SLVSGM3B March   2023  – January 2024 TPS56836 , TPS56837 , TPS56838

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  The Adaptive On-Time Control and PWM Operation
      2. 6.3.2  Mode Selection
      3. 6.3.3  Soft Start and Pre-Biased Soft Start
      4. 6.3.4  Enable and Adjusting Undervoltage Lockout
      5. 6.3.5  Output Overcurrent Limit and Undervoltage Protection
      6. 6.3.6  Overvoltage Protection
      7. 6.3.7  UVLO Protection
      8. 6.3.8  Thermal Shutdown
      9. 6.3.9  Output Voltage Discharge
      10. 6.3.10 Power Good
      11. 6.3.11 Large Duty Operation
    4. 6.4 Device Functional Modes
      1. 6.4.1 Standby Operation
      2. 6.4.2 Eco-mode
      3. 6.4.3 Forced Continuous Conduction Mode
      4. 6.4.4 Out-of-Audio™ Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Custom Design With WEBENCH® Tools
        2. 7.2.2.2 Output Voltage Resistors Selection
        3. 7.2.2.3 Output Filter Selection
        4. 7.2.2.4 Input Capacitor Selection
        5. 7.2.2.5 Bootstrap Capacitor Selection
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Custom Design With WEBENCH® Tools
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5.5 Electrical Characteristics

The electrical ratings specified in this section apply to all specifications in this document unless otherwise noted. These specifications are interpreted as conditions that do not degrade the parametric or functional specifications of the device for the life of the product containing it. Typical values correspond to TJ = 25°C, VIN = 24V. Minimum and maximum limits are based on TJ = –40°C to +150°C, VIN = 4.5V to 28V (unless otherwise noted).
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
SUPPLY CURRENT
IQNonswitching Quiescent current(1)TJ = 25°C, VEN = 5V,

VFB = 0.65V, TPS56837

45

µA
TJ = 25°C, VEN = 5V,

VFB = 0.7V, TPS56838

370

ISHDNNShutdown supply currentTJ = 25°C, VEN = 0V3µA
UVLO
UVLOVIN undervoltage lockoutWake up VIN voltage4.04.24.4V
Shutdown VIN voltage3.53.653.8V
Hysteresis VIN voltage550mV
ENABLE(EN PIN)
IEN_PULLUPEN pullup currentVEN = 1.1V1µA
IEN_HYSHysteresis currentVEN = 1.3V

3

µA
VEN_ONEnable thresholdEN rising1.181.26V
VEN_OFFEN falling

1

1.07V
FEEDBACK VOLTAGE
VFBFeedback voltageVOUT = 5V, continuous mode operation, TJ = 25°C0.5940.60.606V
VOUT = 5V, continuous mode operation, TJ = –40°C to 150°C0.5910.60.609V
MOSFET
Rdson_HSHigh-side MOSFET on-resistanceTJ = 25°C, VBST – VSW = 5V

20.4

mΩ
Rdson_LSLow-side MOSFET on-resistanceTJ = 25°C

9.5

mΩ
CURRENT LIMIT
ILS_OCLLow-side MOSFET valley current limitILIM-1 option

6

7.2

8.5

A
ILIM option

8

9.6

11.1

IHS_OCLHigh-side MOSFET peak current limit

12.75

15

17.25

A

INOCL

Low-side MOSFET negative current limit

2.5

A

DUTY CYCLE and FREQUENCY CONTROL

FSWSwitching frequencyVIN = 24V, VOUT = 5V, continuous mode operation, Mode setting to 500kHz500kHz
tOOA

OOA period

TPS56836 OOA operation period

30

us

tON(MIN)Minimum on time(2)

50

ns
tOFF(MIN)Minimum off time(2)TJ = 25°C

150

ns
SOFT START
tSSInternal soft-start time1.8ms
ISSSoft-start charging current6uA
POWER GOOD
VPGTHPG lower threshold - falling% of VFB85%
PG lower threshold - rising% of VFB

90%

PG upper threshold - falling% of VFB110%
PG upper threshold - rising% of VFB

115%

IPGSINKPG sink currentVFB = 0.5V, VPG = 0.4V10

mA

tPG_DLYPG delayPG from low-to-high64us
PG from high-to-low32us
VOVPOutput OVP thresholdOVP detect125%
tOVP_DEGOVP propagation deglitchTJ = 25°C32us
VUVPOutput UVP thresholdHiccup detect65%
tUVP_WAITUV protection hiccup wait time256us
tUVP_HICCUPUV protection hiccup time before recovery10.5 × tSS

s

THERMAL SHUTDOWN
Thermal shutdown threshold(3)Temperature Rising

150

165°C
Hysteresis30°C
SW DISCHARGE RESISTANCE
VOUT discharge resistanceVEN = 0, VSW = 0.5V, TJ = 25°C200Ω
(1) Not representative of the total input current of the system when in regulation. Specified by design and characterization test.
(2) Not production tested. Specified by design.
(3) Not production tested. Specified by design and engineering sample correlation.