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.
LM5008A shares its datasheet with LM5008, whose page lists every part number it covers.
Official LM5008A datasheet (PDF) — the source this page was extracted from.
LM5008A 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 |
LM5008A Overview
Part: LM5008A — Texas Instruments
Type: Constant On-Time DC/DC Buck Switching Regulator
Description: 6–95 V input, 350 mA constant on-time buck regulator with integrated 100-V N-channel buck switch, 2.5 V feedback reference, and no loop compensation required.
Operating Conditions:
- Supply voltage (VIN): 6–95 V
- Operating junction temperature: -40 to 125 °C
- Output voltage adjustable from 2.5 V; minimum recommended on-time 400 ns at maximum input voltage
Absolute Maximum Ratings:
- VIN to GND: -0.3 to 100 V
- BST to GND: -0.3 to 114 V
- VCC to GND: 14 V max
- BST to SW: 14 V max
- All other inputs to GND: -0.3 to 7 V
- Storage temperature: -55 to 150 °C
Key Specs:
- VCC regulator output: 6.6 / 7 / 7.4 V (min/typ/max), VIN = 48 V
- VCC current limit: 9.2 mA typ
- Operating current (FB = 3 V, VIN = 48 V): 750 μA max (TJ = -40 to 125 °C)
- Shutdown current (RT/SD = 0 V): 176 μA max
- Current limit threshold: 0.51 A typ (TJ = 25 °C); 0.41–0.61 A (TJ = -40 to 125 °C)
- FB reference threshold: 2.5 V typ; 2.445–2.55 V over temperature
- Buck switch RDS(on): 1.25 Ω typ (TJ = 25 °C), 2.57 Ω max (over temperature, ITEST = 200 mA)
- Minimum off-time: 300 ns typ
- Thermal shutdown: 165 °C typ, 25 °C hysteresis
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, keeping frequency nearly constant
- Intelligent current limit with forced off-time inversely proportional to VOUT
- Thermal shutdown, VCC UVLO, gate drive UVLO, maximum duty cycle limiter, precharge switch
- Remote shutdown via RT/SD pin
- No minimum load current requirement (difference from LM5008)
Applications:
- Non-isolated telecommunication buck regulators
- Secondary high-voltage post regulators
- 48-V automotive systems
Package:
- VSSOP-8 (DGK), 3.00 mm × 3.00 mm
- WSON-8 (NGU), 4.00 mm × 4.00 mm
LM5008A 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
LM5008A Applications
- Non-Isolated Telecommunication Buck Regulators
- Secondary High-Voltage Post Regulators
- 48-V Automotive Systems
LM5008A Pin Configuration
Pin Functions
| PIN - NO. | PIN - 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
LM5008A 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 |
LM5008A 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 |
LM5008A 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 |
LM5008A Thermal Information
| THERMAL METRIC | (1) | LM5008A - DGK (VSSOP) - 8 PINS | LM5008A - NGU (WSON) - 8 PINS | UNIT |
|---|---|---|---|---|
| R θ JA | Junction-to-ambient thermal resistance | 139.7 | 42 | °C/W |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 51.2 | 27.6 | °C/W |
| R θ JB | Junction-to-board thermal resistance | 70.5 | 18.5 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 3.4 | 0.3 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 69.5 | 18.5 | °C/W |
| R θ JC(bot) | Junction-to-case (bottom) thermal resistance | - | 4.3 | °C/W |
LM5008A Typical Application
Copyright © 2016, Texas Instruments Incorporated
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
| Part Number | Manufacturer | Package |
|---|---|---|
| LM5008 | Texas Instruments | — |
| LM5008AMM/NOPB | Texas Instruments | VSSOP-8 |
| LM5008AMM/NOPB.A | Texas Instruments | VSSOP-8 |
| LM5008AMM/NOPB.B | Texas Instruments | VSSOP-8 |
| LM5008AMMX | Texas Instruments | VSSOP-8 |
| LM5008AMMX/NOPB | Texas Instruments | VSSOP-8 |
| LM5008AMMX/NOPB.A | Texas Instruments | VSSOP-8 |
| LM5008AMMX/NOPB.B | Texas Instruments | VSSOP-8 |
| LM5008ASD/NOPB | Texas Instruments | WSON-8 4x4mm |
| LM5008ASD/NOPB.A | Texas Instruments | WSON-8 4x4mm |
| LM5008ASD/NOPB.B | Texas Instruments | WSON-8 4x4mm |
| LM5008ASDX | Texas Instruments | WSON-8 4x4mm |
| LM5008ASDX/NOPB | Texas Instruments | WSON-8 4x4mm |
| LM5008ASDX/NOPB.A | Texas Instruments | WSON-8 4x4mm |
| LM5008ASDX/NOPB.B | Texas Instruments | WSON-8 4.0x4.0mm |
Other Switching Regulators (Buck)
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- TLV62568 – Texas Instruments, Synchronous Buck Converter
- LM2596 – Texas Instruments, Step-Down Voltage Regulator
- TPS562200 – Texas Instruments, Synchronous Buck Converter
- AP63203WU – Diodes Incorporated, Synchronous Buck Converter
- AP63357DV-7 – Diodes Incorporated, Synchronous Buck Converter
- LMR38010FDDAR – Texas Instruments, Synchronous Buck Converter
All Switching Regulators (Buck) datasheetsAll Texas Instruments datasheets (2,418)
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