LM5008A
Synchronous Buck Switching RegulatorThe LM5008A is a synchronous buck switching regulator from Texas Instruments. View the full LM5008A datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Synchronous Buck Switching Regulator
Package
VSSOP (8), WSON (8)
Key Specifications
| Parameter | Value |
|---|---|
| Output Current | 350 mA |
| Output Voltage | Adjustable from 2.5 V |
| Input Voltage Range | 6 V to 95 V |
| Current Limit Threshold | 0.51 A (typical) |
| Feedback Reference Voltage | 2.5 V |
| Operating Quiescent Current | 110 μA (typical) |
| Package Dimensions (WSON-8) | 4.00 mm × 4.00 mm |
| Package Dimensions (VSSOP-8) | 3.00 mm × 3.00 mm |
| Operating Junction Temperature Range | -40 °C to 125 °C |
| Integrated Buck Switch Voltage Rating | 100 V |
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
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 | 5.3 190 3 | V mV μs | ||||
| I operating current IN | FB = 3 V, V IN = 48 V | T J = 25°C to 125°C T J = -40°C T J = 25°C | 550 110 | 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 | CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT |
| Current limit threshold | T J = 25°C T J = -40°C to 125°C | 0.41 | 0.51 | 0.61 | A | ||
| 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 | — |
| 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 | 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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