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Key Inclusion Criteria:

* HIV-1 infected, virologically suppressed males and females age ≥ 4 weeks to \< 18 years (according to requirements of enrolling Cohort).
* Body weight at screening ≥ 25 to \< 40 kg (Cohort 2); ≥ 14 to \< 25 kg (Cohort 3); ≥ 3 to \< 25 kg (Cohort 4); ≥ 3 to \< 14 kg (Cohort 5).
* Stable antiretroviral (ARV) regimen for a minimum of 3 months prior to the screening visit.

  * Participants enrolled prior to implementation of Amendment 7: 2 nucleoside reverse transcriptase inhibitors (NRTIs) and ritonavir-boosted atazanavir (ATV/r) once daily or ritonavir-boosted darunavir (DRV/r) once daily or twice daily.
  * Participants enrolled after the implementation of Amendment 9:

    * Cohorts 2, 3 and 4 (Group 1): 2 NRTIs plus a third agent per local prescribing guidelines. Participants will switch from their current third agent to ATV or darunavir (DRV) at Day 1. Participants taking DRV must be on once-daily dosing or must switch to once daily at or prior to Day 1. Cohort 4 (Group 1), participants may also switch their current third agent to lopinavir boosted with ritonavir (LPV/r) at Day 1. Participants will switch their NRTI backbone to emtricitabine/tenofovir alafenamide (coformulated; Descovy®) (F/TAF).
    * Cohort 4 (Groups 2 to 4) and Cohort 5 (Groups 1 to 3): 2 NRTIs plus a third agent per local prescribing guidelines or treatment naive. Participants on treatment will switch from their current third agent to ATV or LPV/r (Cohort 4 (Groups 2 to 4)), or to a third unboosted agent (Cohort 5 (Groups 1 to 3)). Participants will switch their NRTI backbone to F/TAF.
* Participants undergoing dose modifications to their ARV regimen for growth or switching medication formulations are considered to be on a stable ARV regimen.
* Documented plasma human immunodeficiency virus type 1 (HIV-1) ribonucleic acid (RNA) for ≥ 3 months preceding the screening visit:

  * Participants enrolled after the implementation of Amendment 9:

    * For Cohorts 2, 3, and 4 (Group 1), virologically suppressed ≥ 3 months preceding the screening visit: HIV-1 RNA \< 50 copies/mL on a stable regimen (or undetectable HIV-1 RNA level according to the local assay being used if the limit of detection is ≥ 50 copies/mL).
    * For Cohorts 4 (Groups 2 to 4) and Cohort 5 (Groups 1 to 3), on an ARV regimen irrespective of plasma HIV-1 RNA copies or treatment naive; a participant is considered treatment naive, if ARVs were given for prevention of mother-to-child transmission but not for HIV treatment.
  * For virologically suppressed participants, unconfirmed virologic elevations of HIV-1 RNA ≥ 50 copies/mL (transient detectable viremia, or "blip") prior to screening are acceptable. If the lower limit of detection of the local HIV-1 RNA assay is \< 50 copies/mL (eg, \< 20 copies/mL), the plasma HIV-1 RNA level cannot exceed 50 copies/mL on 2 consecutive HIV-1 RNA tests.
* Adequate renal function: Estimated glomerular filtration rate (eGFR) ≥ 90 mL/min/1.73m2 using the Schwartz formula. If ≥ 1 year old, eGFR greater than or equal to the minimum normal value for age using the Schwartz formula. If \< 1 year old as follows:

  * Age minimum value for eGFR (mL/min/1.73 m2) \> 28 days to ≤ 95 days is 30, ≥ 96 days to ≤ 6 months is 39, \> 6 to \< 12 months is 49.
* Participants must not have documented or suspected resistance to applicable study drugs including emtricitabine (Emtriva®) (FTC), TFV, ATV, DRV, or LPV. Participants \< 14 kg (Cohorts 4 (Groups 2 to 4) and 5 (Groups 1 to 3)) with M184V/I AND HIV-1 RNA \< 50 copies/mL will be allowed.
* Positive confirmatory HIV test (confirmatory nucleic acid-based testing if \< 18 months of age).
* Cohort 4 (Groups 2 to 4) and Cohort 5 (Groups 1 to 3): Last dose of nevirapine or efavirenz, if applicable, ≥ 14 days prior to enrollment.

Note: Other protocol defined Inclusion/Exclusion criteria do apply.

• Long Beach, California, United States
• Los Angeles, California, United States
• Aurora, Colorado, United States
• Washington D.C., District of Columbia, United States
• Tampa, Florida, United States
• Memphis, Tennessee, United States
• Houston, Texas, United States
• Buenos Aires, Argentina
• Buenos Aires, Argentina
• Bloemfontein, South Africa
• Cape Town, South Africa
• Durban, South Africa
• Johannesburg, South Africa
• Pretoria, South Africa
• Soweto, South Africa
• Bangkok, Thailand
• Bangkok, Thailand
• Khon Kaen, Thailand
• Kampala, Uganda
• Kampala, Uganda
• Masaka, Uganda
• London, United Kingdom
• Harare, Zimbabwe