diff --git a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/TARGET_EP_ATLAS/atlas_init.c b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/TARGET_EP_ATLAS/atlas_init.c
new file mode 100644
index 0000000000..e539a5e6cf
--- /dev/null
+++ b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/TARGET_EP_ATLAS/atlas_init.c
@@ -0,0 +1,44 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2021 ARM Limited
+ * Copyright (c) 2021 Embedded Planet, Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+
+#include "subtarget_init.h"
+
+#include "nrf.h"
+
+/**
+ * Override the subtarget sdk init startup hook (specific to nRF2)
+ * This will configure the internal regulator to operate at 3.3V
+ */
+void subtarget_sdk_init(void) {
+
+    if (NRF_UICR->REGOUT0 != UICR_REGOUT0_VOUT_3V3)
+    {
+         NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
+         while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+         NRF_UICR->REGOUT0 = UICR_REGOUT0_VOUT_3V3;
+         NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
+         while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+
+         // Trigger a soft reset so that the settings take effect
+         NVIC_SystemReset();
+     }
+}
+
+