for remote shutdown. |
| 7 | VCC | P | Output from the internal high voltage series pass regulator: this regulated voltage provides gate drive power for the internal buck switch. An internal diode is provided between this pin and the BST pin. A local 0.47-μF decoupling capacitor is required. The series pass regulator is current limited to 9 mA. |
| 8 | VIN | P | Input voltage: input operating range from 6 V to 95 V. |
| - | EP | G | Exposed pad: the exposed pad has no electrical contact. Connect to system ground plane for reduced thermal resistance. (WSON package only) |
NGU Package 8-Pin WSON Top View
Pin Functions
Electrical Characteristics
TJ = 25°C and VIN = 48 V (unless otherwise noted) (1)
| PARAMETER | TEST CONDITIONS | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|---|
| VCC SUPPLY | VCC SUPPLY | VCC SUPPLY | VCC SUPPLY | VCC SUPPLY | VCC SUPPLY | VCC SUPPLY | VCC SUPPLY |
| V CC Reg | V CC regulator output | V IN = 48 V | T J = 25°C T = -40°C to 125°C | 6.6 | 7 | 7.4 | V |
| V IN - V CC | 6 V < V IN < 8.5 V | J | 100 | mV | |||
| V CC bypass threshold V CC bypass hysteresis | V IN increasing V IN = 6 V | 8.5 300 100 | V mV Ω | ||||
| V CC output impedance | V IN = 10 V V IN = 48 V | 8.8 0.8 | Ω Ω | ||||
| V CC current limit | V IN = 48 V | 9.2 | mA | ||||
| V CC UVLO V CC UVLO hysteresis V CC UVLO filter delay | V CC increasing V | T J = 25°C | 5.3 190 3 550 | V mV μs | |||
| IN I operating current | FB = 3 V, V IN = 48 | T J = -40°C to 125°C T J = 25°C | 110 | 750 | μA | ||
| I IN shutdown current | RT/SD = 0 V | T J = -40°C to 125°C | 176 | μA | |||
| CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT T J = 25°C | CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT 0.51 | CURRENT LIMIT | CURRENT LIMIT A |
| Current limit threshold | T J = -40°C to 125°C | 0.41 | 0.61 | ||||
| Current limit response time | I switch overdrive = 0.1 A, time to | switch off | 350 | ns | |||
| T OFF-1 | Off-time generator | FB = 0 V, R CL = 100 k Ω | 35 | μs | |||
| T OFF-2 | Off-time generator | FB = 2.3 V, R CL = 100 k Ω | 2.56 | μs | |||
| ON-TIME GENERATOR | ON-TIME GENERATOR | ON-TIME GENERATOR | ON-TIME GENERATOR | ON-TIME GENERATOR | ON-TIME GENERATOR | ON-TIME GENERATOR | ON-TIME GENERATOR |
| T ON - 1 | V IN = 10 V, R ON = 200 k Ω | T J = 25°C T J = -40°C to 125°C | 2.15 | 2.77 | 3.5 | μs | |
| T ON - 2 | V IN = 95 V, R ON = 200 k Ω | T J = 25°C T J = -40°C to 125°C | 200 | 300 | 420 | ns | |
| Remote shutdown threshold Remote shutdown hysteresis | Rising | T J = 25°C T J = -40°C to 125°C | 0.4 | 0.7 35 | 1.05 | V mV | |
| MINIMUM OFF-TIME | MINIMUM OFF-TIME | MINIMUM OFF-TIME | MINIMUM OFF-TIME | MINIMUM OFF-TIME | MINIMUM OFF-TIME | MINIMUM OFF-TIME | MINIMUM OFF-TIME |
| Minimum off-timer | V FB = 0 V | 300 | ns | ||||
| REGULATION AND OV COMPARATORS | REGULATION AND OV COMPARATORS | REGULATION AND OV COMPARATORS | REGULATION AND OV COMPARATORS | REGULATION AND OV COMPARATORS | REGULATION AND OV COMPARATORS | REGULATION AND OV COMPARATORS | REGULATION AND OV COMPARATORS |
| FB reference threshold | Internal reference, trip point for switch ON | T J = 25°C | 2.5 | V | |||
| FB overvoltage threshold FB bias current | Trip point for switch OFF | T J = -40°C to 125°C | 2.445 | 2.875 100 | 2.55 | V nA | |
| THERMAL SHUTDOWN | THERMAL SHUTDOWN | THERMAL SHUTDOWN | THERMAL SHUTDOWN | THERMAL SHUTDOWN | THERMAL SHUTDOWN | THERMAL SHUTDOWN | THERMAL SHUTDOWN |
| Tsd | Thermal shutdown temperature Thermal shutdown hysteresis | 165 25 | °C °C |
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | |
|---|---|---|---|
| V IN to GND | -0.3 | 100 | V |
| BST to GND | -0.3 | 114 | V |
| SW to GND (steady-state) | -1 | V | |
| BST to V CC | 100 | V | |
| BST to SW | 14 | V | |
| V CC to GND | 14 | V | |
| All other inputs to GND | -0.3 | 7 | V |
| Storage temperature, T stg | -55 | 150 | °C |
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | MAX | UNIT | |
|---|---|---|---|
| V IN | 6 | 95 | V |
| Operating junction temperature | -40 | 125 | °C |
Thermal Information
| LM5008A | LM5008A | ||
|---|---|---|---|
| THERMAL METRIC | (1) | DGK (VSSOP) | NGU (WSON) |
| 8 PINS | 8 PINS | ||
| R θ JA | Junction-to-ambient thermal resistance | 139.7 | 42 |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 51.2 | 27.6 |
| R θ JB | Junction-to-board thermal resistance | 70.5 | 18.5 |
| ψ JT | Junction-to-top characterization parameter | 3.4 | 0.3 |
| ψ JB | Junction-to-board characterization parameter | 69.5 | 18.5 |
| R θ JC(bot) | Junction-to-case (bottom) thermal resistance | - | 4.3 |
Typical Application
Copyright © 2016, Texas Instruments Incorporated
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| LM5008 | Texas Instruments | — |
| LM5008A | Texas Instruments | VSSOP (8) |
| LM5008AMM/NOPB | Texas Instruments | — |
| LM5008AMM/NOPB.A | Texas Instruments | — |
| LM5008AMM/NOPB.B | Texas Instruments | — |
| LM5008AMMX | Texas Instruments | — |
| LM5008AMMX/NOPB | Texas Instruments | — |
| LM5008AMMX/NOPB.A | Texas Instruments | — |
| LM5008AMMX/NOPB.B | Texas Instruments | — |
| LM5008ASD/NOPB.A | Texas Instruments | — |
| LM5008ASD/NOPB.B | Texas Instruments | — |
| LM5008ASDX | Texas Instruments | — |
| LM5008ASDX/NOPB | Texas Instruments | — |
| LM5008ASDX/NOPB.A | Texas Instruments | — |
| LM5008ASDX/NOPB.B | Texas Instruments | — |
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