SNVSA85C October   2015  – January 2017 LM27761

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Undervoltage Lockout
      2. 7.3.2 Input Current Limit
      3. 7.3.3 PFM Operation
      4. 7.3.4 Output Discharge
      5. 7.3.5 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Enable Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application - Regulated Voltage Inverter
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Charge-Pump Voltage Inverter
        3. 8.2.2.3 Negative Low-Dropout Linear Regulator
        4. 8.2.2.4 Power Dissipation
        5. 8.2.2.5 Output Voltage Setting
        6. 8.2.2.6 External Capacitor Selection
          1. 8.2.2.6.1 Charge-Pump Output Capacitor
          2. 8.2.2.6.2 Input Capacitor
          3. 8.2.2.6.3 Flying Capacitor
          4. 8.2.2.6.4 LDO Output Capacitor
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

6.5 Electrical Characteristics

Typical limits apply for TA = 25°C, and minimum and maximum limits apply over the full temperature range. Unless otherwise specified, VIN = 5 V and values for C1 to C4 are as shown in the Typical Application.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
Iq Supply current Open circuit, no load 370 600 µA
ISD Shutdown supply current 7 12 µA
ƒSW Switching frequency VIN = 3.6 V 1.7 2 2.3 MHz
RNEG Output resistance to CPOUT VIN = 5.5 V 2 Ω
VDO LDO dropout voltage ILOAD = 100 mA, VOUT = −5 V 30 mV
PSRR Power supply rejection ratio ILOAD = 80 mA, VCPOUT = −5 V 35 dB
VN Output noise voltage ILOAD = 80 mA, 10 Hz to 100 kHz 20 µVRMS
VFB Feedback pin reference voltage 1.202 1.22 1.238 V
VOUT Adjustable output voltage 5.5 V ≥ VIN ≥ 2.7 V –5 –1.5 V
Load regulation 0 to 250 mA, VOUT = −1.8 V 4.6 µV/mA
Line regulation 5.5 V ≥ VIN ≥ 2.7 V, ILOAD = 50 mA 1.5 mV/V
VIH Enable pin input voltage high 5.5 V ≥ VIN ≥ 2.7 V 1.2 V
VIL Enable pin input voltage low 5.5 V ≥ VIN ≥ 2.7 V 0.4 V
UVLO Undervoltage lockout VIN falling 2.6 V
VIN rising 2.4