LM5118MHX/NOPB Complete Datasheet Summary

1. Basic Device Identification

• Full Part Number: LM5118MHX/NOPB
• Manufacturer: Texas Instruments
• Device Type: Wide Input Voltage Range Buck-Boost Controller
• Document: SNVS566J (April 2008 – Revised June 2017)
• Status: Active (Production)
• Package: 20-Pin HTSSOP (PWP) with Exposed PowerPAD™
• RoHS Compliant: Yes
• Moisture Sensitivity Level (MSL): Level 1, unlimited at 260°C
• Operating Junction Temperature: −40°C to 125°C
• Top Marking: LM5118 MH

2. Package & Physical Specifications

• Package Code: PWP (HTSSOP-20)
• Body Dimensions: 6.50 mm × 4.40 mm × 1.20 mm (max height)
• Lead Pitch: 0.65 mm
• Mounting Style: Surface Mount (SMT)
• Packaging: Large Tape-and-Reel
• Standard Quantity (SPQ): 2500 units per reel
• Reel Diameter: 330.0 mm
• Pin 1 Orientation: Quadrant Q1
• Thermal Resistance θJA: 40°C/W
• Thermal Resistance θJC(bottom): 4°C/W

3. Pin Configuration (HTSSOP-20, Top View)

1. VIN
2. UVLO
3. RT
4. EN
5. RAMP
6. AGND
7. SS
8. FB
9. COMP
10. VOUT
11. SYNC
12. CS
13. CSG
14. PGND
15. LO
16. VCC
17. VCCX
18. HB
19. HO
20. HS

• Exposed Pad (EP): Connect to GND plane

4. Pin Functions

5. Key Features

• Ultra-wide input voltage: 3 V to 75 V
• Emulated peak current-mode control
• Smooth buck-to-buck-boost mode transition
• Programmable switching frequency: 50 kHz to 500 kHz
• External synchronization capability
• Internal high-voltage bias regulator
• Integrated high-side and low-side gate drivers
• Programmable soft-start time
• Ultra-low shutdown current: <10 µA
• Precision enable input
• Wide-bandwidth error amplifier
• ±1.5% feedback voltage reference accuracy
• Thermal shutdown protection
• WEBENCH® Power Designer supported

6. Absolute Maximum Ratings

• VIN, EN, VOUT: −0.3 V to 76 V
• VCC, LO, VCCX, UVLO: −0.3 V to 15 V
• HB − HS: −0.3 V to 15 V
• HO − HS: −0.3 V to HB + 0.3 V
• HS − GND: −4 V to 76 V
• CS, CSG: −0.3 V to 0.3 V
• RAMP, SS, COMP, FB, SYNC, RT: −0.3 V to 7 V
• Junction Temperature: 150°C
• Storage Temperature: −55°C to 150°C
• ESD HBM: ±2000 V; CDM: ±1000 V

7. Recommended Operating Conditions

• Input Voltage (VIN): 3 V to 75 V (startup requires ≥5 V)
• VCC, VCCX: 4.75 V to 14 V
• Junction Temperature: −40°C to 125°C

8. Critical Electrical Characteristics

• Reference Voltage (FB): 1.23 V (±1.5%)
• VCC Regulation: 7.0 V typ; 5.25 V at VIN < 10 V
• Shutdown Supply Current: 1 µA typ, 10 µA max
• VCCX Switch Threshold: 3.85 V typ
• UVLO Threshold: 1.23 V typ
• Oscillator Frequency: 50 kHz – 500 kHz (resistor programmable)
• Current Limit Threshold:
• Peak Gate Drive Current: ±2.2 A source, up to 3.5 A sink
• Thermal Shutdown: 165°C typ
• Minimum HO On-Time: 70 ns typ
• Forced HO Off-Time: 400 ns typ

9. Functional Description

LM5118MHX/NOPB is a buck-boost controller that maintains stable output regulation whether input voltage is above, equal to, or below output voltage.

• Operates as buck regulator when VIN > VOUT
• Smoothly transitions to buck-boost mode as VIN approaches VOUT
• Uses emulated peak current-mode control for high noise immunity and small duty-cycle operation
• Integrated high-voltage bias regulator supports direct connection to 75 V inputs
• Includes cycle-by-cycle current limiting, 256-cycle hiccup fault protection, and thermal shutdown
• Exposed PowerPAD enhances thermal performance for high-power applications

10. Typical Applications

• Industrial wide-range buck-boost power supplies
• Automotive battery systems (cold-crank / start-stop)
• 24 V / 48 V industrial power systems
• Battery-powered equipment with wide input swings
• High-voltage step-up/step-down regulation

11. Design & Layout Guidelines

• Minimize area of high-current switching loops
• Separate AGND and PGND; connect at one point near IC
• Place input capacitors close to VIN and PGND
• Use thermal vias under exposed pad to GND plane
• Bootstrap capacitor (0.1–0.47 µF) close to HB–HS
• Use Schottky diodes for freewheeling and boost paths
• Kelvin connection for current-sense resistor

12. Ordering & Packaging Details

• Orderable Part: LM5118MHX/NOPB
• Package: 20-pin HTSSOP (PWP) with exposed pad
• Packaging: Large tape and reel
• Quantity: 2500 units
• Lead Finish: SN
• RoHS: Yes
• MSL: Level 1 (unlimited floor life)