diff --git a/include/libopencm3/stm32/common/adc_common_v2_multi.h b/include/libopencm3/stm32/common/adc_common_v2_multi.h
index 17f2c130..08203a8b 100644
--- a/include/libopencm3/stm32/common/adc_common_v2_multi.h
+++ b/include/libopencm3/stm32/common/adc_common_v2_multi.h
@@ -172,6 +172,8 @@ specific memorymap.h header before including this header file.*/
 BEGIN_DECLS
 
 void adc_set_sample_time(uint32_t adc, uint8_t channel, uint8_t time);
+void adc_enable_regulator(uint32_t adc);
+void adc_disable_regulator(uint32_t adc);
 
 END_DECLS
 
diff --git a/include/libopencm3/stm32/f3/adc.h b/include/libopencm3/stm32/f3/adc.h
index 862a1576..84056c88 100644
--- a/include/libopencm3/stm32/f3/adc.h
+++ b/include/libopencm3/stm32/f3/adc.h
@@ -544,8 +544,6 @@ void adc_enable_external_trigger_injected(uint32_t adc, uint32_t trigger,
 bool adc_awd(uint32_t adc);
 /*void adc_set_dma_continue(uint32_t adc);*/
 /*void adc_set_dma_terminate(uint32_t adc);*/
-void adc_enable_regulator(uint32_t adc);
-void adc_disable_regulator(uint32_t adc);
 
 END_DECLS
 
diff --git a/include/libopencm3/stm32/l4/adc.h b/include/libopencm3/stm32/l4/adc.h
index 1480c1c7..e01852fd 100644
--- a/include/libopencm3/stm32/l4/adc.h
+++ b/include/libopencm3/stm32/l4/adc.h
@@ -54,6 +54,15 @@
 #define ADC_CHANNEL_VBAT	18
 /**@}*/
 
+/* ADC_CR Values ------------------------------------------------------------*/
+
+/* DEEPPWD: Deep power down */
+#define ADC_CR_DEEPPWD		(1 << 29)
+
+/* ADVREGEN: Voltage regulator enable bit */
+#define ADC_CR_ADVREGEN		(1 << 28)
+
+
 /****************************************************************************/
 /* ADC_SMPRx ADC Sample Time Selection for Channels */
 /** @defgroup adc_sample ADC Sample Time Selection values
diff --git a/lib/stm32/l4/Makefile b/lib/stm32/l4/Makefile
index 0726cd75..f67c6db1 100644
--- a/lib/stm32/l4/Makefile
+++ b/lib/stm32/l4/Makefile
@@ -37,7 +37,7 @@ TGT_CFLAGS      += $(DEBUG_FLAGS)
 ARFLAGS		= rcs
 
 # Specific objs
-OBJS		= 
+OBJS		= adc.o
 
 # common/shared objs
 OBJS            += rcc_common_all.o
diff --git a/lib/stm32/l4/adc.c b/lib/stm32/l4/adc.c
new file mode 100644
index 00000000..3ea3350e
--- /dev/null
+++ b/lib/stm32/l4/adc.c
@@ -0,0 +1,58 @@
+/** @defgroup adc_file ADC
+
+@ingroup STM32L4xx
+
+@brief <b>libopencm3 STM32L4xx Analog to Digital Converters</b>
+
+@author @htmlonly &copy; @endhtmlonly 2016 Karl Palsson <karlp@tweak.net.au>
+
+
+LGPL License Terms @ref lgpl_license
+ */
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2016 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/adc.h>
+
+/**@{*/
+
+/**
+ * Enable the ADC Voltage regulator
+ * Before any use of the ADC, the ADC Voltage regulator must be enabled.
+ * You must wait up to 10uSecs afterwards before trying anything else.
+ * @param[in] adc ADC block register address base
+ * @sa adc_disable_regulator
+ */
+void adc_enable_regulator(uint32_t adc)
+{
+	ADC_CR(adc) |= ADC_CR_ADVREGEN;
+}
+
+/**
+ * Disable the ADC Voltage regulator
+ * You can disable the adc vreg when not in use to save power
+ * @param[in] adc ADC block register address base
+ * @sa adc_enable_regulator
+ */
+void adc_disable_regulator(uint32_t adc)
+{
+	ADC_CR(adc) &= ~ADC_CR_ADVREGEN;
+}
+
+/**@}*/
\ No newline at end of file