diff --git a/components/openthread/src/port/esp_openthread_sleep.c b/components/openthread/src/port/esp_openthread_sleep.c
index a5381625ca..8ca7504a6f 100644
--- a/components/openthread/src/port/esp_openthread_sleep.c
+++ b/components/openthread/src/port/esp_openthread_sleep.c
@@ -19,10 +19,12 @@ esp_err_t esp_openthread_sleep_init(void)
 {
     esp_err_t err = ESP_OK;
 
-    err = esp_pm_lock_create(ESP_PM_CPU_FREQ_MAX, 0, "ieee802154", &s_pm_lock);
+    // Here we use APB_MAX because modem requires MODEM_REQUIRED_MIN_APB_CLK_FREQ.
+    // No need for CPU_MAX to reduce current consumption during Rx window.
+    err = esp_pm_lock_create(ESP_PM_APB_FREQ_MAX, 0, "ot_sleep", &s_pm_lock);
     if (err == ESP_OK) {
         esp_pm_lock_acquire(s_pm_lock);
-        ESP_LOGI(TAG, "Enable ieee802154 light sleep, the wake up source is ESP timer");
+        ESP_LOGI(TAG, "Enable OpenThread light sleep, the wake up source is ESP timer");
     } else {
         if (s_pm_lock != NULL) {
             esp_pm_lock_delete(s_pm_lock);
diff --git a/examples/openthread/ot_sleepy_device/light_sleep/main/esp_ot_sleepy_device.c b/examples/openthread/ot_sleepy_device/light_sleep/main/esp_ot_sleepy_device.c
index a7600f9c9a..d4e1892273 100644
--- a/examples/openthread/ot_sleepy_device/light_sleep/main/esp_ot_sleepy_device.c
+++ b/examples/openthread/ot_sleepy_device/light_sleep/main/esp_ot_sleepy_device.c
@@ -25,6 +25,7 @@
 #include "esp_openthread_netif_glue.h"
 #include "esp_ot_sleepy_device_config.h"
 #include "esp_vfs_eventfd.h"
+#include "esp_private/esp_clk.h"
 #include "driver/uart.h"
 #include "nvs_flash.h"
 #include "openthread/logging.h"
@@ -192,7 +193,7 @@ static esp_err_t ot_power_save_init(void)
 
     esp_pm_config_t pm_config = {
         .max_freq_mhz = cur_cpu_freq_mhz,
-        .min_freq_mhz = cur_cpu_freq_mhz,
+        .min_freq_mhz = esp_clk_xtal_freq() / MHZ,
 #if CONFIG_FREERTOS_USE_TICKLESS_IDLE
         .light_sleep_enable = true
 #endif